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Old 02-09-2013, 06:12 PM
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Gear ratio

Hello all I have a 2.5 with the 3 speed auto..could someone enlighten me on the correct gear ratios for 33x12.50x15 and 35x12.50x15..looking for more performance off road and less on road as my jeep on sees maybe 3000 miles on road per year. Thanks guys!
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Old 02-09-2013, 06:41 PM   #2
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4.88 is as deep as you'll go with the D30.

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Old 02-10-2013, 12:20 PM
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Yeah i know im just looking for the most idea gears for those tires with my motor and trans
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Old 02-11-2013, 10:56 PM
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Anyone?
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Old 02-11-2013, 11:16 PM   #5
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4.88's with 33's is 3500 rpm at 70 mph. With 35's your looking at 3300@70.
It is going to depend on how you drive and wheel. If you do a lot of freeway and hills then 33's would be my choice. If you wheel and street drive then you "could" go to 35's but having had a 2.5 stick I would say 33's with 4.88 is your best all around with the 3 speed auto. It ought to crawl nicely with that setup.
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Old 02-12-2013, 08:55 AM   #6
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4:88's is what you want
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Old 02-12-2013, 09:03 AM
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Thanks gunner! Im not worried about street use or highway because my jeep sees little to no road use except buzzing around town. Im looking for a good crawl setup. Id like to be able to go 4low 1 gear and descend down a hill and let my motor do 80% of slowing me down.
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Old 02-12-2013, 09:12 AM   #8
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4.88 is the usual recommendation for 33" tires when you have the 5-speed manual transmission and 2.5L engine. But with your 3-speed automatic and 2.5L engine, I'd probably go 4.56 for 33" tires.
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Old 02-12-2013, 09:26 AM
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Thank you mr bransford..what would 4.56 with 33s be like off road? Would it be able to slow me down much better than my 3.55 with 31s?

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