928 CV's

[tripicana]

what type CV is on the 928? are they the same as the 924/944, or 930?

[vdubr928]

It's a Mercedes part. Any direct crossovers guys?

[ROG100]

928 part numbers and different for MY's. 77 to 81, 82 to 84 and 85 to 95.

[destructo_low]

I have confirmed that the 930 joints do fit on the early 928 half shaft with cv joints that bolt up at both ends. It also will fit the cv axles from 1981-1984 with one welded on cv joint. It may also fit the 1985-1995 axles, but the cv joints have a different part number, so I'm not entirely certain. Keep in mind, I do not have these installed on my car. I have slipped the joint onto a shaft to make sure it fit, and I have examined each part side by side.

There are two differences in the 1977-1984 928 and 930(930 332 034 00) cv joints. The depth of the 930 outer cv body is 3mm thicker in the axial direction, and it is 2mm less in diameter. It is 108mm outside diameter instead of 110mm outside diameter.

The bolt circle and bolt diameters are the same. 94mm bolt circle X 10mm bolt.

The spline count and shaft diameters are the same. They both have 28 splines. Crest to crest across splines is 29mm, and trough to trough across the splines is 31mm. The spline length is 28mm.

I don't believe the extra 3mm of thickness is a problem. The joint can plunge a decent amount. The Porsche part number is 930 332 034 00. I bought mine off eBay. It is made by Meyle. Meyle part number 423 43003 500. The auction shows that it includes the boot and various hardware. Mine did not come with anything but the cv joint and a tube of grease. I'm getting in touch with the seller to remedy that and make him change the auction picture.

[Pete R]

I also believe that there is a difference between abs and non abs cars as well

[Danglerb]

What am I missing here, why not use the correct parts?

[tmpusfugit]

Originally Posted by Danglerb

What am I missing here, why not use the correct parts?

The simple answer is price.... the 930 parts are not nearly so expensive as are the 928 parts. Why that price disparity exists is a whole new discussion...and that has to do with the 930 parts being originally from the VW bus transmission and drive line IIRC.

[JK McDonald]

Wow - 930 parts are cheaper than 928 parts ? After a few years of ownership, one of the reasons I sold my 930 was the galactic cost of keeping that beast running right and on the road. Normally used and remanufactured 928 Porsche parts are priced reasonably and plentiful.

It is not that a half shaft can not be swapped around between cars. But what may seem like a minute or unimportant variation in the diameter, width, number of splines, etc….. between the CV joints used on each Porsche model - the differences are there for a reason. Every engineering department must convince their tightfisted bean counters that even though a specification change will add to the manufacturing, labor, material and inventory costs, they are necessary.

CV joints do require service - especially if a car has had a hard life and the half shafts are not inspected regularly. I once offered to look at a neighbor’s car that was making an incredible clunking sound. The noise turned out to be an exposed outer CV joint that had worn all the ball bearings into the shape of dice.

Just from my experience, I’ve found that if you keep the rubber boots intact, full of the approved grease and tightly banded on each end - they will be pretty much be trouble free.

Good Luck, Michael

[tmpusfugit]

Originally Posted by JK McDonald

Wow - 930 parts are cheaper than 928 parts ? After a few years of ownership, one of the reasons I sold my 930 was the galactic cost of keeping that beast running right and on the road. Normally used and remanufactured 928 Porsche parts are priced reasonably and plentiful.

I didn't say all 930 parts are cheap. The point of the OP was he bought a 930 intended aftermarket part (new CV joint, boot, grease and clamps) with a buy it now price of $38.05. The current price for a new early 928 Porsche axle is $641.00, and the later models are not available new, if I am reading correctly. I have not found just the 928 specific CV part itself from Porsche.

Rebuilts cost $249 plus core. I am curious of the rebuilds have new CV joints on both ends, or if they are just flushed out, checked, and relubed, new boots added, and then sold? I don't know, and it is not necessarily germain to this thread anyhow. But, if you can solve your cars problem for $38.05 is there a reason to spend $249 or $641? Some folks will decide yes, I want to keep my car "correct" whatever that is. Others will go for the cheap solution and may incure problems later, or they may work fine....by the way, the retail price for the entire VW bus axle assembly is $189 locally, and while I have not measured it the one at my local VW vendor looks very much identical to my '81 axle. And no, I am not going to measure it and argue over a few 10ths here and there and if it will or will not work...it is just an observation and a bit of a cynical comment as to Porsches spare parts pricing formulas...

[JK McDonald]

Hey Tmpusfugit, $640 for a 928 axle - Yikes. I am with you on the CV joint rebuild kits. Often times there is no need to replace a half shaft. If a disassembled CV joint is found to have no damage to the wear surfaces you can simply clean everything up, reassemble the CV joint using the original components, repack the assembly with the supplied grease and band up the new boot.

Michael

[tmpusfugit]

this is the eBay $38.05 kit. No affiliation with the seller....if it is as the OP says, same bolt circle, 3mm thicker and 2mm smaller diameter, all else the same, it might be worth the effort....on some, maybe the earlier CW assy's that do not have the axles included? I also have an '85 and '84 assembly that this looks like it could be used to replace the transmission side joints if required....but I don't really need one at the moment anyhow....

[Sapientoni]

If there is only minimal pitting on the pressure side of the joint, I have put new correct diameter balls in or used the old good condition balls and swapped the shaft end for end, placing the pressure on the coast side of the joint where there is no damage. Examine the balls carefully for signs of impending "spalling" and replace if necessary. Remember to torque the bolts.

[Landseer]

This is an excellent find!!!!!!

Thank you for this.

The 928 replacement inner CV's were $150 EACH last time I checked.

Nice work. Having rebuild 6 sets of CV's --- with some compromises as noted just above, and bought one set of NOS axles, this is one for the notebook.


I'll try it on the next early rebuild.

I also noted that 964 axles looked very similar (rear ones on this AWD car). Very expensive axles, I think welded on the outers, replacable on the inners.
Next time I'm under our local 964 race car I'll take more notes.

[MPDano]

Originally Posted by tmpusfugit

this is the eBay $38.05 kit. No affiliation with the seller....if it is as the OP says, same bolt circle, 3mm thicker and 2mm smaller diameter, all else the same, it might be worth the effort....on some, maybe the earlier CW assy's that do not have the axles included? I also have an '85 and '84 assembly that this looks like it could be used to replace the transmission side joints if required....but I don't really need one at the moment anyhow....

That's a nice looking kit there. Anyways, can't beat that price.

Landseer, hurry up and try it

[Danglerb]

Just flip them, changes the wear pattern and good to go another lifetime.

Also this is a double bad;

Aftermarket.
930 part.

[Pete R]

Nice kit but what do you do about the outers?