L8T

Don’t waste your time or money on a catch can. Just run an oil that’s recommended for this engine, change it when it gets to the add mark or oil life says to, and run an intake cleaner every 3rd oil change and you won’t have any problems. DI engines are known for 2 things, oil consumption and carbon build up on the back of the valves. I’ve owned several different DI engine powered vehicles and this has been common across all of them. I’ve tried catch cans and additives and the problems they created in the end weren’t worth any of the issues I was trying to eliminate.

This will never happen. The Allison is heavy internally and will rob too much hp to make it viable. Not to mention awful fuel economy. Hence why they dropped the 8.1/ally combo years ago.

I drive a 7.3 F-550 with a 10 speed every day at work. Granted it’s a heavy service truck with lower rear gear ratio than my 3500HD gas but it drives so much better. I absolutely hate the 6 speed in this gas truck. It wouldn’t be so bad if I could tune it like I could the 6 speed diesels because there is a lot left on the table for driveability, but seeing as nobody wants to bother cracking the gm ecm the only choice is to hope for more gears. Personally I don’t mind the truck I have but I will wait for either tuning to come available or more gears in a newer truck and after driving this one would recommend others do the same.

Agreed. If you have the same offset and can clear 35/12.5’s I should be plenty good lifting the same amount as you did. Thanks for the info.

Nice looking rig. What size tires and rim offset? I went with 20x10 -18 with 285/65R20 Toyo C/T’s and just turning up the bars isn’t quite enough on the front to keep from rubbing. (Picture is with the Radar Renegade’s I briefly ran)

They make all sorts of different u bolts so if that’s all it is I still don’t understand why companies can’t put a kit together. With that 3” cognito and 1” block did it sit level or have a bit of a rake still?

I’ve got a ‘20 3500HD SRW and for some reason almost every lift maker out there makes them for 2500’s but only a couple do the 3500’s. Some of the fitment comments I’ve found say they won’t work with overloads. For instance the Superlift P/N K1013 3” UCA lift says it won’t work with overloads but they list it for the 3500HD. I’ve reached out to them but no response. Every 3500 has overloads since 2001 so why now do they not make kits? What is so different about the 3500 with overloads that they can’t make a kit? In the past it was just a longer u-bolt required. Anyone in the know about this?

Same on my AT4. Switched to LED and no issues.

Might need a little key bump to clear but probably only 1 turn.

Mine just started flaring the 2-3 shift on occasion. Hopefully that’s just a software fluke and not a hard parts failure on the horizon.

They are nothing alike. More accurately they are a heavier built updated version of the 6 speed that came behind the previous 6 liter trucks. Reliability is probably their strongest plus.

I see K&N has an open top air box design available now. https://www.knfilters.com/gmc/sierra-3500-hd/6.6l-v8-gas/2020/ Has anyone looked into or tried using the ram air from the hood that the diesels use in a gas truck yet? Might be a nice combo with the K&N CAI if a person can make it fit.

So after waiting almost 4 months for my new trailer rims to show up I finally got the gm sensors that I bought with the truck installed. And of course they didn’t work. Could wake them up but the truck wouldn’t read them. Went to the dealer and they couldn’t get them to read either. So an hour or so later while they were still scratching themselves trying to figure it out I got the idea to build a new trailer profile and try it again. Sumbitch if they didn’t work with the new profile!! Deleted the old profile and carried on. Sure is sweet being able to see the pressure and temp as I cruise down the highway!!

Does anyone have pics of the kicker sub kit installed?