check my engine and trans mounts. it sounds like the torque when pulling against the tranny is moving the engine enough to touch two parts together that are not supposed to touch. a weak mount would allow more movement than is designed for.

tom w

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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.