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2006 vs 2009 for towing questions

Re: 2006 vs 2009 for towing questions

Postby MotorEng91 » Jan 20 2021, 7:58pm

That tire size is stock on the higher trim level trucks so it should not be causing the problem. You should have your stock tire size inside the driver door jamb. If there is a large mismatch between actual tire size and what is programmed in the computer, it can throw off shift points. You can change that with a handheld tuner or a shop or dealer can do that for you. It may help a little but I don't know if that is the entire problem or not.

About AFM, it can be tuned out and it theoretically should reduce the probability of failure. But the lifters are held together internally only by small spring pressure and they still can break and send metal through the engine without being activated.
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Re: 2006 vs 2009 for towing questions

Postby cbibb [OP] » Jan 20 2021, 10:10pm

What year did the AFM start? The reason I ask is I see some 2007 and 2008 Silverados they have a much more modern looking interior than mine does. And actually the front end looks updated as well. And if those have those features that I'm looking for but don't have the problems associated with the AFM that could be a win-win for me
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Re: 2006 vs 2009 for towing questions

Postby Tatsngats » Jan 20 2021, 10:13pm

2007.5 is when AFM started.
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Re: 2006 vs 2009 for towing questions

Postby cbibb [OP] » Jan 20 2021, 10:18pm

Gotcha so it's probably safe to assume the more modern-looking with him seeing have the AFM? Is there a way to tell by looking at the truck if it has the AFM or not?

And to disable the AFM I need to change the cam and lifters? Is that it?
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Re: 2006 vs 2009 for towing questions

Postby 19trax95 » Jan 20 2021, 10:22pm

All of the 5.3 and 6.0 engines in the gmt900 trucks, (2007.5-13) have AFM. The 4.3, 4.8, and 6.2 did not have AFM in the gmt900 trucks.

Moving upto the k2xx (2014-2019LD), all the engine choices had AFM.

To simply disable the AFM, you only need a tune or range module. To fully delete it, you'll need a cam, lifters, and all the ancillary parts to go along with it.
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Re: 2006 vs 2009 for towing questions

Postby cbibb [OP] » Jan 20 2021, 10:30pm

Okay thank you very much. I really appreciate all you guys putting up with my dumb questions. I definitely have a much better Direction on where to go now. And a lot more information to go on than what I had before. Thanks again
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Re: 2006 vs 2009 for towing questions

Postby GOAT721 » Jan 21 2021, 1:57pm

there is no need for a 2500 or 250 to tow the loads you are pulling. your truck SHOULD handle it easily.

do you have a friend with a 5.3 that would let you do a trial tow with his truck to see if it feels the same?
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