Equipment group 1LZ, LTZ

model 1LN26 (FWD LTZ); NICB series Captiva Sport LTZ

2006 comes from the 2006 kit order guide, whose column headings show it; the 2006 factory list has no entry.

The 2006 order guide lists 1LZ and 2LZ columns for the Z06 (HK p.107); the NICB 2012 manual prints "Z06 Standard 1LZ" in its 2011 column; 2011 is not claimed because no 2011 factory list exists.

only in: Z06; 2017 from the NICB VIN manual; 2016, 2019: from GM order-guide copies (Corvette Action Center; 2019 also GM Authority)

only in: Z06, E-Ray, ZR1, ZR1X; Z06 coupe 1YH07 and convertible 1YH67; E-Ray coupe 1YG07 and convertible 1YG67 (2024 guide)

models 1LJ26 (FWD) and 1LM26 (AWD)

models 1LJ26 (FWD) and 1LM26 (AWD); the 2017 official changes rename LTZ to Premier

NICB series Premier (1LZ); NICB 2018 p.168, NICB 2020 p.164, NICB 2021 p.169, NICB 2022 p.160, NICB 2023 p.154, NICB 2024 p.161

FWD and AWD, LYX engine; the 2018 guide prints 1LZ only with footnote digits

model 1GZ69; 2.5L engine; NICB series LTZ (2014), LTZ (1LZ) (2015)

printed only by the NICB VIN manuals (2016 p.49, 2017 p.50, 2018 p.49) as LTZ (1LZ); the 2016 guide has no 1LZ column

LTZ (model 1WU19); the order guides print it as a column heading only, with no description.

model 1GD69

rests only on the NICB VIN manuals (2016 p.49: series LTZ (1LZ); 2017 p.50: Premier (1LZ)); the 2016 guide has no 1LZ column

the 2016 guides print it only with a footnote digit (1LZ2), so 2016 is not claimed; 2017: GM's 2017 Silverado 2500HD order guide; 2018: GM's 2018 Silverado 2500HD order guide; 2019: GM's 2019 Silverado 2500HD order guide

only in: 2500 HD, 3500 HD; LTZ: 2025 Crew Cab C*20*43 (2500 HD) or C*30*43 (3500 HD), 2WD not available to order; 2026 and 2027 4WD Crew Cab CK20*43 (2500 HD) or CK30*43 (3500 HD); 2023 Upfitter list prints "Package" with the option number

trim group printed under the LTZ heading of the guides;

relabeled 1SE for 2013 (GM Authority 2013 changes article (not a GM document))

the 2015 and 2016 guides head the LTZ column with it and the 2018 and 2019 guides the Premier column; NICB lists the Premier series from 2017; 2018–2019 from GM's 2018 and 2019 Suburban order guides (GM Authority copies)

the body-builder lists name it LZ option 1

Named as an equipment group in the 2007 kit's order-guide pages, where p.143 pairs LS (1LS), LT (1LT), LT (2LT), LT (3LT) and LTZ (1LZ); no GM list prints it.

the 2015 and 2016 guides head the LTZ column with it and the 2018 and 2019 guides the Premier column; NICB lists the Premier series from 2017; 2018–2019 from GM's 2018 and 2019 Tahoe order guides (GM Authority copies)

the body-builder lists name it LZ option 1

the guide lists 1LZ under the LTZ column, for FWD and AWD models.

Premier: S; FWD and AWD; the 2018 and 2019 guides print 1LZ only as the Premier column heading with footnote 7 (equipment groups on 1NE56 and 1NX56), and the 2018 guide names it bare only inside other codes' distribution-update lines (p.85–86), so the row carries no factory citation, and 2018 is left out because a footnoted column heading does not support a year; 2019 is from GM's 2019 change list (GM Authority's 2019 changes page), its VQP and PCX lines (VQP and PCX's VQP content on 1LZ); 2020: GM Authority's 2020 changes page, its BGP line that adds KI3 on 1LZ

High Country front-wheel drive: S; GM fleet model 1LD56; shown in the trim headings of the guides

column heading of the guide's equipment pages; a separate row because GM renamed the trim between 2016 and 2018 and the group code is the same

the same group code as the 2016 LTZ, under the Premier name; column heading of the guides’ equipment pages; a separate row because GM renamed the trim between 2016 and 2018 and the group code is the same