Esk79 - I notice you are running with a Hilux diff.
What ratio centre do you have? LSD?
I have a 4.3 LSD Hilux diff in mine. I got the 4.3 because it was available at the right price, but unsure how it will go. I had a diff shop check it over and tighten up the LSD before going in the car.
The Nissan 200sx front cut I bought noted on the compliance plate it came with a 4.0 ratio diff from factory. So 4.3 shouldn't be too far off the mark for short circuit, hill climb fun?