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Thread: which Gear 3.55 Posi or 4.11?
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12-19-2010 #1
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which Gear 3.55 Posi or 4.11?
Mostly street with 17" rear wheels.
1957 Chevy Bel Air sold
1972 Chevy Chevelle sold
1974 Porsche 911 Carrera sold
1968 Ford Mustang coupe
"That's a hell of a cam for the street son."
http://www.youtube.com/watch?v=xhBtRMtpgzE
http://www.cardomain.com/ride/3873446/1968-ford-mustang
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12-19-2010 #2
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- Houston, TX
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Details on engine, transmission, vehicle type/weight, and rear tire height please.
Who is wise? One who learns from every man... Who is strong? One who overpowers his inclinations... Who is rich? One who is satisfied with his lot... Who is honorable? One who honors his fellows" - Ben Zoma, Ethics of the Fathers, 4:1
12-31-2010 #3
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- Gilroy, Ca
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3.55 With 17" wheels and mostly street, then stick to street gears. I wouldn't use 4.11's unless it was mostly used for drag racing.
12-31-2010 #4
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All depends on the tranny and tire/wheel combo. My FE with a TKO-600 has 4.10s and 4.30's would work great, but that same combo with a 4 speed was buzzy with 3.70's
70 Mustang - 489 cid FE, KC ported Edelbrock heads, Modified Victor Intake, Mass-flo EFI, Erson valvetrain, Supercomps, TKO-600, 4.10 9 inch.
71 F-100 4x4 SB 4x4, 461 cid FE stroker, Edelbrock Pro-flo 4 EFI
13 Ram Laramie 2500 4x4 6.7 diesel - trailer puller
01-01-2011 #5
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- Aug 2008
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- Pgh, PA
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Without exception, everyone I know with a street car without an overdrive but with more than 3:73 gears wishes they had something else. Highway driving is impossible at reasonable speeds. Otoh, even with 3.73 in mine withnthe tko600, 1st gear is very low.
'66 GTO Vert Project "Red Ink", 462ci of stroked pontiac power, TKO600, SC&C Stg II+, Tubular lowers, Currectrac Rear suspension, Moser 12bolt w/Truetrack, Wilwood Master and discs all around, too much fun for words...
01-01-2011 #6
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- Eastern Virginia
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If a single overdrive of around 75% I would not go any deeper than 3.73, if you have a dual overdrive like a T56 with a 50% ratio you can get away with something deeper. I have the T56 with 50% 6th gear & 3.42 gears & hardly ever use 6th unless I am on the interstate. The stock Monte had 3.73 gears with the 200r4 tranny & was good. I have 3.42 gears because that is what was in the Grand National rear when I got it. Eventually I would like to go with something between 3.73 & 4.10.
Scot
86 Monte SS
05-16-2011 #7
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- Mar 2008
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- Silverdale,Wa
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Go to ringpinion.com then calculators.Enter your r&p ratio & tire diameter.This will give you your RPM at 60 mph.
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