Thread: F4EAT trans Question (trannyman)

Did you air check all of the clutch packs when you put the trans back together? Did you flush the cooler out and make sure fluid flows through it ok? It sounds like your valve body was ok but I would definately go over that again. Also on not of the pressure stuff and the cable- thanks for mentioning your does not have the cable. Did you replace the solenoid in the trans that controls pressure? Did you check the band clearance? Is the apply piston ok and did it air check ok? I know there is some minor damage to the parts but you may want to stack things back together in the case and air check everything if you havent already tried this as this will aid in finding excessive leaks. Your pressure numbers looked good and arent way below what they should be and they often very a bit off of the specs so I agree with the fact that something has to be off inside and this is where air-checking each apply element will help.

I think I figured out my trans issue. I'll know tomorrow when I drop it back in the car. The transgo shift kit was a bit more in depth than the one for the 4t65e. Well they end up giving you all new checkballs for the valve body and they are all the same size so I ended up using them all since I ended up losing a few of mine. It turns out the size of the checkballs transgo includes in the kit are 1/4 in or (.250) while the oem one are .236. There is a note in the transgo kit that states you can use all their checkballs except the one for the bathtub. The bathtub in my valvebody is the Low/Reverse Shuttle ball. I think this is why it burned my Sun gear drum and damaged the one way outer clutch.

That would also explain why the car wouldn't creap forward when you took your foot off the brake.

Oh yeah I air checked all the clutch packs before I put the trans together, except for 3-4 which I don't own the adapter for. I replaced the EPC solenoid along with the Tcc solenoid. I could spin the sun gear drum with band applied so that checked out, they note that if you can't move it by hand you might have grind the pin a little.

Trango kit on this one recommended: drilling holes in the stator support, drilling accumulator plate, d-ring instead of accumulator teflon seals, then the usual diffferent springs,

Sounds like you are on the right track. If the Lo/Reverse clutch pack stay partially applied that would explain everything, including the partially burnt frictions since they were trying to hold when the should have been off which puts the trans in a bind. The Transgo kits for the 4T65E are about the most generic kit they offer and the easiest to install. They provide a few helpful tips and such but there isnt near the problems with these transmissions than what other transmissions have. I really feel the whole accumulator setup was just used over from the original Thrasher/Transgo kits and they slightly altered it and realized that it can be used in every day stock vehicles without bad side effects and helps shorten shifts which is one of the biggest problems on a stock 4T65E. Almost all of their other kits are pretty involving and in depth.

I put the trans in and finished just as the sun went down. While the car was jacked up in the air, I put the car in D and the wheels turned when I let off the brake so that was good. However that damn reverse I think might still be jacked up. I put the car in reverse, and the tires didn't spin when I let off the brake (didn't apply any gas). So I put the car back in park and turned off the engine. I had my brother and myself both grab a wheel and try to spin it in reverse and it didn't appear to move in the reverse direction. I said screw it and closed up for tonight.

I'm going to look at it tomorrow morning. I need to figure out what mechanically in this trans would prevent the car from spinning in the reverse direction. Would a tight 2-4 band on the sun gear prevent the trans from moving in reverse?

The 2-4 band (only band in trans), I was able to spin the sun gear drum by hand (I did put some trans fluid around the drum where the band meets it for ease of installation).