Source for a ZF LSD (915)?

[wicks]

Anyone know a current source for a ZF LSD to fit a 915 gearbox (1973)? Any condition. Thanks.

I think the P/N is 901.332.053.13 but not positive.

[Steve@Rennsport]

The problem isn't acquiring the LSD, the real issue is getting the special LSD flanges needed for those coarse-spline units. Just unobtanium now.

[wicks]

Ahh, wasn't aware of that. So perhaps I should just put in an OSG unit? No axle/spline changes required? Only for normal road use.

[Elombard]

The OSGs are $$$$ aren't they? Have you looked at the Guard options?

[darrin]

I found this recent thread to be both topical and illustrative Should I put Guard LSD in a 2.2??

[Geary]

If you MUST have a ZF, I've probably got the last new ZF 915 housing in existence. I'd have to build it with Guard internals, but that would allow you to use your standard flanges. Not cheap. PM me.

[Geary]

.
OSGs are cheaper, but you pretty much get what you pay for ..

[Matt Monson]

Originally Posted by Elombard

The OSGs are $$$$ aren't they? Have you looked at the Guard options?

If you think a Giken is $$$$, a GT must be $$$$$$

[wicks]

This seems like a no-go scenario. I don't want to change the gearbox or do anything custom...just add the factory LSD option.

Wish it was like sticking a locking diff in the old landrover. Turn a few bolts and presto.

[Raceboy]

Originally Posted by Steve@Rennsport

The problem isn't acquiring the LSD, the real issue is getting the special LSD flanges needed for those coarse-spline units. Just unobtanium now.

I have coarse splined ZF LSD in my 915 that is undergoing a complete rebuild at the moment, could replicate the flanges if they are in such a high demand?
I can make a drawing at least, just a bit of Solidworks.

[Steve@Rennsport]

Originally Posted by Raceboy

I have coarse splined ZF LSD in my 915 that is undergoing a complete rebuild at the moment, could replicate the flanges if they are in such a high demand?
I can make a drawing at least, just a bit of Solidworks.

Sadly, they are not high demand, however its a critical item for anyone needing coarse-splined LSD flanges as they are long NLA.

The key will be making good, relaible parts.

[Raceboy]

I will make the drawing before gearbox gets assembled just in case I may need it some time.

We have made quite a few parts just by making a good drawing and then just have them CNC milled from preferred metal.

[chrolesen]

Hej Væger

I have ZF LSD vit flanger For sale

Vh Ole Olesen
Denmark
pone 004522834567

[Porchdog]

Originally Posted by Raceboy

I will make the drawing before gearbox gets assembled just in case I may need it some time.

We have made quite a few parts just by making a good drawing and then just have them CNC milled from preferred metal.

Just off of the top of my head, I expect the flanges are from forgings and the splines are broached.

I wouldn't consider barstock / "billet" equivalent to a forging for a part like this even if you find the same alloy.

It's not the kind of part you can get from just any machine shop, especially in small quantities.

[Matt Monson]

For quite a while now a used early 915/914 lsd has been around $1500-2000. The flanges are generally $400-500 each. So $2300-3000. A Guard LSD which does NOT require flanges runs $2595. Unless flanges can be made for less than $400 each there's no point.

[Raceboy]

Originally Posted by Porchdog

Just off of the top of my head, I expect the flanges are from forgings and the splines are broached.

I wouldn't consider barstock / "billet" equivalent to a forging for a part like this even if you find the same alloy.

It's not the kind of part you can get from just any machine shop, especially in small quantities.

I know it is not just cut out and done, it has treated surfaces etc. I consulted with specialists, they said it can be done though.

[Matt Monson]

Just to add information for people, the LSD flanges are 61mm to the shoulder, versus 56mm. That's the sole difference

[KTL]

So we're talking coarse flanges with CV "cups" that are 4-bolt (the other two are roll pins) and 108mm diameter?

What if wicks decided to swap axles and install the 100mm axles? Of course he'd also need the associated transmission drive flanges and the stub axles. Only reason I say this is because the 100mm axles are quite plentiful used, as are the flanges and axles.

[group911@aol.co]

Originally Posted by KTL

So we're talking coarse flanges with CV "cups" that are 4-bolt (the other two are roll pins) and 108mm diameter?

What if wicks decided to swap axles and install the 100mm axles? Of course he'd also need the associated transmission drive flanges and the stub axles. Only reason I say this is because the 100mm axles are quite plentiful used, as are the flanges and axles.

Are the 100mm coarse flanges that easy to find?

[KTL]

Well if he replaces the output flanges when he does the replacment diff, he doesn't need the coarse 100mm flanges? That said, I have two sets of the coarse 100mm flanges. I don't know if that means they're rare or common though. Just saying I personally have two.

One set came in the racecar as-bought, which started as a '79 SC but has an '84 915 transmission. Apparently the original '79 SC output flanges were transferred into the '84 trans with the billet LSD it has in it. I think it's one of the early GT billet diffs. The other pair are from a friend's '79 SC, coincidentally, that had a problem with the trans and he needed to replace it. His trans had an open diff. So now that I think about it, I should take a look at the two pair of flanges and see if they're the same dimensions, just to educate myself