07-05-2018, 05:26 PM
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#5515
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Senior Member
Join Date: Jul 2000
Location: North Texas
Posts: 3,408
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Re: Restoring Rusty
Quote:
Originally Posted by Gregski
Saginaw Specifics
When looking at a Saginaw transmission, the front input shaft will likely have one or multiple grooves cut around its diameter. These grooves are there to indicate the ratios of the gears inside the transmission.
0 grooves: First 2.84, Second 2.01, Third 1.34, Fourth, 1.00 (I believe ours has zero grooves so it's this one)
1 groove: First 2.54, Second 1.84, Third 1.44, Fourth, 1.00
1 groove: First 2.54, Second 1.84, Third 1.32, Fourth, 1.00
2 grooves: First 3.11, Second 2.20, Third 1.47, Fourth, 1.00
3 grooves: First 3.50, Second 2.46, Third 1.65, Fourth, 1.00
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And the one with the tallest first gear (2.54) can handle the most torque. That's the ratio our trucks used for 350s with 3-speed manual trans.
The 3.50 first gear was used behind small six cyl engines, like the 250. Your 2.84 is probably right on the ragged edge for a 350, but I know you're a conservative driver. 
__________________
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!
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