hemi swap ordered, gear set question - JKowners.com : Jeep Wrangler JK Forum
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post #1 of 2 Old 05-31-2017, 08:34 AM Thread Starter
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hemi swap ordered, gear set question

Hey all, So I'm committed to the hemi swap. I currently have 5.13's for my 08 auto and it was needed for my 35's and 3.8. (measured to 33.5...) and kinda buzzy on the highway. I'm turning 2600 ish at 75mph..

With the new power levels I will have with the v8 can I use 4.10's instead?

The 42re and 545rfe have the same final ratio 0.67 so it will be about the same rpms with the hemi. The 4.10's and my tires will be around 2100 rpm at 75 mph..and 1900 at 70mph..

I do not rock crawl ,it's mostly a mall crawler and grocery getter. I'm pretty pleased with my current setup of 2.5" lift and 35's. I had planned to wait and see what it ran like but I thought I'd ask in case I came across a set of take outs...

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post #2 of 2 Old 05-31-2017, 08:47 AM
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Check out the gear calc above to get a better idea of rpm/mph for existing and future drive ratio changes as part of the swap.
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