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I have this too. There’s a ton of room to use the tailgate, works great. Unfortunately it does help me when I use the WD hitch for my travel trailer. I can remember it. But my wife, son, other family member, friend, etc... won’t. So I definitely see the appeal to this solution. I wonder if the manual switch version could be wired up to an upfitter switch.

Couldn’t you just install it with some jbweld?

Thanks.

Thanks for the reply. I am inclined to order one and see what I think, but I think I may wait and see some more reviews on it before I do. I am kind of surprised that banks hasn't released any media on the 2020 release. It's almost as if they aren't as excited about this one as they were about the one for the '17-'19's. Not sure. I'm definitely interested to see how the pedal monster interacts with the derringer. And somewhat interested to see if the pedal monster does enough on it's own without the derringer, meaning giving a little more power down low where I think most of us want to see it. One thing is for sure, I like the new transmission so far, but I think it could definitely use a little polishing as far as gear selection, etc.. I think it's the only thing we're overcoming here when we talk about pedal lag, etc...

Where did you get this schematic? I’d lovevto get schematics like this for the whole truck.

I'm pretty disappointed in the results people are experiencing. I was hoping for something a little more dramatic. I feel like 140 ft lbs is a pretty big increase for people to be wondering whether or not they can tell a difference. I was really looking forward to getting a derringer for this truck too... Does anyone feel like the transmission may be what's limiting the truck? Stock, my truck seems to have a lot more lag than my '15 did. From a stop it's pretty powerful. Pulling hills, same. I experience a ton of lag though if I slowly roll a stop sign, or barely come to stop, then a light turns green etc... I feel like the transmission hasn't fully made it down to first gear or something, then I try to go and there's a good second or 2 of lag. I was really hoping for some improvement in this with the derringer. Anybody notice an improvement in this?

Did anyone ever find a fix for this? Mine still does it occasionally. I just try to ignore it. But I would like to get it fixed at some point.

Does the 5th switch always have to be used for snow plow prep? I would like these for adding some auxiliary lighting. I don’t have any need for a snow plow so it would be nice to use that switch for something else.

Just for your reference. The shark fin is not the highest point on these trucks. There are 2 extruded ridges on the roof that are just behind where the sunroof is. The highest point on those ridges is the tallest hard part on the truck. On my 2500 with 20” wheels, that part was about 80.125”. The standard radio antenna is about 0.75” taller than that. The clearance bar for the parking garage at work is 80” and I was barely contacting it. I put som john c garage 1.4” drop shackles in the rear and I now just barely squeak under that bar. Like .125” under. If I don’t have at least a half tank of gas I will barely touch on the passenger side. The garage is actually around 6’11” inside so I’m good. i think you’ll be fine, but your best bet is to test drive one home and check it.

I received my B&W multipro tow and stow today. It is a nice piece of kit. I can’t use it for my travel trailer, but as far as use for my boat or utility trailer, etc... this is perfect. It’s solid too. Very heavy. 2&5/16” ball is 14,500# and the 2” is 7500#. Tongue weight is 1450#. In the packaging it says you can use the step on the truck to its full 375# rating without making contact. There is plenty of room, I have no reason to doubt that at all. Also, it looks like if using the hitch on the lower settings there is no reason to need to stow it to prevent contact. On the higher end it will. Pricey, but totally worth it for these trucks.

Well I guess we’ll find out. I guess the good news here is that the regular Allison works with this motor if all else fails

When I bought my 2015 brand new I had the transmission take a crap after 200 miles. It would only shift into reverse and park. I had a great picture of it on a flatbed the day after I brought it home. They ended up replacing a bad electronic part, and back in business. For the next 94k miles I replaced a def tank heater, and a seat buzzer for the parking sensors. I got a nice bedrug out of the transmission problem when GM customer care called me to apologize about the transmission issue, unprompted. My point is, that was a true Allison. Things happen, that's what warranties are for. I really doubt the 4/5 statement. Mine is smooth as silk, very nice. They'll get it fixed. I drove the first 10k on my 2015 with a mild bit of nausea over the transmission and eventually forgot about it.... I wish I hadn't tiptoed those first 10k, there was no need for it.

Thanks but it's still not working for me for some reason. Sorry, sending you a pm so you can email it to me if you don't mind.

It won’t notify you. On my 2015 my rpm’s at idle would go up and I’d get crap mileage. It would have a dead pedal too. y 2020 seems to be a bit different but I’ve only had 1 regen I know of so far, it was around 800-900 miles. I could smell it and noticed the crap fuel mileage. I didn’t notice a bump up in idle rpm, or a dead pedal. GM has said in the past, their thought is that the truck should regen without the driver noticing. I plan on getting a Banks iDash, if you have one of those, it will tell you when it’s in regen, as well as dpf soot level, etc... pretty useful.