after reading various threads about diffs i have two questions....
1 what the hell is the diff i've just aquired off it's a 7.5 inch top mount and the prop turns just over 4 times to 1 revolution of the wheel.
2 this diff has good output bearings where as my lsd is about 3.6 turns of the prop to 1 of the wheel. but has a shot drive shaft bearing. is it an easy job changing the bearing and setting it back up
tony

well, i guess it will be a 7.5 inch diff with a 3.92 ratio! not sure how easy it is to change bearings, but if you move the crown and pinion it needs re shimming i think.

Was there a tag attached ?? if so try cleaning it up with a piece of emery cloth, diff ratio should be marked, sometimes difficult to read though. Rusty

Ford axle codes
A=3.36 B=3.77 D=3.92 F=3.842 J=4.056 K=3.31 M=3.14 N=4.29 P=3.58 J=3.62 V=3.33 Z=3.59 2=4.27 3=3.62 4=3.82 5=3.26 6=3.12 8=3.56

3,14 CW47-Pin15
3,38 CW44-Pin13
3,62 CW47-Pin13
3,92 CW51-Pin13
3,77 CW49-Pin13 6.5 inch diff

3,38 fitted to 1,6 OHC ECO 5 speed
3,38 fitted to 2,0 OHC HC
3,38 fitted to 2.3 v6 ESTATE
3,14 fitted to 1,6 OHC ECO 4 speed
3,14 fitted to 2.3 v6 SALOON
3.14 fitted to 2.3 Diesel

85GG 4006 DC --- 3.97
85GG 4006 BC --- 3.62
85GG 4006 AC --- 3.38
85GG 4006 FB --- 3.36
87BG 4006 GB --- 3.14

86GG 4006 AAA --- 3.92 LSD
V87BB 4006 BAA --- 3.62 LSD
V87BG 4006 CAA --- 3.38 LSD
85GG 4006 AAA --- 3.36 LSD

Vin plate codes for Diff ratio

Ratio Code
3.14 M
3.36 A
3.38 U
3.62 V
3.64 3
3.92 D