73-87chevytrucks.com

73-87 Chevy _ GMC Trucks => Engine/Drivetrain => Topic started by: achevy1978 on December 29, 2013, 09:42:52 pm

Title: rebuilding my th400 ??'s
Post by: achevy1978 on December 29, 2013, 09:42:52 pm
can this th400 pump be resurfaced to remove the scoring??
tried to post picture but only will do 256kb...
Title: Re: rebuilding my th400 ??'s
Post by: achevy1978 on January 08, 2014, 05:59:20 pm
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
Title: Re: rebuilding my th400 ??'s
Post by: Engineer on January 08, 2014, 07:30:03 pm
Find an older transmission that uses aluminum pistons.

The steel pistons are not desirable for HD usage.
Title: Re: rebuilding my th400 ??'s
Post by: achevy1978 on January 09, 2014, 08:14:10 pm
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
Title: Re: rebuilding my th400 ??'s
Post by: achevy1978 on January 11, 2014, 03:39:16 pm
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
Title: Re: rebuilding my th400 ??'s
Post by: bd on January 11, 2014, 06:00:41 pm
Various Resources: