Auto box clunking / jolting when our into drive

hello

I have a F2 and ever since I went to billing off road (didn’t go ‘off’ road) the whole car is giving a big shudder when I put it into drive. All other gears are fine.

I’ve tried being gentle/fierce and nothing helps. Billing world record attempt was really slow and really really dusty.... any thoughts??

How many miles is on the fluid?

It'll make no difference how you move the gear selector, as it simply signals the TCM (Transmission Control Module) using a switch.