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J-code trans

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Old Feb 9, 2010 | 08:21 PM
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laka
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J-code trans

How can I ID a J-code trans in a lightning? Truck was built in March 2001.

If the truck has a J-code, how concerned should I be? Truck already has 47,000 miles on it.
 
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Old Feb 14, 2010 | 07:20 PM
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It should be a place in your owners manual. That gives you the codes..
 
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Old Feb 15, 2010 | 12:15 AM
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The ID tag on the side of the tranny will have a J1 in it.
It's the mechanical diode that fails and you lose second gear.
Not all of the J1s break so just drive it as usual.
Mine broke twice while under warranty.
 
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