Options for a small, light snailshell transaxle?

[Leanne]

I know you are all way beyond what I'm trying to do in my daily driver but I'd appreciate your advice.

So i have a front mid engine rwd 1973 opel gt. It doesn't have any room behind the solid rear because of the gas tank so putting a jag xj6 irs in the back and have been looking at a porsche g31 but the prices for a good one is very expensive.

The big issues if 1st and 2nd gear is broken there is no way to fix it. Does anyone know if I can bolt another trans up to the diff?

I thought of trying to use a t5 4x4 transmission mounted in the rear to a corvair diff but haven't had much to go on at this point.

I am putting a buick regal 2.0t that can be tuned to 350 hp and 370 ft lbs torque. In the 2000 lbs car, this might end up too much power, so I will start with the stock 270 hp and 300 ft lbs torque and only upgrade if the rear tires arent constanty breaking free everytime I touch the gas pedal.

Any suggestions on something light and small similar to a Volvo 360 m47r or a porsche 928 g31? Diff in back so no clearance issues with gas tank?

 

[JP Verweij]

Have you considered a Capri or Escort mk1 & mk2 rear axle. Stock diff can handle 500bhp easy. First you break are halfshafts but GP1 or GP4 upgrades are widely available.
I run a Supercharged V8 in a Capri with stock Atlas axle & Quaife ATB diff. Only broke a halfshaft once and replaced that with GP1 shafts with stock 16 spline, not even the GP1 18 spline as I didn't wanted to swap the diff carriers.

 

[Ole Nylende]

Converting it to independent rear suspension or a de dion setup will require alot of effort.
Not sure what bits are available in your region; the engine you want to use i believe is in the gm ecotec family, i think the r25/28 box will fit but not sure how available it is where you live. Should be alot of options for adapterplates to run various bmw boxes. Rear axle either something from a yank or a Volvo 240 axle. The Volvo axles are used quite a bit here but again, not sure on availability.

If you want a live transaxle maybe a Corvette unit could fit? The t56 transaxle

 

[Randy V]

Thoughts -
Porsche 924’s can still be had. Swap in the whole rear suspension along with coil-overs. Gas tanks are easy peasy…