92 Bluebird Skoolie with Allison 643 will not shift

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fishhuntguy

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Joined
Jun 21, 2011
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I have a 92 model bluebird school bus converted to a camper that has an allison 643 in it with 150k miles. It has never give us any problems until now. The last time we used it, we drove it 200 miles and the transmission performed as normal. We parked it for a month and now, it doesn't want to shift out of 1st gear. It goes into reverse fine. It doesn't slip or make any strange noises when in 1st or reverse. 1st gear runs strong. It stays in 1st when you try to select different gears on the shifter.

The only thing different about this trip is that we just had the radiator fixed. We had a rock hit it and puncture it so we removed it and had it patched. Maybe some trash got into the transmission part.. I'm not sure?

Any help will be greatly appreciated!
 

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