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post #1 of 2 Old 06-17-2003, 02:21 PM Thread Starter
twmattox
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Join Date: Mar 2002
Location: Indianapolis
Posts: 1,324
Regear...

Planning out my regear strategy. If I follow what I have read, the ideal axle gear ratio will place crusing engine RPM at the point of maximum torque (when tranny is locked at 1:1). Please correct me if this is wrong.

Engine:AMC 4cylinder reaches maximum torque at around 2800RPM

Transmission: T-5 (has 1:1 ratio at 4th gear and approximately 0.86:1 ratio in 5th)

Tires: 31

Figuring on a crusing speed of 65, this places my crusing RPM at

Axle Ratio:3.73

4th gear: 2630 RPM (stock was approx. 2750)

5th gear: 2260 RPM(not an option stock)

or would it be better to go:

Axle Ratio:4.10

4th gear: 2890 RPM (stock was approx. 2750)

5th gear: 2485 RPM(not an option stock)

I use this rig mainly for daily driver (around 15% offroad mostly light trails). I want to get a good blend of take off ability, economy, parts durability, and the ability to pass if needed on the freeway. Any advice would be appreciated...(so long as it's not an engine swap!).

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post #2 of 2 Old 06-18-2003, 04:22 PM
jadams68
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1984 CJ7 
 
Join Date: Aug 2002
Location: Downingtown, PA
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I run 4.56 gears with 35" tires on my T-5 and I love it.
I only use 5th on the highway and I easily go 75... unless you're a cop... I usually keep it to about 55.... :-)

-----------------------
I used to own two CJ's...Perhaps a 3rd is in the future?
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