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I would like to know that too dikwks. Are the engine crank connection and bell housing the same from early 250 through the later 8.3 turbo? One would think it is possible that all 250's and 8.3's have a consistent pattern over a lot of years. If they are the same between Spicer and Alison on...

Hi cumminsbandit, I can't tell if Brushmaster Builder has went to the 8.3 or 250 (putting auto into an 809 series). Maybe he will say. When I have a bit more time I will follow up. My 817 would be a good candidate for a swap with less than 17k and 1983. Also, does the transfer case have to...

Thanks BrushMasterBuilder and patracy. Do either of you know if the engine to transmission connections are the same in the M809 series (70's) with 250, through the 80's model 923's with 250, clear to the BMY 923 with the 8.3T? That is, aside from drive shaft modifications. Or asked another...

They are both Cummins 250 wheelspinner. And my truck has under 17K, so not worn out. Yours? Edit; They are 250 if yours is the older 939 as apposed to a BMY. Edit again; Is the tranny from an AM General 939 series also the same mount to the later 8.3T Cummins in the BMY? In other words...

Bump. Has anyone changed an 809 series to an Alison?

I thought so too, but kind of like the body style of the M817 and it has only 17k miles (very straight bed, not abused). Price was within budget and I can sell after doing my job if I don't like it.

Hi guys...just won an M817 on GL and have a question. Has anyone changed to an Alison auto? I really don't like shifting.