Rear gear Ratio Opinions/Suggestions - The 1947 - Present Chevrolet & GMC Truck Message Board Network

09-18-2024, 09:35 AM

#30

MikeB

Senior Member

Join Date: Jul 2000

Location: North Texas

Posts: 3,625

Re: Rear gear Ratio Opinions/Suggestions

Quote:

Originally Posted by Palf70Step

350 yes, Tach yes, 3 speed manual, so at highway it would be same as T350. Rpms are about 2300 at 70MPH, 60 is a hair over 2K. 265/70x16 tires or about 30.5 in high

A TH350 would have a little slip at highway speeds, depending on load. My old tach wouldn't fit after I shortened my column, but I remember there was a 200-300 PRM difference between a slight downslope (light throttle) and an upslope. So with 29" tires, let's say if you see 2100 on level ground to downslope, that would be 2300-2400 so on an upslope. Of course the amount of "slip" depends on the converter.

__________________
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 -- 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!

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