1997 6.5 2500 have an allison transmission?

[Ms54Coupe]

forgive me, I am new to the game and am not sure who made the transmissions for the 97 k2500 6.5 turbo diesel. I hear a lot of talk about allison transmissions on the newer dura max but did not know if allison mad the transmissions on the older turbo diesels too?

Thanks,

Nate

[DmaxMaverick]

Nope. The Allison tranny is/was only available on the 2001+ Duramax Diesel and 8.1L gasser trucks. If you have a 1997 Diesel with an auto, it came with a GM 4L80E tranny. The gasser 1500's came with a 4L60E, but all Diesels of that year got the 4L80E.

[Ms54Coupe]

Thanks buddy! Whats the rep on the 4L80E...pretty good ?

[DmaxMaverick]

Just about as good as autos get.

[6.5 Detroit Diesel]

IMO, the 4L80 is about as stout as you can get with an older electronic automatic. know of guys who have regularly towed 5 ton loads with their 4L80 equipped trucks and haven't had problems.

of course, the NV4500 is something else, if you can get it.