optimal gearing with motor replacement

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Aug 16, 2012 | 07:51 AM

Hotspur

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JK Enthusiast

Joined: May 2010

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From: Ballsack, TN

optimal gearing with motor replacement

Thinking about dropping a HEMI in 2010 six speed. I have 4.10s now and was wondering if they would be good with the new motor or hurt the new motor performance. It is my daily driver.

Aug 16, 2012 | 08:26 AM

mstrofpuppets

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From: casper,wy

Wondering this as well. I was going to put 4.88s in my 2011 JKUR with 35s but want to do a Hemi swap. Subscribed....

Aug 16, 2012 | 08:37 AM

keithsfd7

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From: Sparta NJ

Haven't done it but the way I understand it, the gearing choice has to do with the trans not the motor choice.

Aug 16, 2012 | 08:46 AM

prpichm

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Joined: Nov 2011

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From: Richards Landing, Ontario

I did a hemi swap and went with the 4:88 gears on 37's with a 6-speed. It is working very well for me.

Aug 16, 2012 | 09:02 AM

TheTerminator

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Joined: Mar 2011

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From: Vancouver, BC

Quote:

Originally Posted by keithsfd7

Haven't done it but the way I understand it, the gearing choice has to do with the trans not the motor choice.

I think it has to do with both, tranny and motor. You want to have your RPM in the optimal spot for a given motor. And RPM is dependant on tranny and diff gearing.

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