Mary Shelley published the novel ‘Frankenstein’ when she was 19 years old in 1818. Her brilliant story has withstood the test of time with many subsequent novels based on her work and many interesting movies. According to the inner circle of the BAKER opium den, the 1936-based Harley 4-speed kicker is the mechanical equivalent of Ms. Shelley’s literary masterpiece. So we got inspired by her and went back to the R&D lab and pieced together something for Evos and 1st generation Twin Cams. Effectively, we combined a 4-speed kicker with a BAKER 6-speed that fits into the 5-speed cases used from 1990-2006.
Made out of Billet 6061-T6 the Frankentranny bearing door is about 1 3/8″ wider then a stock 5-Speed . The door is wider in order to contain the 6th gear and all of the kicker gear components used in a 4-Speed application. The beehive spring is contained within the door riding on a ball mill track, the kicker gear stops are machined into the internal profile of the door for strength. In looking at the sectioned view you can see we didn’t leave any room to waste.
Our 6 Speed shift system with roller detent guarantees smooth shifts every time and our redundant neutral ensures that finding neutral is a easy chore. We mount a plunger detent on the left side pillow block and cut a plunger track into the shift drum itself. The plunger follows this track during operation (shifting) and when shifting into neutral pops into a pocket. This system lets you feel that you’re shifting into neutral. No more guessing. Shift drum features more aggressive timing on the fork groove profiles and is case hardened to 58 Rockwell for wear resistance and crisp shifts. We built our reputation on smooth shifting 6-speed transmissions; our drum designs benefit from the engineering lessons learned.
The Frankentranny utilizes the OD6 gearset. Made out of 8620 steel, gears are shaper cut before heat treat then precision ground with diamond coated tooling after heat treat (58-62 Rockwell ‘C’). This extra steps ensures not only a quieter gear pair, but enables much tighter backlash control. This tighter control on the gears yield a silent operation.
The Frankentranny comes in a standard ‘2.94’, optional ‘3.24’ or R-Ratio ‘2.82’ configuration. A way to physically tell which ratio you have is pretty common knowledge here at BAKER, but if you would like to know look at the 1st gear pair on the gearset. Our standard 2.94 1st gear will not have a notch on the 1st countershaft gear, our (stock) 3.24 1st gear will have a single notch around the center of the 1st countershaft gear and our 2.82 (R-Ratio) 1st gear will have 2 notches around the 1st gear countershaft. Use the image on the far right for reference. This is very important to know if you need any replacement parts or components.
Our investment cast shift forks are made out of 4140 then dipped in a hard chrome plate bath for wear resistance, also designed with oil reliefs to ensure proper lubrication and wear resistance on fork blades and shift dogs.
Available No Cost Options
The Frankentranny comes in a standard, optional or R-Ratio configurations
|1st Gear||2.94 / Optional 3.24|
Builder’s Kit Part Numbers
All Part Numbers Listed Are Standard 2.94 Gear Ratios
|New PN||Old PN||Description||Fitment|
|FT-106L||FT106L||Frankentranny Builder’s Kit||1990-97 Big Twin – All Models|
|FT-106SL||FT106SL||Frankentranny Builder’s Kit||1998-99 Softail1998-00 FLT-FLH & Dyna|
|FT-106P||FT106P||Frankentranny Builder’s Kit||2001-05 Dyna2001-06 FLT-FLH2000-06 Softail|
Builder Kit Notes
We started providing install DVD’s with every builder’s kit starting in October 2012. At approximately 3:25 of the OD6 portion of the DVD, Bert talks about modifying the shifter pawl. This modification is related to the stock shifter pawl lever assembly (H-D PN 34972-02B) and the use of BAKER 5-6QSN & 5-6QLN shift drums. We now provide a shift drum BAKER PN 124-OD6, which supercedes the 5-6QSN, 5-6QLN Shift, 5-6QEN, 5-6QFN & 5-6QGN shift drums, that requires no shimming and works with BAKER shifter pawl 555-56C or 555-56LD (depending on year or motorcycle) which we include in kits and on all BAKER complete builder’s kits. We do not sell any kits, shift drums or transmissions that require any shifter pawl with BAKER marked on it, that needs to be ground or modified anyway. Any questions, please call us at 877-640-2004.
Complete Build Part Numbers
All Part Numbers Listed Are Standard 2.94 Gear Ratios
|New PN||Old PN||Description||Fitment|
|FT-701||K701*||Frankentranny Complete w/Standard Cover||1990-99 Softail|
|FT-701-FF||K701*-FF||Frankentranny Complete w/FF Cover||1990-99 Softail|
Complete Build Notes
All complete Frankentranny’s come with our Klassic Kicker Gears standard. Made out of 1018 HR Steel, tumble finished to around a 20 micro and heat treated to 50-55 RC; these gears roll smooth as glass.
A Speedometer recalibration unit is required for electric speed sensor applications; PN 95E-56B. The sensor is going to be plugged into the bearing door and NOT the case. Complete builds will not have a speedo sensor hole on the case, but if you are doing a builder’s kit the case will hole will have to be plugged off. A sensor plug comes in the kit which is usually installed on the bearing door for safe keeping.
Ignition Retrofit Alternatives
Starting in 1999 with the first Twin Cam engines, Harley started using a flywheel-based trigger for the ignition. This style ignition requires the flywheel (aka crankshaft) to turn over 3 or 4 times for it to ‘find itself’ before it starts sparking. 3 or 4 rotations of the flywheel may not sound like much while you’re taking a shit right now and reading this, but it’s almost humanly impossible. Cam-based ignitions spark spark at less than one flywheel revolution and it lights off the first time it hits TDC.
If you install one of our Frankentranny kits on a Twin Cam you must covert the ignition to a cam-based unit like the ones shown below. Also EFI models will have to be converted to a carb setup.
Any information regarding the ignition units please visit the company websites listed below by clicking on the link.
|5011||Gates Performance Kit||Gates Performance Website|
|T-5||Morris Magneto Kit||Morris Magneto Website|
|3757||Vulcan Cover Kit – 1||Vulcan Engineering Website|
|3886||Vulcan Cover Kit – 2||Vulcan Engineering Website|
|4365||Vulcan Cover Kit – 3||Vulcan Engineering Website|
Recommended Fluid / Level
Picking the right transmission fluid ensures the life and durability of your transmission, that’s why BAKER recommends a fully synthetic GL-5 rated gear weight oil of 75W-140. If a GL-5 rated gear lube is not available, these commonly carried viscosities (weights) will work 75W-90, 75W-140 and 85W-140. BAKER does not recommend the use of Syn3 (20W-50). For Bert’s article on ‘Oil & Spiders’ Click Here
Frankentranny installation instructions with exploded views: Click Here
We started providing install DVD’s with every builder’s kit starting in October 2012. At approximately 3:25 of the OD6 portion of the DVD, Bert talks about modifying the shifter pawl. This modification is related to the stock shifter pawl lever assembly (H-D PN 34972-02B) and the use of BAKER 5-6QSN & 5-6QLN shift drums. We now provide a shift drum BAKER PN 124-0D6, which supercedes the 5-6QSN, 5-6QLN Shift, 5-6QEN, 5-6QFN & 5-6QGN shift drums, that requires no shimming and works with BAKER shifter pawl 555-56C or 555-56L (depending on year or motorcycle) which we include in kits and on all BAKER complete builder’s kits. We do not sell any kits, shift drums or transmissions that require any shifter pawl with BAKER marked on it, that needs to be ground or modified anyway. Any questions, please call us at 877-640-2004.
1st Gear Design Change
1st Gear Change Addendum-March 2012: Click Here
These example finishes are intended to show the exterior treatments of cases, top covers and doors.
TERM AND CONDITIONS
LIMITED WARRANTY POLICY
BAKER™ transmission assemblies, transmission kits, primaries, and oil pans are guaranteed to the original purchaser to be free of manufacturing defects in materials and workmanship for a period of 5 years from the date of purchase or up to 50,000 miles. BAKER™ clutches, kicker cover kits, belt drives, F6F kit, reverse systems, covers and accessories are guaranteed to the original purchaser to be free of manufacturing defects in materials and workmanship for a period of 2 years from the date of purchase or up to 24,000 miles - whichever occurs first. If the product is found by BAKER™ to be defective, such products will, at the option of BAKER™, be replaced or repaired at cost to BAKER™.
In the event warranty service is required, the original purchaser must call or write BAKER™ immediately with a description of the problem. If it is deemed necessary for BAKER™ to make an evaluation to determine whether the transmission assembly or transmission kit or accessory is defective, the entire transmission assembly, whether originally purchased as an assembly or kit, must be properly packaged and returned prepaid to BAKER™ with a copy of the original invoice of purchase. If after an evaluation has been made by BAKER™ and a defect in materials and/or workmanship is found, BAKER™ will, at BAKER™ option, repair or replace the defective part of the assembly.
WARRANTIES FOR "INSIDER SPECIAL" PRODUCTS
Due to the uniqueness, low price and assembly outside of typical production process of products indicated as Insider Special products, purchasing these Insider Special products include a warranty so to guarantee the original purchaser to be free of manufacturing defects in materials and workmanship for a period of 1 year from the date of purchase or up to 12,000 miles. We have provided extended options for you to purchase below.
RETURNS AND EXCHANGES
Any merchandise returned for any reason (exchange, credit or modification) must be accompanied by a Return Goods Authorization (RGA) number or it will be refused. Call BAKER™ to obtain this number prior to returning goods for any reason. There is a 15% re-stocking fee for all returned items. BAKER™ is not liable for any shipping charges.
ADDITIONAL WARRANTY PROVISIONS
NOTE: Limited warranty does not cover labor or other costs or expenses incidental to the repair and or replacement of BAKER™ products.
This warranty does not apply if one or more of the following situations is judged by BAKER™ to be relevant: BAKER™ OEM transmissions; (these are subject to the OEM manufactures warranty only), Improper installation, accident, modification (including but not limited to use of unauthorized parts, transmission oils or lubricants), racing, high performance application, mishandling, misapplication, neglect (including but not limited to improper maintenance), or improper repair.
BAKER™ shall not be liable for any consequential or incidental damages arising out of or in connection with a BAKER™ transmission assembly, transmission kit, component or part. Consequential damages shall include without limitation, loss of use, income or profit, or losses sustained as the result of injury (including death) to any person or loss of or damage to property.
BAKER™ transmissions, transmission kits and accessories are designed exclusively for use in American V-Twin motorcycles. BAKER™ shall have no warranty or liability obligation if BAKER™ parts are used in any other application.
If it is determined that a BAKER™ product has been disassembled during the warranty period for any reason, this limited warranty will no longer apply unless you were instructed to do so by a BAKER Drivetrain technician for diagnostic purposes.
The words H-D®, Softail®, FXR®, Dyna®, FLT®, FLH®, Sportster®, and Buell® are registered trademarks and are for reference only.