Quick reply needed about dif/max speed.

[Eternal]

Got the original diff i found as well as listed as ford 7.5inch lsd. For £120 but did a offer for £100 that was accepted and its in Poole so only 15min drive. Think that is a ok price or should i have haggled a bit more?
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"1992 GRANADA 7.5"LSD GOOD WORKING CONDITION WAS BEING USED UNTIL RECENTLY WHEN FAILED MOT
DIFF TAG READS 91 GG ADA 3.64"

checking on locostbuilders found this

Diffs:

Sierra 1987-1993:

91GG 4006 ABA - AXLE ASY-RR LWHD & B 3.91 Sierra/Granada/Scorpio LSD typ 2
91GG 4006 GA - AXLE ASY-RR LWHD & B 3.91 Sierra/Granada/Scorpio typ 2
91GG 4006 AAA - AXLE ASY-RR LWHD & B 3.36 Sierra/Granada/Scorpio LSD typ 2
85GG 4006 DC - AXLE ASY-RR LWHD & B 3.92 Sierra/Granada/Scorpio typ 2
V87BG 4006 BAA/CAA/DAA - AXLE ASY-RR LWHD & B 3.62 Sierra/Granada/Scorpio LSD typ 2
V86BB 4006 AAA - AXLE ASY - RR LWHD & B RATIO 3.64 Sierra Cosworth LSD typ2

Sierra 1982-1986:

V86BB 4006 AAA - AXLE ASY - RR LWHD & B RATIO 3.64 Sierra Cosworth LSD typ2
V87BG 4006 BAA - AXLE ASY-RR LWHD & B 3.62 Sierra/Granada/Scorpio LSD typ 2

Granada/Scorpio 1985-1992

85GG 4006 ACA - AXLE ASY-RR LWHD & B 3.64 Granada/Scorpio LSD typ2
85GG 4006 AAA - AXLE ASY-RR LWHD & B 3.36 Sierra/Granada/Scorpio LSD typ2
91GG 4006 AAA - AXLE ASY-RR LWHD & B 3.36 Sierra/Granada/Scorpio LSD typ 2
91GG 4006 ABA - AXLE ASY-RR LWHD & B 3.91 Sierra/Granada/Scorpio LSD typ 2
91GG 4006 ACA - AXLE ASY-RR LWHD & B 3.64 Granada/Sierra LSD (Cosworth) typ2
91GG 4006 GA - AXLE ASY-RR LWHD & B 3.91 Sierra/Granada/Scorpio typ 2
91GG 4006 ADA - AXLE ASY-RR LWHD & B 3.64 64 Granada/Scorpio LSD (Cosworth) typ2

Granada/Scorpio 1992-1994

V87BG 4006 BAA - AXLE ASY-RR LWHD & B 3.62 Sierra/Granada/Scorpio LSD typ 2
85GG 4006 DC - AXLE ASY-RR LWHD & B 3.92 Sierra/Granada/Scorpio typ 2
86GG 4006 AAA - AXLE ASY-RR LWHD & B 3.92 Sierra/Granada/Scorpio LSD typ 2
91GG 4006 AAA - AXLE ASY-RR LWHD & B 3.36 Sierra/Granada/Scorpio LSD typ 2
91GG 4006 ABA - AXLE ASY-RR LWHD & B 3.91 Sierra/Granada/Scorpio LSD typ 2
91GG 4006 ACA - AXLE ASY-RR LWHD & B 3.64 Granada/Scorpio LSD typ 2
91GG 4006 GA - AXLE ASY-RR LWHD & B 3.91 Sierra/Granada/Scorpio typ 2

Scorpio 1994 – 1998

95GG 4006 AAA - AXLE ASY-RR LWHD & B 4.09 Granada/Scorpio LSD typ2
95GG 4006 ACA - AXLE ASY-RR LWHD & B 3.64 Granada/Scorpio LSD typ2
96GG 4006 CA - AXLE ASY-RR LWHD & B 4.09 Granada/Scorpio typ2 different mounting bracket (koala)
96GG 4006 BAA - AXLE ASY-RR LWHD & B 4.09 Granada/Scorpio LSD different mounting bracket (koala)
96GG 4006 DA - AXLE ASY-RR LWHD & B 4.27 Granada/Scorpio typ2 different mounting bracket (koala)
96GG 4006 BCA - AXLE ASY-RR LWHD & B 3.64 Granada/Scorpio LSD typ2 different mounting bracket (koala)
96GG 4006 BDA - AXLE ASY-RR LWHD & B 3.36 Granada/Scorpio LSD typ2 different mounting bracket (koala)
95GG 4006 AA - AXLE ASY-RR LWHD & B 4.09 Granada/Scorpio typ2
95GG 4006 JA - AXLE ASY-RR LWHD & B 3.64 Granada/Scorpio typ2
95GG 4006 LA - AXLE ASY-RR LWHD & B 4.27 Granada/Scorpio typ2

soooo got the right diff and can use all the rest of the stuff. Fantastic
thanks everyone for advice!