Putting a posi diff in..
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Senior User
Joined: Mar 2011
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Putting a posi diff in..
My friend has a posi diff out of an old ford 8.8 and he was gonna sell to me for $50. How hard would it be to take out my open diff and put the posi in? Or would it be easier to have a shop do it for me? Its a 1991 f150 2wd
Fleet Owner
Joined: Oct 2005
Posts: 20,789
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From: Kentucky
One question comes to mind, what vehicle did the Trac-Loc come from? There is a difference in the number of splines from a car versus a truck. Not the end of the world, but changing them is going to drive up the cost to install.
Next question: How many miles on that Trac-loc your friend is trying to sell you? Typical service can vary between 20-60k miles depending on use/abuse. Again, it's not a show stopper but a Trac-loc rebuild kit is going to cost you more than the price of that differential.
Maybe I should have asked this first: what is your skill level and availability to tools to install this? It's not rocket science but you do need a dial indicator and possibly an assortment of shims to get it installed with the proper backlash. It's pretty rare you would need to reset the pinion depth.
Next question: How many miles on that Trac-loc your friend is trying to sell you? Typical service can vary between 20-60k miles depending on use/abuse. Again, it's not a show stopper but a Trac-loc rebuild kit is going to cost you more than the price of that differential.
Maybe I should have asked this first: what is your skill level and availability to tools to install this? It's not rocket science but you do need a dial indicator and possibly an assortment of shims to get it installed with the proper backlash. It's pretty rare you would need to reset the pinion depth.
Fleet Owner
Joined: May 2009
Posts: 21,437
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From: Gilbert, PA
To the OP. If you are asking how to do it, then it is over your head. This is not something you can learn to do by reading a book, or by reading over the internet. It is learned hands on
Differentials need to be set up just right, if not they will tear them selves apart in a few 100 miles. And like other have said. Unless it cam out of a brand new truck, it is most likely worn out
Differentials need to be set up just right, if not they will tear them selves apart in a few 100 miles. And like other have said. Unless it cam out of a brand new truck, it is most likely worn out
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