Merchandised transmission, automatic provisions, overdrive

Years 1984–88, 1990–91, 1993–96, 1998–09 Models 14 Factory citations 50

Also described as Merchandised transmission, automatic, provisions, overdriveTransmission, 4 speed automatic, overdriveMerchandised transaxle, automatic provisions, overdrive

Also documented for Cadillac Chevrolet GMC Oldsmobile Pontiac Saturn

Documented applications

Century — W-body (1997–2005)

1998–2005 Factory-verified

every Century list prints MXO (letter O); GM's other lists print MX0 with the same wording

GM factory document — 1998 buick century rpo code list, p.1.
GM factory document — 1999 buick century rpo code list, p.1.
GM factory document — 2000 buick century rpo code list, p.1.
GM factory document — 2001 buick century rpo code list, p.1.
GM factory document — 2002 buick century rpo code list, p.1.
GM factory document — 2003 buick century rpo code list, p.1.
GM factory document — 2004 buick century rpo code list, p.1.
GM factory document — 2005 buick century rpo code list, p.1.

Estate Wagon — B-body (1983–1990)

1984–1988, 1990 Single-source

matched to the unit by meaning: Wikipedia's Buick Estate article names a 4 speed automatic among the generation's transmissions but prints no code; the kit pages print MXO (1985 MX0); the 1984 and 1986 weight pages list it for the Caprice wagon among other models, the 1987 page as standard on the Caprice wagon, the 1988 guide's wagon page as a no-charge item, and the 1990 guide's axle-ratio chart pairs it with LV2; 1983 is left out because the 1983 Caprice kit shows the overdrive automatic without a code, and 1989 because the 1989 kit's listed pages do not print it; shared B-body code; cited from the Chevrolet Caprice kit

GM Heritage factory kit — 1984 Chevrolet Caprice, p.39.
GM Heritage factory kit — 1985 Chevrolet Caprice, p.41.
GM Heritage factory kit — 1986 Chevrolet Caprice, p.41.
GM Heritage factory kit — 1987 Chevrolet Caprice, p.44.
GM Heritage factory kit — 1988 Chevrolet Caprice, p.14.
GM Heritage factory kit — 1990 Chevrolet Caprice, p.14.

LaCrosse — W-body / GMX365 (2005–2009)

2006–2009 Factory-verified

The 2006 list prints MXO (letter O) as "Merchandised Trans-Auto Provisions,O/D"; the 2007 to 2009 lists print MX0 (zero), which is the code. TriShield agrees on the meaning.

GM factory document — 2006 buick lacrosse rpo code list, p.1.
GM factory document — 2007 buick lacrosse rpo code list, p.1.
GM factory document — 2009 buick lacrosse rpo code list, p.1.

LeSabre — B-body (1983–1985)

1984–1985 Single-source

matched to the unit by meaning: Wikipedia's LeSabre infobox names the THM200-4R four-speed automatic for the generation but prints no code and no year; the 1984 page prints MXO; each page prints its own model year; 1983 is left out because the 1983 Caprice kit shows an overdrive automatic with no code; shared B-body code; cited from the Chevrolet Caprice kit

GM Heritage factory kit — 1984 Chevrolet Caprice, p.39.
GM Heritage factory kit — 1985 Chevrolet Caprice, p.41.

LeSabre — H-body (1992–1999)

1998–1999 Factory-verified

GM factory document — 1998 buick lesabre rpo code list, p.1.
GM factory document — 1999 buick lesabre rpo code list, p.1.

LeSabre — H-body (2000–2005)

2003–2005 Factory-verified

The lists print MXO (letter O); the code is MX0 (zero).

GM factory document — 2003 buick lesabre rpo code list, p.1.
GM factory document — 2005 buick lesabre rpo code list, p.1.

Lucerne — G-body (2006–2011)

2006–2009 Factory-verified

The lists print MXO (letter O); the code is MX0 (zero). TriShield agrees on the meaning.

GM factory document — 2006 buick lucerne rpo code list, p.1.
GM factory document — 2009 buick lucerne rpo code list, p.1.

Park Avenue — G-body (1997–2005)

2003–2005 Factory-verified

TriShield prints MXO (letter O); the code is MX0 (zero), as GM's lists print it.

GM factory document — 2003 buick park avenue rpo code list, p.1.
GM factory document — 2005 buick park avenue rpo code list, p.1.

Regal — G-body (1983–1987)

1987 Factory-verified

not with LD5; included with WE2, whose lists call it the 200-4R; gnttype.org's 1987 option sheet; 1986 is left out because gnttype.org prints it that year only inside the WE2 package; the kit's 1987 price page prints MXO; shared G-body code, cited from the Monte Carlo kit

GM Heritage factory kit — 1987 Chevrolet Monte Carlo, p.47.

Regal — W-body (1988–1996)

1991, 1993, 1995–1996 Single-source

matched to the unit by meaning: Wikipedia gives every Regal of this generation a 4 speed automatic but prints no code; the order guides print MXO (letter O) and word it a 4 speed automatic (electronic in 1995–1996); 1990, 1992 and 1994 are left out because no listed kit page of those years prints the code; the description follows the merged regal-w-body-1997, century-w-body and lumina-gen2 docs, while the merged lumina-gen1 doc reads MX0 as Transmission, 4 speed automatic, electronic; shared W-body code; cited from the Chevrolet Lumina kit

GM Heritage factory kit — 1991 Chevrolet Lumina, p.18.
GM Heritage factory kit — 1993 Chevrolet Lumina, p.18.
GM Heritage factory kit — 1995 Chevrolet Lumina, p.10.
GM Heritage factory kit — 1996 Chevrolet Lumina, p.18.

Regal — W-body (1997–2004)

1998–2004 Factory-verified

every Regal list prints MXO (letter O); GM's other lists print MX0 with the same wording

GM factory document — 1998 buick regal rpo code list, p.1.
GM factory document — 1999 buick regal rpo code list, p.1.
GM factory document — 2000 buick regal rpo code list, p.1.
GM factory document — 2001 buick regal rpo code list, p.1.
GM factory document — 2002 buick regal rpo code list, p.1.
GM factory document — 2003 buick regal rpo code list, p.1.
GM factory document — 2004 buick regal rpo code list, p.1.

Rendezvous — U-body / GMT257 (2002–2007)

2002–2007 Factory-verified

The 2002 to 2005 lists print MXO (letter O), the 2006 and 2007 lists MX0 (zero), which is the code; the 2002 list reads "Merchandised Automatic Transmission".

GM factory document — 2002 buick rendezvous awd rpo code list, p.1.
GM factory document — 2003 buick rendezvous awd rpo code list, p.1.
GM factory document — 2006 buick rendezvous awd rpo code list, p.1.
GM factory document — 2007 buick rendezvous fwd rpo code list, p.1.

Roadmaster — B-body (1991–1996)

1993–1996 Single-source

the order code the Caprice order guides print for the four-speed automatic, matched to the Roadmaster's unit by meaning: no Roadmaster source prints MX0; the pages print MXO; the 1993 order guide prints MXO for the power teams the 1993 specification page codes MD8, and the 1994–1996 guides for those the specification pages code M30, the pages not saying whether the codes are one unit; 1991–1992 are left out because no kit page with a printed model year prints it (the 1991 specification page prints MXO and no model year); shared B-body code; cited from the Chevrolet Caprice kit

GM Heritage factory kit — 1993 Chevrolet Caprice, p.10.
GM Heritage factory kit — 1994 Chevrolet Caprice, p.12.
GM Heritage factory kit — 1995 Chevrolet Caprice, p.8.
GM Heritage factory kit — 1996 Chevrolet Caprice, p.12.

Terraza — U-body / GMT201 (2005–2007)

2005–2007 Factory-verified

GM factory document — 2005 buick terraza rpo code list, p.1.
GM factory document — 2006 buick terraza rpo code list, p.1.
GM factory document — 2007 buick terraza rpo code list, p.1.

This page aggregates every documented appearance of MX0 in the Buick reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.