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02 Lightning gear change

Posted: Thu May 13, 2021 8:00 pm
by rjdboss94
I have a friend with 02 Lightning and he has changed his rear gear to 4.10. We are trying to make changes to to the GEM module to update it but are not having luck. Any ideas. THX

Re: 02 Lightning gear change

Posted: Fri May 14, 2021 11:52 am
by Lethal51!
I just did the same on a 2007 GT any help is greatly appreciated

Re: 02 Lightning gear change

Posted: Fri May 14, 2021 12:40 pm
by Ecmbuster
It may not even work and if a change was accomplished, the PCM not going to behave correctly because of the inherited speed signal and ratio change.
Two choices:
Have Ford re-flash the correct ratio into the PCM
Have a "performance" programmer tweak the speed input.