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09-16-2024, 08:52 PM
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#1 |
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Who Changed This?
 
Join Date: Jan 2013
Location: Simi Valley, CA
Posts: 10,807
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Re: Rear gear Ratio Opinions/Suggestions
 And it burned rubber in all 4 gears, too, I'll bet! Fact of the matter is, it would probably burn rubber in all 4 gears with a 4.11!As for me, I run the truck at 55 MPH with my setup. That shell blocks a lot of wind, but I'm retired, and not in any real hurry.
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~Steven '70 Chevy 3/4T Longhorn CST 402/400/3.56 Custom Camper Simi Valley, CA |
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09-17-2024, 07:23 AM
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#2 |
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State of Confusion!
 
Join Date: Jul 2002
Location: Gulfport, MS USA
Posts: 47,349
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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! |
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09-17-2024, 11:12 PM
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#3 | |
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Registered User
Join Date: Jun 2010
Location: San Diego Co.
Posts: 1,187
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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...
__________________
1972 Chevy C-10, SWB, Fleet, 350/350, PS, PB, HEI, mostly stock, Survivor. 
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09-18-2024, 07:10 AM
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#4 | |
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State of Confusion!
Join Date: Jul 2002
Location: Gulfport, MS USA
Posts: 47,349
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Re: Rear gear Ratio Opinions/Suggestions
Quote:
__________________
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! |
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09-18-2024, 09:35 AM
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#5 | |
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Senior Member
Join Date: Jul 2000
Location: North Texas
Posts: 3,635
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Re: Rear gear Ratio Opinions/Suggestions
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 -- 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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09-18-2024, 06:43 PM
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#6 | |
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Registered User
Join Date: Jun 2010
Location: San Diego Co.
Posts: 1,187
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Re: Rear gear Ratio Opinions/Suggestions
Quote:
__________________
1972 Chevy C-10, SWB, Fleet, 350/350, PS, PB, HEI, mostly stock, Survivor.
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09-17-2024, 11:59 PM
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#7 |
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Registered User
Join Date: Aug 2009
Location: Bowser
Posts: 13,752
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Re: Rear gear Ratio Opinions/Suggestions
Assuming a 28 inch tall tire it would be about 2600rpm.
I have this calculator saved. http://www.advanced-ev.com/Calculators/TireSize/ Last edited by geezer#99; 09-18-2024 at 12:16 AM. |
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09-18-2024, 01:18 AM
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#8 |
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Registered User
Join Date: Jun 2010
Location: San Diego Co.
Posts: 1,187
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Re: Rear gear Ratio Opinions/Suggestions
^^^^^Cool, thanks Geezer!
__________________
1972 Chevy C-10, SWB, Fleet, 350/350, PS, PB, HEI, mostly stock, Survivor.
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09-18-2024, 06:56 PM
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#9 |
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Senior Member
Join Date: Oct 2009
Location: Godley, TX
Posts: 17,985
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Re: Rear gear Ratio Opinions/Suggestions
custom10nut, if you share your tire diameter we can tell you exactly what your current rpm is at various speeds and what it would be with different trans and/or rear gearing at various speeds. Engine size and observed tach/mph readings aren't relevant.
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09-19-2024, 02:48 PM
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#10 |
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Senior Member
Join Date: Jul 2000
Location: North Texas
Posts: 3,635
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Re: Rear gear Ratio Opinions/Suggestions
Nice charts! Interesting to see the RPM increases from 55 to 65 and 65 to 75. More than I would have guessed off the top of my head.
Looks like the TH350 numbers assume no converter slip at all, which rarely happens even on a level highway.
__________________
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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