Differential ratios
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New User
Joined: Jan 2006
Posts: 7
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rear end
i have a 1986 ford bronco i changed the rear end but i did not know about gear ratios i need to find out what gear ratio i have on the front so i can get one to match in the rear please help me there are no tags on the front end or old rear end
Senior User
Joined: Aug 2002
Posts: 384
Likes: 0
From: montgomery city usa
If you still have a door sticker on the drivers door, look under axle and see what code it is. That will tell you the axle and gears for that vehicle. That is if they have not been changed before. for example if the code reads r7 then the rear is a limited slip 7.5 with 4:10 thus your front end would be 4:10s also. If you get the code post it and I will look up the axle.
Posting Guru
Joined: Aug 2004
Posts: 1,167
Likes: 1
From: miami florida
on bronco2 any years you have these codes as follows
you can find out also with your vin number.
42
open 7.5"
2640
3.45
44
open 7.5"
2640
3.73
47
open 7.5"
2640
4.10
D2
L/S 7.5"
2640
3.45
D4
L/S 7.5"
2640
3.73
D7
L/S 7.5"
2640
4.10
you can find out also with your vin number.
42
open 7.5"
2640
3.45
44
open 7.5"
2640
3.73
47
open 7.5"
2640
4.10
D2
L/S 7.5"
2640
3.45
D4
L/S 7.5"
2640
3.73
D7
L/S 7.5"
2640
4.10
