Steve here is a chart that can help greatly in looking for an 8.8: The CODE is written on a stickon in the drivers door post.. So simply by opening the drivers door one can find what is under the back end.
The code on my Ranger is R7 which means I have a 31 spline locking rearend. It is the newer locker that doesn't have clutches as I have ever seen them.. Lots of gears and a principle I don't understand but it locks up fine when needed.
Oh yeah notice there is also a 7.5 axle..forget about those..
Big Jim <img src="/forums/images/graemlins/pfft.gif" alt="" />

Ranger
Code
Description
Capacity
Ratio

72
open 6-7/8"
2200
3.08

74
open 6-7/8"
2200
3.45

82
open 7.5"
2750
3.08

84
open 7.5"
2750
3.45

86
open 7.5"
2750
3.73

87
open 7.5"
2750
4.10

91
open 8.8"
2750
3.27

92
open 8.8"
2750
3.08

95
open 8.8"
2750
3.55

96
open 8.8"
2750
3.73

97
open 8.8"
2750
4.10

98
open 8.8"
2750
4.56

F4
L/S 7.5"
2750
3.45

F6
L/S 7.5"
2750
3.73

F7
L/S 7.5"
2750
4.10

R5
L/S 8.8"
2750
3.55

R6
L/S 8.8"
2750
3.73

R7
L/S 8.8"
2750
4.10

R8
L/S 8.8"
2750
4.56



(Note 4.56 geared axles '99-up are 31-spline)

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
Code
Ratio

85
3.55C

89 (1992-1998)
4.10C

89 (1999-2001)
4.56C

F5
3.55L

K6 4.10L