Gears and shims

Repostyle · May 28, 2006

So, I've got a spare rear end that I'm putting a motive bearing kit in with FRPP 3:73's and 28 spline 5 lug ranger axles. I'm also putting on SN95 gt disk brakes but that doesn't matter for this question.

My question:

I've found some info on the pinion gear depth settings, but I can't find anything to get me close on my first fitting of the rear diff. backlash. Has anyone ever installed gears themselfs and could maybe give me the right and left shim thickness you used for your 373's? And did you use the old bearings and shims or new ones?

superhuaman · May 28, 2006

start with the old ones...sometimes they wont fit, so you have to use skinnier ones to just slip-fit. then torque the bearing caps to 80 ft-lbs, and if your backlash is within range (.008" to .015", .011-.015 preferred) then add i believe .010" to each side and youre done

Repostyle · May 29, 2006

If it is in range with the old ones, why would I add .010" to each side?

red95gtconvert · May 29, 2006

When I installed my 3.73 gears last weekend I just reused the .030" shim that was on the old 2.73 pinion gear from the factory and it worked perfectly. I ended up with .010" backlash and have no whining or funny noises. Make sure you use red loctite on the pinion nut to prevent it from backing off on you. If this is your first gear intsall I wound set aside a couple days to do it and work slowly.

superhuaman · May 29, 2006

Repostyle said:
If it is in range with the old ones, why would I add .010" to each side?

If the old ones work, you just use them...
But if they're too big, you have to start with smaller ones to get the backlash right.
When you add .010" per side after backlash is set, that sets proper carrier bearing preload.

red95gtconvert · May 29, 2006

Just remember that when you shim the carrier to move the ring gear over you add a shim to one side and take way that size shim from the other side. If you are using Ford racing gears it's really not that hard to install the gears, it's just time consuming.

Repostyle · Jun 1, 2006

red95gtconvert said:
If you are using Ford racing gears it's really not that hard to install the gears, it's just time consuming.

That's why I got the spare rear end, that way I can rebuild and upgrade it on the bench and still drive my car till it's done then just do the swap.

Thanks for the help guys.

superhuaman · Jun 2, 2006

Repostyle said:
That's why I got the spare rear end, that way I can rebuild and upgrade it on the bench and still drive my car till it's done then just do the swap.

hey thats what i did, it worked great...
of course, i upgraded my 7.5 to an 8.8, so i kind of had to do it that way lol.

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