Common Abbreviations Found on the Forum

[Aloicious]

Agreed. Always wondered why they went from 400 to 800 though.

GMT codes are used for EVERYTHING that GM considers a truck or truck-like...SUV's, s10's, minivans, crossovers, vans, etc...and there are many different segments of the GMT platforms...the full size trucks just happen to be 400, 800, 900 (ish)....for example an express van is a GMT600...there's even segments within the GMT platforms...like a 99-06 Suburban is a GMT830, where a tahoe is a GMT820...newer ones are even more segmented, a current silverado (crew/extended/regular cab) is a GMT901, where a silverado HD is a GMT911, and a Sierra is a GMT902...

getting super specific like that isn't really needed, but using the main 400-800-900 terms is very helpful vs the OBS/NBS stuff...

here's a link with some of the GMT platform designations if you want to read up on it:
http://en.wikipedia.org/wiki/GM_GMT_platform

 

[Aloicious]

TBI - Throttle body injection (already said, I know)
CSFI - Central Sequential Fuel Injection
MPFI - Multi Point Fuel Injection
TPI - Tuned Port Injection
TB - Throttle body
L31 - Vortec 5700 5.7L Engine Code
L30 - Vortec 5000 5.0L Engine Code
G80 - Factory Positraction carrier code
PCM - Powertrain control module
ECM - Engine control module
TCM - Transmission control module
TTABA - Twin Turbos are Bad Ass
GM - General Motors
M22 - Muncie 'rock crusher' 4 speed manual transmission code
T56 - Borg warner/tremec 6 speed manual transmission code
M30 - 4L60e transmission code
POS - 4L60e nickname

okay so maybe you won't see m22's and a few others of those mentioned here too much but some of those might be helpful

 

[dkennedy]

I'm glad this thread came about. The other day I had to PM another member to sort out the 400, 800, 900 thing... I hadn't had time to attempt to decipher the alphabet soup of abbreviations for the body styles and such.

 

[88GMCtruck]

Few I've seen show up that might help out as well.

L03 - TBI 305 5.0L
LO5 - TBI 350 5.7L
L19 - TBI 454 7.4L
L29 - Vortec 454 / 7.4 / 7400
MT8 - NV4500 6.34:1 first gear
MW3 - NV4500 5.61:1 first gear
T84 - RH rule of road
T85 - LH rule of road
Z71 - Offroad Package
Z85 - Handling / Trailering Suspension

RPOs dictating vehicle brand:
X88 - Chevrolet
Z88 - GMC
Z75 - Cadillac

One that I bet few people know exists...

HOT

My 02 has this RPO. Appearance package GMC “Hot Truck”