- #Six speed harley transmission upgrade
- #Six speed harley transmission full
- #Six speed harley transmission professional
I have seen 6 speed transmissions from every major manufacturer needing bearing overhaul around the 20,000 to 30,000 mile range. 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. 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. 89 (roughly) of a revolution while the engine turns one complete revolution. Now enter the 6 speed transmission with a final drive ratio in 6th gear of.
#Six speed harley transmission full
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. T the 5 -speed transmission is meeting its design limits. 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.). This unsupported main shaft design was adequate with a 50 or 60 hp engine putting out low torque numbers. 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. The clutch pack hangs off the end of the shaft and is flexed back and forth by the torque of the engine. The main shaft and the clutch pack is unsupported at the end. 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 six speed transmission uses pretty much the same design as the proven 5 speed design only with an extra gear. The next sentence is not entirely accurate but will suffice for this discussion. I've also heard from very reliable sources that Baker and yes even Harley has have had trouble with their six speed transmission bearings. I have personally seen bearing damage and main shaft bending from the Rev Tech 6 speeds.
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. Chaos Service Bulletin #26 speed transmission bearing failure. Thought I would throw it out here to hear other people thoughts on this.ĭr. Tech Note: These kits will work in 5 spd type 2000/Later models with additional minor modifications.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. We have heard that these may not work on 2006 Softail models with the 200mm Wide tire.ĩ8-902 Ultima 6 Speed Builders Kit 1990 & later Big Twin
#Six speed harley transmission professional
Professional installation is recommended. Ultima 6 Speed Gear sets are the same ones used in our transmissions and are great value products. All Touring FLT and FLH Models 93/L require an oil filler spacer #89-14.
Complete instructions included or available online. The trap door is thicker than stock so any brackets used that are trap door mounted may need modification. These kits will work in 5 spd type 2000/Later models with additional minor modifications.
A speedometer recalibration unit is required on some 1996-2000 and all 2001 later models. These kits work in most 1990-1999 models with little or no modification. The Ultima Six Speed Builders kit was designed to provide a simple, low cost, 6 speed overdrive solution for 1990/L Big twin owners.
#Six speed harley transmission upgrade
ULTIMA 6 SPEED / 6-SPD TRANSMISSION / TRANS BUILDERS KITįITS: 1990-2006 HARLEY SOFTAIL DYNA TOURING TO UPGRADE STOCK 5-SPEED
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