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*TT Rocky-Mountain 6spd ratios*
Posted: Fri Sep 01, 2023 10:57 pm
by ClaytonPaddison
Does anyone know what the Rocky-Mountain 6spd ratios are for low, direct and Overdrive?
I have the chance to acquire one and I'm just curious if it would be a better or equal to the Iron Warford I have set aside for it.
Re: *TT Rocky-Mountain 6spd ratios*
Posted: Sun Sep 03, 2023 11:36 am
by Original Smith
I had the pleasure of seeing a 1911 T with a Rocky Mountain transmission this past week. It seems like a way better idea than a Warford. It gives a better weight distribution that's for sure!
Re: *TT Rocky-Mountain 6spd ratios*
Posted: Sun Sep 03, 2023 2:30 pm
by ClaytonPaddison
Original Smith wrote: ↑Sun Sep 03, 2023 11:36 am
I had the pleasure of seeing a 1911 T with a Rocky Mountain transmission this past week. It seems like a way better idea than a Warford. It gives a better weight distribution that's for sure!
I agree, I like the concept as well as the sequential "gears always in mesh" design. I just need to know if it's worth my time (with a tall enough OD ratio) to equal or best my warford.
That will tell me which box to install...ans if I can run my Hybrid AA gears.
Re: *TT Rocky-Mountain 6spd ratios*
Posted: Sun Sep 03, 2023 5:56 pm
by Wayne Sheldon
Are you sure that is a "six speed"? (Actually a three speed progressive shift times the Ford planetary two!) The shape of the case doesn't look like any of the three "six speed" transmissions I had.
I don't know what the overdrive ratio was in the TT version I had many years ago. I sold it instead of using it. And I never did figure out what the ratio was in the Rocky Mountain six speed that was in the 1924 coupe I had (likely different than the TT version?). I wasn't able to drive it much while I had it.
However, the "Universal" version of the six speed I used in my first boat-tail roadster had one of the tallest overdrives I ever saw. One turn in became one and two-thirds out! That is an overdrive of sixty-six percent over! Most overdrives are about thirty percent or less. Many are around only twenty percent over in overdrive. With four to one ring and pinion it was a really nice setup!
If you can, check out the transmissions and count the turns in and out. I would be curious to find out if that was as high as the one in my first boat-tail. It was almost too much.
Re: *TT Rocky-Mountain 6spd ratios*
Posted: Sun Sep 03, 2023 8:13 pm
by ClaytonPaddison
Wayne Sheldon wrote: ↑Sun Sep 03, 2023 5:56 pm
Are you sure that is a "six speed"? (Actually a three speed progressive shift times the Ford planetary two!) The shape of the case doesn't look like any of the three "six speed" transmissions I had.
I don't know what the overdrive ratio was in the TT version I had many years ago. I sold it instead of using it. And I never did figure out what the ratio was in the Rocky Mountain six speed that was in the 1924 coupe I had (likely different than the TT version?). I wasn't able to drive it much while I had it.
However, the "Universal" version of the six speed I used in my first boat-tail roadster had one of the tallest overdrives I ever saw. One turn in became one and two-thirds out! That is an overdrive of sixty-six percent over! Most overdrives are about thirty percent or less. Many are around only twenty percent over in overdrive. With four to one ring and pinion it was a really nice setup!
If you can, check out the transmissions and count the turns in and out. I would be curious to find out if that was as high as the one in my first boat-tail. It was almost too much.
According to Rocky-Mountain's ads, they offered a 4-spd and a 6-spd version this one is labeled as a 6spd.
I believe Universal was eventually bought out by Rocky-Mountain and simply changed the name on the castings at the least. I'll see if I can get a look at it and count rotations.