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10-19-2009, 11:46 PM
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Senior Member
 
Join Date: Jul 2000
Location: North Texas
Posts: 3,599
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2004R trans with 3.08 axle
I'm looking at replacing my 69 C-10's TH350 with a 2004R. A guy at Phoenix Transmission said the highway RPMs would be too low in OD/lock-up with my 3.08 gears. Is anyone here running that combo? The engine is a mild 355. Tire height is 28.5".
I'm in the process of installing an Auburn posi, so now would be a good time to get 3.42 gears if they would work better. Only problem is I'd be committed to buying the OD trans once I installed those gears! The budget option is to keep the TH350 and go with 2.76 gears. That would drop highway RPMs by 10%, but low gear might be a little too tall for some situations.
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Mike 1969 C10 LWB -- owned for 35 years. 350/TH350, 3.08 posi, 1st Gen Vintage Air, recent 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 24 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; 10-19-2009 at 11:49 PM. |
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