differential ID 8 or 9

66StangGuy · 02-27-2002, 11:34 PM

I was wondering if there was an easy way to check if i have a 8.8 or 9 rear end.. i looked at the plate on the door and the diff code was scatched off like the previous owner changed it. not sure what gears i have or anything.. is the drain plug in the same place or is it different for the 8 and 9. anything easy like this to see if they are different? thanks.

Clark Rodgers · 02-28-2002, 10:06 AM

If you can get a socket setup on all of the nuts holding the third member in you have a 8 in.

73 Mustang Boy · 03-01-2002, 07:57 AM

Go to the back of the car and look at the diff. from the back if it is completely round you have a 9in if it has a flat spot at the bottom it is an 8 in.

02-27-2002, 11:34 PM	#1
66StangGuy Registered Member Join Date: Feb 2002 Location: Diamond Bar Posts: 258	differential ID 8 or 9 I was wondering if there was an easy way to check if i have a 8.8 or 9 rear end.. i looked at the plate on the door and the diff code was scatched off like the previous owner changed it. not sure what gears i have or anything.. is the drain plug in the same place or is it different for the 8 and 9. anything easy like this to see if they are different? thanks. __________________ 66 mustang-292-Holley 4160-World Castings Windsor Sr.-Hooker super comp headers-MSD box & Coil.3.55 gears. B&M Z-Gate-Black leather racing seats with 4pt harnes.

02-28-2002, 10:06 AM	#2
Clark Rodgers Registered Member Join Date: May 1999 Location: Rowlett,Texas Posts: 306	If you can get a socket setup on all of the nuts holding the third member in you have a 8 in. __________________ 69 393W Sportsroof deluxe

03-01-2002, 07:57 AM	#3
73 Mustang Boy Registered Member Join Date: Aug 2001 Location: Georgia Posts: 84	Go to the back of the car and look at the diff. from the back if it is completely round you have a 9in if it has a flat spot at the bottom it is an 8 in. __________________ 73 coupe, 351W, GT-40 heads, edlebrock 750, offenhauser intake, .488 lift cam, 2.5 exhaust, 2 chamber flowmasters, blah, blah, blah...

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