Gear Ratio Help Needed

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Oct 11, 2002 | 11:01 PM

Harley83

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Joined: Jan 2002

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Gear Ratio Help Needed

Im running a 15x8 inch wheel in the back with 275/60/15's and 15x5 205//70/15 in the front. The motor is a Chevy 355 throwing out about 430 horses and Im looking for a better rear gear maybe 4.10's? any suggestions appreciated.. By the way the transmission is a 700R-4 and is used for daily driving

Oct 12, 2002 | 05:29 AM

ede

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From: Jackson County

with a OD trans 4:10s would be ok, be a lot of gear for the street but it'd work. 3:73s is the popular choice for most people here.

Oct 12, 2002 | 12:34 PM

chacane67

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I concur with ede......

Oct 12, 2002 | 02:24 PM

ANDYZ28

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Joined: Feb 2000

Posts: 1,515

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From: Midlothian,VA. 23112-6108

Car: 1982 Z-28

Engine: 5.0 w/ Holly carb

Transmission: TH-700R4

I also agree with ede.

Thanx,ANDYZ28

Oct 13, 2002 | 05:43 PM

IHI

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From: Waterloo, Iowa

Car: 86 firebird with 98 firebird interi

Engine: pump gas 427sbc Dart Lil M 13.5:1

Transmission: Oldani TH400 w/ BTE 9" convertor

Axle/Gears: 31 spline Moser/full spool/4.11Rich

If he's gonna be running 275/60-15's that is a 28" tall tire, the 4.10 or 4.11's would be the ultimate gear of choice for that. If he was running 275/50-15 26" then yes the 3.73 would be a better match. If his HP #'s are correct and if he ever wants to drag it, he'll never use the full motor in the 1/4, he'd probably only tach about 45-52 hundred depending on stall and cam. For a daily driver that will never see the strip stay with the 3.73 and you'll have a good all around gear. Depending on how light his car is he could easily get away with 3.42's, if it's 3300lbs or lighter.