TR6 engine swap

[300bhp/ton]

DonkeyApple said:

The updated HP wouldn’t handle an LS for long nor would the BW transfer case and the later axles would have been needed. Switching to the 4L box would have been a chore as well as the sump is offset the other way so you’d need to move it further back to get the forward drive shaft to clear. Plenty of people have bodged SBCs in but I’d want a properly engineered solution that kept the car compliant.

Same issues using the Mercedes engine and the Jeep drivetrain elements.

The Rotrex charger solution achieves exactly what is needed which is the power upgrade without replacing the drivetrain, just uprating.

Axles are quite ok for road use, as long you weren't full bore form a standstill I suspect stock internal axles would hold up fine for quite some time.

HD shafts, crownwheel & pinion are all available, as are 4 pin diffs or ATB centres. All would allow the keeping of the original axles, just with improved internals.

Gearboxes, as said. Depends on the engine in question, the HP24 ZF box would likely be fine with moderate power. Not sure about the Borgwarner transfer box, but the LT230 was also standard fitment and will easily handle 450hp. You can also get a 4L80e adapter to the LT230.

Not disputing your chosen path though

[DonkeyApple]

I’ve owned the last 5.7 Overfinch conversion with all the updates Ashcroft drivetrain parts. It’s not enough and an LS will chew them all up. And that’s before this issue of retaining the early axle casings and then trying to fit a metric braking system.

The 4L does have adapters, I’ve used them in another RR conversion but the sump is offset to the other side so you need bespoke shafts. You have the same issue with a 6L plus the hurdle of the TCU etc.

Boosting a late cross bolted RV8 and staying within the right torque range is mechanically a superior set up.