The 'vette answer is a simple 1. They are a Borg Warner/Tremec T56 based gearbox with a differential housing bolted on the back. Simple, big solid transmission design.GarthW wrote:I know everyone thinks that once a certain HP is reached, the rear transaxel will blow, well actually it will, but how has corvette managed to hold nearly 600hp with the gearbox in the back..? I know its had a hell of alot more engineering than our gtv6's, but i'd rather spend the cash modifying my transaxel than having a gearbox up the front..
That would come down to coin.GarthW wrote:Would love to know what can/could be done to hold more hp for the transaxel...maybe a borg warner could fit in the back...?
The Borge Warner 'box looks the easiest (compared to say a Toyota W58 or a Nissan 'box) to adopt a cable shift mechanism to. I figured that would be the easiest way to sort out shift issues.
The biggest problem that I see is the gearbox output is at the top where the Alfa gearbox output is at the bottom.
Chev got around this by having the pinion shaft go right across the top of the diff and actually engage the crown wheel at the rear of the diff housing. The only real problem I see is that of lubricating the bearings, so I'm guessing they used a pump of some kind.
As for building a diff housing, it could simply be fabricated out of either steel or aluminium and the machined as required for bearings. That's how most/all of the big industrial gearbox housings are made.
I'd base the diff on a common, strong well supported in the aftermarket IRS based diff like the Nissan R200. If they survive behind 1000hp drag cars, then they would be good enough for 99.999% of any Alfa's ever built.
I'd only ever make the housing like the Nissan design with 2 big main bearing caps that hold the diff in place and an end plate, deffinately nothing like the Alfa transaxle design.