How Do You Tell When A Limited Slip Diff Is Done

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slyyguy

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Jul 27, 2015

#1

• Jul 27, 2015

• #1

hey ive got a limited slip differential out of an early 80's gt (7.5 inch rear end) i was gonna put it in my 89 mustang. I took it out of the axle it was in and it did not spin. The differential is out of the housing right now how can I tell if its good or not.



Thanks.

 

jrichker

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#2

• Jul 28, 2015

• #2

The 89 5.0 will have an 8.8" trac-lok differential. The 7.5" innards will not work in it.

 

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slyyguy

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#3

• Jul 28, 2015

• #3

My 89 is a lx with a 7.5

 

Mustang5L5

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#4

• Jul 28, 2015

• #4

Well if you have it out of the differential then it's going to be pretty hard to tell If it's toast or not. You'll have to look at the clutches and guess if they are worn or not.

I'd go ahead and rebuild it anyway.

 

jrichker

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#5

• Jul 28, 2015

• #5

slyyguy said:

My 89 is a lx with a 7.5

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I take it that this is a 4 cylinder car or a car that started life as a 4 cylinder car.

 

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slyyguy

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Jul 28, 2015

#6

• Jul 28, 2015

• #6

Still is a 4 cylinder but i am building a 302 (bored 30 over) with 351w heads. What does a rebuild kit consist of and you know sites where to find it?

 

Shakerhood

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#7

• Jul 29, 2015

• #7

slyyguy said:

Still is a 4 cylinder but i am building a 302 (bored 30 over) with 351w heads. What does a rebuild kit consist of and you know sites where to find it?

Click to expand...

If you are building a 302 do yourself a favor and swap in an 8.8 rear.

 

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slyyguy

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Jul 30, 2015

#8

• Jul 30, 2015

• #8

Shakerhood said:

If you are building a 302 do yourself a favor and swap in an 8.8 rear.

Click to expand...

I have heard both ways that the 7.5 will be okay or will blow up but i already have gears and a posi (that i dont know works or not) so im gonna keep the 7.5 and cross my fingers

 

Noobz347

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#9

• Jul 30, 2015

• #9

There is no self respecting 302 that couldn't shatter a 7.5 if it really put its mind to it. hehehe

Even the stock roller blocks made 300 ish ft/lbs of torque. Damned near everything you will want to do down the road, will be simpler if you beef up the rear now.

Pull a whole assembly from the JY if you have one handy.

 

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slyyguy

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#10

• Jul 30, 2015

• #10

the guy i bought my donor car from drove the car 5 years with a 7.5 and im gonna have the same setup besides a slightly bigger carb

 

jrichker

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#11

• Jul 30, 2015

• #11

slyyguy said:

Still is a 4 cylinder but i am building a 302 (bored 30 over) with 351w heads. What does a rebuild kit consist of and you know sites where to find it?

Click to expand...

I bought a trac-loc rebuild kit from www.SummitRacing.com a few months ago, but it was for an 8.8" rear end. The 7.5" kit may be different.

 

mikestang63

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#12

• Jul 30, 2015

• #12

 

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#13

• Jul 31, 2015

• #13

Put any good torque on that 7.5 and you'll shear the teeth right off.


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