Originally Posted by ericlee9386
Is it possible for the dealer to just flash a 2500 program to the 1500 PCM's? That would eliminate MDS and give you the gear ratios of the 66 (68rfe) which should be plug and play but I cant ever find a straight answer.
The 66 still has the same ratios as the 45. The 68 sun and planetary gears are opposite to the 45. I have been trying for over a year to figure out a way to tune a 45 to handle 68 gears, but still no luck.