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  1. 98.5-02 Powertrain
    99 Cummins 24v. Automatic. 30k miles on Jasper transmission. (Out of warranty since it was replaced 4 years ago) The issue I'm having is.. it will not shift into 3rd gear with overdrive on but, with overdrive off it will shift into 3rd gear. What would cause this issue? Thank you!
  2. 3rd Gen. Powertrain
    I’m sure all of us that own an early model G56 know the woes of driving it on the interstate. Crappy fuel mileage, engine revving high, loud droning if you have a straight pipe, and just a much lower top end speed… I hate it, and I am not putting up with it anymore. It’s a great transmission...
  3. 98.5-02 Powertrain
    Hello, I recently traded a 2500 Cummins for a duelly 3500 that had a bad TPS. The owner told me it didn't have overdrive because the TPS was bad. Check engine light was on, so I believed him. Anyway, I installed the new TPS and the throttle works great, check engine light turned off - but...
  4. 3rd Gen. Powertrain
    Past Truck 2003 5.9 Cummins Extra cab 2500 was a 2W drive weight about 6200 pounds was perfect from 33K to 150K miles which is why I feel my 2007 has a tranny issue see below. Smarty added yes: Current Truck - 2007 high output 5.9 Mega Cab 4 wheel drive 160K miles weight about 8600 pounds...
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