Base Model Ecoboost 3.73 Gears

[KadenW23]

Has anyone had any experience with putting new rear gears in our cars? I have the base model 3:15, and I want to jump up to 3:73. If so, where did you buy your gears from?

Sponsored

 

[speedfrk]

Has anyone had any experience with putting new rear gears in our cars? I have the base model 3:15, and I want to jump up to 3:73. If so, where did you buy your gears from?

Don't think 3.73 will fit in the 3.15 housing. You will need to swap the entire diff.

 

[Fast64ranchero]

There's a couple of us that have 3.73's. Your 3.15 housing will not work. Best option is look for a complete carrier out if a GT PP

 

[jrock]

From American Muscle:
http://www.americanmuscle.com/frpp-373-gears-2015.html
Application Note. These Ford Racing 3.73 gears are not compatible with a 3.15 ratio differential - use differential M-4204-MT or M-4204-M.

 

[ElAviator72]

Don't think 3.73 will fit in the 3.15 housing. You will need to swap the entire diff.

Also, be aware that Ford uses cast steel housings for the manual transmissions, and aluminum for the automatic...but I'm wondering if an aluminum 3.73 housing will work ok in a MT car? Since it is engineered for the V8, I'm thinking you could probably get away with aluminum on the manual in the ecoboost... ;)

Oh, and obviously a diff swap where you're changing ratios is going to require a PCM re-flash to tell the PCM about the new rear end ratio!

 

[KadenW23]

Also, be aware that Ford uses cast steel housings for the manual transmissions, and aluminum for the automatic...but I'm wondering if an aluminum 3.73 housing will work ok in a MT car? Since it is engineered for the V8, I'm thinking you could probably get away with aluminum on the manual in the ecoboost... ;)

Oh, and obviously a diff swap where you're changing ratios is going to require a PCM re-flash to tell the PCM about the new rear end ratio!

Of course! well thank you guys for all your info, I think I've got everything I need,

Sponsored