40 mph uphill? Other Armada or Titan TVs?
I’ve been trolling this site for a year. There’s so much info I that haven’t needed to ask a question until now! Tv: 2006 Armada LE 5.6L DOHC V8 with factory tow package. Tow rating 9000lbs. 305...
Forum Discussion
Well, I'm sorry fellas, but you happen to be at least partially wrong in "correcting me" regarding dropping a gear in the trans vs changing the rear gear. The comment about the diff being "final gear" as stated is misleading. The way this works is the torque developed by the engine, is multiplied be the ratio in the trans, then multiplied again by the ratio in the diff.
So in reality, the torque available at the drive axle is determined by the "overall ratio" of the trans gear selected and the final ( diff ). The diameter of the tire also effects it, also minus the efficiency losses associated with the gears. But for this discussion, let's ignore the efficiency losses and the tire size.
His Armada has a choice of either a 2.93 or a 3.36 diff gear. Second gear in his five speed trans is 2.37. Third is 1.52. The overall ratio in second gear with the taller 2.93 is 6.94.
The overall ratio of third gear with the lower 3.36 is 5.10.
So.....if he leaves his 2.93 gear in the truck, and uses second gear, he will have more torque to the wheel ( 6.93 vs 5.10 ) than he would in third with a re-geared-to-3.36 diff.
Yes, you guys are correct that if he re-gears, he would "always have more torque available" in any given gear.
But if he thinks regearing is going to allow him to always pull in a higher trans gear, he may be disappointed.
Downshift it. Put your foot in it and let it rev. Use second if you have to. You won't hurt it.
He has no other options for gears in that particular diff case. Nissan had Dana build those cases specifically for them for the Titan/Armada as well as the Frontier ( I have one ) and the Pathfinder. You cannot use off the shelf Dana 44 ( M226 ) gears in them. The pinion shaft is a different diameter and that bearing is a different size.
EDIT, ps, sorry 'dog, I usually agree with you, but I have to disagree with your comment that dropping a gear is a crutch. That is just not true. The reason we have a multiple speed transmission is so that we can "drop a gear" when needed to make more torque avail to pull a load. Try to tell a truck driver with an 18 speed transmission that dropping a gear is a crutch. He is going to look at you like you are nuts.
So in reality, the torque available at the drive axle is determined by the "overall ratio" of the trans gear selected and the final ( diff ). The diameter of the tire also effects it, also minus the efficiency losses associated with the gears. But for this discussion, let's ignore the efficiency losses and the tire size.
His Armada has a choice of either a 2.93 or a 3.36 diff gear. Second gear in his five speed trans is 2.37. Third is 1.52. The overall ratio in second gear with the taller 2.93 is 6.94.
The overall ratio of third gear with the lower 3.36 is 5.10.
So.....if he leaves his 2.93 gear in the truck, and uses second gear, he will have more torque to the wheel ( 6.93 vs 5.10 ) than he would in third with a re-geared-to-3.36 diff.
Yes, you guys are correct that if he re-gears, he would "always have more torque available" in any given gear.
But if he thinks regearing is going to allow him to always pull in a higher trans gear, he may be disappointed.
Downshift it. Put your foot in it and let it rev. Use second if you have to. You won't hurt it.
He has no other options for gears in that particular diff case. Nissan had Dana build those cases specifically for them for the Titan/Armada as well as the Frontier ( I have one ) and the Pathfinder. You cannot use off the shelf Dana 44 ( M226 ) gears in them. The pinion shaft is a different diameter and that bearing is a different size.
EDIT, ps, sorry 'dog, I usually agree with you, but I have to disagree with your comment that dropping a gear is a crutch. That is just not true. The reason we have a multiple speed transmission is so that we can "drop a gear" when needed to make more torque avail to pull a load. Try to tell a truck driver with an 18 speed transmission that dropping a gear is a crutch. He is going to look at you like you are nuts.
