?Trans Axle? I hate to ask?

[Jeremy]

Morning, I am a big SLC fan and trying to make it my next big project but find my self on a very tight budget. The thing that puzzles me the most in knowing which trans axle to choose. I would to build a SLC for the street with about 450-500hp(using a modified LS1) and I would not use it for a every day driver. I have no interest in taking it to the track just a nice street super car. I tried to read as much as a I can on this forum and the GTM folks and find that the hardest part is finding a affordable trans axle. So what would be a good option for me, G50/01 or a 930? Any help would be greatly appreciated and if this has been posted already please point me in the right direction. Thanks for your time.

[Doc Kaler]

Hi Jeremy,

and welcome to the Forum!

All of us have struggled with the same question when planning our SL-Cs so you're not alone. Both transaxles mentioned will do a great job at the HP and driving style you are considering. I believe the 930's are more plentiful and may be less costly overall to ready for mid-engine use. There has been some research on using the Cayman transaxle. These can be had new, are mid-engine ready out of the box and can handle that HP as well. I would suggest PM or email Erik at GBox for some technical help and pricing of Porsche transaxles. A Ricardo would be a higher HP choice and Fran has these "in stock". It might be a little "much" for your intended use. You won't need LSD so that saves a chunk of money. I might still recommend an oil cooler though.

That said, don't short change your selection. The transaxle has a lot going on inside!

Lastly, where in Texas? I'll extend some TX hospitality and invite you to visit if you live close enough to DFW area.

Doc Kaler

[Cam]

Jeremy;

There seems to be a glut of ricardos on the market right now bringing the price down. i guess it's because the Ford GT is out of production. mine came in a lttle less than the G50 i was looking at. Maybe we can get a Texas SLC Club going!

[Alex]

I went with the Ricardo unit because it can handle a crap load of power and is incredibly reliable. Not to mention it's cheaper than a g50x that's been built up to handle a lot of power.

These are not going to be cheap cars to put together - I'd guess most builders will be spending between 80 to 120k when all is said and done, so since the transaxle is a critical point of the build, use a solid unit that will last and will be able to handle the v8 torque w/o missing a beat. (my understanding is the weak point of the porsche units is the torque issue)

[Jack]

I'm using an inverted 930 LSD unit in my build. Got a really good deal on a freshened unit. Erik Johnson at G-Box was a great help when it came to adding oil pump and cooler, etc.

[Tom]

What (if any) mods are done to the synchros on 930 boxes? I drove an old 4 spd turbo Porsche a while back and found the 'box pretty vague in its shifting.

Just curious, as I already have another Porsche 'box.

TIA

[Brian Hamilton]

Sweet, another Texas guy!!!

[Jack]

Tom, I have all new stock syncro's in mine so we'll see. At worst, should they wear, it will shift more like a "dog" box. With the Brentwood cable shifter, the vaugeness should go away (I expect).

[Alex]

Originally Posted by molleur

I'm using an inverted 930 LSD unit in my build. Got a really good deal on a freshened unit. Erik Johnson at G-Box was a great help when it came to adding oil pump and cooler, etc.

If you don't mind me asking, how much did it cost you? When I was looking at the 917 (which needed a 930), I believe carquip quoted me around 10-12k for an inverted, rebuilt and strengthed box with all the goodies (cooler, etc....)

[Jack]

Alex,
I paid $3900.00 for a fresh rebuild from a reputable shop and installed the cooler fittings myself. Really lucked out with this one. I'd expect to pay somewhere from
8-10K otherwise for the same thing. It is an LSD unit too.

[JD Doshti]

whats it like using a 4 speed??

[Jeremy]

I would like to thank every one who chipped in with great advice. I have found a few units on ebay that are used and with out a doubt need a overhaul. Since I do not plan on more than 500hp, would a overhauled unit with a cooler be good enough?

Doc, I live in Troy, Tx only a few hours away and I will take you up on that offer as soon as I return from Iraq. I am a contractor and will be in town some time in March if that is ok? Once again, Thanks to every one!

[Jack]

Jeremy, should be..
JD, not on the road yet. Ratio's appear to be just right though.

[Doc Kaler]

Jeremy,

PM me when you return to make sure I'm not in Cabo at the time. I'll be happy to have you come here to take a look at my SL-C. Hopefully by then you'll actually see some progress!

[Jeremy]

Thanks Doc, will do!

Molleur, I like the details in your build and sent you a pm.

Every one Thanks alot for your advice, I spoke with Erik @Gbox for options. Very polite guy and gave me good details. Thank you Erik for taking the time to answer my questions! Geee! You guys are awesome!

[Ben Whittle]

Just to throw another couple in the mix check out the ZF-Q (not the ZF) and it looks like there is a new one out by FFR for use with their GTM but you can buy it separately....

[Erik]

Happy to help you with this. Let me know if you run into any additional questions. I am always here to help. Feel free to call my cell too if you should ever have a problem reaching me.

Warmest Regards,

Erik Johnson
(303) 440-8899 work
(303) 895-4828 cell

[Erik]

Hey thank you all very much for the kind recommendations to give me a call. I really appreciate working with all of you, and it is nice to know that everyone has been satisfied with the service I provide. Nice to be recognized.

Thanks again,

Erik Johnson