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interesting 91 model year should be 4l80e not 400 op claims to have a 3 speed manual unless that got swaped in at some I think the op has a sm465 and the shift pattern is confusing him
An overwhelming majority of GM HD trucks, SUVs and Vans, including commercial vehicles, received the 4L80E beginninng in 1991. There may have been a few sub-models/variants that received TH400s into 1992 but I'm not aware of any TH400s persisting beyond that year.
I hear ya, but despite what “should”be GM likely used up the last Turbo 400s in 90 and 91 to use up the last of them.
not in 89 nv4500 came out some time in 91 he has a sm465 there is a chance that it could be a hm290/5lm60 but I do not think any would confuse that with a 3 speed gm did not start nv3500 till 93 and I am seeing mixed year for nv4500 stat some say 91 some say 92 I would say mid or late 91 is most likely the right answer
