Is there such a thing as a ruxtell overdrive for model t's? I thought they were underdrives. Please enlighten me. Thanks, STEVE
Steve, Ruckstell's are under drive only. If you want an overdrive you have to get an aftermarket transmission like a Warford, etc., which also sometimes have an under drive.
Sometimes when folks install a Ruxtell, they change the ring and pinion ratio to get a higher top speed, while the Ruxtell low still allows more than adequate low gear.
Thanks guys! that's what I thought.
By using a 13 tooth pinion with a 39 tooth ring gear, you can get a 3 to 1 ratio in a ruckstell, a little faster than the standard 3.63 to 1 ratio.
Ruckstell also manufactured their own gear set - 3.25 to 1 or something similar.
I have 2 Ruckstells and one has 3:1 Ruckstell marked gears.
The Ruckstell Axle written by Bruce McCalley,
Gives the ratios and calls the 3:1 as over-drive gears.
I could use some help here too, am rebuilding a ruckstell and the ring gear shows a little more ware than I like, so it took the ring gear from another rearend I had. It looks the same but the old one has a 8 ford 7 stamped on it the new one has 0 ford 7, are they interchangeable?
My Ruckstell has ring and pinion from Ruckstell and they are 13 and 40. From my gear design class in college, more uniform gear wear is offered if there is an odd ratio such as 13 and 40. With 13 and 39 the same gears come in mesh every 3 revolutions.
The "high speed" gears were a complete surprise to me when I took my Ruckstell apart. It is about 20% taller than stock so my car runs at 30 mph at the same rpm as a standard ratio car at 25 mph.