Originally Posted by fun2drive
This is a common issue that my Jeep will go anywhere. Nope. Your power is driving forward not upward. The torque has to translate from horizontal to vertical and ran out of torque as noted before. Using low which is for situations like this provides a great deal of added torque multiplication.
If you had some momentum you would have had success.
This puts a great deal of stress on the entire drivetrain by the way and will cause a rapid rise in transmission temperature as the torque converter works hard to overcome this stopped condition.
Ok I agree the power is reduced going up a hill fwd or rev; the equation is Pb = Pt * cos(b), where B is the angle. If I let B = 30 deg, then available power will be P*.866 or 87% of maximum, not counting other factors.
The 8sp ZF tranny gear ratios are (I think):
Low range is 2.72
Axle ratio is 3.45
In reverse the final drive ratio is 3.295 x 3.45 = 11.37
In reverse with 4x4L it is 3.295 x 3.45 x 2.72 = 30.0
Hell, it seems like I can try to go up the hill in 2nd gear and still bog down! I'll try that tomorrow. Sheesh