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Showing results for tags '2nd gen cummins overdrive'.
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Hi all, Started noticing a problem with my truck when it shifts into overdrive. Driving down the road, truck shifts through the gears normal kicks into overdrive and then starts acting differently. It will cruise fine under light throttle... as soon as I give it throttle, it responds very sluggishly, starts throwing consistent black smoke, the EGT's will jump up, and the truck is vibrating. It will continue to do this until it really gets up and going, or if I let off the throttle. It really is a pain because the truck drives in overdrive a lot on the 35-50mph roads around here. This has just started happening and seems to be getting slightly worse. Any ideas/help as to a diagnosis or where to start looking? As always thank you in advance for any help. - FYI...recently put a new turbo in the truck which is considered a slight upgrade I believe with the 59mm inducer. - Edge Juice with attitude, fass150, 4'' turbo back exhaust, BHAF