Sending out S.O.S someone please help

[Jim Sims]

Get your CV joint/axle assemblies right here at Pelican Parts.

[dynevahn]

problem is, its a 1979 911sc body with a 3.3 930 engine. Im not sure what cv axle I need. Any way to find out?

[Joe Bob]

It's the body and trans that dictates which CV to use....

[Grady Clay]

Is the car an original ’79 930 with a 915 5-speed replacing the 930 4-speed or is it a ’79 911SC retaining the 915 transmission with a 930 engine? There is a very significant difference in axle assemblies. The first three numbers in the 1979 VIN are 911 for an SC and 930 for a Turbo. With the ’80 models the numbering system changed.

Best,
Grady

[dynevahn]

79 sc with 915 tranny and 930 upgrade engine in it. I will order cv axles for the 79sc.

[Grady Clay]

Good, we resolved that potential ordering problem.

Another issue is the size of your CV joints. What size Allen wrench fits the CV bolts? It will be either 6 mm or 8 mm. How many bolts through each CV joint? It will be either 4 or 6. Does the outboard CV joint have bolts?

How many miles on the car? If many, you might consider replacing both axle assemblies. With a 930 engine (pretty spectacular upgrade) they see far more torque. That is why 930s have the big CV joints and that huge 930 transmission. If you have 100 mm CV joints, you should seriously consider upgrading to the big 108 mm 928 axles used from about ’84 on. They are the same size as the Turbo CV joints.

Regardless, you should order a full set on new CV bolts. That includes new OEM Schnorr Safety lock washers. The proper term for the CV bolts is “Socket head cap screws.” Your CVs take a gasket between the flange and CV joint. Do the replacement axle assemblies use the gasket or do they have end caps?

While the axles are out, confirm that all the plate washers are under the bolts.

If the new axles have end caps, make sure they seat properly to the flanges at the transmission and stub axle with no interference.

When assembling the axles pay particular attention to the length of the bolts. They should penetrate the flange 1-2 threads with 1 ˝ as ideal. There are varying thickness of CV joints and of the metal retainer for the rubber boot. Additionally the end cap adds a little thickness.

This is about a 2-hour thread but very worthwhile on this subject.
Pelican rcecale, Randy’s classic thread.
”Reconstructing Constant Velocity (CV) Joints”
It might be valuable to print a copy and highlight the important sections for yourself and/or mechanic.

A critical issue is to torque the CV bolts again after about 100 mi of use and at each major service – at least annually.

Best,
Grady

[dynevahn]

thanks alot! I checked pelicans new parts and they have Complete Axle w/two CV Joints & Boots 911 Turbo (1985-89), would that fit? Thanks

[Jim Sims]

Probably not; it is more likely the 100mm standard axle is still installed which could be why it failed. If the car's wheel hub and transmission is still set up for the 100 mm axle you just can't swap in the turbo axles as the bolt pattern and bolt size will not match. I will conjecture you need the 100 mm axle assemblies (923-332-033-02-M60) at $257.52 per assembly and 24 8 mm x 50 mm long bolts per axle assembly (900-067-211-09-M100) plus the joint to flange gaskets (4) and 24 8 mm (S8) Schnorr washers.

However you need to check which axles are installed per Grady"s instructions as the car is not stock and there may have been changes in the axles.

[dynevahn]

I checked and its 6mm. Am i safe to assume to get the non-trubo cv axles?

[dynevahn]

got it fixed over at the 911 shop in charlotte, nc. I broke 5 out of 6 studs going into the axle. Well I feel alot better now.

[Halm]

Yep, Terry is very good. Let him spend a few hours with the car and he will tell you everthing you need to know about its condition.