4S to rwd questions

I'm thinking about converting to rwd. I don't want to scrap the G96.31. I've read what I can find, but the 2wd operation with the .31 isn't clear. If I pull the driveshaft, front transaxle, and front shafts then put in shafts stubs is that all that's required? Or do you need to change the pasm programming to a 2wd code? I'm just a little unclear as to whether the unit will continue to try and shift power to the front. thaks for any info.

Easiest thing is to just pull the driveshaft between the transmission and front differential. But if you pull the cv axles and front differential, you can either reuse your outer CV axles hub parts or buy stubs. I bought stubs and never used them, switched back to the AWD system. Ran around in 2WD for months and felt no difference. it�s a mechanical system, no dme input.

Fyi the stubs r called tension bolts from porsche. I got entire boxter uprights for under $50 each feom ebay. Its the cheapest way to buy them.

The C2/Boxster/Gt3 tension bolts don't fit the AWD front hubs which is unfortunate. You can find conversion tension bolts ($$$) or just use the outer CV joint with the axle removed.

Quotes source post: 19903818

did not know..... is it because of the bearing or the overall difference in the upright? I guess u could convert the entire upright but almost everyrhing must change like the strut and brakes.

I have a new unused set of the stub axles you�ll need. I�ll get a photo tonight if interested.

Quotes source post: 19903085

That's very interesting. Was the 80 lb weight difference significant at all?

Quotes source post: 19904161

That's what I did - converted the entire upright to GT2 units. I think the difference is the upright is wider so the tension bolt is not long enough. Or maybe the AWD inner diameter is smaller so the tone ring won't fit. I can't remember exactly.

Quotes source post: 19903818

This is what I did, and I used new axle nuts from Porsche for the reinstall. My front diff was leaking so I decided just to go with RWD.

These are the C4S spindles/axles/stubs

Does your front differential pass The skip test? @Porschetech3

It would be cool if we could compare the 2. They both use the same wheel hub so the spline would be the same. It looks like they both have a machined surface at the base. Maybe it is the length? Maybe its the tone ring diameter?

Some quick measurements and I found a part number. Cross reference doesn�t bring up much though. Looks like the splines are deeper on the AWD

I believe the tone ring diameter is a lot smaller on the awd setup. The tone ring might be differently located also.

I just completed this on my 997.1 and it was very easy. I bought the stub axels for $180 each. https://rennlist.com/forums/997-foru...l#post19874181 And my write up with the torque specs https://www.ohioperformancesolutions.com/blog Mike OPS

997 is very different. No tone rings for the ABS as there are magnets integrated into the 997 wheel bearings.

I did not know that! Please disregard my axel stubs. Looks like these will work but now its getting expensive.. https://www.rennline.com/996-997-rwd...ZQ5VZWzI00kCSn Mike

I posted this in the wrong thread. About keeping the "4S" parts if converting to a C2. Owner was going to keep parts to convert back to C4 if needed in future. Good Idea. I wanted a C4S, probably for all the reasons Porsche made it that way in the first place. I "passed" on 2 C4S because they had been converted to C2. One had parts saved, the other did not have parts saved. Neither owner would put the car back to C4. WTF, a C4S is "special" in appearance and AWD. IMO, both go together or the value of a C4S drops considerably if converted to C2. YMMV

Yes, I don't blame you however most folks seem to feel it is worth the effort. It may be Placebo. Andre is one of the few individuals who has decided it is not worthwhile and has reinstalled the front drive components. That means one of two things. Either the system is an advantage and therefore he reinstalled it or, it was no different so he reinstalled it for reasons that might include the ones you have stated. Meanwhile, apparently many of the differentials are actually no longer significantly functional and in that case removing it might not seem to make any difference . Our friend PorschrTech 3 , skip, has mentioned a simple test to evaluate if it works or not. One question I would have is if you knew your system was not working would that make a difference in whether you left it installed ? Also , it is interesting that this four-wheel drive system, although less complex and without the associated sensor problems , is not the sophisticated system of the 964 which was derived from the excellent 959 engineering.

Since Im here I will just throw my $.02 in. I've only really noticed the front end when I was on gravel or turning at low speeds. Coming out of corners it would pull through the wheel but not enough for me to think it was diverting from the joy of driving. I cannot comment fully on the difference because the weather has not cooperated here since I removed it. Its not being sold (the car or the parts) so I have nothing to loose. Mike OPS