Video

[Ezra]

Not sure why posi didnt work...

[Richie O]

My posi is real good that way. I have never had that happen. It sure acted like a open diff. Maybe you came on it to softly to get the clutches to grab.

[dragrdan]

If it was easier to overcome the posi's resistance than it was to over come the drivers rear brake it will do that. Notice the drivers tire started spinning when the brake was released.

[DTanklage]

Notice the drivers tire started spinning when the brake was released.

it did?

how did you see that thru all the smoke?

lol

how many miles have you driven since adding some super secret posi juice?

you have to add a bottle of that stuff every 10-15k or the posi will start slippin. once it starts slippin it dont take long to burn the clutches out of it. once the clutches are burnt out of it you get exactly what you saw in the video

[dpuckett]

Maybe your rear brakes arent adjusted evenly?

All the Dana70 posis I've had in the past would turn into a spool when the clutches wore out. The only thing I can think of would be that you somehow got too much friction modifier in there (3 bottles?), or the left brake was holding more than the right.

Daniel

[Ezra]

Anybody on here think it sounds funny? like too much timing? Everybody on DTR seems too think soo.

[DTanklage]

All the Dana70 posis I've had in the past would turn into a spool when the clutches wore out.

Daniel

how could a limited slip unit do that dan?

plz explain

[dpuckett]

The clutches in the carrier lock up, and then both sides spin at the same speed, not allowing for cornering. Very simple to see if one has ever had the carrier apart.

Had it happen on me with a loaded trailer coming from Estes Park to Loveland CO one afternoon. Popped and lurched around every curve.

Ezra, dude, you need a LOT more air.

DP

[DTanklage]

The clutches in the carrier lock up, and then both sides spin at the same speed, not allowing for cornering.


DP

and if you had it apart and forgot to put the clutches back in it will work like a spool?

i dont think so...

[dpuckett]

No, you didnt smell what I was stepping in.

The clutches are supposed to slip some around corners, and grab when the difference between the sides passes a certain amount. Now, you wear the clutches down, removing the slip, and you get a spool. This happens in the course of normal wear/ too little friction modifier, everything still assmbled. Like what happened in my first CTD, and the last auto I had last spring (though I recogninzed the symptoms much earlier, and had to replace only the clutches and bearings- no gear damage).

The part about taking it apart was IF you have taken one apart, you'd see what I was talking about. The Dodge D70s are the only diffs I have experience with, so excuse my ignorance of "normal" limited slip operations, if they are different from the Dodge versions.

DP

[DTanklage]

so you are saying the clutches that allow slippage around a corner are not the same clutches that lock it up when you are trying to do a burnout?

how many clutch packs were in the carrier you took apart?

lol

i have not had one apart

the ring gear still spins the carrier right?

what makes the axles turn?

not the clutches?????????

only reason i am still arguing is cuz i have had lots of other models apart

and cuz i have a little bit of common sense

make it a great night!

[dpuckett]

The clutches that allow minor slip around corners ARE the same ones that lock up when one wheel slips. Apparently the D70s are different from the others. I believe there are 3 clutches and 4 friction plates in each side of the carrier, outboard of the side gears.

DP

[KTA]

The clutches work off the coefeccient of friction. If the linings are worn off and they go to steel on steel they start to chew each other up. That RAISES the coeffecient of friction therby making it harder for the spider gears to turn opposite of each other. That is why a worn out Dana can become grabby and lock up harder than a freshly rebuilt one. I hope that explanation helps.

[DTanklage]

that did help...

so, why did dudes truck look like a peg leg????????

[KTA]

Maybe it is an open diff?? Anyone checked to see whats in there or at least looked at the Build sheet, or is it just "assumed" to be a track-lock.