View Full Version : Rear Axle ID tag Translation
10-26-2004, 11:43 PM
Need a bit of help deciphering the numbers on the ID tag of an 8.8 disc brake axle.
From what I can tell the tag on the axle reads:
1st line: 431D
2nd line: 3SL55 88 8F22
I have some pics at
I read the info at
but the 3SL55 threw me for a loop.
Shouldn't it have either an S or an L not both?
Thanks for help translating
should be posi 3.55, thats what is on my 5speed 8.8 axle in the back yard
10-26-2004, 11:57 PM
should be 8.8 355 rear. if it came from a lincoln it was a mark7 though, not a mark 8. im not so sure those lincolns came with 355s though. :dunno:
mark7's could have 2.73s 3.27s i think, also the disks on back are bigger than tc disks, not to mension the caliper pistons are bigger.
10-27-2004, 12:53 AM
If you remove the differential cover you can count the number of teeth on the ring and pinion gears and divide the ring # by the pinion #. That will tell you what rear gears you actually have. The tag on the rear is the same one that's on mine which I pulled out of an 87 Turbocoupe with a 5 speed. It should be a 8.8 traction lock with 3.55 gears.
10-27-2004, 12:54 AM
First line... (431D) is the axle code that you can look up in the shop manual to get the info already on the second line(duhhh Ford).
3SL55 Traction Lock 3:55 (All the Turbo Coupes seem to have the "SL" in the ratio)
88 = 8.8" ring gear
8F22 = axle build day(June 22 '88), a rather late one(for a TC) I might add.
Disc brakes, 8.8" and 3:55s has to be from a 5 speed Turbo Coupe. None of the V8 cars(LSC included)had more than 3:27 gears from the factory.
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