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Re: school me on rear end gearz
[Re: Pacnorthcuda]
#447396
08/23/09 08:38 PM
08/23/09 08:38 PM
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Joined: Dec 2007
Posts: 18,157
Mass
DAYCLONA
I Live Here
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I Live Here
Joined: Dec 2007
Posts: 18,157
Mass
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Quote:
Using Randy's Ring & Pinion calculator and a 27" tire I get 66 mph with the 3.55 at 3000rpm and 60 mph at 3000 with the 3.91. Auto tranny.
With typical tire sizes the 3.55 really is the compromise gear, doing both tasks adequately but not optimally. The 3.91 are far better around town (for performance driving) but they do poorly on the highway on long trips.
The speed calculators are a good base reference, but are general, and can't compensate for real world conditions, such as air drag, HP, aerodynamics of the car, smblk, BBlk, etc,.......my Challenger T/A with 3:91's with a 27 " tall tire, would do about 60 MPH at about 4000 RPM,......my 70 SuperBee with 3:91's with a 27 " tire, and 440 would do about 60 MPH at about 3800 RPM,.....neither was enjoyable on the highway,.......that's what a Keisler is for! 
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