924Board.org

Martijnus · Joined: 29 Dec 2006 Posts: 2019 Location: Netherlands

yeah... I'm pretty sure that welding your diff causes enough stress on the axles (from diff to wheel) and thus CV joints to break them when you corner the car... so not when you're drifting it.

I'm sure all you guys know the function of a diff, and what happens when you have a locked diff and you're cornering, so one wheel has to travel a larger distance then the other.

Somewhere this difference has to be caught... what the diff normally does. There are several options:

- the tyres/wheels compensate for the difference by sliding on the underground, in whatever way
- the axles take the fall and snap
- the cv joints take the fall and snap
- the diff weldings take the fall and snap, making your car handle a lot better for about 1/12th of a wheel revolution.

Anyway... some guy locked his differentials on his 4x4 and started to drive in circles on a parking lot, with tarmac... guess what snapped... his axles.

In muddy terrain (or whilst drifting) the difference can be handled by the slip of the wheels themselves... but when you've got grip, you're in deep.

I'd like to hear what's wrong with my reasoning, and what happens to the forces when you weld your diff and take a corner.
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"Rule: Turbo's make torque, and torque makes fun." (C. Bell)

924 "50-jahre", 1981.
MSII/extra, LPG, ITB's, 5lug.
To be turbo'ed in a while.
Killed her at the Nurburgring, Porscheless at the moment

mcadam1121 · Joined: 02 Feb 2008 Posts: 109 Location: wichita, KS

Ok lets see if I guys can answer my ? If uve got a 924 torque tube will it bolt to the 951 tranny I no that it doesn't have the rite size shaft but could u take a 951 or 944 shaft and put it into the tube also will 924 axle shafts bolt up 2 the 951 tranny
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The Ginger
77 porsche 924 Martini

v8carreragts · Joined: 05 Sep 2003 Posts: 665 Location: Tucson, AZ

It will bolt to the TT as long as yours isn't a snale shell. If it has the bellhousing type rear it will bolt on. The shaft size is different. You could have the input shaft from a 925 5 speed swapped into the 951 trans, but you probably would be better off using a 944 TT and a Mustang clutch disc. (correct disc with the 1" x 24 spline)

mcadam1121 · Joined: 02 Feb 2008 Posts: 109 Location: wichita, KS

Ok I found a 944s transaxle will that be up to the job of supporting a v8 and what is the right size and spline count of the shaft on the 944 transaxle I've read that its 1" 23 spline or 1" 24 spline. I thought it was the 23 spline cause I know that my 924 4 spd is 24 spline and I thought they were different
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The Ginger
77 porsche 924 Martini

v8carreragts · Joined: 05 Sep 2003 Posts: 665 Location: Tucson, AZ

The 944 is 1" x 23. The early 924 N/A is 13/16" x 24. The 944S transaxle is not much stronger than the late 924 turbo or early 944. You still will not have a very usable 1st gear. The best choice is a 951 transaxle. It has a 3.375 ring and pinion and 3.5 first gear and the early 944/944S have a 3.88 and a 3.6 first gear.