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tim_mc · 01-17-2021, 11:17 AM

Just curious why you wouldn't want a 700R4 over a TH350/400. '84 and later versions have a better 30-spline input shaft and '87 and up versions are considered to be solid transmissions.

I swapped out my TH350 with a rebuilt later model '92 700R4 and love it. It has an earlier valve body with hydraulic lock-up kit for the converter, so no solenoid to power.

However, if you have a good TH400 in the shop and are OK with a 3 speed then I would use what you have.

01-17-2021, 11:17 AM	#8
tim_mc Registered User Join Date: Jan 2019 Location: St Peters, MO Posts: 434	Re: Thinking about swapping to auto trans: Just curious why you wouldn't want a 700R4 over a TH350/400. '84 and later versions have a better 30-spline input shaft and '87 and up versions are considered to be solid transmissions. I swapped out my TH350 with a rebuilt later model '92 700R4 and love it. It has an earlier valve body with hydraulic lock-up kit for the converter, so no solenoid to power. However, if you have a good TH400 in the shop and are OK with a 3 speed then I would use what you have. __________________ 1967 C20, 350 SBC w/Comp roller cam, 700R4 w/3.42 posi, PS, 4-wheel PDB, Old Air AC & GM Tilt column.