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Transmission identification in 01 Silverado

What transmission do i have?

Transmission identification in 01 Silverado

Postby starterz [OP] » Dec 01 2010, 7:36pm

I have a 2001 Chevy Silverado 5.3L. I was wondering what kind of Transmission do I have. Right now im to damn lazy to look underneath the truck. Reason being is that I believe that my transmission is going to be going out soon. Right now it is shifting O.K. during normal operations. But Down shifting is the problem. A lot of slippage going on. Rev's high and locks into 2nd and sometimes 3rd.
2012 Silverado 1500 LT 5.3L V8 A.C.E.
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Re: Transmission

Postby jepics » Dec 01 2010, 8:04pm

There are about 400 transmission codes in the GM build codes. They start with the letter M. Look in your glovebox for the Service Parts ID tag. It should look something like the item below, where I have circled M30 - which is the trans I have. Provide the code and we can look it up. I don't want to put all 400 in a post!
gmc-glovebox label-Transmission Code.jpg
gmc-glovebox label-Transmission Code.jpg (91.37 KiB) Viewed 23644 times
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Re: Transmission

Postby Z15 » Dec 02 2010, 12:20am

Only 2 trans for 01 models, you likely have the Automatic Transmission,4L60-E, the other 4L80E is HD


M30 : TRANSMISSION, AUTO 4 SPD, HMD, 4L60E, ELECTRONIC
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Re: Transmission

Postby jepics » Dec 02 2010, 12:56am

So your code would be one of these two:
M30 = TRANSMISSION,AUTOMATIC 4 SPEED,4L60E,ELECTRONIC,4-SPD A/TRANS
M33 = TRANSMISSION,AUTO 4-SPD,4L60-E,ELECTRONIC,HYBRID,A/TRANS


Good luck - hope that helps!
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Re: Transmission

Postby katjar503 » Dec 02 2010, 4:19am

very good info there thanks
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Re: Transmission identification in 01 Silverado

Postby tevans45 » Feb 01 2016, 7:42pm

jepics: I have the same transmission per the code info you gave. Am I able to get a heavier duty transmission put in? I'm pulling a horse trailer... empty 4K lbs, loaded around 6K lbs. 2WD. Was told I could pull up to 8K lbs with this truck,,, 5.7L engine. Thanks in Advance.
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Re: Transmission identification in 01 Silverado

Postby Mattpmoore » Mar 03 2016, 3:49pm

So if I have a 2004 Z71 1500 with the same M30 service parts code would I have the same transmission you listed above?
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Re: Transmission identification in 01 Silverado

Postby 19trax95 » Mar 03 2016, 7:00pm

M30 is the 4l60e.
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Re: Transmission identification in 01 Silverado

Postby Mattpmoore » Mar 03 2016, 8:12pm

Thanks 19trax95!
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