This page is for "heavy duty" GM C/K models:
-
1500 series w/ diesel (1991-1995 "non-turbo")
- 2500 series > 8500 GVWR or diesel
- all 3500 series
- + all 1988-1991 classic R/V series (Crewcab, Blazer / Jimmy, Suburban)
Manual transmission guide:
| # gears |
Year |
RPO |
Manual Trans |
Shifter notes |
| 4 speed |
1988-1991 |
M20 |
Muncie SM465 |
integral tower not serviceable |
| 5 speed |
1992-1994 |
MT8 |
NV4500 w/ "round top" |
integral tower; shifter cannot be changed w/o swapping to newer lid
|
| 1995-2000 |
MW3 |
NV4500 w/ "square top" - short lid |
1.75" stub protrusion below flange |
| 2001-2007 w/ 6.0L |
MW3 |
NV4500 w/ "square top" - tall lid |
2.0" stub protrusion below flange |
| 6 speed |
2001-2006 w/ 6.6 or 8.1L |
ML6 |
ZF S6-650 |
(all 2007 w/ 6.6 or 8.1L are automatic) |
2003-2014 C3500 HD - Mexico domestic market = TR-4050 (RPO M96 & MQ7) - similar to NV4500 but shifter is different (inquire)
- NV4500 warning: the shifter base for 1995-2000 is different from 2001-2007 because the lids are different (GM only)
- NOTE: any 1988-1995 light duty C/K could be optioned w/ HD trans - check your RPO label and/or see if case is cast iron
- HD trans was not offered for GVWR < 8500 lb after 1995
- For most 1500 series (1/2 ton) & rare 2500 series < 8500 GVWR (except diesel) - see the Silverado 1500 page
