Bit of a head scratcher, for me at least, I've come to conclusion of cuntsf*cked. BA BTR 4spd, recently installed into BF. Running air trans cooler. 1-2-3-4 = work fine in tiptronic and D mode. 4th works, 4th gear kickdown works, 1st gear engine braking works Reverse = works fine when COLD When WARM, it needs about 2,000rpm over 3 seconds, back off throttle slightly, and then reverse engages with a big thud. When HOT, it needs about 4,000rpm over 3 seconds, back off throttle slightly, and then reverse engages with a big thud. Trying to work out if it is a: Line pressure issue Low fluid in transmission Reverse input clutch Anybody have an idea ?