4.10 was an option, diff code D2.
Explorer
Code
Description
Capacity
Ratio
41
Open 8.8"
3200
3.27
43
Open 8.8"
3200
3.08
44
Open 8.8"
3200
3.73
45
Open 8.8"
3200
3.55
D1
L/S 8.8"
3200
3.27
D2
L/S 8.8"
3200
4.10
D4
L/S 8.8"
3200
3.73
D5
L/S 8.8"
3200
3.73
L - Limited Slip Differential
C - Conventional Differential
This is a 3L V6 auto with 35" tires. A 4.75 would bring him back to stock. I think he's going to run the 4.10s for now and upgrade to 4.88s in the future.
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I <3 forced induction.
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