Originally Posted by
mjk1210
I used 528 mod with 7.5 in 2wd and 4wd for the past few months with most of the settings near the max without any problems. Its the last sc setting you want to tame down to -3 or so to keep motor temps in check. Especially in warmer weather. I used 23/78 geared in a b4 and 22/78 in a b44
Okay, so that puts you at 8.81 FDR. Thinking about trying an 8.5 D3 in my B4 this weekend with the 205Mod software. I assume somewhere 8.6 to 8.8 FDR is a good starting place? JP's setup sheets shows 78/26 with a 9.5, but I have no idea what the tranny ratio is in a XXXCR.