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Yes, Rolls Royce used the TH400 from about 1977 to 92. Jaguar also used the A6 until about then.

Yes, the only version of the 4.2 that did. Uses the V12 version of the 400 with an adapter plate. It had a very restrictive governor too, shifted at 2800 rpm, just as the engine was starting to make power. I changed it from one from a Cadillac and the shifting improved greatly.

I'm taking out the 4.2 XK engine/TH400 combo and putting in the XJR 4L80, so I fortunately don't need to rebuild the TH400.

I had it in my mind that the Jaguar version of the TH400 used a 34 element sprag and the standard GM was 16, or something like that? While it was all GM parts, didn't Jaguar specify different components from the parts bin than you'd see in a GM passenger car application? Or have I got that all...

Thanks, that makes it easier to get parts. I had understood that Jaguar upgraded various components within the TH400 to make it heavier duty than the GM version, I didn't know if they did that again with the 4L80e.

The mods were the "Andy bracket" which advances the timing about 5 degrees, plus a Powerhouse pully that drives that supercharger 10% faster. I lose top end RPM with that, but gain low end torque. I know I can max out the MAF now between 4000-4500 RPM at full throttle now with the supercharger...

I have a 1995 Jaguar XJR engine (supercharged 6 cylinder) and transmission that I am in the process of transplanting to another vehicle. When I bought the car, the PO had broken the boots to the traction control cable so the throttle cable was binding randomly, causing idle speeds in park...