Rear Differential Issue.
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Senior User
Joined: Apr 2011
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From: Union,Ky
Rear Differential Issue.
last week I broke the pinion and spider gears in in rear end. Well Im getting a used rear end rather than rebuidling mine. Does anyone know the gear ratio on the 97 F150 xlt 4.6l 4x4. I figured they would all be the same but my tag is missing on my diff and I was told by an auto parts store that there were a couple different ones. Thanks
Posting Guru
Joined: Mar 2009
Posts: 1,845
Likes: 1
From: Montague, NJ
if its just the gears inside the differential (pinion/side gears) then its relatively cheap. i did mine, which is a limited slip differential so i replace the clutch packs for around $250.
it was 150 for the gears
around 6-70 for the clutch packs (only needed if you have a limited slip)
then of course, $22 for rear fluid and $5 for the RTV. all thats needed is basic tools and a torque wrench if you decide to take the carrier out.
i mean, im only 17, and its not like i go to school for this yet. and i did it in a weekend. its easier then it seems if you have a basic automotive knowledge.
it was 150 for the gears
around 6-70 for the clutch packs (only needed if you have a limited slip)
then of course, $22 for rear fluid and $5 for the RTV. all thats needed is basic tools and a torque wrench if you decide to take the carrier out.
i mean, im only 17, and its not like i go to school for this yet. and i did it in a weekend. its easier then it seems if you have a basic automotive knowledge.
Posting Guru
Joined: Mar 2009
Posts: 1,845
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From: Montague, NJ
you'll need these...
1986-11 Mustang 8.8" Rear Differential Spider Gears 31 Spline Traction Lok at LRS - Same Day Shipping!
one of these...
1986-11 Mustang 8.8" 7/8" Differential Cross Pin, for 31 Spline Applications at LRS - Same Day Shipping!
thise...
1986-2012 Mustang Ford Racing 8.8" Traction-Lok Rebuild Kit with Carbon Discs, M-4700-C at LRS - Same Day Shipping!
and this
CPA5OHtech - Page: 18 of 27
1986-11 Mustang 8.8" Rear Differential Spider Gears 31 Spline Traction Lok at LRS - Same Day Shipping!
one of these...
1986-11 Mustang 8.8" 7/8" Differential Cross Pin, for 31 Spline Applications at LRS - Same Day Shipping!
thise...
1986-2012 Mustang Ford Racing 8.8" Traction-Lok Rebuild Kit with Carbon Discs, M-4700-C at LRS - Same Day Shipping!
and this
CPA5OHtech - Page: 18 of 27
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Posting Guru
Joined: Mar 2009
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From: Montague, NJ
theres only 2 different types of axles. whats listed above is the different gear ratios. if you're replacing the whole axle, then you'll either have a 8.8 or a 9.75. they cannot be interchanged without a different driveshaft.
Postmaster
Joined: Jul 2003
Posts: 2,544
Likes: 2
From: okc
It takes a bit more than just removing and installing a ring and pinion. You have to set pinion crush properly, and the lash as well. If you don't know how to do it, research it up and down before you even drain the diff. If then you feel confident you can do it all properly, then by all means go for it, if not find someone who knows how to set a ring and pinion up properly. If it's not done right you can tear new gears up in a short time. One tip I can offer is upon teardown, keep close track of which sides the carrier shims come out of. It's not extremely difficult job to rebuild a diff, but it definitely has to be done exactly right. Swapping out the whole unit is a bit more "plug and play" as long as the axle you get is in good shape.
Fleet Mechanic
Joined: Jul 2010
Posts: 1,354
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From: Winnipeg
As said above, best to research for this job. Here's a gear install from a 4x4 site that should give insight to the procedure of an install which may help your decision to do it yourself. http://www.pirate4x4.com/tech/billavista/Gear_Setup/
There's usually small shops, they don't have to be speed shops, that specialize in diff repairs that will be far cheaper than using a dealership for parts and labor. Try the Yellow Pages in your area.
Note. this is a dana 60 install, not a 8.8.
There's usually small shops, they don't have to be speed shops, that specialize in diff repairs that will be far cheaper than using a dealership for parts and labor. Try the Yellow Pages in your area.
Note. this is a dana 60 install, not a 8.8.
Last edited by Lime1GT; May 28, 2011 at 08:36 PM. Reason: more info
Fleet Owner
Joined: Jan 2004
Posts: 26,007
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From: Brentwood,CA
The 8.8 is a very easy axle to rebuild not as easy per say as maybe a removable carrier unit like a 9'' is but you should be able to handle the job. You will need a press to replace the bearings and a dial indicator to set the gears and shims. May want to buy an extra crush collar to as you only get one shot with them. Plan on 6 hours for a first timer.
Postmaster
Joined: Jul 2003
Posts: 2,544
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From: okc
I highly doubt he broke the pinion without messing up the ring gear. But either way, replacing the pinion requires the new crush sleeve to be set right, and the gear lash done with a micrometer. If JUST the spiders broke, then it would be a simple spider gear swap.