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Old 01-11-2019, 12:51 PM   #1
ford35lh
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Default Limited slip diff.

When did Ford first offer limited slip differential ???
Or,whatever Ford called it ???
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Old 01-11-2019, 01:05 PM   #2
JSeery
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Default Re: Limited slip diff.

No idea, but my 67 mustang with a 9in had a limited slip (not sure for the correct term).
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Old 01-11-2019, 03:38 PM   #3
flathead4rd
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Default Re: Limited slip diff.

Also the 8 inch rear had limited slip. I think a slang term for them was a POSI. I'm looking for one but most are quite expensive.

Last edited by flathead4rd; 01-11-2019 at 03:39 PM. Reason: Update.
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Old 01-11-2019, 03:47 PM   #4
Flathead Fever
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Default Re: Limited slip diff.

1965 Shelby GT-350s had Detroit Lockers. It was an option on the '66 GT-350s. The guy that bought my '66 GT-350 was too cheap to pay for one. I don't know about the Fords? Maybe some of the earlier 4x4 pickups had them?
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Old 01-11-2019, 03:56 PM   #5
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Default Re: Limited slip diff.

Quote:
Originally Posted by flathead4rd View Post
Also the 8 inch rear had limited slip. I think a slang term for them was a POSI. I'm looking for one but most are quite expensive.
"Posi-traction" was the term used by General Motors; it may have been copyrighted, not sure. Dana Spicer may have been he first to build a limited slip, and Studebaker among the first to offer it.
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Old 01-11-2019, 04:21 PM   #6
JSeery
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Default Re: Limited slip diff.

This is what I can find online. 9 inch Ford axles date from around 1957. Ford used two types of locking traction systems, the early system being called Equa-Locks and the later units were referred to as Traction Locks. I couldn’t find any specific first date for the use of the Equa-Locks, but there are examples in 64. They were used maybe as late as 69. Some later 67 vehicles seem to have used the Traction Locks. Traction Locks were used after this time period.

Ok, Edsels started using the Equa-Lock in 1958, Ford Passenger Cars in 1959 & Mercurys in 1958.
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File Type: jpg Equa-Loc Rear Axles.jpg (144.5 KB, 23 views)

Last edited by JSeery; 01-11-2019 at 04:44 PM.
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Old 01-12-2019, 11:43 AM   #7
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Default Re: Limited slip diff.

Good info from J. If still in doubt, I'm sure Vinny's girlfriend could tell us
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Old 01-12-2019, 04:48 PM   #8
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Default Re: Limited slip diff.

Most of the more popular rear axles can be fitted with a limited slip differential set up but they do tend to have a limited life time as well. The clutch packs wear out and have to be replaced. There are some set ups that last longer than others but they likely cost more too.
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Old 01-12-2019, 05:04 PM   #9
Ford Freak
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Default Re: Limited slip diff.

I believe it was " Traction Lok " .
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Old 01-12-2019, 06:34 PM   #10
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Default Re: Limited slip diff.

Just weld up the spiders........what could possibly go wrooooooong ?
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Old 01-14-2019, 07:06 PM   #11
ford35lh
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Default Re: Limited slip diff.

"weld up the spiders"
*********************************
Isn't that what they did in the days before limited slip
to get better/more even traction ???
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Old 01-14-2019, 09:05 PM   #12
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Default Re: Limited slip diff.

Good info from J. If still in doubt, I'm sure Vinny's girlfriend could tell us


Is that your cousin Vinny?
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Old 01-14-2019, 09:50 PM   #13
1948F-1Pickup
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Default Re: Limited slip diff.

1957 was the introduction of the 9-inch. The next year they debuted the carrier that took plates...... the limited slip setup.
I have 58 guts inside a 69 pig in my 68 Mustang.
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Old 01-14-2019, 10:20 PM   #14
JSeery
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Default Re: Limited slip diff.

Quote:
Originally Posted by Charlie ny View Post
Just weld up the spiders........what could possibly go wrooooooong ?
Charlie ny
Man are they hard to move around on pavement by hand! Especially with rear tire stagger!!
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Old 01-14-2019, 10:46 PM   #15
Jay in Mass
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Default Re: Limited slip diff.

I believe that it was 1959.
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Old 01-14-2019, 11:03 PM   #16
JSeery
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Default Re: Limited slip diff.

Quote:
Originally Posted by Jay in Mass View Post
I believe that it was 1959.
Did you see the manual page I posted in #6? It list the years, Ford was 59, but Edsel & Mercury was 58.
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Old 01-15-2019, 12:09 AM   #17
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Default Re: Limited slip diff.

Can't speak for Ford but I know my 59 IHC pickup has a locking differential with the tag on the dash indicating "Power-lock differential) It took a special fluid for refill too. I think I still have a can of it here. A Chryco product. I found the power lock differential to be a little "squirrely" on muddy roads. It would spin both wheels and that tended to push the truck in directions I might have been intending to go. I recall one episode of sliding off the muddy road and shearing the top off a big anthill before spinning back onto the road and resuming my journey.
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Old 01-15-2019, 12:42 AM   #18
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Default Re: Limited slip diff.

My 62 Continental convertible has it.
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