Top Loader gearbox
11-20-2010, 01:23 PM
#17
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Looks like a mockup for checking length. No ring and pinion installed so far from a usable part.....The trick is attaching the shafts. Drilling a few holes in some flat alloy plate is far from having a WORKING transaxle. And as mentioned the shift linkage would to be a big challenge as well.
I wonder what are the plans for the clutch ?? it will not fit onto an auto torque tube.
11-20-2010, 02:41 PM
#20
Nordschleife Master
I think his plan is AT type connection to the motor, and clutch back in front of the tranny. I'd rather see the clutch stock up front, but this is serious McGuyver territory.
11-21-2010, 02:25 AM
#22
The gearbox I would like to see is the 6 speed auto in the GM cars like my Caprice, it has the auto blip down and could be used with paddles and I would imagine have plenty of torque capacity. It is a very smooth gearbox.
Greg
Greg
11-21-2010, 05:49 PM
#23
Race Director
This is in the works as we speak....BUT its actually a TCI 4L60E with the 6 speed kit...since they are stronger than the factory 6L80E.... My friend is building his Bonneville racer with one!
11-21-2010, 06:14 PM
#24
Nordschleife Master
i am glad to see someone mounting a transmission to the auto rear diff though, hope it works, hopefully it gets someone else to do the same with a more modern gearbox
11-21-2010, 07:17 PM
#25
Race Director
Rockland Standard who make the T56 "tranzilla" thats rated for over 1000ftlbs told me they could make a modified Vette transaxle that could hold 850ftlbs for around $4k.....basically a modified C5 transaxle they call "son of tranzilla"...
11-21-2010, 07:24 PM
#26
Three Wheelin'
Didn't they use a Top Loader transmission in the original Cobras? The transmissions were mounted further back in the chassis and they had to turn the shifters around so they would be further forward. Do the same thing in the 928 except extend it another 4 feet.
11-21-2010, 07:38 PM
#27
Nordschleife Master
pretty reasonable price too if you ask me for a NEW transmission
This is doable if you created a custom main shaft to couple to the Porsche Torque tube and an end that would mount to the pinion.
I dont know the specifics of the inside of the T56 but you could also just have a new coupler that mated the factory driveshaft spline count on one end to the T-56 on the other, but again you would need to adjust the length and spline count to fit into the pinion gear.
Someone do this already! And sell it to Roger who wont try and rape people when reselling it.
This idea is perfect for the auto to 5 speed trans conversions out there who would otherwise have no use for the differential portion of the transaxle, easy way to justify the cost of conversion when you dont need to buy a diff for the thing. The Corvette diff would necessitate too many changes without much gain. Although a 2.2 rear end wouldnt be great for the stock T-56 gear ratios with something like a .60 6th gear, so maybe you just adjust the length of the T-56 output but have a new ring and pinion made to whatever ration you want and make it mate to the T-56, i suppose thats what i would do, changing the rear end would be cheaper than messing with all the internal ratios, and you would need a work around to mate the T-56 to the diff anyway so in this case, just find a ring and pinion to fit the 928 case and your set
One of the most positively reviewed aspects of the T-56 is the positive shifter feel, the Corvette version makes the shifter install quite simple too.
11-21-2010, 08:27 PM
#28
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I don't know why they did that but I'm 100% envious of their machining abilities... if I had the ability to machine bellhousing adapters and trans shafts like they do I'd probably have BMW v12 in my project car... impressive.
11-21-2010, 09:31 PM
#29
Race Director
yup
pretty reasonable price too if you ask me for a NEW transmission
This is doable if you created a custom main shaft to couple to the Porsche Torque tube and an end that would mount to the pinion.
I dont know the specifics of the inside of the T56 but you could also just have a new coupler that mated the factory driveshaft spline count on one end to the T-56 on the other, but again you would need to adjust the length and spline count to fit into the pinion gear.
Someone do this already! And sell it to Roger who wont try and rape people when reselling it.
This idea is perfect for the auto to 5 speed trans conversions out there who would otherwise have no use for the differential portion of the transaxle, easy way to justify the cost of conversion when you dont need to buy a diff for the thing. The Corvette diff would necessitate too many changes without much gain. Although a 2.2 rear end wouldnt be great for the stock T-56 gear ratios with something like a .60 6th gear, so maybe you just adjust the length of the T-56 output but have a new ring and pinion made to whatever ration you want and make it mate to the T-56, i suppose thats what i would do, changing the rear end would be cheaper than messing with all the internal ratios, and you would need a work around to mate the T-56 to the diff anyway so in this case, just find a ring and pinion to fit the 928 case and your set
One of the most positively reviewed aspects of the T-56 is the positive shifter feel, the Corvette version makes the shifter install quite simple too.
pretty reasonable price too if you ask me for a NEW transmission
This is doable if you created a custom main shaft to couple to the Porsche Torque tube and an end that would mount to the pinion.
I dont know the specifics of the inside of the T56 but you could also just have a new coupler that mated the factory driveshaft spline count on one end to the T-56 on the other, but again you would need to adjust the length and spline count to fit into the pinion gear.
Someone do this already! And sell it to Roger who wont try and rape people when reselling it.
This idea is perfect for the auto to 5 speed trans conversions out there who would otherwise have no use for the differential portion of the transaxle, easy way to justify the cost of conversion when you dont need to buy a diff for the thing. The Corvette diff would necessitate too many changes without much gain. Although a 2.2 rear end wouldnt be great for the stock T-56 gear ratios with something like a .60 6th gear, so maybe you just adjust the length of the T-56 output but have a new ring and pinion made to whatever ration you want and make it mate to the T-56, i suppose thats what i would do, changing the rear end would be cheaper than messing with all the internal ratios, and you would need a work around to mate the T-56 to the diff anyway so in this case, just find a ring and pinion to fit the 928 case and your set
One of the most positively reviewed aspects of the T-56 is the positive shifter feel, the Corvette version makes the shifter install quite simple too.
11-21-2010, 10:00 PM
#30
Captain Obvious
Super User
Super User
I'm glad someone is finally making one of these and posting all the details.