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CodyA 12-11-2009 11:28 AM

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?

terrible2 12-11-2009 11:30 AM


4Jeepn 12-11-2009 11:47 AM

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..

Jerry Bransford 12-11-2009 12:08 PM

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. :)

terrible2 12-11-2009 12:16 PM


Originally Posted by terrible2 (Post 503472)

I meant kinda

garett73 12-11-2009 05:35 PM

i have 4.10s with my 4 banger and 33s it gets up and goes still

kdukes4 12-11-2009 07:07 PM

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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