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09-17-2024, 07:23 AM | #1 |
State of Confusion!
Join Date: Jul 2002
Location: Gulfport, MS USA
Posts: 47,037
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Re: Rear gear Ratio Opinions/Suggestions
My 70 was changed to 3.08, makes big difference on the highway.
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Bill 1970 Chevy Custom/10 LWB Fleetside 2010 Toyota Tacoma PreRunner SR5 Double Cab - DD Member of Louisiana Classic Truck Club (LCTC) Bill's Gallery Life isn't tied with a bow, but it's still a gift. Live simply. Love generously. Care deeply. Speak kindly. Leave the rest to God! |
09-17-2024, 11:12 PM | #2 | |
Registered User
Join Date: Jun 2010
Location: San Diego Co.
Posts: 1,172
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Re: Rear gear Ratio Opinions/Suggestions
Quote:
Just curious what your rpm is on the highway. I"ve never bothered trying to connect my clunky bench tach (for tuning) for a test drive...
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1972 Chevy C-10, SWB, Fleet, 350/350, PS, PB, HEI, mostly stock, Survivor. |
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09-18-2024, 07:10 AM | #3 |
State of Confusion!
Join Date: Jul 2002
Location: Gulfport, MS USA
Posts: 47,037
|
Re: Rear gear Ratio Opinions/Suggestions
350 yes, Tach yes, 3 speed manual, so at highway it would be sam as T350. Rpms are about 2300 at 70MPH, 60 is a hair over 2K. 265/70x16 tires or about 30.5 in high
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Bill 1970 Chevy Custom/10 LWB Fleetside 2010 Toyota Tacoma PreRunner SR5 Double Cab - DD Member of Louisiana Classic Truck Club (LCTC) Bill's Gallery Life isn't tied with a bow, but it's still a gift. Live simply. Love generously. Care deeply. Speak kindly. Leave the rest to God! |
09-18-2024, 09:35 AM | #4 |
Senior Member
Join Date: Jul 2000
Location: North Texas
Posts: 3,544
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Re: Rear gear Ratio Opinions/Suggestions
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.
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Mike 1969 C10 LWB -- owned for 35 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 24 years! This is the very first car/truck Internet forum I joined. I still used a dial-up modem back then! |
09-18-2024, 06:43 PM | #5 |
Registered User
Join Date: Jun 2010
Location: San Diego Co.
Posts: 1,172
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Re: Rear gear Ratio Opinions/Suggestions
Yeah, mine came out similar on Geezer’s calculator. I have 30” tires.
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1972 Chevy C-10, SWB, Fleet, 350/350, PS, PB, HEI, mostly stock, Survivor. |
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