New Transaxle Option

Nathan

GT40s Sponsor
Hi everyone, Nathan here, proud new forum sponsor! :)

We're looking for feedback on our brand new transaxle, which has a lot of goodies. 6-speed street sequential built for high torque V8's.
It's got a quick change rear end, built in pump, solenoid bump stick shifting (no more cables!), and choice of Eaton Truetrac or ELocker diffs. It's also transversely mounted, so no overhangs and all the gears are packed under the stub shafts for great weight distribution. There are a bunch more features, but those are the ones that come to mind.

Tooling is all finished, and we just started endurance testing 4 boxes. I'm being told retail will be under $15k. All your comments and feedback would be really appreciated!

 
and now we wait to find out if this will become vaporware like all of the other transaxles that were going to come to market ... dun dun dunnnnnnnnnnnnnnn
 

Nathan

GT40s Sponsor
Hi everyone, here's another video:

@Larry L. All the information you can ever want is all downloadable at the link in my signature.

@EFNFAST @Jim B. Yeah, we're a little late coming out with it, we still have to do testing. I don't blame you, there's a lot of vaporware out there. That's why we decided to build our own. We have over $500k in development costs so we are serious about this. To do it right requires the right molding and tooling. These are not sand cast, these are die castings - much more precise and expensive. Same goes for many of the components, including the push-pull solenoid, built from scratch to our specifications.

I'm wondering if I posted in the right part of the forum to get feedback. If you guys have suggestions for sections that might get more views, let me know :)
 

Roger Reid

Supporter
I hope your transaxle is a success. It looks interesting. You probably won't get too much "yea I'm going for it" until you have one installed in a track car and put some successful miles on it. There is a place on this forum that is specific to transaxles.
 

Nathan

GT40s Sponsor
I hope your transaxle is a success. It looks interesting. You probably won't get too much "yea I'm going for it" until you have one installed in a track car and put some successful miles on it. There is a place on this forum that is specific to transaxles.
Thank you for the support, and thank you for letting me know which other thread/forum I can post in. And that's definitely true. I guess we'll have to wait and see until we install the gearbox into one of our own high horsepower cars and hammer it on the track! ;)
 
As of February 2020, these guys will not return calls or answer emails. Their youtube shows the first assembled transaxle was in the fall of 2019.
 
As of February 2020, these guys will not return calls or answer emails. Their youtube shows the first assembled transaxle was in the fall of 2019.
Everybody who builds a transaxle, like Griffin, seems to always have 1 unit and that's all that ever makes it to the light of day.
 
I did get an email response from Nathan, at Supercar System. Here are the high points the status of their gearbox, February 2020:

- The website will soon be updated
- All tooling is completed for series production gearboxes. These are not one-offs.
- They have been testing these production gearboxes for the last 4 months, including max failure testing.
- Soon receiving more units for in-house in-car testing.
- No Ford bell housing is planned, as all of their projects are based on the GM LS series engines. However, a Ford bell housing or adapter plate can be developed if not found off the shelf.
- The input shaft is a 26-tooth spline designed for the LS-series engine. This input shaft can be replaced from the front of the gearbox without disassembly. So, you can either use a 26-tooth clutch that fits the Ford pressure plate, or fabricate a different input shaft.
- No ETA for release to public, but they are hoping this year.

The measurements of the SCS gearbox are similar to the RBT ZF, except is is shorter. The input to output shaft is only 10mm difference. The bellhousing/spacers can be made to line up the output shafts, as this dimension is nearly identical to the ZF. The one concern is ground clearance, as the body of the ZF steps up from the bell housing, while the SCS gearbox is nearly level, albeit shorter.
 

Bill Kearley

Supporter
Sounds like it may be a good fit, with one question, how long is the trans input shaft re a fit to the crank bearing, oil pump? Any more pictures and other info?
 
RBT 5spd ZF trans-axle:

RBT ZF Drawing.jpg


Supercar System (SCS) Gearbox:

SCS Gearbox dwg.jpg


I'm not savvy with trans-axle terminology, but I'll make the following observations. Assumptions: RBT does not show a bell housing and the SCS does. I'll assume the input shaft of the SCS is coincident with the face of the bell housing.

Dimensions
RBT SCS Difference
Input vs Output 79mm 79mm 0mm
Input end to Output 264.75 260 4.75
Length 692.75 567 125.75
Width 378 584 266
Output flange width 300 410 110

TheSCS challenges seem to be adapting the SCS gearbox to the SB Ford, and fitting into the GT40 rear frame. Drive axle geometry will have to be 55mm shorter than the RBT. I'll be anxious to see how it develops.

SCS Advantages: Sequential shift, quick change ratios, replaceable input shaft, 1000HP 900TQ, same price point as other options
SCS Disadvantages: New and unknown, long term viability, SB Ford fitting, fitting into GT40 frame, non-authentic

I'll be interested to read observations, as I have no experience with trans-axle installations on the GT40. I'd specifically like to hear from the RCR builders, as that is the kit I will be buying.

JImmy
 
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