Author Topic: M8 6 speed transmission.  (Read 2961 times)

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Offline jbroski

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Re: M8 6 speed transmission.
« Reply #25 on: April 09, 2019, 11:41:52 AM »
I can only comment about my bike, i'm running the stock trans with no issues. Ran it for 6400 miles before checking/changing fluid, went back with formula plus due to it working. Baker is a great company but grudge box is not for me

Offline rbabos

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Re: M8 6 speed transmission.
« Reply #26 on: April 09, 2019, 12:05:09 PM »
All the gears in the m8 tranny are the same as later twincams except for the countershaft.  Wouldn't be surprised if it interchanges.  Mainshaft is the same. 2nd/3rd gear countershaft are the same.
So, basically some are reaching the design limit of the gear box then?
Ron

Offline FSG

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Re: M8 6 speed transmission.
« Reply #27 on: April 09, 2019, 04:03:38 PM »

Offline Freedom1974

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Re: M8 6 speed transmission.
« Reply #28 on: April 16, 2019, 01:10:16 AM »
Great more things to worry about !

Offline joe_lyons

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Re: M8 6 speed transmission.
« Reply #29 on: April 16, 2019, 06:14:12 AM »
 I had a customer blow through 3rd gear on his 17. Built 114".
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Offline 08flstf

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Re: M8 6 speed transmission.
« Reply #30 on: April 29, 2019, 04:47:30 AM »
Well I think I just blew through my 3rd gear yesterday. Just got my 124 tuned the day before and took it out for my first test ride and apparently 3rd gear wasn't up to the task. Is there a more economic solution than going with the grudge box? I could do that if I have to but if there is another solution that might still be reliable I would like to explore other options. I always try to do all my own work when I can but have never gone into the transmission, nor do I have any of the specialty tools that may be required. Wondering if Baker or anyone else might make replacement gears or other parts that might be more robust vs replacing the whole gearset.

Offline Billy

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Re: M8 6 speed transmission.
« Reply #31 on: April 29, 2019, 01:07:54 PM »
Well I think I just blew through my 3rd gear yesterday. Just got my 124 tuned the day before and took it out for my first test ride and apparently 3rd gear wasn't up to the task. Is there a more economic solution than going with the grudge box? I could do that if I have to but if there is another solution that might still be reliable I would like to explore other options. I always try to do all my own work when I can but have never gone into the transmission, nor do I have any of the specialty tools that may be required. Wondering if Baker or anyone else might make replacement gears or other parts that might be more robust vs replacing the whole gearset.

I think your only options are to repair/replace yours with factory parts and expect the same durability, or the grudgebox. I've been waiting over a month for the grudgebox.
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Offline jbroski

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Re: M8 6 speed transmission.
« Reply #32 on: April 30, 2019, 06:14:26 AM »
Well I think I just blew through my 3rd gear yesterday. Just got my 124 tuned the day before and took it out for my first test ride and apparently 3rd gear wasn't up to the task. Is there a more economic solution than going with the grudge box? I could do that if I have to but if there is another solution that might still be reliable I would like to explore other options. I always try to do all my own work when I can but have never gone into the transmission, nor do I have any of the specialty tools that may be required. Wondering if Baker or anyone else might make replacement gears or other parts that might be more robust vs replacing the whole gearset.

I think your only options are to repair/replace yours with factory parts and expect the same durability, or the grudgebox. I've been waiting over a month for the grudgebox.

not claiming this is the fix or anything like that. I bought an oem transmission and sent it to liberty gears and had them enhance it, cryo treat, shot peen, polish. I believe these are the correct terms. I have not used it yet because I can't seem to break the stock one. we are running an oem 5 speed with this done and very good results so far

Offline 08flstf

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Re: M8 6 speed transmission.
« Reply #33 on: April 30, 2019, 07:57:31 AM »
not claiming this is the fix or anything like that. I bought an oem transmission and sent it to liberty gears and had them enhance it, cryo treat, shot peen, polish. I believe these are the correct terms. I have not used it yet because I can't seem to break the stock one. we are running an oem 5 speed with this done and very good results so far

Ok I'm confused. I'm riding a 2018 FLTRU M8 with the stock 6 speed. What type of transmission are you referring to? Don't know if Jims has any options for the M8 6 speeds or if anyone else does besides Baker. What would be an approximate cost for the work you referenced by Liberty?
« Last Edit: May 19, 2019, 09:27:26 AM by FSG »

Offline sfmichael

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Re: M8 6 speed transmission.
« Reply #34 on: April 30, 2019, 08:10:57 AM »
not claiming this is the fix or anything like that. I bought an oem transmission and sent it to liberty gears and had them enhance it, cryo treat, shot peen, polish. I believe these are the correct terms. I have not used it yet because I can't seem to break the stock one. we are running an oem 5 speed with this done and very good results so far

Ok I'm confused. I'm riding a 2018 FLTRU M8 with the stock 6 speed. What type of transmission are you referring to? Don't know if Jims has any options for the M8 6 speeds or if anyone else does besides Baker. What would be an approximate cost for the work you referenced by Liberty?


"OEM 5 speed" is likely a 1999-2006 stock 5 speed from a Twin Cam
« Last Edit: May 19, 2019, 09:29:59 AM by FSG »
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Offline 08flstf

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Re: M8 6 speed transmission.
« Reply #35 on: April 30, 2019, 08:24:19 AM »
Not trying to be smarta$$, but how does that relate to the M8 6 speed?

Offline sfmichael

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Re: M8 6 speed transmission.
« Reply #36 on: April 30, 2019, 08:35:54 AM »
Not trying to be smarta$$, but how does that relate to the M8 6 speed?

read the very first reply...  :smiled:

are you new here?
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Offline kd

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Re: M8 6 speed transmission.
« Reply #37 on: April 30, 2019, 08:43:52 AM »
Not trying to be smarta$$, but how does that relate to the M8 6 speed?


I think jbroski is simply stating that at this point in time there are not a lot of options out there he knows of "or things to compare".  He is using the 5 speed he had modified as an example and is putting big power through as something that has worked for him and caused him to have his 6 speed doctored because of that.  He also states at this point he can not report on how well the application(s) worked on the 6 speed because it hasn't been put into service yet.  It will be interesting to see how well it does work though because jbroski has proven to be pounding on his big power bikes (racing) harder than most.
KD

Offline jbroski

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Re: M8 6 speed transmission.
« Reply #38 on: April 30, 2019, 08:51:59 AM »
Not trying to be smarta$$, but how does that relate to the M8 6 speed?

nothing, i'm an idiot. go buy a grudge box
« Last Edit: May 19, 2019, 09:31:15 AM by FSG »

Offline 08flstf

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Re: M8 6 speed transmission.
« Reply #39 on: April 30, 2019, 09:06:07 AM »
Ok when I said "not trying to be a smarta$$" that's actually what I meant. I misread the part that I highlighted myself. I thought he meant bone stock 5 speed, didn't realize he had had this work done to it. Sorry if I'm not catching on fast enough, just trying to find some options.

Offline FSG

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Re: M8 6 speed transmission.
« Reply #40 on: April 30, 2019, 02:30:43 PM »
Well I think I just blew through my 3rd gear yesterday. Just got my 124 tuned the day before and took it out for my first test ride and apparently 3rd gear wasn't up to the task. Is there a more economic solution than going with the grudge box? I could do that if I have to but if there is another solution that might still be reliable I would like to explore other options. I always try to do all my own work when I can but have never gone into the transmission, nor do I have any of the specialty tools that may be required. Wondering if Baker or anyone else might make replacement gears or other parts that might be more robust vs replacing the whole gearset.

I think your only options are to repair/replace yours with factory parts and expect the same durability, or the grudgebox. I've been waiting over a month for the grudgebox.

not having had one apart I'm wondering if there's any realestate that can be stolen in there so as to fit a wider 3rd gear OR perhaps a different helical angle on 3rd so the gears are less likely to be driven sideways/apart 


Offline Durwood

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Re: M8 6 speed transmission.
« Reply #41 on: May 01, 2019, 04:52:57 AM »
not claiming this is the fix or anything like that. I bought an oem transmission and sent it to liberty gears and had them enhance it, cryo treat, shot peen, polish. I believe these are the correct terms. I have not used it yet because I can't seem to break the stock one. we are running an oem 5 speed with this done and very good results so far

Ok I'm confused. I'm riding a 2018 FLTRU M8 with the stock 6 speed. What type of transmission are you referring to? Don't know if Jims has any options for the M8 6 speeds or if anyone else does besides Baker. What would be an approximate cost for the work you referenced by Liberty?

The way I read it is they have a Twin Cam bike with the enhanced 5spd in that's hanging in there with the mods, and that he also had an M8 6spd modified but hasn't used it yet because he hasn't broken the stock one.

« Last Edit: May 19, 2019, 09:34:32 AM by FSG »

Offline jbroski

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Re: M8 6 speed transmission.
« Reply #42 on: May 19, 2019, 07:50:27 AM »
broke 3rd gear last night, now to see what the enhanced stock M8 trans will take

Offline NHBAGGER

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Re: M8 6 speed transmission.
« Reply #43 on: May 29, 2019, 06:04:34 AM »
Durwood, on one of the trike forums a guy with an 2018 lost 5th gear and they said 6th was ready to go.  Dealer said it was a defective part.

Offline Deye76

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Re: M8 6 speed transmission.
« Reply #44 on: May 29, 2019, 06:25:11 AM »
Are these failures all touring bikes, or softails also?
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Offline TMcGuire17

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Re: M8 6 speed transmission.
« Reply #45 on: May 29, 2019, 07:32:40 AM »
As I understand it the problem is with the hardening and the fact that third gear is cast into the main shaft. Its also my understanding that the grudge box isn't going to hold up for long either without back cut gears and possible retreating the 3rd gear and main shaft. My 128 blew third gear last night, has nothing to do with lubrication but everything with to much power for the stock set. I do have quite a few miles on it and trips down the strip but I don't think my warranty will cover it :-) :-( Right now Im inclined to replace with stock until there is a rock solid resolution to justify 3-5K$. Also a grudge box is going to take mnths to get!

Offline festus

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Re: M8 6 speed transmission.
« Reply #46 on: May 29, 2019, 08:31:01 PM »
For those who have had the trans 2nd or 3rd gear go out.
Check your comp Sliding cam very closely.
The bike i posted about in reply#7 had a new tranny installed by Harley dealer. All new.
275 miles later sliding cam broke, riding in 6th gear and just rolled it back.
I cant post a picture? but I have one.
Nothing is impossible if you don't have to do it yourself.

Offline harttoo

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Re: M8 6 speed transmission.
« Reply #47 on: May 30, 2019, 05:22:22 AM »
Got Mine back from the Dealer two weeks ago.Lasted 176 miles and first gear started to rattle.Back in the shop again.Wonder if I will get to use it this summer!