...about the same difference between ******* and urinating. The mechanics between the different brands may not be indentical, but they achieve the same end.
Only on paper. The Ford TracLok will hold posi on my 9" wide street tires but I have a choice of bog the motor of spin one wheel in first gear with the 10" Hoosier Quicktime Pro slicks. The Detroit locker is noisy but it locks the slicks no mater how I launch.
The first year that ford used a posi style rear end was 59, it is not as strong as the latter 60's style. I have heard that old argument for years that 57 fords are not true 9 inch. Every thing fits and it is easier to say it is , so the chevy guys can tell it trom a dana, or a 56 ford 8 inch. Which is probuley not realy a 8 inch. Tom
You only need to have been exposed to all of these to shoot holes in that statement. Meaning, they don't ALL achieve the same end. Splitting hairs? Depends on you perspective. Races are won or lost with as little as 1/1000 of a second. Frank
I think the first clutch-type diff that ford made was the Equa-Lock. It's spring pre-load was a bellville spring washer. Later, the Traction-lock diff came out. It's spring preload was four small coil springs. The spring preload kept the diff (side and spider gears) from operating untill clutches would start to slip or (overcome) the clutch preload, allowing power to be aplied to both axles. Detroit locker should never be mistaken with the above. It was a splined coupler, spring-charged mechanical rachet style. Sorry for bad spelling.
Sorry, I didn't know we were discussing which limited slip setup a street driven hot rod would need in order to win the Winternationals this year.
That one doesn't even require an answer . That is an old trick for drag racing but no good on the street . Yes the Trac Lok was Fords . I was pretty sure it only worked when the one wheel broke loose then both wheels would work like a posi . Just was not 100% positive that was it . As for the one with the 9" rear and putting 8 3/4" gears in them , I sent him a site that explained all the different rears , where to find them and so on . Still didn't believe me ! OH WELL all those rear end mechanics and factory's repair manuals must be wrong someplace ! I will stick with the information from the site that I posted ! I know that information is 100% correct ! RetroJim
Ford Equa-Loc [clutch type] locking differential was introduced with the 1959 Ford Edsel and Mercury model year. B9A part numbers. 1957 and 1958 Ford did not yet have a locking differential The Detroit Locker [rachet type] was an over the parts counter part starting with the 1963 427 Ford and Mercurys that had 31 spline axles. Later Ford offered Detroit Lockers for 28 spline axles and for the 8" rears in the mid sized cars and I think they offered a Detroit Locker for the 7 1/4 small car rear. [I never actually sold one] 1966 thru 1971 Ford Mercury and Lincoln had a 9 3/8" rear. These were a very m***ive 9" type that came in 410, 428, 429, 460 cars [not 427] and 390 F-100 hd pick ups. A 4.10 ratio was available in a 390 pick up with overdrive. In 1972 the horsepower and torque was so castrated a 9 3/8" was not needed The Traction-Loc [clutch type] was a improved version of the Equa-Loc which was introduced in 1968. This was available in both 28 and 31 spline applications also in the mid sized 8" rears. C80Z part numbers. The last cars with the 8" or 9" [removable center section] was the 1980 Granada Monark and Versailles series cars. The rear disc brake feature was standard on the Versailles and a extra cost option on the Ford and Mercury. All disc brake rears had 9" center sections. The last truck 9" rears were ***embled Dec 1986 as a production mix with the 8.8" integral rears in the 1987 E, F,U150's [Econoline, F-series, Bronco] Most were 31 spline but not all. With its straddle mounted pinion the 9" Ford rear was possibly the best rear ever for a car or light truck but too expensive to sell in a price war market. I think Timken had a truck rear with a straddle mounted pinion before 1957?? Rudy Sandargus
And think how fast the Corvette would have been if it wasn't bloated. When I drove my dad's "E-Bird" on the last day of high school in 1984 I found out that it didn't have a posi (or if it did it wasn't functioning) cause that 312 would roast one tire (hope my dad doesn't read this).
The Jalopy Journal
