3/4 Ton Suburban Transmission.
This is a fuzzy DISCUSSION post. After getting a new Chevrolet 1500 6-cyl truck for work vs. our Trailer vehicle (2011 3/4 Ton Suburban)- the Suburban seems to perform awful- nasty shifting habits an...
Forum Discussion
APT wrote:
I think the high engine speed you notice downhill is engine grade braking.
No...
On flat to slight (and I mean slight) downgrades, it is still in fourth).
In fact, on a typical mountainous interstate, and 5% downgrade with all the yellow signs 'the rig' brakes just fine from wind drag with the tranny in neutral.
Without the camper, it speeds way up and I've even felt the brakes get warm. With the camper, it maintains around 70 very nicely.
I have had it downshift for braking, but know the difference. In particular, I have my foot almost always off the gas AND the car going FASTER than the cruise control.
The issue I am talking about is you've just topped a hill in fourth gear, level off and it never upshifts...
Not only that, but I observe differing behavior through the day- sometimes it does upshift, other times it does not. A most mysterious black box runs the thing.
Oh, one more fun story- one day- somehow I got some bad gasoline. You could tell the engine lacked power...That day, the transmission was giving me low gears with the light trailer and struggling to do 70. Got off and bought 10 gallons of premium and boom- cured.
