Dannycameo
Member
I have a 2019 2500 with the 6.4 hemi and mine will go into 8th with tow haul mode on. It has only done it twice, but it has done it. The first time it did, I was shocked. Had to double check that I was in tow haul mode...I was. I was going roughly 62-65 mph towing our 11k fifth wheel on a probably 2 or 3% downhill grade when it happened. I think it has to be absolutely perfect in order for it to happen. It downshifted back to 7th even before I hit perfectly flat ground.
As one other member mentioned or mentioned I know that 7th and 8th are basically overdrive gears on the 8 speed.I have a 2019 2500 with the 6.4 hemi and mine will go into 8th with tow haul mode on. It has only done it twice, but it has done it. The first time it did, I was shocked. Had to double check that I was in tow haul mode...I was. I was going roughly 62-65 mph towing our 11k fifth wheel on a probably 2 or 3% downhill grade when it happened. I think it has to be absolutely perfect in order for it to happen. It downshifted back to 7th even before I hit perfectly flat ground.
So I guess in theory there's no reason it shouldn't go into 8th if the situation is just right, In theory, And a couple of you have reported that it has gone into 8th for you.
I have yet to find that situation towing, I should also mention I have 37" MT's tires on on my power wagon which also Adds to the mix.
I think the combo the 411 gears of the power wagon and 37 MT's, versus 392 or 321 also plays a large part of the difference.
Since I changed to the 37's at At 300 km I've never had a chance to tow with the power wagon with the stock 33's or even 35's for that matter.
Yet I can tell you that when I was towing on a couple of trips the light off road trailer, it's about 700 miles each way so I had plenty of time any of time to watch the gears from start stops and and where it like to sit on the highway.
I will be towing again this time into the rocky mountains in about 3 weeks with the same trailer I will be interested to see on some of the steep downgrades if I do get into 8th.
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