Planning on regearing? You may want to read
03-26-2014, 06:34 PM
#231
Forum Tech Advisor
I'm not sure if anybody said this but there is a simple formula to get the gearing that you want... ((Tire size you have)x(stock gear ratio you want to match)) / (stock tire size) = gear ratio you want Also you want to round up to the nearest gear size to offset the increased weight
The big advantage of the '12+s is less the engine and more the transmisson ratios. The transmission 5th/OD gear and 6th gear ratios are lower than 07-11 automatics and 6 speeds, requiring less differential gearing.
The 3.8L engine works fine if your differential gearing is low enough to run 2500-3000 rpm at 70 mph.
03-27-2014, 07:26 AM
#232
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The problem with that is that 07-11 automatics should have come with 4.56s or 4.88s to match the engine rpm and performance of the 07-11 6 speeds. The big advantage of the '12+s is less the engine and more the transmisson ratios. The transmission 5th/OD gear and 6th gear ratios are lower than 07-11 automatics and 6 speeds, requiring less differential gearing. The 3.8L engine works fine if your differential gearing is low enough to run 2500-3000 rpm at 70 mph.
03-27-2014, 03:20 PM
#234
JK Super Freak
03-27-2014, 03:56 PM
#236
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I'm not sure if anybody said this but there is a simple formula to get the gearing that you want... ((Tire size you have)x(stock gear ratio you want to match)) / (stock tire size) = gear ratio you want Also you want to round up to the nearest gear size to offset the increased weight
What you say is the equivalent of the question, "Which falls faster? A feather or a brick?"
35" tire is more than just height/size. It is rolling resistance, wind resistance of the tire itself. Increased ride height creating more wind resistance of the Jeep itself.
Sent from some string and a few tin cans.
03-27-2014, 05:32 PM
#239
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Anyone have opinions on a 2010 3.8 manual with 37 inch Toyo MTs. Mostly daily driver with mix of city and highway driving at most 45 min trip. It has 3.73s right now I'm not sure how far I want to go to reestablish full power and good 70mph highway rates.
03-27-2014, 07:14 PM
#240
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