rebuilding my th400 ??'s

[achevy1978]

can this th400 pump be resurfaced to remove the scoring??
tried to post picture but only will do 256kb...

[achevy1978]

hi guys
im am rebuilding (1st one) my th400. the forward and direct drums have the steel pistons with the spacers on top...if i wanted to add one or more frictions and steels to the 5 that are in there would i just take the 160 tho or so off the spacer?? is that how its done seeing the pistons can't be machined

thanks

[Engineer]

Find an older transmission that uses aluminum pistons.

The steel pistons are not desirable for HD usage.

[achevy1978]

mines a 78... when did they start with the steel pistons ?? would a motor home or bread truck of the 70's have the aluminum ones? what was the cut off year of al pistons....and how would i know if it had them without taking it apart?
thanks

[achevy1978]

im rebuilding my th400 and wanted to get VESPEL and TEFLON RINGS
but they are listed for a 4l80e... are they the same as a th400?? will the center support,
pump and servo's all be the same rings


thanks

[bd]

Various Resources:

• ATSG 400 Manual - a Must!  Also available through Summit Racing, et al.
  
  
• How to Rebuild and Modify GM Turbo 400 Transmissions by Cliff Ruggles - an excellent reference!
  
  
• How to Build a High Performance TH400 DVD - moving pictures...   
  
  
• Sonnax - problem solver upgrades
  
  
• Transtar Industries - parts and references
  
  
• ATI Center Supports