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Old 12-11-2009, 11:28 AM   #1
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Gear a 2.5L 4Cyl?

I recently bought a 98 tj 4 cyl. engine swap is a no go. Would a 4.10 or 4.56 be appropriate to push 33" tires?
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Old 12-11-2009, 11:30 AM   #2
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yes

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Old 12-11-2009, 11:47 AM   #3
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both will push them, but 4.56 will push better. 4.88's would push best, but that dana 30 gear gets really really small at the point..
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Old 12-11-2009, 12:08 PM   #4
Knows a couple things...

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For 33" tires, 2.5L engine, and the 5-speed manual transmission, go right to 4.88. 4.56 is recommended for the larger 4.0L engine and 33" tires but for your 2.5L, 4.88 is the correct ratio. The D30 is fine with 4.88 gearing, I've been running 4.88 for 8 years with 35" tires and f/r lockers and the only thing I've broken up front on my Dana 30 was an axle shaft. 4.88 is the standard recommendation for 33" tires and the 2.5L... 4.56 is not enough gear for that engine and 33" tires. Trust me on this, the 2.5L engine needs those slightly higher rpms to perform well with that big of a tire.
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Old 12-11-2009, 12:16 PM   #5
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Quote:
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yes
I meant kinda
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Old 12-11-2009, 05:35 PM   #6
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i have 4.10s with my 4 banger and 33s it gets up and goes still
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Old 12-11-2009, 07:07 PM   #7
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you should already be on 4.10s i'll be doing 4.88s someday. for now, im on 33's and i don't have any complaints, maybe not a ton of power, buttt the gas economy aint all to bad.

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