Question about ratio of Ring and Pinion
#1
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Year: 1999
Model: Cherokee
Engine: 4.0L
Question about ratio of Ring and Pinion
i Got new Jeep XJ (factory) 1999 model
with 3 inch lift kit
just added 32 Tyres and its performance is slow so want to buy ring and pinion. want help about best ratio for ring and pinion to add for that tyres size.
with 3 inch lift kit
just added 32 Tyres and its performance is slow so want to buy ring and pinion. want help about best ratio for ring and pinion to add for that tyres size.
#2
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Year: 1993
Model: Cherokee
Engine: 4.0
MPH x differential ratio x 336 / tire height x top gear ratio = RPM for that speed
Example: 70 x 3.55 x 336 / 32 x .75 for an auto = 1957 rpms at 70 mph
1957 rpm should be about what you are turning at 70 mph. You should probably
go a little lower to make up for the rolling resistance of the taller tires.
Maybe something like this?
70 x 3.73 x 336 / 32 x .75 = 2056 rpm at 70 mph
Or if you want power something like this?
70 x 4.10 x 336 / 32 x .75 = 2260 rpm at 70 mph
Last edited by Rock Toy; 01-28-2011 at 02:13 PM.
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