TH200

[olds307 and 403]

As said, change the input and output seals and whatever other seals it looks like. In a shop is different, you don't want a come back. We pulled at least one that shifted fine but had multiple leaks. My boss figured a known and tested used TH350 was a better gamble then resealing a TH200.

 

[hangar401]

Output seals changed trans and converter flushed all is good

 

[olskool]

the first thing most people think when they get a front transmission leak is front seal, the first thing i think is front pump bussing. the front seals do leak but most of the time it is the bushing. also on the 200-350 the pump O ring will leak. any time i resealed a pump i did all three. the 350 came out in 1969 and the 200 came out in 76, being a professional transmission rebuilder for 45 years i have built many 100s or even more of that flavor and everything else in between,,,,,,,,,,,,,,,,,

 

[olds307 and 403]

Yeah, you are right, new seals usually do squat. These old GM trans like to leak everywhere.