Posi??
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Freshman User
Joined: Feb 2008
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From: Bay Area!
Posi??
hey everyone. i have a 82 f-100 4.9 and c-6 with stock gears, i think i read they are 2.72?? correct my if im wrong..i was wondering if its possible to convert it to posi gears from a 87-93 mustang..the 3.07 gear?? and how would i go about doing that? sorry if someone already post something like this
Elder User
Joined: Jun 2004
Posts: 800
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From: Edmonton, Alberta Canada
probably not.
more than likely the rear end in the truck is a 9" ford (or could be a Dana if light duty) and the rear end in the mustang is a 8.8" rear end. totaly different rear ends altogather.
but the 9" rear end is probably the most plentiful rear end and easiest to work on. literaly thousands of cars and trucks out there with the 9" and ratios from 2.5 up to 4.56 from the factory (of course the most common ratios are going to be 2.5 to 3 in cars and 2.73 to 3.5 in trucks).
the only thing you got to match is the splines on the axles. they were either 28 (most common in cars and pre-73 trucks) or 31 spline (hi-performance cars and most 73 and newer trucks, although most 6 cyl and 302's used the 28 spline axles also).
also tons of aftermarket gear sets out there in any ratio you want even up to high 6:1 ratios.
rgds
Mike
more than likely the rear end in the truck is a 9" ford (or could be a Dana if light duty) and the rear end in the mustang is a 8.8" rear end. totaly different rear ends altogather.
but the 9" rear end is probably the most plentiful rear end and easiest to work on. literaly thousands of cars and trucks out there with the 9" and ratios from 2.5 up to 4.56 from the factory (of course the most common ratios are going to be 2.5 to 3 in cars and 2.73 to 3.5 in trucks).
the only thing you got to match is the splines on the axles. they were either 28 (most common in cars and pre-73 trucks) or 31 spline (hi-performance cars and most 73 and newer trucks, although most 6 cyl and 302's used the 28 spline axles also).
also tons of aftermarket gear sets out there in any ratio you want even up to high 6:1 ratios.
rgds
Mike
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Joined: May 2002
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From: Broken Arrow, OK
Originally Posted by mcdonaldm
the only thing you got to match is the splines on the axles. they were either 28 (most common in cars and pre-73 trucks) or 31 spline (hi-performance cars and most 73 and newer trucks, although most 6 cyl and 302's used the 28 spline axles also).
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Freshman User
Joined: Feb 2008
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From: Bay Area!
well the only number i saw was a 10. Heres a pic of it. I was hoping to go the cheap route like goto the junkyard and pull something out. so i would have to find something to fit a 9" and match the spindles? how do i determine how many spindles there are?
Senior User
Joined: Nov 2005
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From: Lathrop, MO
Odd's are good that what you have is an 8.8" light duty axle with 2.73 ratio gears and an open differential. Being an '82 it could be a 9" instead. If your lucky you still have the identification tag on the cover. You can also use the code from the door sticker, if it's still there, to determine which...provided that it's original.
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Elder User
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From: torrington,ct
that looks like a 9inch to me. no bolts on the "cover" because it use's a center section that pulls out the front, just like on truck axles. Pull your axle shafts out, measure, the diameter and spline count. Take a trip to the junk yard, match spline an diameter, count how many turns of input yoke to axles to get your gear ratio, take home and install. to install; remove axles, remove old center section, seal new center section, install center, and install axles.
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Elder User
Joined: Jun 2004
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From: Edmonton, Alberta Canada
look for a tag on the front of the carrier. it is usually attached to one of the bolts on the passenger side. on it will give the gear ratio, locking or non-locking and a code telling what the rear end is. the code will be something like WGM-?? as an example.
go to the following site and go down to the rearend tech article. look up your code and it will tell you what spline count it has. being as it is a 6 cyl truck, i suspect that it is a 28 spline, but a lot of 73 and newer trucks used the 31 spline axles.
another option is just to find a complete rear end from a similiar truck with the ratio and trac loc that you want and swap it.
rgds
Mike
go to the following site and go down to the rearend tech article. look up your code and it will tell you what spline count it has. being as it is a 6 cyl truck, i suspect that it is a 28 spline, but a lot of 73 and newer trucks used the 31 spline axles.
another option is just to find a complete rear end from a similiar truck with the ratio and trac loc that you want and swap it.
rgds
Mike
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Joined: Oct 2007
Posts: 574
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From: Paragould Ar
Originally Posted by 4.9Ryda
well the only number i saw was a 10. Heres a pic of it. I was hoping to go the cheap route like goto the junkyard and pull something out. so i would have to find something to fit a 9" and match the spindles? how do i determine how many spindles there are?
