thank you am thinking of building 540 for my s/w that may weigh 37-3800 lbs., w/3.54 gears at 65 mph and 33" tall tires rpm would be approx. 2400.trying to cut that down some w/out buying gear vendors or keisler od unit. bellhousing may be biggest concern due to bolt pattern. thanks again. very nice rampage. I had one black and silver 2.2 5spd 32 mpg. wish I still had it. yours is a lot neater though.