2020_3500HD

I found and attached the tsb from when I had my 2015 truck. It has a chart showing approx crank times associated with different temps.

If the outside temp is cold (can’t remember the exact cut off) the gm di motors will have an extended crank time. I experienced this on my previous truck 2015 half ton and my 2020 6.6 truck does the same. Has to do with making sure proper fuel pressure is built up before firing the injectors. Hope this helps.

I live in Indiana so not too many big grades here but towing into a decent head wind I have not had any problems maintaining speed with it staying in 5th

I got the 3500 for the added payload/5th wheel hitch weight capacity also I have had 15k behind the truck before for about 100 mile tow and didn’t see myself needing anymore power. I for one like the tried and true 6 speed that the truck has and have not found myself in a situation needing more gears. If you go the gm route get the 5th wheel prep package the puck system is very nice to have.

Yes I know the op stated that the dealer in Canada had put that in his truck was trying to advise him to get it changed back to the spec.

I have never found myself needing more power. I too live in Indiana and a couple months back towed a similar weight travel trailer through the Smokey mountains and had no issues maintaining speed on the grades. This is my 2nd truck with the 6l90 transmission and knock on wood neither have given me any troubles. I do agree that axle options would be nice but the 3.73 seems to be a good middle ground for decent fuel mileage unloaded. I too have the 3500 and have not found myself needing more payload capacity. Hope this review helps in your decision making.

I don’t believe that the 6.6 has the resonator due to not having AFM/DFM. I don’t remember seeing one under my truck.

I have a regular cab 1 ton w/t and I find the seats just fine. I agree with MTU get the 18” wheel package better ride and it fills out the wheel wells much better too.

The fluid is in there while parts are being used for the first time right??? Hence “break in”.

Grumpy, why the red line over the amsoil? I am coming up on my 5000 mi get the breakin fluid out change and if you can let me know why? I have always used Amsoil before but am open to others if it is better for my application by the way I have the 6l90 transmission. Thanks in advance

Maxed the truck out the other day hauling dads 5th wheel no issues here. These trucks do their best when around 3500 to 4000 rpm keep it there and have never noticed a lack of power.

I also doubt it would be standard. From my point of view I like the 6 speed be it crude and have its normal gm 6 speed issues it is rock solid and the other 2 I have had were trouble free for 250k plus miles.

I feel the same from time to time but only in 3rd gear. My previous 6.0 truck with the 6l90 would do the same thing and it never missed a beat in the 200k plus I owned it. I am just glad I don’t have the 2-3 flare that my previous truck had since tuning is out of the picture with these new trucks. Hope this info helps.

Yes the 0w20 is thin for our motors. Up there in Canada if you wanted you could use a 0w30 to help with the cold starts but I would be concerned with the 20 weight oil once up to temp. It states right in the owners manual to use either the 5w30 or 0w30 for temps below -20 F