Keith, that wasn’t really the point I was trying to make, he could have gone a lot slower, even down to a crawl, because it appears he had the torque he needed to do so on that slope. Like in sand and snow, a little momentum can help you, but it doesn't last long…
I took some of the torque figures listed here and crunched some numbers. Now of course traction and a myriad of other variables like if they chose the TC stall to correctly coincide with PK torque not withstanding, here are some rough capability calculations:
Of course my 3116, 225@620FT/LB. At peak torque/TC stall and 3.9:1, should deliver 13,200lb of force, It should be able to drag 20K up a 41.3deg slope.
DS Torque 3652FT/LB. 60%
Stock 3126, 274@~800FT/LB. With 3.9:1 at peak torque/TC stall should deliver 17,035lb of thrust. It should be able to drag 24K up 45.2 degrees.
DS Torque 4712FT/LB. 78%
Ckoubas Tweaked 3126, 330@860FT/LB. @3.07:1 and peak torque, you should have 14,414lb of thrust, or enough to drag 24K up a 36.9deg slope.
DS Torque 5066FT/LB. 84%
And Generals C7, 370@931FT/LB. With 3.9:1 and peak torque, thats a whopping 19,823lb of force or enough to drag 21K up a 70deg slope…
DS Torque 5484FT/LB. 91.4%
Found my old notes on driveshafts, anyone know what wall thickness tube ours uses?
Based on 279 U-joints we use type 16 driveshafts(Rockwell/Meritor 16R, Dana-Spicer 1610?) with 4” tubes, they make weld yolks for .109 and .134 wall thickness. The two different thickness shafts are rated at 6000 and 6500FT/LB max torque(peak) respectively. The U-joints have a rated yield of 7100FT/LB.
The percentages I listed above are load related to the 6K shaft rating…
YMMV…