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Old 03-09-2012, 06:00 PM
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Ford 8" info needed

If you were in a U-pullit junk yard looking for a 8" ford with posi in it which cars would be most likely to have the posi unit?
Also is there a way to tell if they are posi without taking them apart,is there tags on them or something,and if so where are they located?
Is there info telling what ratio they are?
Can any ratio R&P be used with the carrier?
Thanks

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Old 03-09-2012, 06:14 PM
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I scrounged Michigan yards for years trying to find 8" rears. Most are around 2.75 gear and VERY few posi. Look under higher dollar cars. Merc Monarch. Little Lincolns etc..
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Old 03-10-2012, 06:36 AM
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posi's

if u'r lucky nuff to find a rear that off the ground... turn one tire and look at the other... it will turn in the same direction if its a posi... if turns in op-direction its open..
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Old 03-10-2012, 08:02 AM
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As said, Merc monarch, ford granada, pinto, bobcat, mustang II[best bet for a 3.55 gear] however the last 3 use a funky looking housing that reduces from 3"to about 2" at the outside ,the center section is the same, the same powertrax that fits a 9" works in an 8" w/ MINOR modification.

dave
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Old 03-10-2012, 09:05 AM
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If you come across older cars, Mustangs and Fairlanes, cougars etc (small block cars) are also good sources for 8" rears.



As stated the Mustang II (usually V6 and V8 cars) had 8" units, but usually in the 3.00 (4 speed) and 2.79 (automatic) ratios.

If the chuck has never been removed there is usually a tag attached to one of the studs that will indicate ratio.

A few years back I spent a lot of time hunting for a POSI 8" with no luck and bit the bullet and just bought a carrier and had it set up.

There are always a few on E Bay, but usually pretty pricy and shipping can add $75-100 to that. Craigslist is also something to watch (I just did a search on Cl and locally for me there only seems to be one in Tucson) and it's pricy.
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Old 03-10-2012, 09:29 AM
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Quote:
Originally Posted by 2old2fast
As said, Merc monarch, ford granada, pinto, bobcat, mustang II[best bet for a 3.55 gear] however the last 3 use a funky looking housing that reduces from 3"to about 2" at the outside ,the center section is the same, the same powertrax that fits a 9" works in an 8" w/ MINOR modification.

dave
What kind of modifications?
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Old 03-10-2012, 10:30 AM
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The distance between the carrier bearings has to be decrease on the F9 carrier.
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Old 03-10-2012, 10:41 AM
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Quote:
Originally Posted by lmsport
The distance between the carrier bearings has to be decrease on the F9 carrier.
Could U elaborate on that a little more?
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Old 03-10-2012, 12:05 PM
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As stated, with both wheels off the ground turn one wheel/drum and if the opposite side turns the same direction its a posi. If it spins the opposite it is an open dif.
Here is the best resource I have ever come accross for Ford axle information. I've been using it to hunt down a posi 8.8. I have noticed that the tag data will note the exact axle internals, both gear set and open/closed dif. There are 17 pages of ford axles by car year:
Ford Axle Resource
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Old 03-10-2012, 12:44 PM
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WOW,thats a LOT of rears!!!!
THANKS
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Old 03-10-2012, 02:53 PM
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Quote:
Originally Posted by yragat
Could U elaborate on that a little more?
You will need to get a small bearing F9 diff.
The F9 diff carrier is a small amount taller than the F8. I would put the two side by side and on the F8 carrier measure the distance from each step face of the carrier bearings, and measure the offset of the ring face from the center of the bearing spacing. You can duplicate those numbers on the F9 with a lathe. I think the amount to be removed is about 0.150 and it may only be on one side that you have to machine.
I havent done one like that in years since F8 diffs are available again.
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Old 03-10-2012, 04:48 PM
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All I had to do was grind about .030 off the spider gear shaft...

dave

60's mustang ,merc cougar ,ford maverick, ford fairlane ,ford falcon, lot of 60's stuff
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Old 03-10-2012, 05:30 PM
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then do you use the whole 9" punkin?
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Old 03-10-2012, 07:01 PM
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Where did you get the idea that a 9" is involved?

dave
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Old 03-10-2012, 08:22 PM
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when U referred to F8 and F9 I thought you meant Ford 8" and Ford 9"
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