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Re: 65 C10 Swapped 3 on the Tree to TH400 - Gearing
Quote:
Originally Posted by 65Oldred
Hello,
Awhile back we dropped in a "new" V8. While we had the truck apart, we replaced the 3 speed because it appeared to be shot (and it was) with a rebuilt TH400.
The gearing must be off. It drives like it could pull out a tree stump but seems constrained at highway speeds. (I believe the truck has the original rear end.)
Is the combination of a TH400 and gearing in the differential a problem?
Would going to a TH350 or 700R4 solve this problem?
Thanks.
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There's no difference in final drive gearing between the original 3spd manual trans & a TH400 since they're both 1:1 final drive ratio. You either need an OD transmission or to re-gear the rear-end to change the rpms @ highway speeds.
The OD transmission provides better gearing from a standing start & @ highway speeds vs just re-gearing. The OD trans swap also requires more financial investment.
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