3.31 Ring and Pinion Availability

Lein · Jul 23, 2017

I am 99% certain that I want to drop (increase?) from 3.73 to 3.31 in my procharged 2015 GT PP. Only it seems at this point that the selection of 3.31 gears for 2015+ is non-existent. A few articles seem to mention the Ford Performance gears with part number M-4209-88331A (the A being the important distinction to indicate 2015+) but nobody seems to actually stock them.

Does anyone have some input as to a good source for a new 3.31 set and accompanying installation necessities?

Stang-15 · Jul 23, 2017

Lein said:
I am 99% certain that I want to drop (increase?) from 3.73 to 3.31 in my procharged 2015 GT PP. Only it seems at this point that the selection of 3.31 gears for 2015+ is non-existent. A few articles seem to mention the Ford Performance gears with part number M-4209-88331A (the A being the important distinction to indicate 2015+) but nobody seems to actually stock them.

Does anyone have some input as to a good source for a new 3.31 set and accompanying installation necessities?

I just did the swap a couple weeks ago. Late Model Restoration had the gear.

Lein · Jul 23, 2017

Looks good. Did you order anything else from them to go along with this? M-4210-B3 seems to be the parts kit to go along with 2015+ gear sets.

Stang-15 · Jul 23, 2017

Lein said:
Looks good. Did you order anything else from them to go along with this? M-4210-B3 seems to be the parts kit to go along with 2015+ gear sets.

I ordered the parts kit but ended up returning it as it wasn't needed. The gear came with everything that was needed. I only have 8k on my car and didn't really think I needed to replace all of the hearings the kit came with.

whatsup62 · Jul 24, 2017

Might have a deal for you..im in Iowa not far away. I have an entire center section out of car (complete with manual yoke)... 0 miles 3.31 traction lock.

steviebee72 · Jul 24, 2017

I did the swap as well, 3.73 to 3.31 Whipple powered PP car.

Ford makes the 3.31 gears. (not Ford Performance)
I had a local shop do the install so no instructions i can give you..

Angry50 · Jul 25, 2017

i currently have the 3.55 (factory upgrade) in my car and have toyed with the idea of dropping to the 3.31 but not sure how beneficial it will be.. did you notice much difference going from 3.73 to 3.31?

Tommy V · Jul 25, 2017

Angry50 said:
i currently have the 3.55 (factory upgrade) in my car and have toyed with the idea of dropping to the 3.31 but not sure how beneficial it will be.. did you notice much difference going from 3.73 to 3.31?

Big difference,i can now go the 1/4 in 4th gear.It did lose some of its snap on initial wot but stays in each gear longer which keeps the car in boost longer.

Angry50 · Jul 26, 2017

Tommy V said:
Big difference,i can now go the 1/4 in 4th gear.It did lose some of its snap on initial wot but stays in each gear longer which keeps the car in boost longer.

just havent decided if it would be worth the coin drop to got from 3.55-3.31

Tommy V · Jul 26, 2017

Angry50 said:
just havent decided if it would be worth the coin drop to got from 3.55-3.31

Yea 355 to 331 imo is not going to be worth the change.Just not that much difference in gears.

Dsquared · Jul 26, 2017

THIS is why these forums are so great. I was just coming online to post a similar question. Having a Roush installed this weekend, right now I'm running 3.73's, the guy doing my work has 3.55's, thinking about doing a straight trade. He wants my 3.73's...But then, I also have heard I should go 3.31's, so I'm on the fence. If we just swap differentials, is it a straight swap fitment wise between the two?

yomamma219 · Jul 26, 2017

If anyone wants the 3.31s off my EB Ill take your 3.73s

TooSoonJunior · Jul 26, 2017

Is it hard to do the gear swap on the pumpkin? is there any writeup or DIY?

Stang-15 · Jul 26, 2017

TooSoonJunior said:
Is it hard to do the gear swap on the pumpkin? is there any writeup or DIY?

I used the Ford procedure for removing the actual pumpkin. That was fairly easy. I wasn't about to attempt the ring and pinion swap myself, so I paid a Ford tech I know to do that on the side. I upgraded by differential bolts to the ones offered by BMR since I already had it taken apart.

Tommy V · Jul 26, 2017

Dsquared said:
THIS is why these forums are so great. I was just coming online to post a similar question. Having a Roush installed this weekend, right now I'm running 3.73's, the guy doing my work has 3.55's, thinking about doing a straight trade. He wants my 3.73's...But then, I also have heard I should go 3.31's, so I'm on the fence. If we just swap differentials, is it a straight swap fitment wise between the two?

Its not worth goi g 373 to 355 now 373 to 331 is quite a difference.If u dont track your car i would stay with the 373,alot more fun.

3.31 Ring and Pinion Availability

Lein

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Stang-15

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Lein

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Stang-15

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whatsup62

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steviebee72

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Angry50

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Tommy V

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Angry50

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Tommy V

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