StrongFord
Well-Known Member
- Joined
- Oct 25, 2015
- Threads
- 13
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- 332
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- Location
- SE Michigan
- Vehicle(s)
- 2015 GT Premium, MT, Deep Impact Blue, 401A
- Thread starter
- #1
I have a 2015 GT manual with 3.31 ratio and cast iron housing. I purchased a used differential from a 2018 GT manual (verified in person) with 3.55 ratio and cast iron housing. Everything I have found indicates there are only two available flange options from Ford, one for manual and one for automatic - regardless of model year (2015-2018).
The 2018 flange has about a 1/8" smaller inside diameter than my 2015 flange. The 2018 flange also has a taper at the top where my 2015 flange does not. The driveshaft will not press into the pinion flange. The 2018 flange has a Ford part number HR3W-4851-BA printed on it. The 2015 flange is too rusted to find a part number.
I could swap the flanges, but since they are both manuals and supposedly they should mate, I did not want to jump into another project without knowing if it's necessary. Ultimately I put my 2015 differential back into the car.
What the flange is going on here? Anyone encounter this issue?
Note the taper at the top of the flange. The driveshaft and flange are hard contact. They could not be pulled together any further than this point. The driveshaft should insert as deep as the window opening.
The caliper was set to the I.D. of the 2018 flange. You can see how much smaller it is than my 2015 flange.
The 2018 flange has about a 1/8" smaller inside diameter than my 2015 flange. The 2018 flange also has a taper at the top where my 2015 flange does not. The driveshaft will not press into the pinion flange. The 2018 flange has a Ford part number HR3W-4851-BA printed on it. The 2015 flange is too rusted to find a part number.
I could swap the flanges, but since they are both manuals and supposedly they should mate, I did not want to jump into another project without knowing if it's necessary. Ultimately I put my 2015 differential back into the car.
What the flange is going on here? Anyone encounter this issue?
Note the taper at the top of the flange. The driveshaft and flange are hard contact. They could not be pulled together any further than this point. The driveshaft should insert as deep as the window opening.
The caliper was set to the I.D. of the 2018 flange. You can see how much smaller it is than my 2015 flange.
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