[chaze]

Diagnosing a problem with a Ford 9"..It's been 8 years since installing the new POSI carrier and gears.

When turning corners it appears that the clutch pack is not gradually slipping because half way through the turn the rear end lurches, sometimes rather violently. I suspect that the clutches are worn and "sticking" but it could be something else.

I drained 4 oz. of oil and re-filled with Ford type friction modifier hoping to resolve the problem but after driving a few miles and numerous corners - no luck.

Any idears ?

 

[driveshaft-texas]

figure 8s in the parking lot until they run you off......
will help work the additive into the clutches , and maybe add a second bottle, won't hurt anything

 

[chaze]

Thank you. Another question for you in case I have to replace the clutches.:

Does a 35 spline carrier require a different clutch pack than 28 and 31 spline carriers. Do you have a favorite source for those clutch packs?

 

[big gear head]

I'm guessing that since this is a 35 spline unit (although I've never seen a 35 spline Traction Lock) that the clutches were set up tight. You can do that in the Eaton Posi, but if you do it in the Traction Lock it will cause the clutches to bind and pop like you are describing. I've had to go back and remove some shim from the clutches some Traction Locks before after rebuilding them because of this. Changing the oil and putting in another bottle of additive will probably help a lot. Putting new clutches in it probably isn't the answer.

Also, Posi is for the Eaton clutch type unit that was installed in the Chevy rear ends. Ford's clutch type unit is a Traction Lock, not Posi.

 

[chaze]

Also, Posi is for the Eaton clutch type unit that was installed in the Chevy rear ends. Ford's clutch type unit is a Traction Lock, not Posi.

You got me. Shoulda used the generic term limited slip to differentiate from a peg leg. Sorry bout dat.

 

[chaze]

UPDATE: Like Big Gear Head said - "Putting new clutches in it probably isn't the answer.

This is a Yukon AG carrier with about 400 track launches - 4.33 gears behind a Muncie 4 speed and a 427 - 3500lb car

p.s. It's a 31 spline vs 35 - so bad memory

 

[jeff swisher]

I was thinking busted spider gears.
I broke those and I am surprised you got that many launches and have not broke them sooner or smoked the clutches.
I had automatics and eventually busted them and when I went real drag racing I put a full spool in the 9"

Just swap in my carrier that is set up with the full spool.