small leak at primary..what tools to buy
Wait maybe I'm not understanding whats going on. Does the bearing race ride where the Inner primary bearing goes? the bearing doesn't ride shaft it rides on the race?
Rance sent me a Drag specialties bearing 1120-0217 and says it will work on the 08 ....but the part listing says different or it's just never been updated
I have a mixed batch of parts sitting here. What I have, that I know is correct at this time is the 08 chrome inner primary cover, it has the correct bearing and seal installed in it already.
I'm not sure if the gear set that Rance sent me is correct ether. The drag specialties bearing slips on on it. I have a bearing race and it looks like its a close fit. It fits the bearing in my chrome inner and looks like it might have to be pressed on the output shaft of the gear set Rance sent me but I'm not sure if it is the correct race or gear set.
The bearing race I have is that Rance sent me is from Eastern M/C Parts part# 34091-85 says its big twin 1985 to present also says **5th Gear** ** 5 speed**
All would be correct I think if the output shaft didn't change size in 08, Are you sure?
Last edited by GaugeMods; Apr 8, 2013 at 10:41 PM.
Wait maybe I'm not understanding whats going on. Does the bearing race ride where the Inner primary bearing goes? the bearing doesn't ride shaft it rides on the race?
Rance sent me a Drag specialties bearing 1120-0217 and says it will work on the 08 ....but the part listing says different or it's just never been updated
I have a mixed batch of parts sitting here. What I have, that I know is correct at this time is the 08 chrome inner primary cover, it has the correct bearing and seal installed in it already.
I'm not sure if the gear set that Rance sent me is correct ether. The drag specialties bearing slips on on it. I have a bearing race and it looks like its a close fit. It fits the bearing in my chrome inner and looks like it might have to be pressed on the output shaft of the gear set Rance sent me but I'm not sure if it is the correct race or gear set.
The bearing race I have is that Rance sent me is from Eastern M/C Parts part# 34091-85 says its big twin 1985 to present also says **5th Gear** ** 5 speed**
All would be correct I think if the output shaft didn't change size in 08, Are you sure?
Now, what I am sure of:
1. The IPB and seal ride on the IPB race, not the shaft.
2. I have no idea what the Drag Specialties IPB will fit.
3. If the Drag Specialties IPB will "slip" on the main shaft; it is the wrong race. The IPB race is an interference fit to the main shaft and will require 35-40 ft.lb. to press the race n to the main shaft.
4. The main shaft of the Dyna gearsets is a different diameter than touring models. You need to find out exactly what gear set you have so you can match it up with the appropriate IPB race.
5. The MoCo was experimenting a few years back with different ID dimensions for the IPBs to solve the problem of the race "walking" in on some early models. The seals are not affected and the different IDs will install, some just might require a bit more torque to press on.
6. The later IPB bosses have a hole on the back (inside) of the bearing boss to allow primary oil to lubricate the IPB. That hole can be blocked by the snap ring; so be sure to check your inner primary and if the hole is there, make sure that the snap ring is oriented so the oil can pass through to the bearing boss.
7. I would not install a IPB race for a five speed on a six speed main shaft.
Last edited by djl; Apr 9, 2013 at 12:37 PM.
This tranny is like a box of chocolates as I'm not sure what I'm going to get until I get it opened up.
After messing with that gears set the other night my best guess would be a bent shift fork not moving the slider enough, but who knows.
I should have mentioned the Drag Specialties bearing is a one piece bearing that eliminates the bearing race. I'm not going to pull the bearing out of the Chrome Inner, until I check the Drag specialties one piece with the stock inner primary and the input shaft of my gear set, that way I don't mess up what I know will work in the chrome inner primary.
If I use the bearing that is installed in the chrome inner from the factory I will check alignment, thx DJL

or by cutting a notch in the bearing (very carefully to as not to knick the main shaft) with a Dremel tool and splitting the race. The race is very brittle and a sharp blow to a chisel inserted into the notch will split the bearing. Best to support the main shaft before striking it with a hammer.

You will not be able to install the IPB by heating it with heat and cold as has been suggested; you need the proper puller. The puller shown above is also the install tool. The race is installed by using a spacer and to push the race on using the main shaft nut.
Like I said before, it's not rocket science but is a labor intensive job and not one you will want to repeat anytime soon, so best to replace all the seals behind the inner primary while you have it open. Having said that, once you have done the job several times, it isn't a big deal. Like everything else, the devil is in the details. Pay attention when you are disassembling and read and follow the SM.

or by cutting a notch in the bearing (very carefully to as not to knick the main shaft) with a Dremel tool and splitting the race. The race is very brittle and a sharp blow to a chisel inserted into the notch will split the bearing. Best to support the main shaft before striking it with a hammer.

You will not be able to install the IPB by heating it with heat and cold as has been suggested; you need the proper puller. The puller shown above is also the install tool. The race is installed by using a spacer and to push the race on using the main shaft nut.
Like I said before, it's not rocket science but is a labor intensive job and not one you will want to repeat anytime soon, so best to replace all the seals behind the inner primary while you have it open. Having said that, once you have done the job several times, it isn't a big deal. Like everything else, the devil is in the details. Pay attention when you are disassembling and read and follow the SM.








