What tranny is in my 91?

[themudking]

I have a 1991 k1500 4x4 rcsb with a 4.3l and the 5 speed (4 with overdrive) and my question is what transmission is it. I've asked this question many other places and i've gotten many different answers. I realize i can find some numbers on the side but i really just don't feel like crawling under there in the snow here. So it's probably too early to be nv3500 right? What number am i looking for on the transmission to find what it is if that's what i have to do?

 

[SCOTTYINWV]

Unless it's been swapped, it's a 5LM60.

 

[19trax95]

If it's the original then it's a 99% chance it's a nv3500.

Sent from my SCH-I605 using Tapatalk 4

 

[themudking]

This is what i mean when i say i keep getting different answers, one guy says 5LM60 another says nv3500, does anyone have any pics of what to look for on the tranny to ID it or is there an obvious number stamped in the side??

 

[SCOTTYINWV]

If it's the original then it's a 99% chance it's a nv3500.

Sent from my SCH-I605 using Tapatalk 4

The nv3500 was not released until 93.

The nv3500 shifter is also labeled 1-2-3-4-5-R

5lm60 and earlier is 1-2-3-4-OD-R

The shifter will not interchange because when the nv3500 was released had it had a single shift rail and the 5lm60 and earlier had 4 shift rails.

He has a 5LM60

 

[themudking]

thank you scotty

 

[someotherguy]

Great info Scotty - though I wouldn't go strictly on year model, since these are known for blowing up easily, may have been replaced with a different year unit out of the boneyard.

Richard

 

[great white]

Pictures of the casing and any identifying marks would help "put the nail in the lid"....