Hey guys i'm having trouble and i am very confused about this transmission. I cannot find a rear output shaft seal for this 400. the transmission is out of an 86 c10. i've gone to napa, o'reilly and autozone and every rear seal they give me is just barely to big to fit. Whats going on here? I know for a fact this transmission is a 400. Are there any other transmissions that have tail shaft housings that are interchangable with the 400?
2 different seal can be in your 400. If your slip yoke has a 1.875 seal surface use a National# 9449. If the seal surface is 1.687 use National# 7038SA.
i will post the numbers and the diameter of the seal within the next couple hours. its for sure a 400 judging from the pan shape and length of the case.
i will post the numbers and the diameter of the seal within the next couple hours. its for sure a 400 judging from the pan shape and length of the case.
Check the Spline count on the Output Shaft. Is it 32-spline or 27-spline?
TH400 has 32-spline count, TH375 has smaller TH350 size 27-spline count and a TH400 pan shape, the bushing is smaller on the TH375. It will have a 9-1/2" tailhousing also.
"" A medium duty version of the TH-400. On the underside of the trans, right where the tail housing bolts up, the letters "TH-375" can usually be found cast into the trans housing.""
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