I too don't use 6th unless I'm cruising on the highway 70 or better. Yes, an outer bearing support would be wise if your running an open primary...
.Same here, need instructions on alignment of transmission and belt. Removed my transmission to replace the bearings and now my belt wants to ride on the outer edge of both pulleys no matter how I adjust the rear wheel.
Valid points on torque and accelerating in 6th gear but your facts and math are off in other regards.While searching the Internet to learn what makes the baker 6 speed, how it is made and researching bearing failures, I ran across this article. Thought I would throw it out here to hear other people thoughts on this.
Dr. Chaos Service Bulletin #26 speed transmission bearing failure.
There has have been numerous reports on trap door bearings and the main shaft main ball bearing going bad prematurely on six speed transmissions on all makes. I have personally seen bearing damage and main shaft bending from the Rev Tech 6 speeds. I've also heard from very reliable sources that Baker and yes even Harley has have had trouble with their six speed transmission bearings. The next sentence is not entirely accurate but will suffice for this discussion. The six speed transmission uses pretty much the same design as the proven 5 speed design only with an extra gear. The problem is, is with the main shaft and the fact that the clutch pack is mounted so far away from the shaft support which is the main shaft ball bearing. The main shaft and the clutch pack is unsupported at the end. The clutch pack hangs off the end of the shaft and is flexed back and forth by the torque of the engine. The tightness of the primary chain and the secondary drive belt also contribute to stress on the main shaft bearing, which then this transfers the force to the trap door bearings. This unsupported main shaft design was adequate with a 50 or 60 hp engine putting out low torque numbers. With the recent trend in high HP and high torque engines and ever increasing and cheap affordable cubic inch upgrades, like for the Twin Cam (95 cu in.). T the 5 -speed transmission is meeting its design limits. Remember the stock 5 speed transmission in 5th gear is a 1 to 1 ratio, which turns the rear wheel one revolution for every full revolution of the engine. Now enter the 6 speed transmission with a final drive ratio in 6th gear of .83 to .89 (overdrive). Which means the rear wheel turns only .83 to .89 (roughly) of a revolution while the engine turns one complete revolution. This means that there is a lot more torque being transmitted to the unsupported main shaft with the same clutch basket hanging off of the unsupported end of the shaft. What this does is stress out the main shaft bearings and the trap door bearings prematurely before their time causing transmission failure or at the very least an early rebuild. I have seen 6 speed transmissions from every major manufacturer needing bearing overhaul around the 20,000 to 30,000 mile range. Which is way too early! I think there is something we can do to slow down this process considerably. I think we are riding these 6 speeds all wrong (me included). I think we are accelerating far too often in 6th gear and not down shifting to 5th gear as we should. We do this because we can. We now have so much more torque with these more powerful engines that we can accelerate in 6th gear without downshifting. I believe This is the problem. If we do all our accelerating in 5th gear, then once we reach cruising speed, then and only then shift into 6th for cruising. That way no excess torque is placed on the unsupported main shaft and our aftermarket transmissions will and should last longer. Just my two cents.
DSSC is a complete drivetrain unit consisting of a Right Side Drive transmission and an enclosed primary drive. The inner primary, outer primary, tranny case, trap door, top cover, and pulley shroud are all carved out of 6061-T6 billet. We cut no corners to make this premium drivetrain look like Tiffany jewelry and take punishment from a big inch motor.
05 is the year I upgraded my Vintage to a six speed. Fortunately, my then Big Dog mechanic was going to a show where the Baker boys were showing off the new six speed tranny and were strongly advocating the new gearing that delivered a 1:1 in sixth gear. I chose that option and am really glad I did. That was 40,000 miles ago and she still sings.Baker introduced the DD6 (Direct Drive 6 spd) and BDM adapted it with the introduction of the 05 models.
Earlier models used the OD6!
Baker still offers both tranny's.