Synthetic V-Twin Motorcycle Oil meets JASO MA/MA2 standards and is wet-clutch compatible for excellent performance in the primary chaincase. Ironhead Transmission. Synthetic V-Twin Primary Fluid also clings well to the chain for excellent wear protection. Speaking of Recalls. If you want to keep the original parts, and overdrive will help, but it's a PITA. The transmission countershaft rides between an open needle bearing in the trap door and a closed needle bearing in the right engine case.
This transmission case will fit earlier big twin frames. 3-Speed + overdrive RPM loss on shift. This reduces engine speed by this amount, changing a 34 tooth into the equivalent of a 38 tooth, and increasing top speed by 12. Since 1935, there have been four different ratio gearsets used: two standard and two close-ratio. 11 Things You Need to Know about Ford & GM’s 10-Speed Transmission Page 1 of 0. What's your opinion on that? Conceived with economy in mind, the expectation was that both companies would explore certain economies, thanks to the maximization of parts commonality. The company's four-speed transmission design was solid enough to remain virtually unchanged from its introduction in the 1930s until its retirement in the 1980s, but during that half century, many Harley riders wished for one more gear at the top. Despite its relatively wide spread between 1st and 10th gear, the overall span for the 10-speed transmission is hardly the widest out there.
Optimized Operation. 5th gear in our OD6 has a 1:1 ratio. With a complete absence of cast-iron components, it utilizes a composite of high-strength steels, aluminum and composite materials. Harley 4 speed transmission differences map. This is done for fitment reasons. On the GM side of the proverbial aisle, the ten-speed made its debut in the Chevy Camaro ZL1, with both automakers planning to spread its influence even wider come 2018. Let me suggest a useful improvement for the 1941-73 transmission for use in any 45 that needs better high speed power. The transmission case itself is compatible with H-D secondary (rear) belt drive if the correct mainshaft, main drive gear, inner primary cover, starter shaft, starter housing, and related parts are used. WLDR "Special" Ratio.
With a wide ratio spread engineered with practicality in mind, the 10-speed transmission offers a modest 20% drop in RPM while shifting. Or use my trapdoor made for using a 4-speed kick cover... Unfortunately, this will require fabrication since 1 gear is part of the cluster gear, and the other has a shift clutch recess in its inner face. This new transmission added the extra gear that Harley riders had wanted for a long time, and the fifth gear increased the bike's top speed while allowing for low ratios in the lower gears. I'm unlearned about 4spd gearing, though I've been using a stock 4spd in my 76FLH bolted to my little 88" stroker for years now. The strength of the earlier, lever-type actuator is marginal for heavy clutch springs sometimes required in high-performance applications. An Ironhead transmission is easier to understand when broken down into categories: - Mainshaft and Gears.
What I would do (and did to my FXR): Get a late bagger box with integrated oil tank and run that to get rid of the fucking stupid (all of them) stock oil tank above the transmission and free all that space for maintenance. Had the shovel head electra glide and electra glide and evo electra glide the same problem with wanting to going into waves when it was pushed hard? It can also be found in the Lincoln Navigator. Is substituted for the original 18 tooth gear (35294-41) on the mainshaft, and the original 45 reverse gear (35284-41) is swapped from the mainshaft and welded or keyed to the countershaft in place of the existing reverse countershaft gear, the new pair is 17/19. This is the reduction or decay in the percentage drop in engine speed in the next gear (e. g. after shifting from 1st to 2nd). So with all of that in mind, let's get to know the transmission a little bit better, with 11 things you need to know about Ford and GM's 10-Speed Transmission. 1941-73 Standard Ratio RPM Loss on Shift. The existing wheel may require modification to accept the speedometer drive unit. Evan Gillespie grew up working in his family's hardware and home-improvement business and is an experienced gardener. Ratios less than 1:1 are overdriven like 6th gear which is. Or simply economic necessity: the parts were available. S&S trap doors are of the 1987-'99 style. Change in Packaging Footprint.
Shifter Fork Spacing. Compensator wear often leads to a knocking or ticking noise. Despite the increase in gearing, the 10-speed transmission gains a modest one-inch in length and four-pounds in weight. Shifting of the 10-speed transmission is facilitated by six clutches, engaging and disengaging in (dual-clutch) pairings. An overdrive would need its high gear to be a "normal" gear (the result of power transmitted across the shafts twice), but with a final number less than 1. They have a difficult time accepting that a motor oil can also protect the transmission and primary chaincase. The trap door assembly contains the mainshaft bearing, which is held in place by two retaining rings. There are two different countershafts for the four-speed Sportster transmission. However, the engine sprocket shaft must be of the type used in 1970-later big twin style engines. Baker 6 into 4 classic looking gearbox. In Harleys, the compensator acts as a shock absorber to prevent engine vibration from affecting the transmission. In 1980, the wish came true, and the five-speed gearbox would stay at the top of Harley's transmission line for over 25 years. There's nothing wrong with the stock five speed except it's not the later splined shaft five speed but the guts/door/later end cover do swap.
The OD6 offers more gear ratio choices than the DD6. Repair Stripped Threads In Aluminum. The new mainshaft gear must have its hub machined to match the shift clutch recess on the reverse gear (or the tooth row attached to the existing hub). The high gear internal ratio is the product of the high gear tooth counts. 9% RPM drop (5, 000 > 3, 555). No upgrade options, stuck with that clunky agricultural box in a more hassle to rebuild (vs. effortless swap without a case pull) case. Both transmission shafts should be checked for straightness. This reduces cost and results in fewer half-used bottles of oil lying around the garage. Frantisek Jiracek (Czech) 4-Speed. An Alternate 3 Speed Gear Set. The result is a reduction in size and/or weight for a number of key components including (but not limited to) the torque converter, which loses. Even if not using the e-start I'd bore the hole to fit the later Denso starters while I was there. Best Engine Assembly Lube.
Options if there is room and fabbing a new trans mount isn't a problem, and the longer drivetrain is sexually attractive because it looks MUCH more classic: Run a later Softail primary drive and transmission. Operating as overdrive gears, the last three gears serve to improve acceleration, fuel economy and towing performance.