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Re: overdrive opinion
HO455 -- I'm now wondering if a TH350C would be an inexpensive alternative to a OD trans or GV unit. My 69 C10 with TH350 slips around 200-300 RPM on the highway (depending on engine load) with a Hughes GM11TOW converter.
It would give me the equivalent of a .80 -.90 OD, meaning a 3.08 axle would effectively become 2.46-2.77. I'd probably only engage it above 65 mph.
Gotta do some research on this!
*** Just spoke with a guy at Phoenix Transmissions. They have 4 different TH350s to choose from and they can build any of them as a C model. Even their entry level trans is a step up from stock. That one would work great, because the truck has been running a stock one, except for a TransGo kit, for 30+ years, with nothing but fluid/filter changes and new seals.
The lock-up converter stall speeds are 1600 to 3500. I could probably be all-in for less than $2K and not have to relocate the crossmember or shorten the driveshaft. And my 3.08 axle will work just fine.
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Mike
1969 C10 LWB -- owned for 34 years. 350/TH350, 3.08 posi, 1st Gen Vintage Air, AAW wiring harness, 5-lug conversion, 1985 spindles and brakes.
1982 C10 SWB -- sold
1981 C10 Silverado LWB -- sold, but wish I still had it!
1969 C10 (not the current one) that I bought in the early 1980s. Paid $1200; sold for $1500 a few years later. Just a hint at the appreciation that was coming.
Retired as a factory automation products salesman.
Worked part-time over the years for an engine builder and a classic car repair shop.
Member here for 23 years! This is the very first car/truck Internet forum I joined. I still used a dial-up modem back then!
Last edited by MikeB; 03-30-2021 at 05:15 PM.
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