TH350 & TH400 converters the same? - Chevelle Tech
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Transmission & Driveline Transmissions and Differentials

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Old Jan 21st, 10, 8:18 AM
LS2Monte LS2Monte is offline
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Join Date: Dec 2008
Location: Cape Cod, MA
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Default TH350 & TH400 converters the same?

Are TH350 and TH400 all interchangeable? I've done it in the past and almost all aftermarket converters are listed for both.

I'm asking because I bought a TCI towing converter for my truck with a TH400. I had to order the one for the TH350 (seperate one listed for TH400) because I needed the smaller torque converter bolt circle. Since install I've had a slight whine from the front pump/converter at idle, in gear, once the truck gets warm. We had the pump apart a few months before that to replace the seal and front pump bushing. I had no noise after that until I swapped converters.

Anyways, in the spring, I want to send the converter back to TCI for a rebuild if I can indeed use it. I'll inspect the pump at the same time but do not feel its the pump.

Thoughts? Only want to do this once...R&R'ing a TH400 w/ NP208 hangin off the back is no fun on the ground! lol
'88SS-6.0 LQ4, Victor Jr EFI, 42lb SVO, 1000CFM 4bbl TB, MS II, MSD 6010, Comp 216/226 112, 1 3/4" long tubes, 4000 Stall, 2004r, 8.5" 4.56
'83SS-454, 10-1, ZZ502 roller cam, 1.8 roller rockers, 2.19/1.88 oval ports, Performer intake, 750 Holley Vac Sec, 2004r, 3.73 Posi
'99 Dodge CTD-4WD, 47RE, extended cab, 4in turboback, BHAF
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Chevelle Tech > Mechanical > Transmission & Driveline      Current Topic: TH350 & TH400 converters the same?
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