My 87 MJ with 4.0 Renix shifts way too low for my liking, keeping it under 2,000 rpm. I don't care too much about mpg, as this isn't a daily driver. Is there anything that can be done to adjust the shift points?
I am still looking for a 89-90 428 ECU to swap in, which I hope helps the acceleration a bit (and perhaps fixes this issue). It just seems so slow after shifting out of first gear.