MTFCA Forum

How do you shift a Rocky Mountain Transmission on my new 1924 TT Truck?
Thanks

Pretty much like any other non-synchro transmission. Be very aware that you will loose your service brakes any time the transmission is in neutral.
Do you have accessory outside brakes on the rear wheels? The Rocky Mountain is a sliding gear transmission and although it does not have a specific neutral position, there is a brief space between shifts where the input shaft is not coupled to the output shaft.

Thank you for your response. Yes there are accessory outside brakes on the TT. I just didn't know how to shift it or when to shift it. Thanks Mark

If you don't have a foot throttle, you will need to use your left hand to control the throttle while your right hand controls the shift lever. With practice, you can steady the steering wheel in the crotch of your left elbow while reaching across the top of the steering column and grabbing the hand throttle with your left hand. Just takes practice!!

Dan McEachern wrote: ↑

Fri Aug 13, 2021 2:05 am

If you don't have a foot throttle, you will need to use your left hand to control the throttle while your right hand controls the shift lever. With practice, you can steady the steering wheel in the crotch of your left elbow while reaching across the top of the steering column and grabbing the hand throttle with your left hand. Just takes practice!!

Yea that sounds safe? I have seen this "contortionist" method. Not for me.
I vote foot throttle for a center shift rux or transmission.

Why not find a road with no traffic, or a large parking lot, and start practicing? You should be able to figure it out. I used to have a T with a Ruckstell, and a Warford, and had no problems!

What Dan said. I drive my TT with Warford and Ruckstell and no foot throttle. Hold the wheel in your left elbow and work the throttle with that hand. Shifting the RM transmission or any other auxiliary like the Warford is a matter of matching road speed to engine rpm. You have to adjust the rpm to where it would be for road speed in a certain gear before you can shift it into that gear. In-line transmissions like the RM are known to be easier to shift because the inertia of the heavy drive shaft helps out.

I just hold my left hand over the spider near the throttle and use a finger or two to control the throttle. No big deal and not uncomfortable.

Just to go a small step further that no one covered, straight up and down (vertical) with the stick is direct drive, forward with the stick is low and back with the stick is overdrive. Shifting from one gear to another as you're driving along, decelerate a bit depress the clutch and move the stick.

Ed aka #4

YellowTRacer wrote: ↑

Wed Aug 18, 2021 5:08 pm

Just to go a small step further that no one covered, straight up and down (vertical) with the stick is direct drive, forward with the stick is low and back with the stick is overdrive. Shifting from one gear to another as you're driving along, decelerate a bit depress the clutch and move the stick.

Ed aka #4

Thank you all for your help.
Mark