Goodbye 4.3, AFM 5.3 & 6 Speed

Grumpy Bear · March 11, 2021

1 hour ago, newdude said:

Ah the old 4.3 was not LS based however. The Vortec 4.3 was still Gen 1 small block based and shared nothing with the LS engines.

3800 was a unit for sure. A gen 4 version that was all aluminum with DI, VVT and a 6 speed automatic would have brought it to a sweet spot.

Yes yes, Vortec not LS...my bad...brain farts happen to us old guys. (My story and I'm stick' n to it)

:crackup:

Edited March 11, 2021 by Grumpy Bear

redwngr · March 11, 2021

2 hours ago, OnTheReel said:

We can hope the 10 speed goes across the board, it would make a huge difference.

I don’t follow Cadillac too much anymore but I was surprised to see they are using the L3B in the CT4-V. Uptuned a fair amount to 325hp and 380tq. If GM brings those numbers to the T1’s 2.7, it would actually be comparable to the Ford 2.7.

For now it seems to be the 8 and 10, based on the video -- which claimed to be showing info slides from a GM presentation.

Edited March 11, 2021 by redwngr

JR09country · March 13, 2021

Hmmmm....

I had some suspicion that the 4.3 was done at some point with the way they've been promoting the 2.7T as being more powerful and fuel efficient over it.

4.3 would have benefited from the 8 speed like in the Express/Savana. They drive nice with the 8 over the 6. Shame they aren't keeping it and doing that.

I'm less worried about the 8 speed than the 6 speed which sounds insane but at work, for every 20-30 6L80 we do physical repairs on, we do 1 8L90. Plenty of 8 speed fluid swaps though.

It would be nice to see the 3.0 diesel trickle down to the Custom and WT trims to fill the engine gap.

Also they need to offer a freaking power driver seat on WT and Custom other than optioning the 2.7T which gets you it.

Oooh! Look at that chart in the video about 1:35. The Custom Trail Boss gets the 2.7T as the base engine. No 5.3 either? Just 2.7T and 6.2.

Curious to if the 5.3 is gone for good on the TB custom or just didnt get mentioned. I would think the 2.7 is base motor with the 5.3 and 6.2 as options.

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Transient · March 20, 2021

After what I just witnessed with my neighbor, the 6-speed need to be gone. He bought a 2021 Custom TB. 1100 miles and the trans is toast. He hasn't even made his first payment. Towed his toy hauler once. That was it. He said his toy hauler weighs 5900 lbs unloaded. It is very short. He's only putting small electric motorcycles and 1 or 2 small gas powered bikes in the trailer, along with the typical fluids, foods, etc. His oldest kid is about 12. The people in the family are small and light. I don't see him overloading the truck in payload, tongue, towing, etc. He replaced a 2004 Suburban 2500 with the new Silverado. I feel bad for the guy.

I was burned by GM on the 5.3 with AFM back in 2012. It was in a 2007 Tahoe. 6 months out of warranty, but not out of warranty on mileage. Driving home to Chicago after attending a funeral in Salt Lake City. Got off the freeway in Laramie, WY to fill the gas tank and my families stomachs. Get back on the freeway, at cruise control, start climbing a canyon and the bottom of the engine fails. Needed a new engine. It was going to take at least a week, but my wife was active duty Navy and her command wouldn't grant an extension even though she had the leave time available. GM wasn't going to cover the engine, nor any part of it, and certainly wasn't going to help in any way. We were a young family with a 2 year old kid. I ended up downgrading to a Malibu just to get home. Had to pick and choose which items in the Tahoe went into the dealership's dumpster and what continued on the trip with us. Didn't have the time to ship anything because we had to get back on the road immediately, and everything was closed by the time we finished the paperwork on the Malibu. We lost some valuable family heirlooms because of this. It soured me on GM for several years. I avoided anything with cylinder deactivation until DFM came about. I'm only giving it a chance because of the changes in the technology/mechanicals.

With all that said, the 6-speeds days were numbered when GM decided to put the 8-speed in the Colorado/Canyon. My guess/shot in the dark is that the Custom Trail Boss will still have the 5.3 as an option. It'll just be the 5.3 with DFM and an 8-speed. Therefore, there won't be much differentiating the Custom Trail Boss from the Trail Boss LT. I think the Trail Boss LT will then follow in the GMC AT4's footsteps and have the 3.0 Duramax as an iron in 2022+.

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