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12-01-2021, 07:32 AM
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#1 |
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Registered User
Join Date: Dec 2016
Location: South Australia
Posts: 40
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Re: Rear end help needed please...
Rich, You are correct. It is a 3.07 rear not 3.08...my bad.
And thanks...my truck is still a work in progress but getting close. My tip is that you use an engine rpm calculator...it will be your friend. I just did this with your setup....3.07 rear, 28" wheels at 65mph . With a 3 speed auto your engine will be doing 2459rpm. T700 4sp auto the engine is spinning at 1721rpm....much nicer, but at a cost in time, effort and bux to install a T700. The economical way of achieving lower rpm's at highway speed would be to fit taller tyres. I would not worry about a posi as that will not affect engine speed, just traction to both wheels esp at take off. Just some food for thought... |
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12-01-2021, 11:50 AM
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#2 | |
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Senior Member
 
Join Date: Jul 2000
Location: North Texas
Posts: 3,672
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Re: Rear end help needed please...
Quote:
__________________
Mike 1969 C10 LWB -- owned for 36 years. 350/TH350, 3.08 posi, 1st Gen Vintage Air, recent AAW wiring harness, 5-lug conversion, 1985 spindles and brakes. 1982 C10 SWB -- converted from 250-six to roller cam 350, Vortec heads -- sold 1981 C10 Silverado LWB, 305, TH350C -- 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! |
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