Th400 cracked bellhousing rattling

But it wont shift when in drive or when i select the gears manually and ive confirmed the linkage is not the issue. Although most vehicle transmission noises relate to internal parts and cannot be seen, their behavior and sound frequency always deal with a moving part according to engine rpm or pressure. Humming noises are usually an indication of a bad bearing. Jun 16, 2008 ok guys, im digging up an older thread, so i need some help. It was a bit of work to cutoff the stock th400 bellhousing, but not too difficult. Follow the service procedure steps to correct the condition. Random rattling noise from bellhousing area page 2 the.

If you are sure the noise is coming from your gear box and happens even in neutral, then the output shaft bearing in your transmission may be starting to go bad. The converter drive hub will also usually have damage and can be cracked. Bellhousing numbers on th400, what they mean chevy. Aftermarket building techniques take it well past that figure. Mounted to my th400 transmission and lined right up with the holes on the crossmember of my 1976. These cracks are usually located where the main part of the case starts to. A cracked bell housing is caused by worn transmission andor engine mounts causing excessive vibration or movement which eventually will cause the bell housing to crack. This bellhousing is certainly a stronger improvement and has sfi rating.

Air gap is the clearance between the clutch disc, flywheel, and pressure plate with. How to repair a th400 transmission with a cracked bellhousing. The th400 core will go out for a full rebuild and installation in a future project, but in the interim, an ati street rod transmission and converter package will do the job, and add increased. Our stage 2 th400 includes all the components in the stage 1 rebuild but is upgraded to a 34 element sprag and the corresponding direct drum, 6 clutch direct with carbon based frictions, 4 clutch intermediate, manualautomatic valve body or forward pattern full manual upon request. Random rattling noise from bellhousing area the truck stop. The th400 9 inch tail housing with the 27 spline output shaft has the same. I have a 1966 impala ss with a 327 and th400 auto transmission. Its cable speedo, vacuum modulated, non torque converter lock up, electric kick down. How to repair the kickdown switch in a turbo 400 transmission aug 17, 2011 brian lohnes bangshift news 1 nearly every automatic transmission has some kind of kick down apparatus and they are all different.

We did encounter one problem with our turbo 400 case and that was a cracked bellhousing, which was repaired by hot rods by dean before it went to hughes. Bellhousing cracked all the way around, driveshaft then exploded in the middle. You will have to lovingly massage the floor pan with a 8lb mall because the bell housing and body of a th400 is slightly larger than the 700. These strongerthanstock housings bolt to the front pump and fit underneath stock floors. Pretty straight forward install just take your time. You dont have to put alot into a th400 to handle 500 hp. The problem turned out to be a cracked flex plate which. Using a sophisticated renishaw probing system the center of the pump bushing bore location in the pump body is located and recorded.

Almost sounds like a rod knock, or perhaps a loose torque converter nut hitting the bellhousing or something. While a cracked housing may put an end to your day on the trail, it certainly will not put an end to your transmission case. To correct the condition, follow the service procedure steps to replace the flexplate, transmission fluid pump, and torque converter. I wouldnt say that its common for turbo hydramatic 400s to crack in the bellhousing area as there are millions of them in service, many behind very high horsepower engines, offroad vehicles, etc. A th400 doesnt consume anymore hp than a th350 in a rockcrawler application and is a better unit to start with. Ford 460 bellhousing bellhousings astro performance. Performance has come up with these ultra bell bellhousings. The torque converter used with an automatic transmission acts like a flywheel. I ended up putting in dextron 3 and filled it a little more than required. Transmissions are all black magic to me, auto and manual.

You will also need to cut off the side ears, youll know them when you see them, for clearance. All of these have a high pitched rattle that i cant stand, but there are ways to get around it. When cold you can hear it in park, in drive or reverse, worst on cold start. Dynamic builds the very best racing transmissions anywhere. I know they have a different bolt pattern for the different bellhousings styles on the different enginesbut i have found that the th400 for the chevys cost alot more than the bops. Before i knew what it was, it would come and go but started sounding worse the last few days. I was out towing with the subruban last night, everything went great. This is important as the results of this test can vary with a different block or bellhousing. Im gonna take a stab at this, correct me as needed. Developed to eliminate all weak points found in the original gm transmission cases, the rugged ati supercase and bell housing are sfi approved.

We have been adding products as we have the chance to. I also noticed that the car will clunk when it shifts into gear, and from first to second, and second to third. Th400 with dana 20 rear output cracked adapter jeep used. Performance transmissions 92451 ultrabell for th400. I had a cracked th400 case about 6 inches forward of the tail end of the trans case tail end. The 390 has the ring gear attached to the torque converter, whereas the engines using the th400 utilise a normal flexplate. The new cast aluminum t400 supercase is the result of over 2 years of development. While a cracked housing may put an end to your day on the trail, it. It launched good and i got told last time i had a tranny leak. What makes this bellhousing so unique is that it is part of the performance automatic pro fit system. I replaced my broken stock transmission mount with this one. I have a 3500rpm stall converter and the car ran slow. The noise only happens at idle speed, as soon as you touch the accelerator it goes.

Ive got a almost tinny rattle seemingly from the bell housing area of the transmission. Jul 24, 20 th400 trans has a rattling noise sounding like a very loud heat shield rattling with viberation. Chevy turbo 400 automatic transmission information it still. This bellhousing is cnc machined to accept the 157 or 164 tooth flexplates and starters thus eliminating any guesswork for the retailer and end user. That said, a th350 is a pretty stout trans with some minor mods.

Does some one make and bushing to fit the chevy converter on one side and the pilot hole of the big block ford crank on the other side. The first in this series was the pro fit small block ford pa26577. Please excuse us while were in the process of building our new web store. Test the bellhousing for runout on both its bore and face as described in the troubleshooting section. Th400 performance transmissions and parts from patc.

Ive had stock bellhousing th400s behind 1500 hp, no issues. Have you ever heard a knock or a rattle sound coming from under your bellhousing. On the way home i stopped at a traffic light and noticed an unusual dull sounding rattling noise coming from the firewallfloorengine area. It would be safe to drive it home or to a repair shop, but i would have it replaced asap.

Th400 transmission troubleshooting help, th400 rebuilding. I had to pull some idiot out of a big hole out offroading last night, and on the way home my transmission wasnt shifting right. Its almost cracked all the way around about 75% of the bellhousing and its cracked all the way through. A vital part of an automobile engine equipped with automatic transmission. In the world of drag racing, cracked factory bellhousings are a welldocumented problem and aftermarket solutions are plentiful. When i was installing this transmission on my 1981 pontiac trans am, i busted the bell housing. Th400 bellhousing breaking2004 gto turbo ls1 youtube.

The concept of using a transbrake is to produce the fastest possible acceleration from a standing start. The turbohydramatic 400 th400 automatic transmission can be found behind large, powerful engines on chevrolet and gm cars and trucks from the factory, as well as jeep, cadillac, oldsmobile and many others. The flexplate has cracked twice in the past 6 months. A transbrake is activated by a drivercontrolled switch that connects to a solenoid mounted on the transmission. This is what it sounds like when your bellhousing on a th400 cant take 650 hp anymore lol. Where over 30 years building racing transmissions gives you the winning edge. The off brand planet gears are made of weak steel and crack like glass. Signs and sounds of transmission issues bluedevil products. Often, broken engine or transmission mounts are the contributing factor to th400 bellhousing cracks.

Ls bell housing heres an install video for a ultra bell housing. Th400 sfi bellhousing dynamic racing transmissions. It is widely regarded to be a supremely durable and legendary transmission. Ford bellhousing adapters th400 transmission type free. This cracked cause the convertor bolts backed out, and one of them got pinched inbetween the bellhousing and the convertor and hence the crack. The th400 also suffers from the same problem, but doesnt break until the 800 hp mark. When our th400 bellhousing opened up, grand canyonstyle, we ordered up a j. If the bell bolts loosen off, the housing will crack. Ive seen a few th350 cases cracked in the bellhousing area. Our stage 2 th400 includes all the components in the stage 1 rebuild but is upgraded to a 34 element sprag and the corresponding direct drum, 6 clutch direct with carbon based frictions, 4 clutch intermediate, manualautomatic valve body or. I ran over a curb in my 08 chevy cobalt and cracked the transmission casing. I run a np205 transfer case now with a fixed yoke after the weld repair.

Jmo ive heard of people putting that to a stock th400. How to troubleshoot a turbohydramatic 400 transmission it. Looking for a big block ford 429 and ford 460 bellhousing. The second one was a slow torture test because the pump slowly failed over a couple miles. Rattling noise comes from transmission when in gear and. Blazer, because when they get old it will rattle when the torque converter locks up. Temporarily install the bellhousing to be used on the block it will be used with. This allows the adapter plate to share the pump bushing bore as a centerline,and not the pump bolt holes drilled in the pump. You see, firstly, the bellhousing on the 390 is round, and the later cadillac is oddshaped next, the starter on the 390 bolts to the bellhousing, whereas the starter for the th400 bolts up to the block. A th350 does have a somewhat weaker bellhousing the a th400, but breakage is usually due to bad mounting in either case. It will do it at idle in park, at idle in drive or reverse but usually above 1100rpm it goes away while driving until you reach around 2000rpm then it rattles again.

They appear to have to be either 716 diameter and 12 long or 12 diameter and 12 long. Whether you need th400 wiring diagram information, th400 transmission rebuilders tips, th400 technical information, th400 diagnostics, th400 troubleshooting help, or just answers to your th400 transmission rebuilders question, the transmission rebuilders network is the place to go. Just bought the car in mid january, my first hot rod in quite a few years, had it trailered home and ive only driven it once. The bellhousing is cracked from the opening for the fork downward to the bottom center of the bh.

What could cause a crack in the bellhousing in a th30 auto. This may be due to a flexplate crack around the crankshaft. Letting the trans hang fron 1 or 2 bolts while installing can also cause it. The novak guide to the gm th400 automatic transmission. Just like with a dodge transmission, once power gets past 100150 rwhp over stock, the. Another thing that weakens them is if theyve been pulled to mate with the engine by using the attachment bolts. The case, bellhousing, and tailhousing are cast from 356t6 cast aluminum.

A solid trans mount with any motor mount configuration can and will cause cracked bellhousings. The th400 short tail and your trans are the same length. I can actually wiggle the drivers side of the housing back and forth. Other worn vehicle parts can mimic the noise or feel of faulty transmission parts, so. I found rotten jellied mounts under the adapter and that probably contributed to excess. Chevrolet silverado 1500 questions loud knocking noise 5.

On this website you will find many performance heavy duty transmission parts the others dont sell. Transmission brakes transbrakes have been available for the th400 for decades. Transmission ultra bell from summit racing equipment, broke out the cutoff wheel, and promptly made a mess on the garage floor. This unique bellhousing is cast from a high strength aluminum alloy and is sfi 30. I have the same kind of knocking noise but i know what the problem is. Ford th400 no bellhousings free shipping on orders. Beattie went on to tell us that the sprag for second gear is also less than bulletproof, and will fail above 400 hp in the th350. Hy busterswt, ive never done this job before but here goes with some suggestions which may help, t. Solution this problem could be caused by a cracked or split transmission filter.

Jan 05, 2011 chevy engineering faults and th400 vs c6 bellhousing. Both of mine started to crack at the little contoured area opened up for the starter. Robertthanks for your question about the humming noise in your transmission. In the turbo hydromatics category, we have several th400 versions to choose from. Chevys turbo hydramatic 400 th400 transmission is one of those legendary pieces of equipment that helped to define the musclecar generation, and it continues to be one of the most common and highly regarded transmissions in todays enthusiast market. I had the dust cover removed, and it was just unfortunate that it had to get wedged and form the crack. Upgrading the turbo 400 in your corvette super chevy. The factory stator can develop hairline cracks even at lower. Well today my friend called me and wanted me to pull him out he was stuck in the mud so i go over and try to pull him out it wasnt working so i snatched him and finally got him out later once i started driving down the road i heard a rattling noise pulled over to take a look and my transmission bell housing is cracked all the way around anyone know where i can get another one and why it. I had a 14 diameter 168 tooth flexplate and it would not clear the ultrabell. Ive got a th400 thats not shifting out of first even up to about 40 mph.

The surface should be smooth and free of burned spots and surface cracks. Ultra bells are manufactured from onepiece cast aluminum, making them 5 times stronger than stock bellhousings. They are tough as nails certified flexplate shields and allow for special motor and transmission combinations to be easily mated together. This information is for the nontransmission mechanic to help identify problem, know. Mine cracked all the way around and was dumping atf all over. While the unit is indeed one of the stoutest of its kind, trouble can still occur.

There might be a chance of the bellhousing hitting the floor. This trans is a mix of a late 60s to early 70s th400 from a jeep commando. We show you how to rebuild gms turbo 400 transmission specific to. Im having trouble with my th400, roughly the same issues described by scallop. Help removing th400 emergency brake the stovebolt forums.

Flywheel and flexplate dust covers th400 transmission. Installing an ati th400 in our c10 project hot rod. Jun 09, 2009 its almost cracked all the way around about 75% of the bellhousing and its cracked all the way through. Descriptions of the sound include clanking, chirping and a light knocking.

Camaro flywheel dust cover, th350 or th400, 19671981. Unfollow th400 trans brake to stop getting updates on your ebay feed. Camaro shifter boot, manual transmission, all, for cars with console. Th400 transmissions bte racing is a leader when it comes to high performance transmissions, including powerglides and street transmissions. Today is a great day to visit our store and order the parts you. For almost a decade, performance automatic has produced an incredibly versatile line of pro fit bellhousings. Part 17 how to align the bellhousing using offset dowel pins for the big block. The bellhousing on the th400 is a bit on the thin side and prone to failure. All i have done so far is pull the governor out, and it looks great not that i know what im looking for. The th400 is an automatic shift, threespeed, longitudinally positioned transmission.

I have a 1978 amc 304 that i want to bolt up to a tf999. A powerglide, th350, or stock th400 may be full with 910 qts on a fresh install, or in some cases it may take 15 qts. Sep 14, 20 ive got an 89 v2500 burb with a 350, th400, np241 combo. One adapter is cracked off and needs to be welded back on. Then a precision register is milled into the pump body that is concentric to that location. Cracked a th400 case and support brackets with a np205. You need to clean the case well enough to locate any cracks prior to assembly. Discussion in the hokey ass message board started by. With the clutch disc and pressure plate installed and ready, and the transmission bolted to its bellhousing, insert the release fork in its proper orientation if not fully symmetrical into the bellhousing, over the transmission bearing retainer snout and then snap on the retention spring if applicable. Climbed under the car and found the crack in the bellhousing. Designed inhouse at ati, and cast here in the usa, and machined at ati on 4axis horizontal cnc machines, the t400 supercase features improved fluid pathways to assure better performance and will accept any of atis sfi bellhousings, along with the reid bell with slight modifications and browell cans. About 5 days later i was driving not hard and came to stop and when i wanted to go it was not moving till i gave it more. Chevy engineering faults and th400 vs c6 bellhousing. Would a faulty torque converter cause this problem.