My current research indicates the Allison 2500,2550 has the 3.51:1 ratio,
the 2100,2200 series has the 3.10:1 ratio. Would anyone know what production
vehicle uses the Allison 2500,2550 trans ?

Thanks, Steve Carlisle

I would guess just about all American made Tractor Trailers .
It is very common. Is there an automatic transmission repair shop
in your town? They would know.

Paul Lamar

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