AWD not so much in reverse
12-10-2017, 09:10 PM
#1
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AWD not so much in reverse
I’ve driven my 08 denali in the snow several times. But this weekend we where up in the mountains while it dumped about 6 to 8” of snow. The cabin we rented had a long steep driveway with a small turn around area on a slight slant. In forward I could go anywhere I wanted. But as soon as I turned around and tried to back up a slight incline in the snow. Just my back tires would spin and I couldn’t go anywhere but forward. In reverse the front tires wouldn’t even try to spin.
This is really sucks for a tight situation
This is really sucks for a tight situation
12-11-2017, 10:38 AM
#3
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Well I read up on it some and apparently it's something they changed in 07+ trucks AWD denalis. Something about it being an open diff front end and it uses the ABS sensor to detect wheel spin. It's over my head, all I know is if I was stuck and only had the option to back up I would be screwed.
12-11-2017, 12:53 PM
#4
Well I read up on it some and apparently it's something they changed in 07+ trucks AWD denalis. Something about it being an open diff front end and it uses the ABS sensor to detect wheel spin. It's over my head, all I know is if I was stuck and only had the option to back up I would be screwed.
12-12-2017, 07:40 AM
#6
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Still sucks to be in a sticky situation and have to get out and pull a fuse. And even worse to have to pull a fuse just to back up a snow covered drive way on a slight angle.
I mean I was proud of the steep driveway the truck climbed to get to the cabin. But to only get stuck trying to back up something I felt like a mini van could have backed up.
I mean I was proud of the steep driveway the truck climbed to get to the cabin. But to only get stuck trying to back up something I felt like a mini van could have backed up.
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12-13-2017, 05:52 AM
#8
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your truck should have a BW 4485 t case wich is essentially just an open differential case. it operates exactly like an open differential in a rear axle. transmits power to the drive axle with the LEAST traction.
Your AWD system runs 3 open differentials. Front diff is open, rear diff is open, and transfer case is open. GM uses active braking to move power to the area with the most traction. Example. if the rears slip, it will apply the brakes on the rear axle to bias some more power to the fronts that have more traction. it can even go as far as biasing power to individual wheels.
what most people dont realize is that you have to slowly apply throttle to allow the active braking system a chance to catch up. if you just stab the throttle, you are likley to just spin the wheels.
Your AWD system runs 3 open differentials. Front diff is open, rear diff is open, and transfer case is open. GM uses active braking to move power to the area with the most traction. Example. if the rears slip, it will apply the brakes on the rear axle to bias some more power to the fronts that have more traction. it can even go as far as biasing power to individual wheels.
what most people dont realize is that you have to slowly apply throttle to allow the active braking system a chance to catch up. if you just stab the throttle, you are likley to just spin the wheels.
12-15-2017, 09:59 AM
#9
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I had two days to play with it in the snow. Ever time I came back to the cabin. I would turn around and try to back up the hill. And every time the back wheels started spinning it wouldn't go any father.
I even tried holding the brakes while easing into the gas to trick the system and it was no different.
I even tried holding the brakes while easing into the gas to trick the system and it was no different.
