02 Lightning gear change

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rjdboss94
Posts: 1
Joined: Fri Mar 05, 2021 6:33 pm
Vehicle: Ford F150 5.4Litre 300HP 2004

02 Lightning gear change

Post 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
Lethal51!
Posts: 3
Joined: Fri Mar 26, 2021 9:12 am
Vehicle: Mustang 4.6L/V8, 2007

Re: 02 Lightning gear change

Post by Lethal51! »

I just did the same on a 2007 GT any help is greatly appreciated
Ecmbuster
Posts: 1303
Joined: Sun Mar 15, 2015 4:08 am
Vehicle: Volvo Bertone and two Motorcyles
Location: On a spinning rock

Re: 02 Lightning gear change

Post 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.
Do not ask for help in PM. Use the forum to ask and answer questions!
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