I use in some of my 4*4 cars an EZ Run 60 with a 5,5t with a gearing of 9,0 and I have altered the timing to 18,75 instead of the standard 15.
I am using this with 3200 trackpower.
It is a cheap combo but you can compare the speed to Novak GTB with a 6,5 R and until now (touch wood) I did not have any problem yet (I have 3 of them).
Make sure that the speedo gets enough cooling.
Greetz
