Philip_g

Had one of the halfshafts out of the car, but then needed to move it forward, so I tried to bump it forward a little with the clutch, but it only applied powerd to the disconnected side, sound to you guys like the clutch packs are done? Or does it not work that way?

RotaryEvolution

iTrader: (30)

if there is enough force that is keeping the clutches from pushing the car forward on one wheel then no, it isn't bad. clutch LSD's have to break free when taking turns, there is about a 150ft/lb breakways force needed to allow one side to slip and one side not to so it is likely the car may have overcome that force and driven the open halfshaft side.

after you get it back together, try a launch and see if one side spins while the other doesn't.

it is pretty obvious when you are running on a peg legger.

Philip_g

oh good.
I thought they'd work like a posi and spin both at the same time regardless. I'll try the grass test once I get a functioning halfshaft, one of the CV joints blew up.

Maybe I'll just dump the clutch and burn it out if once the new clutch is broken in, sounds like more fun

jacobcartmill

iTrader: (6)

in your case, you wouldnt be able to move the car like that unless you had a locker diff.

Philip_g

good to know, thanks guys.
I pulled the thing out of a GTU in the junkyard and just put it in the car today.

RotaryEvolution

iTrader: (30)

only a spool will turn both sides regardless. viscous will slip one side then grip both tires but doesn't wear out like clutch LSD's do. posi works like a clutch LSD, both work together until there is enough force to break one side free, ie. when taking turns.

Philip_g

Just worried me. I don't want to take the thing out again nor spend the 200 bucks to rebuild it.
Now hopefully I didn't mess it up when I put it together or it'll probably self destruct anyway.
the car had clean fluid and was sealed with black RTV, maybe it had been rebuilt prior to me getting my grubby hands on it, never know.

RotaryEvolution

iTrader: (30)

hmm, what year GTU was it? only one year GTU had a LSD: '88

1) it should have a tag on the fill plug stating it is a LSD and requires a special lubricant
2) if you raise the rear wheels off the ground and place the trans in neutral and spin one wheel then both should spin in the same direction.

Philip_g

not a GTU, a GXL I mean, an 87.
it most certainly is a clutch pack LSD.... Considering I took it out of the housing and reinstalled it in a different pinion cover I have been recently up close and personal with the pack.
the LSD fluid tag was gone, oh well.

RotaryEvolution

iTrader: (30)

ahh ok.

Philip_g

that reminds me, need to grab some LSD additive. I threw in regular old 80w90, maybe I'll drive on it a couple hundred miles then change the fluid and add the additive.

RotaryEvolution

iTrader: (30)

add it now or it won't last a couple hundred miles. once you service it it should be good for about 20-30k miles before it needs to be serviced again depending on your driving habits.

Philip_g

I want to change it out after a short interval in case any crap from the garage got stuck to the greasy parts while I was assembling it. I'll pick up some additive tomorrow anyway

jacobcartmill

iTrader: (6)

go do some 2nd gear donuts and see if the outside tire is spinning.

RotaryEvolution

iTrader: (30)

better safe than sorry, it isn't called friction modifier for nothing, if it isn't in there the discs will overheat and chatter and not grip properly or at all.

Philip_g

I may just run it around the block or up the freeway a few miles then change out the fluid. I'm paranoid some kitty litter or something snuck in there, then I'll add the GM or Ford crud.