Jeff Balazs Posted March 31, 2016 Report Posted March 31, 2016 When I built my truck I fitted a Grand Cherokee rear axle to take advantage of rear disc brakes (works great!) and a higher final drive ratio of 3.55. This ratio has turned out to be a bit too high for the fluid drive clutch. I think in retrospect a 3.73 ratio would have offered better acceleration and clutch life given the weight of this 3/4 ton truck. There is nothing wrong with the axle otherwise. Been trying to determine how best to correct this. I currently have P235/75 15 tires mounted. I wonder if I swapped in a set of 60 series tires if that would have almost the same effect as a rear axle gear ratio swap to 3.73? Jeff Quote
FN2 Posted March 31, 2016 Report Posted March 31, 2016 Jeff, I used this tire calculator, http://www.discounttiredirect.com/direct/infoTireMath.do , changing just tires from 75 series to 60 series seemed to give you about a 10 percent drop in speed which would be close to giving you the change in ratio. But my math may be wrong so you better check the numbers. 1 Quote
Jeff Balazs Posted March 31, 2016 Author Report Posted March 31, 2016 My math might be wrong too.......too many head injuries. Jeff Quote
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