![]() Someone please tell me what trans this is. pull the pan, and if the fluid is dark, smells "burnt" (you will know) or clutch, metal, (looks like fine metal flake paint) better to tear it down and inspect. 1.1 Shift shaft seal replace 1.2 Main case bushing replacement 1.3 Rear planetary setup 1.4 Center support assembly 1.5 Sprag design comparison 1.6 Spiro loc retainer 1.7 Direct drum modification 1.8 Clutch pack clearances 1.9 Full manual shift modifications 1.10 Boost valve modification 2 Valve body. It is NOT a 70 trans based on the tag date and is definately a Chevrolet trans. If it starts slipping, running it low on fluid, etc. If you ever have any issues, or too hot, then pull the pan and inspect the fluid, and service it. (if you can afford to make that much power, you can afford to build the transmission to handle that power). It takes a lot to kill a case, and more of that is from frame flex, (soft/rotted frame, bad body bushings), bad engine/trans mounts, bad pinion angle, drive shaft too long and the yoke jammed into the rear of the case, stuff like that. Heat, correct pressure, clean fluid, proper capacity, not letting off a second gear burnout, no neutral drops, no "J" hooks, no shifting into neutral at high road speed, and service according to the way you drive it. Completely Rebuilt TH400 Transmission 450HP New seals and clutches throughoutNew high energy bandCyclone F-2 Shift KitRecalibrated Front PumpComplete. The trans was swapped for a TCI competition trans and the old turbo 400 went into a beater that was used to haul parts and run around town a little, and that trans still works in that car till this day, with only third gear slipping, 1-2 shift is still strong, and holds first and second gear well. When the trans was cold it still ran like a race horse. I have personally seen a stock TH400 handle over 1000 horsepower on a dyno for two days of tuning (alot of hard acceleration) and hold up, then used on the streets for about a month with a heavy right foot before it started seeing a problem holding third during moderate acceleration on the highway, when hot. Aftermarket building techniques take it well past that figure. The TH400 is conservatively rated at 450 ft. in drive, 95-150 in reverse and 55-70 in neutral. My first stab would be to hook up a pressure gauge to the tap on the side of the trans. If you have a converter issue, it should still move. It is widely regarded to be a supremely durable and legendary transmission. A 400 uses different clutch packs for forward and reverse engagement, so a clutch problem is unlikely. JW Performance Competition TH400 Transmissions were originally released in 1964 and are an ideal racing automatic transmission for Hot Rods to Pro-Mods. THIS GASKET WILL FIT THE NERAT TH400 STEEL TAILSHAFT HOUSINGS AND THE TH400 OEM STOCK TAILSHAFT HOUSINGS. The TH400 is an automatic shift, three-speed, longitudinally positioned transmission. TH400 TAILSHAFT HOUSING GASKET REPLACEMENT. They are JEEP drivetrain specialists who manufactures adapters to use TH400 in JEEPS. = 2.556 inches between the inside surfaces where the "C" clips lock in the u-joint.I Came across this article on Novak's website. We designed this yoke to solve this problem over 30 years ago when T400 Truck Transmissions first started to be used in cars This dimension will be the correct center to center required for your driveshaft to fit correctly using this slip yoke. Now measure from center of u-joint hole in slip yoke to the center of the u-joint at the rear end yoke. Push the slip yoke all the way into transmission and pull it out 3/4 inch minimum to 1 inch maximum.To determine correct driveshaft center to center length for this slip yoke Removing the O-Ring will to allow the lubrication to get to the splines.and this is very important.We strongly suggest that you remove the O-Ring on the output shaft because with this slip yoke it is no longer necessary.This slip yoke will slide all the way into the transmission. With this counterbored slip yoke you can now use a normal car style driveshaft. This design will replace the truck style bolt on yoke with a car style slip yoke and allow for proper slip travel and bushing contact for best performance. > Please consult a transmission rebuilder to see what is required to convert it to a normal light truck tailshaft and tailshaft housing. T400/475 with the emergency brake and or roller bearing in the tailshaft housing as found in the RV Motor Home Transmission and Medium Truck Transmissions GM 3R Series 32 spline T-400, 4L80, 4L85 and 6L80 Transmission Slip yoke specifically designed to be used on a T-400, 4L80, 4L85, 6L80 with the Threaded Hole in the center of the Output shaft.ĭOES NOT FIT. UNIVERSAL JOINTS - Car and Light Truck.SPLINES - Center Brg Bolt On Yoke Style.BEARINGS - Sets - Cups - Cones - Needle.
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