Random transfer case question

[dscowell]

As you gear your transfer case lower does it effect your on road driving like mpgs and what not even when your in 2wd? And what would the difference be between a t-case with a SYE and a t-case with a doubler?

[Robert B]

in 2wd that should not affect anything though the doubler should have 2 sets of 1:1 gears spinning but i dont see that having much if any effect

[Patrolman]

I have dual cases on my 4Runner. It makes no noticeable difference in power or mpg's for my 4Runner. When I am in 2wd, you don't even know the difference except there is an extra shift lever in the cab.

[dscowell]

there is an extra shift lever in the cab.

So with a doubler you can engage one or both transfer cases at any time?

[RidgeRunner]

So with a doubler you can engage one or both transfer cases at any time?

Yes, on a Toyota at least, but it should be the same for a Jeep. I have dual cases in my 4Runner as well and I can do the doubler in low for 2wd low, t-case in low for 4wd low or both in low for super low 4wd.

[Patrolman]

2wd on almost all vehicles is 1:1. Basically, the transfer case in 2wd provides no gear reduction, just a small amount of parasitic power loss. This is negligible though. So when you have dual cases, the combined set is still 1:1, making it like the 2nd case doesn't exist.

An interesting option is dual transmissions because you can then have the same 1:1 in 4th gear in a lot of vehicles with a 5 speed tranny, again making the 2nd transmission seem as though it doesn't exist. Then you just drive it like normal with your regular transmission. If you go into 5th gear in each transmission, you get lower RPMs on the highway. If you need a lower gear for more torque, put both transmissions in a gear lower. For the lowest, both in 1st gear would be creepy crawly.

[gm4x4lover]

An interesting option is dual transmissions because you can then have the same 1:1 in 4th gear in a lot of vehicles with a 5 speed tranny, again making the 2nd transmission seem as though it doesn't exist. Then you just drive it like normal with your regular transmission. If you go into 5th gear in each transmission, you get lower RPMs on the highway. If you need a lower gear for more torque, put both transmissions in a gear lower. For the lowest, both in 1st gear would be creepy crawly.

How interesting you mention dual transmissions. I have been thinking about building a rig with a Sm465 as a second transmission.