I have a 1970 2 ton GMC truck with 427 motor and an Allison 4 speed automatic transmission , It was rebuilt not to long ago but never driven, reveres works fine goes into low but won't shift into 2,3...

Allison Transmission

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copper1

I have a 1970 2 ton GMC truck with 427 motor and an Allison 4 speed automatic transmission , It was rebuilt not to long ago but never driven, reveres works fine goes into low but won't shift into 2,3 or drive any idea whats wrong ?

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