Something wrong...feels expensive.... Need help

[clinebarger]

Originally Posted by 86c20

yea that would be the hd 350 i think gm called them 375. but then what is the 200r4 based off of? i was always told 700 was a 400 200 was a 350. or at least base off of them

The HD version of a TH350 is called a TH375B, An extra friction in the Forward & Direct drum is the only difference worth mentioning. A light duty version called a TH250 also existed.

A TH375 is a light duty version of a TH400....Fewer clutches & 27 spline output. The HD version of the TH400 is a TH475/3L80-HD.

The 4L80E is based on a TH400.

The lower-end (Center support & down) of a 700R4 is the same as a TH350, The rest of the 700R4 is a "Clean sheet design". Though the front pump is a off shoot of a 2004R.

The 2004R is loosely based on the TH200, The Low/reverse, Direct, & Forward clutch assembles are a lot alike.