rear end ratio
OK so I feel I am stressing the truck to much in hilly conditions pulling my 5th wheel camper, seems fine out on open road but needs help near the lakes and camp grounds going up those sometimes large...
Forum Discussion
4L80E Gear ratios:
1 2 3 4 R
2.48 1.48 1.00 0.75 2.07
Here is how power is transmitted to the pavement
2.48 x 410 ft/lbs of torque = 1,016 ft/lbs of torque delivered to my transfer case
If it is in 'high', it is a 1:1
1,016 ft/lbs of torque to the diff x 4.1 = 4,168 ft/lbs of torque to the rear
drive axles
If I go with a gear spliter and a 0.7 ratio and 4.5's in the diff...that would
mean
1,016 x 0.7 x 4.5 = 3,200 ft/lbs in first and plenty of power for me
Or can go with a 0.8 ratio for the gear splitter, or whatever other ratios they
have
Here is what 4th gear of the 4L80E would look like:
0.75 x 410 = 307.5 to the diff x 4.1 1,260 ft/lbs of torque to the rear axles
now in OD
1,260 x .7 = 882 ft/lbs to the rear axles in 4th gear (OD) and plenty to cruise
and get better MPG...but am not after or willing toss performance for MPG
1 2 3 4 R
2.48 1.48 1.00 0.75 2.07
Here is how power is transmitted to the pavement
2.48 x 410 ft/lbs of torque = 1,016 ft/lbs of torque delivered to my transfer case
If it is in 'high', it is a 1:1
1,016 ft/lbs of torque to the diff x 4.1 = 4,168 ft/lbs of torque to the rear
drive axles
If I go with a gear spliter and a 0.7 ratio and 4.5's in the diff...that would
mean
1,016 x 0.7 x 4.5 = 3,200 ft/lbs in first and plenty of power for me
Or can go with a 0.8 ratio for the gear splitter, or whatever other ratios they
have
Here is what 4th gear of the 4L80E would look like:
0.75 x 410 = 307.5 to the diff x 4.1 1,260 ft/lbs of torque to the rear axles
now in OD
1,260 x .7 = 882 ft/lbs to the rear axles in 4th gear (OD) and plenty to cruise
and get better MPG...but am not after or willing toss performance for MPG
