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No reverse range shift inhibited

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2005silverado 8.1l  2500hd. Allison Tran  won’t go into reverse   Fluid clean no metal chunks  clean plug  new filters new n s b u switch on outside of Tran on drive side  clean plug. New ignition switch.  New fluids  but no reverse range shift still on dash.  Goes into drive   Motor has a p t o unit on it city own truck before I did if it means anything. 

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