Info on my Gear Ratio

[Obscure]

"Hello everyone,
I need some help decoding the numbers on the small metal tag attached to my rear axle. I’m planning to rebuild my rear differential and want to make sure I order the right parts. I found several complete kits on RockAuto, but I’m having trouble understanding what these numbers mean. Any assistance would be greatly appreciated!"

 

[Turdle]

I think it's a 3.73 , most likely limited slip.
Check your door manufacture tag for an axle code to be sure

Solved - Transmission and Axle codes.

Well, I searched but was not able to find it on this site. So in case someone else searches for them, I thought I'd post this info here: Axle Codes L - Limited Slip Differential C - Conventional Differential Code ... Ratio 41 ...... 3.27C 42 ...... 4.10C 43 ...

www.explorerforum.com

 

[wollimann]

I would say you have 8.8 differential with 3.73 gear ratio and limited slip/traction lock.

 

[Obscure]

Thanks yall

 

[wollimann]

I found several complete kits

These kits are not always complete if you have the limited slip axle, the clutch plates must be ordered
seperately.

Ford Performance Parts M-4700-C Ford Performance Parts 8.8 in. Traction-Lok Rebuild Kits | Summit Racing

Free Shipping - Ford Performance Parts 8.8 in. Traction-Lok Rebuild Kits with qualifying orders of $109. Shop Differential Carrier Rebuild Kits and Spider Gears at Summit Racing.

www.summitracing.com

Unfortunately sometimes the lock screw brake while disassemling. Inspect the spider gears, s-spring and center pin for wearout.
If you plan a complete rebuild you need a crush sleeve too. A complex affair to get the optimal contact pattern of ring and pinion.

 

[C420sailor]

If you use Ford OEM gears, the existing shimming will work. I used SKF bearings and seals and Ford gears and the shimming was balls on.

Aftermarket gears and it gets more complicated