J-code trans

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02-09-2010, 08:21 PM

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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02-14-2010, 07:20 PM

truknut1972

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It should be a place in your owners manual. That gives you the codes..

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02-15-2010, 12:15 AM

S.A.L.

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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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