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Discussion Starter #1
Hi I have a 99 cummins with an auto trans. Out of nowhere the truck began not wanting to shift out of first gear at the right time. Will shift if i let off a little bit or shift manually. What could be wrong. Mods done to truck are 5 inch mbrp exhaust s&b intake bd boost elbow and quadzilla boost fooler.
 

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how many miles are on your rig?
 

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Discussion Starter #3
i have 194,000, but have had tranny shifting problems before. i took it to a dealer and they said my harness going to the apps was apoxied together. wonder if this is why it wont shift right
 
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