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thechristyfz450 12-18-2012 12:32 PM

Gearing swap
Hi i have a wk 3.7 2006 and i swapped the front and rear ring and pinions from 3.07 to 3.73 ,. the thing is that with the new ratio sends the tranny into safe mod ,i tried to program it with my hypertech but still doesnt work,. what can i do to make it work??

Jordan's Jeep 12-18-2012 02:35 PM

Re: Gearing swap
Did you swap out the entire front end from another grand cherokee?

thechristyfz450 12-19-2012 09:09 AM

Re: Gearing swap
I used only the ring and pinions for the front and the rear of a 4.7 wk ,.I took my jeep to the dealer today to reprogram for the new ratio and now it works great !!!!!

Drew 12-19-2012 09:24 AM

Re: Gearing swap
That is fantastic news! I've been thinking of doing this myself as well. Just worried I can't find a dealer willing to work with me to make the changes in the computer....

What kind of revs are you running at highways speeds? What size tires are you running currently?
Any feedback you can give us on how it drives now with the new gears?

thechristyfz450 12-20-2012 04:32 AM

Re: Gearing swap
I havent been to the highway yet,.but i can tell you that it pulls way better now !!

Strongjeff 12-23-2012 10:34 PM

Re: Gearing swap
what year 4.7 grand did you get the rear ring/pinion gears from, im looking into doing this on my 08

Strongjeff 12-23-2012 10:37 PM

Re: Gearing swap
ive got a programmer to take care of the computer

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