My RPO codes must be wrong for the truck I have. I own a 2004 Silverado LT with the LQ9 6.0L MFI HO engine and 3.73 rear end. The RPO code shows a M32 transmission which is a 5 speed manual for an Isuzu. This of course doesn't make sense and it must be a typo from the folks in Canada? Is there a serial number that I should look for on the transmission? I am sure it is a 4L60E, 4L80E or 4L85E transmission. Can anyone help me out? Thanks in advance.

 

M32 is the RPO for a 4L65E.

 

Thanks. I think I read the codes wrong. I appreciate it. Mike