Can anyone identify these

 

Not sure what you are asking. Can you clarify a little better?

 

The one in back came out of truck. I put pinion shaft new bearings and this limited slip in and now have taken back out because it wouldn't unlock and was binding up

 

Are they interchangeable? When I got it back out I couldn't turn spider gears. Had very tough time even disassembling

 

Setting up a rear gears is a art that I don't have. If the spider gears in the open section wouldn't turn then you had something shimmed too tight or improperly installed. The spiders in the limited slip won't turn by hand as they are preloaded with the clutch plates. When you say it was binding and not releasing you do understand that they are constantly locked together with the clutches and the clutches are supposed to slip smoothly when going around a curve or corner. What lubricant did you use when you installed the limited slip?

 

I took limited slip from a 10.5 and installed in my open 10.5. I set preload and backlash all that stuff when turning the clutch pack wont slip. It seems like someone added extra shims/plates to keep it locked. It's so tight I cannot get pinion gears back in. What is really confusing is this limited slip says 10.25 on it so I thought I had wrong center but ring gear is the same on both 10.5

 

The 10.25 and 10.5 carriers are the same. It is not uncommon to see 10.25 cast into the early 10.50 units.

I assume when you say you can't get the pinion gears back in, you are talking about the spider gears. I think they have to be "rolled" into the limited slip carrier. I believe there is an "axle stub" that is locked into a bench vise to sit the carrier on so you can roll the spider gears into the housing.

You might need to get a manual that tells you at what foot/pounds it requires to get the clutches to slip. It will also give you the specs on shims and other important issues to setup.

 

Throw a detroit in there or a gear driven locker... LS'S are junk anyway. Did you have the friction modifier in there?

 

Friction modifier is only added after the rear axle is sealed up and you are adding gear lube.

LS's aren't junk. If they were, why are they used in many makes of vehicles (Ford, GM, Chrysler, ETC) and for years since the 1960's....

 

Yes I put additive in it. Guess I am going to put it back together and run it. Not sure why it is not unlocking. will run it until something happens

 

It's not unlocking because the spider gears are in wrong. You now have a full spool and something will blow up spectacularly in quick fashion on the street. You need to set the spider gears properly.

 

Ok, so I am assuming it had same problem in other truck? Because all I did was remove it and install new bearings on outside and pinion

 

The spider gears will always have pressure on them from the clutches so they will be difficult to turn. Clutch type limited slips work by keeping constant pressure on the spider gears to keep them turning at the same speed but still allow some slippage for the wheels to turn at a different speed on a hard surface, they don't lock and unlock like a locker does. If it's chirping the tires around turns then the clutches are shimmed to tight, that won't really hurt anything other than wearing your tires out quicker, I ran mine like that for 6 months before I put my Detroit locker in.

 

Ok, thank you do you know of a shim kit? What about taking one pack out? Worst case it will be open ?

 

You need to find the clearance specs for the clutches and the spider gears. Removing a clutch plate and hoping it will work isn't a good thing to do. As stated above there is a preload on the clutches and spiders. Just because it was bought used doesn't mean it was any good. Maybe you should get back with seller and see if they will replace it.