Thread: TH400 Questions
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Old 05-22-2022, 11:42 AM   #13
ThreeQuarter
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Join Date: Jun 2000
Location: Texan in Iowa
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Re: TH400 Questions

What I saw in the pan was actually a little concerning to me. At 2500 miles after a rebuild I would normally expect to see a squeaky clean pan. But there was a considerable amount of black grime. And by the way the trans fluid beaded up you could tell there was water in the mix as well.

That said, the trans has functioned fine this entire time. I would not have suspected anything if I hadn’t pulled the slip yoke in the process of getting a new driveshaft built.
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'68 Chevy C10 Custom LWB 327/TH400 2nd owner
'16 GMC Sierra 1500 SLE Dblcab 4wd 5.3
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