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Old 05-08-2013, 04:20 AM
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123hotdog 123hotdog is offline
LawnSite Senior Member
Join Date: Aug 2012
Location: Bristol TN
Posts: 481
1993 Isuzu NPR overdrive shifting problems

I have a 1993 Isuzu NPR. All of a sudden it quit shifting into overdrive. While in drive at 35mph or so, if you stomp it (not necessarily to the floor) it will shift into overdrive, however, if you lift off the accelerator or the truck levels out based on where you have the accelerator, it immediately drops back down into drive even if you are going 65mph. I am at a loss. The transmission shop (the best and most reputable in my area) said it is not internal. The truck service company that normally works on the truck says they don't do transmission work. I am so stuck and this is the backbone of my business and just spent $3000 in repairs at beginning of the season for new turbo exhaust ect. Forced me to park it and go back to a truck and a trailer.
Licensed and Insured
Operating since 2007
1993 Isuzu NPR dove tail open bed 4cyl diesel
1978 F-350 Dump Truck
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1989 Toyota One ton Flatbed
2015 61" Wright Z 850 Kawasaki
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2014 48" Wright Walk Behind
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