High gear ratio in transfer case

[Elliott]

What is the high gear ratio in most transfer cases?

 

[86tank]

1:1 on most I know of.

 

[Elliott]

That's what I was thinking, But wonder why no one has come out with different ratios for crawler cases.I realize you can get a 3 speed case and have your other range but what if you just wanted a 2 speed case, it would be nice to have a high range that was usuable in the trails

 

[Elliott]

Imagine if you had a case with a 4.5 to one and a 3 to one in the same case,or even if it was a 2:1. In high gear. That would be a sweet set up.

 

[86tank]

yea 2:1 would be nice then be able to have like a 4:1 low. Then you could run a higher r&p for rock bouncing and not need a real high hp motor. A 4 speed Atlas would be nice but its just pricey and a doubler is longer and probably be hard to package for a buggy. I know I cant run a doubler in my buggy because my rear driveline would be about a foot long. Id like the doubler with a Lomax in the 205 for more options (1:1, 2:1, 3:1, 6:1). im liking my bugg with 4.10s and a 205 but im only running 38s. If i ever go with a bigger tire Im going to have to regear either the case or the axles.

 

[Elliott]

I really can't believe that some company hasnt came out with a setup like this

 

[Markrobinson]

Something like what samurai case aftermarket gears do - most have an underdrive high range. Thats why those guys can run stock 4:10 Toyota axles and 50HP

 

[Elliott]

Samies. Usually run the 6.5 to 1 gear sets. But that's their low range not the high

 

[patooyee]

The high range in a stock Sami case is 1.3:1, presumably to help the shitty motor. You can get aftermarket gear sets that lower the high range, also.

High range in all other normal t-cases (205, 203, Atlas, STAK, d300, etc.) is 1:1.

I'm not sure that something like a 2:1 high range would sell. most people are trying to go faster and faster these days (KOH) and 2:1 would be limiting to them I think. In fact, I bet some of them wish someone made a t-case with an OVERDRIVE high range, not an UNDERDRIVE. That would allow them to run low axle ratios to protect the drivetrain and crawl in low gear through the rock sections and then go to high range to haul major ass.

J. J.

 

[Elliott]

That would be fine for racing but for trails and rock bouncing around these parts we never see high speeds at all.I've got a Buggie I'm fixing to build for one of my buddies that had a crawl ratio of 29 right now in his current Buggie, his new one will be 39 but he is wanting to be able to use high range more, without a medium gearing set he will still be limited, just like all the other rigs around Tn.I think they would prob be very sellable,I agree prob not for racing but deffinately trail rigs?

 

[Travis]

I would like a lower high range for racing. In theory, my rig will top out around 135. I have no need or desire to go that fast. It would be much more beneficial to have a 1.3 or so high range, so top speed would be around 100, but get there quicker. This racing is like 100 1/8-1/2 mile drag races over the course of a few hours.

 

[blacksheep10]

guys, are you going to put both front and rear outputs over at the side like a sami or rover? Or are we going to put 3 rows of gears in there to get your 2 low ranges? The reason for 1:1 is because in rear high, you lock the front input to the rear output. In low, the power travels from teh input to the countershaft, back out the countershaft via a smaller gear on the rear of it to the rear output with a bigger gear. This is your reduction. How would you make 2 reductions without another row of gears? OR you put both outputs outboard of the input....or a range box ala 4 speed/203. One uses planets, one uses gears/countershaft. Pick your poison. Either way you have a third set of gears there (stak 3 speed, 203 doubler or planet doubler)