[coolhandcountry]

I have ran the 9xl with a 20 51 mod 1 on 18 cells. It did run warm. I have ran a 7xl on 22 66 gearing on 18 cells to. It also ran warm. I have not problems with running a 9xl on 16 51 gearing 1/8 diffs and 16 cells or 18. I can run the gearing with a 9xl on 12 to 18cells with no heat problems in 90 f temps. no fan.