James Bailey

nope your 03 box is located differently on the rear crossmember and uses a different length torque tube...1978-early 1980 are 03 trans so later boxes are not plug and play...

sweet928

Thanks. Next question. I've always wondered if my diff is a lsd or not. Some time she slides sideways some times not. Never had the chance to lift the rear and spin a tire to check. I thought most OB's were LSD but my car is light on options except full leather dash. LSD doesn't appear anywhere on my Window sticker either. If my lsd is worn, how much in labor and parts to repair? If not lsd, how much in labor and parts to swap out?

James Bailey

the clutches for the limited slip are about $320 for the 4 for the tight 80 % slip, used slip is $500 plus minus... putting it in the trans 200-300 depending on labor rate.
best thing is jack it up and see what it does...cost nothing

Landseer

LSD is worth weight in gold when driving on ice or on loose gravel.

Mine didn't seem to have much resistance in the garage test, but are just right on slippery surfaces.

Our non lsd car just spins one wheel and goes nowhere

sweet928

IIRC in previous threads, the light 'em up test is the easiest test. On a flat surface I spun the tires many times and always get sideways. However on turns the *** doesnt always come out. Maybe 50% of the time only one wheel spins. Might even be more so on left turns then right. I assumed tired lsd, but others claimed that a regular diff will sometimes act this way?! Goes against what I thought but there's a thread here somewhere saying that. If the parts are all available and under 1k is the cost than I'll get it R&R'd this spring. Love getting her sideways!

Is this a transmission job for a transmission specialist? Or a job for my trusted 928 mechanic?

oups59

Should cost some $$$ to ship it to California ....

James Bailey

only weighs a bit over 150 lbs....plus crate/box. Not too bad really.

James Bailey

The open diff with the spider gears have enough internal friction to spin both tires when they are near equal traction so two black lines does not mean it has a slip. Having one tire spin on a turn where the inside is unloaded may mean it is an open diff or simply that the limited slip friction discs are nearly worn out.
Swapping out the ring gear carrier/diff assembly should not be a big job but they should know how to at least check the final ring and pinion gear setup.....Porsche tolerances are such that it should be close even with swapped parts.

123quattro

Don't count on an open diff only spinning one tire. My 84 has an open diff and it spins both rears every time on flat ground.

danglerb

Same here, 83 open diff, two black stripes.

Fsharp9

My 84 spins both when I launch it hard with no LSD also

mark kibort

most of the time, you will get one black stripe if launched hard. but occasionally, you will get both to spin.

oups59

So a fair price will be between 2K and 3K.....

GregBBRD

"No syncro issues. Just need to warm up before using 2nd gear."

That is a syncro issue, BTW.

mark kibort

Thats funny!