What research? And if your research is correct, then why did you buy a truck with a maxed out motor?

 

Ummm... Yeah, agree with Jeff above. Where did you come to such conclusion? Care to share with us? Pretty sure there are a lot of people who'd like to know.

FWIW, my 07 NNBS had 257K when I sold it five months ago and was still going on just fine.

 

I purchased the truck knowing I would put a used 5.3 in it. I couldn't pass up on the price. It's my second truck while I'm restoring my 94 C1500 stepside. I know this is a "hard to know" question, but with other members knowledge, I would just like to know approximately how many more miles I could get out of it.

 

It's impossible to say how many miles you can get out of it.

Is it the gmt800 style 2007 or the gmt900 style 2007? The gmt800 will be way more likely to go for a long time due to the lack of the garbage afm system.

But even the afm motors can go for a really long time. It's really all in maintenance and luck, but mostly luck. I have seen fleet trucks that are abused all day, every day and not maintained the best, last an extraordinarily long time. I've also seen trucks that are taken care of to a T, fail really early on.

 

I have the bowtie emblem on the tailgate. Wouldn't that make it the GMT900 ? Or more being the 2007 Classic. Please correct me members if I'm wrong. I thank all members for their input.

 

Does it look like the first or second one?

 

No split in jeadlights, and yes, picture 1, the white chevy is my body style

 

Yeah thats the gmt900, which has AFM, and is the biggest detriment to long life on those engines.

 

Yea, I read where the lifters fail from the spring collapsing. What if one replaced the lifters with new ? Is the cost worth it ?

 

You can get a deleted engine for around 4700 it go forever

 

There is no magic number. You might get 50,000 miles out of it or 400,000 miles. If you have an AFM failure at this point, I'd replace the motor and do a full AFM delete on the replacement motor.

 

The only thing that is worth it is a full afm delete. Other than that, I'd never put them back in the motor

 

Hmmm interesting...Thanks for the input guys...Info taken seriously. So how much is involved with a AFM delete, vs. a used 5.3

 

Basically replacing the cam and lifters and associated parts. And you have to do a tune to permanently turn-off AFM in the ECM.

https://www.texas-speed.com/

 

I'd say drive it until it pukes. If you have no audible or other issues with it, your odds are good to make any trip. My 2002 (pre afm) had 243K on the 5.3 before I sold it and like yours, it didn't leak or burn oil, no lifter noise, piston slap, or lower end knocks so I would have driven in across country if I had to.

 

Thanks

 

So what would be good to keep those lifters clean, and oiled ? Seafoam ?

 

Good oil and good oil change intervals. Any good synthetic will work fine and a good filter. I'd recommend 5,000 mile intervals. Dirty oil kills.

 

^^^ All that. Plus disable the AFM with a Range device or a tune. Not going to be a guarantee of anything, but at least,some piece of mind. As has been said, some fail before 100K, some just keep on going.

If you're planning to swap a motor anyway, go with a 6.0 so you don't have to deal with AFM. That was my plan with my old truck if it ever did kick the bucket. But it didn't, so didn't have to execute the plan before I sold the truck. Bought it at 182K, sold it at 257K and it was still going strong. My thinking was if it ain't broke, don't fix it. That thinking doesn't work for everybody, of course. Just something to think about.

 

Just watch what 6.0 you get, because they had afm too for for 1500 trucks. The 6.2, 4.8, and 4.3 in the gmt900 platform did not have afm.

 

Yup. Get one from a 2500.

 

Thanks for everyone's input...Truly appreciated