Quote Originally Posted by Vombil View Post
3.36 out of a WB would be choice. 3.08 might be a bit sluggish. my bro put a 2.78 with 253 4-speed and blew the gearbox immediately. He had to slip it and rev tits to get the slug to even move. gr8 if you live in the cuntry though
He used the wrong gearbox. To successfully run a 278 rear with an Aussie you need an M22, if your engine is a V8 then you swap the input shaft in the M22 for the input shaft from a V8 M15. This will give you a first gear ratio of 10.39:1 with the 2.78 diff. This combination will also give a 2100-2200 rpm cruise at 100km in 4th, comparing this with an M20 with a 3.55 diff giving a 10.83 overall ratio you can see that the M22 and 2.78 diff is a good choice as long as you don't want to be a boy racer. The beauty of this combination really comes into its own behind a 308 as the extra torque of the bigger engine masks the wide ratios and gives great take off and cruise. I am going to run a Falcon T5 with the 3.50 first gear behind my 253 with a 3.08 diff, this will give me a 10.78 first with an 1800-1900 rpm cruise at 100km with the standard 0.78 over drive.