The Fugitive

iTrader: (6)

I was just wondering how can you tell the different years and or what kind of vehicle a 4L80 came out of?

forcd ind

iTrader: (7)

there is a tag on the pass side, tells what year it is-i would avoid 91-93, they had an older arrangment of the force motor
97 up moved the cooler return line to the back into the center support
i forget what year they started using a bellhousing bolt in the 12 o clock postion
if you can, pick a 99 or newer, the more fact. upgrades the better, but all will work

The Fugitive

iTrader: (6)

Great I can't even tell what that thing says but are the trans cooler lines a for sure way to tell. I was told that the pictured came out of a 02 HD is this true?

forcd ind

iTrader: (7)

looks like a 96-back trans, def not an 02-may have come out of an 02, but not orig-if you pull the pan and look at the force motor you can tell if its 91-93-if it was used in an 02, it might be a 94-96-the 94 up sup used a diff force motor voltage or whatever and and was not compatible with the older pcm

The Fugitive

iTrader: (6)

I don't think a person would get a old style transmission to put in a new truck plus the fittings are in different places also the missing 12 o'clock bolt it just wouldn't make any sense to. so I just have to work the channels now to get my money back for it.

The Fugitive

iTrader: (6)

okay so how would I be able to tell on the pressure control (force motor) that it is a pre 94?

forcd ind

iTrader: (7)

it has a diff plug and is a little larger-i think the plug comes off the back and is wider-i could prob snap a pic of a 94-up
is there know way to read the tag

FLT

iTrader: (1)

This is the case connector on the 60/65/70 with an ISS and the one on the 80 with the later harness should have one that looks very close. The only difference is a couple of pins are moved around. The early harness looks totally different and should have a threaded hole in the middle of it for a bolt. The unit you have is definitely a 91-96 and could be earlier unit with an updated harness. Here is a picture of the case connector. Vince

forcd ind

iTrader: (7)

i thought about suggesting looking at the case plug, but if it was upgraded still wouldnt tell a lot-i have a 91-93 unit that was GM remanf., bought it on the chance it was 94-96 (they replace the side id plate with a diff one)
based on the case plug, but ended up being older w/upgraded harness
it was only $75, lol-it was a 4WD unit, but had the speed sen ring, i was gonna convert it to 2WD for a spare

forcd ind

iTrader: (7)

on the force motors, the old one 91-93 will have a plug on the back of it, and the later will have the plug on the side-like Vince said, if the case plug has the diff pins and screw(diff than his pic) you will know its old right away

The Fugitive

iTrader: (6)

thanks for the help guys this is really helpful, just for knowledge on here ( talked to GM yesterday but they weren't supposed to answer conversion questions) is there any problem or foreseen issues I would have with doing a LS1 conversion with the older model?