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Author Topic: rebuilding my th400 ??'s  (Read 2798 times)

Offline achevy1978

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rebuilding my th400 ??'s
« 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...
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Offline achevy1978

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Re: rebuilding my th400 ??'s
« Reply #1 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
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Offline Engineer

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Re: rebuilding my th400 ??'s
« Reply #2 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.
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Offline achevy1978

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Re: rebuilding my th400 ??'s
« Reply #3 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
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Offline achevy1978

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Re: rebuilding my th400 ??'s
« Reply #4 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
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Offline bd

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Re: rebuilding my th400 ??'s
« Reply #5 on: January 11, 2014, 06:00:41 pm »
Various Resources:
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Rich
It's difficult to know just how much you don't know until you know it.
In other words... if people learn by making mistakes, by now I should know just about everything!!!
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