Look what happened! Need some opinions!

[86 regal]

Going to the drag races last weekend at Grove Creek, (just to watch), took the regal, i let off the throttle to turn into the place and the rpm's dropped like i had no transmission! I shifted down to 1st and still nothing, i coasted out of the way and put it in park and i heard the park pin sound. I got out and looked at the drive shaft and it looked fine. As i walked oover to the passenger side i seen this!!!!

So i got it home and tore it apart and found that the posi was worn and the c clip fell out. So im gonna have to get a new one, I have an auburn gear limited slip now. I was wondering what would be better to get, an auburn gear friction style like this

http://www.jegs.com/i/Auburn-Gear/109/5 ... tId=744447
or a detroit trutrac gear style like this

http://www.jegs.com/i/Detroit-Locker/35 ... 9/10002/-1 Any input would be great. they are about the same price, i would probably get the better auburn if i picked that style. what are the pros and cons of each?

 

[jrm81bu]

The c-clip shouldn't have fell out due to a worn posi. The center pin(or pinion shaft as its labeled inn your first pic) keeps the axle from pushing in far enough to let the clip out. Look for excessive wear on that pin or a broken spider gear. Upon looking again, maybe its possible to have enough room for it to come out if the side gear can get pushed back far enough from the loss of friction material but I've never seen it happen that way. Anyway welcome to the junk rears these cars came with. If you can afford it go with the true trac, or better yet upgrade to an 8.5, 12 bolt, or 9in instead.

 

[Oldsmoletick]

That's happened to me a couple of times, last time my car hit second under hard accel which caused the carrier to basically grenade inside the housing. Wasn't pretty when I opened it up , carrier was in pieces. Good thing you caught it before the axle completely made its exit (have had that happen too), not pretty for the car.
I agree, rather than sink $600 into the 7.5, upgrade to a little better rear if possible.

 

[joe_padavano]

There's a reason why they sell C-clip eliminator kits....

 

[johnny79]

I was about to pull the trigger on the auburn myself. Are the Truetrac's that much better?

 

[FE3X CLONE]

I was about to pull the trigger on the auburn myself. Are the Truetrac's that much better?

Yes. There's nothing to wear out. At least not in terms of friction material.

Although I've had Auburn's in the past and didn't have any problems with them, I know a lot of guys that hate them. But then most of them are drag racers, which I don't believe the Auburn is really setup for.

I've also heard the same of the True-trac. It's more of a autocross/road race style differential but can't take the punishment of a hardcore, sticky tire dragstrip launch.
My brother has one in his '02 Mustang GT and it holds up fine with drag radials. He has a 5 speed and is running low 12's @ 112-114mph.

 

[86 regal]

The cone was so wore out that the spider gears were really sloppy and it came out between the spring retainer and spider gear, I was actually going to get c clip eliminators last fall and kinda just forgot about it. I really want a 12 bolt but thats a lot of money for me right now considering i hardly drive the car and when i do im pretty nice to it except for a donut here and there, i think i'll go with the trutrac, thanks for the input!

 

[johnny79]

According to the jegs site, that's not going to work on my cutlass 1979. Any clue why they would say that. I know I have a 7.5 10 bolt 26 spline.

 

[86 regal]

I don't know of any difference. im sure they just dont have it listed, summit doesnt list any years at all http://www.summitracing.com/parts/DTL-911A319/

 

[Pontiac455]

Look for a 8 3/4 out of a B body dodge or plymouth the housing is 52 inches from plate 2 plate. Set the rear houseing up in a jig take some measurements and weld in all the brackets. Set of 391's and a sure grip and u'll never break that one.