Thanks Vince the failure was the lip seal in direct drum on piston was torn in few places,,I'm concerned that maybe somethin caused it to blow,,prob tore on install tho. Trans was just rebuilt before I bought truck.

 

Hey another note to this,,direct has wave plate,,and forward has curved plate,,if I put curved in direct it tightens it up to where I need to be as to the rule of thumb of 10 per clutch. Maybe outta order one for direct,,but my year calls for waves

 

The seal was probably torn because the piston traveled out of its bore due to the fact that the clutches were smoked! Basically as the clutches wore out the clutch clearance was greatly increased and the piston traveled further than it was designed to do. In most cases this is why the seal was damaged not that it was damaged on the original install. Just a thought.

The curved plate is what I would call a dished plate. These plates are only used with an aluminum piston with a single apply surface. I would recommend not using this type of piston because they were known to crack. Also if you use a dished plate with the bonded piston it will get trapped in machined groove in the lower part of the drum. Take a look it and you will see what I'm talking about here. If you would like to take some pic's of what you have and post them here I will let you know what you have for sure. I would stick with the steel bonded pistons with the factory style wave plates for both drums.

 

K thanks. That makes sense, now gotta figure out why direct clutches fried,causing the lip seal to tear. Fun fun.

 

Vince,, it seems to me that maybe I have mis matched parts , forward drum had old aluminum piston that u can change seals on, a curved plate ,, I put wave in with steel piston and can't get snap ring in,,to tall,, now direct is opposite had the steel piston in it,,I put new steel one in, new wave and its loose which maybe fried clutches. Are the drums diff over years.

 

Or the top plate

 

The forward drum uses the .077 steels. If you have the .090's in there then this is why its to tight.The 80e's I'm pretty sure all direct drums will work with the bonded piston. I'm pretty sure that they are all pretty much the same from what I remember.

 

K. Tks. I got the thick steels in direct and thins in forward. Really not adding up here lol.

 

Is it possible that you have the pressure plates swapped between the two drums? You would not be able to assemble the drums in the trans this way but on the bench it could be misleading. Just a thought. Here is a link to the breakdown of the 80 on wits site. If nothing less use it for a quick reference!!!

https://www.wittrans.com/Schematic.a...0E&Schematic=3

 

Don't think so, forward press plate has the cogs on , and looks correct according to book I have. It's gotta be somethin stupid I'm doing wrong like that wrong somethin