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Do I have DFM model?

Tb21

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Didn’t know about afm/dfm issues before purchasing and would like some clarification on which model I have. Hearing about lifter failures around 5k miles. Only 1700 miles on mine so far no issues.

2021 LT Trailboss 5.3
No auto stop.
Manufacture date 9/21
 

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Blueicebob

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What I’ve found is auto stop and DFM are a package. Chip shortage is why some trucks came like yours. A friend of mine has the same as you. Wish mine was lacking a chip also 😉
 
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Tb21

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You’re saying that I got lucky during the chip shortage and scored one of these without a AFM or DFM chip? At least from what you have heard?
 
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Tb21

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If so that’s awesome. Got something good out of the shortages. Let’s go Brandon.
Since I’ve been driving it I’ve been trying to feel the 4 cylinder only and I can never tell a difference no matter how I drive guess that makes sense now. I kinda feel bad for the majority of people with the chip. AFM/DFM should have never been.
 

Fireman489

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Okay so same question, I do have auto start/stop so I assumed I have dfm, but I can't tell a difference in my exhaust tone either. 21 Lt manufactured just before they pulled start/stop just can't verify date rn and I did a muffler delete fyi.
 

Bender

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Forget about the mileage estimates for the lifter failures. Mine went at 32,400.
 

Mrevilandy

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I do not have auto stop but have dfm. Turned it off tho through pulsar LT. Knew for sure cause of build sheet.
 
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