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01-28-2012, 03:12 PM
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#1 |
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Account Suspended
Join Date: Apr 2008
Location: Hesperia, Ca
Posts: 1,332
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Best Gear Ratio for Overdrive Trans
Just kicking around some ideas...
I'm swapping in TBI 454 into my '77 dually and now I'm seriously considering swapping over to a 4L80E trans. I'm curious what the consensus would be regarding the optimal gear ratio for that particular setup. It's a Dana 70 HD rear end. I'm assuming it's got 4.11's in it now, although I never bothered to check. Tire size is 225/75/16. Any thoughts? |
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01-28-2012, 03:21 PM
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#2 |
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Registered User
Join Date: Feb 2011
Location: Lake, Michigan
Posts: 219
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Re: Best Gear Ratio for Overdrive Trans
I went on Randys Ring And Pinion 55mph= 1833rpm
65mph= 2167rpm 75mph= 2500rpm |
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01-28-2012, 07:37 PM
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#3 |
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driving is in my blood
Join Date: Dec 1999
Location: Mesa AZ
Posts: 5,748
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Re: Best Gear Ratio for Overdrive Trans
Best gear ratio for what? Towing, fuel mileage, acceleration?
__________________
-78 c10 short/step: 388cid, M20, 5/5 drop, lots more. Playtoy and first vehicle. -98 c1500 x-cab: 5.7L, 17" rims, 5/6 drop, flowmaster, helper bags,NBS rear disk brakes. -02 Suburban 4x4: leveled front -CBR600F4i, CBR600RR, CBR1000RR, and standup skis DISCLAIMER: I cant spell for the life of me. |
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01-28-2012, 11:28 PM
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#4 |
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Account Suspended
Join Date: Apr 2008
Location: Hesperia, Ca
Posts: 1,332
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Re: Best Gear Ratio for Overdrive Trans
General purpose.
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01-29-2012, 01:12 AM
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#5 |
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Registered User
Join Date: Nov 2011
Location: florida
Posts: 12
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Re: Best Gear Ratio for Overdrive Trans
I like 3:73. But that's just me.
T |
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01-29-2012, 01:32 AM
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#6 |
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Just here to tinker
 
Join Date: Jun 2008
Location: Holland, MI
Posts: 3,697
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Re: Best Gear Ratio for Overdrive Trans
I also like 3:73's. They work great for towing but don't make the engine scream down the highway like 4:11's.
__________________
78 C10 SWB Diesel #1 (wrecked)http://67-72chevytrucks.com/vboard/s...1978+silverado 78 C10 SWB Diesel #2 (sold)http://67-72chevytrucks.com/vboard/s...d.php?t=650751 60 GMC Suburban (sold)http://67-72chevytrucks.com/vboard/s...d.php?t=445526 60 GMC 1000 (sold)http://67-72chevytrucks.com/vboard/showthread.php?t=298235 67 GMC 1500 (sold) http://67-72chevytrucks.com/vboard/s...d.php?t=803695 73 Chevy C20(Daily)http://67-72chevytrucks.com/vboard/s...d.php?t=852767 86 Suburban(summer unit) http://67-72chevytrucks.com/vboard/s...d.php?t=810697 88 Suburban 4x4(sold) |
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01-29-2012, 02:17 AM
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#7 |
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Registered User
Join Date: Nov 2009
Location: Edmonton Alberta
Posts: 286
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Re: Best Gear Ratio for Overdrive Trans
I have 4.10's now with a 454...
Don't plan on doing much highway travel, and if you do make damn sure you know where your next fuel station is... you won't be passing many I personally am going to re-gear it because although i tow on a regular basis 4.10's are just not needed. How ever i only have a Turbo 400... I can't comment on it if you got that extra gear in there. I think it would certainly be tolerable
__________________
1989 3+3 2wd Dually. 454 BB. Factory loaded for the day, including Alcoa rims. |
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