BigToe wrote:
The 3/4 ton Suburban with the 8.1 liter engine was never fitted with the Allison, ever. Only the trucks received the Allison. The transmission fitted in the Suburban/YukonXL with the 8.1 was the 4L85e, which was an updated variant of the 4L80e that the 3/4 ton Suburbans with the 6.0L engine were equipped with.
This is correct...
I just recently sold my 3/4 ton 8.1L Suburban - was a great truck!
I don't know why, but many people (and even some bad salesmen) assumed the 8.1L Suburban had the same Allison trans as the pickups. I even met a guy with one that argued that he had the Allison, until we climbed underneath and I showed him his 4L85e...