Engine on AT4
- Thread starter LamboTexas
- Start date
AT4 CP
New member
My buddy advised me the 5.3 is the most reliable engine on GMCs but I wanted that extra oomph and I’m glad I went with the 6.2. It’s weird. When I was driving around in Mercedes and NSX, I didn’t get as many compliments as I get with the AT4.
Many people seem to hate on the small 2 seaters but for some reason, they love trucks, AT4 in particular.
Many people seem to hate on the small 2 seaters but for some reason, they love trucks, AT4 in particular.
Regular Cab Duallies
"RCD"
3.0 DMAX is the engine for me... I just love diesels 
Ideally it will be in a Yukon AT4, even if I have to swap it in there. As for reliability, I really like mods, so I shouldn't any problem doing mods to prevent any issues. I too have heard the 5.3 is the most reliable.
Ideally it will be in a Yukon AT4, even if I have to swap it in there. As for reliability, I really like mods, so I shouldn't any problem doing mods to prevent any issues. I too have heard the 5.3 is the most reliable.
Riverdog
Active member
I had duramax 6.6L in my last 3 HD trucks and loved the engine. However, I didn't care for the maintenance, fuel filters, def fluid etc.... ( I miss my LBZ) This time around I'm towing MUCH less so I didn't need the HD. I got the 6.2L because, they didn't make it with a 6.3L 
OP
LamboTexas
Well-known member
- Thread Starter
- #6
Very similar to why I chose the 6.2I had duramax 6.6L in my last 3 HD trucks and loved the engine. However, I didn't care for the maintenance, fuel filters, def fluid etc.... ( I miss my LBZ) This time around I'm towing MUCH less so I didn't need the HD. I got the 6.2L because, they didn't make it with a 6.3L
Riverdog
Active member
Most of my towing these days is motorcycles, maybe a small tractor, jeeps and hotrods etc... but nothing too heavy. Except.....next week I have to drive to Vermont to pick up our sprinter camper van that's been in the shop since it broke down in July. That thing is a heavy pig, even with my aluminum car hauler only weighing 1900 lbs......once I load that sprinter I'll be over the recommended towing capacity. But it's a 6 hour drive....my trailers got brakes on both axles, and I'm just going to take it easy. I'm sure the 6.2L has the power, it's just the gearing and probably the lift that hurts it's towing capacity?
OP
LamboTexas
Well-known member
- Thread Starter
- #8
Be safe
Riverdog
Active member
It may not be over.....my truck says 8,800 lbs. I know my trailer's 1900 so that leaves me 6900 lbs.....my sprinter weighed about 5500 as a cargo van...with the camper build out.....no idea...but I'm sure it's close.
OP
LamboTexas
Well-known member
- Thread Starter
- #10
You should be fine- like you said just slow and easy
Duramaximus
Well-known member
Same here. I didn't want to worry about the DEF, EGR, etc so I went back to a gasser. Plus, the old LBZ was in the garage every weekend fixing odds and ends.I had duramax 6.6L in my last 3 HD trucks and loved the engine. However, I didn't care for the maintenance, fuel filters, def fluid etc.... ( I miss my LBZ) This time around I'm towing MUCH less so I didn't need the HD. I got the 6.2L because, they didn't make it with a 6.3L
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Andystoy AT4
Active member
I owned a 2009 LMM DRW truck with a banks 6 pack tuner and traded to a 3500 HD 6.0L in 2016. The sixteen was a very nice truck but very heavy on fuel. After watching the LM2 3.0 for a couple of years I decided to order a 2022 Refreshed with the 3.0 and so far only 3 weeks in am very satisfied with the powertrain. I use about 1/2 the fuel on the LM2 and I realize that the 1500 is a lighter truck than the 3500 HD SRW was. Both of my previous trucks had zero power train issues.
The 6.2 has more HP for passing etc. but the gas engines have had lifter issues as well, so the Duramax 3.0 was my choice. Time will tell?
The 6.2 has more HP for passing etc. but the gas engines have had lifter issues as well, so the Duramax 3.0 was my choice.
Time will tell?
Big Kahuna
Active member
I come from ram Laramie and only reason I change is the 6.2 engine, to be totally honest if ram offered the mighty 6.4 hemi in the 1500 I would have never come over to GMC , but that being said, I do love my new 2023 gmc AT4
gharvey
New member
Is the 5.3 even offered anymore? It's not on the build sheet for the AT4.
