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Transmission question for Larry

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Transmission question for Larry Empty Transmission question for Larry

Post  coopsta on Wed May 07, 2014 11:19 pm

Hey Larry when you are rebuilding a 4 speed you were saying you check the main drive gear endplay then if you want to reduce the endplay your trim that gear in the lathe. So you are taking meat off the main drive gear where the spacer hits the shoulder on the drive gear correct? What do you like to set the endplay at around .005"-.010"?
In the process of redoing a late 4speed I picked up at that swap the other weekend and I am going thru everything to rebuild a spare for my glide.
How tight do you dare go on the MDG bushing fitment to mainshaft. I been hearing some guys will try and get that down to .001" fit but that seems crazy tight? I am gonna get the hone set up to do the bushings in this tranny.

Thanks
Coop
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Transmission question for Larry Empty Re: Transmission question for Larry

Post  h.d.ryder on Thu May 08, 2014 4:43 pm

.001" is perfect for a running fit. Saddlebagrail sets his at .0007" , that`s 3/10 less than a thou.
If your trans is a later turbin top? the M.D.G. end-play spec. is .010" -.025" . My guess is , you will be in that range. I only peel down the shoulder as a last resort. If you`re not in that range, first try to see if the case is worn on inside and see if the thrust face on gear is worn.
You probably know this, but check your M.D.G. end play after the new brgs. are installed and after new M.D.G. bushing is sized to fit mainshaft , then install M.D.G. on shaft in case (without other gears) and torque on an old sprocket and nut.
Take your reading with a dial gage on side of gear, this will give you an accurate M.D.G. end-play reading.
Hope this helps.

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Transmission question for Larry Empty Damn good info

Post  coopsta on Thu May 08, 2014 5:21 pm

That method of checking is a really good idea Larry I will certainly go that route, usually I assemble the whole kit and kabootle then do the checking but that would seem a waste of time, your method makes more sense. As for what Ray is doing at .0007" fit for MDG and mainshaft, god damn that seems almost crazy tight.

I can't believe that bushing doesn't weld itself to the shaft as the tranny warms up. My last one I put together was an andrews MDG and a brand new mainshaft and it was probably very close to .001" and when all parts where clean it was a very good fit but just adding a few drops of assembly lube to the parts and it actually seemed to tighten things up, I ran it like that but was shivering thinking that bushing would pile up the first few times I put miles on the tranny.

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Post  zaac on Thu May 08, 2014 7:16 pm

Ray told me he only uses syn oil with .0007
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Post  coopsta on Thu May 08, 2014 7:36 pm

ya jack that makes sense with so little tolerance
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Post  h.d.ryder on Thu May 08, 2014 8:31 pm

Hey Coop,
Maybe you can do a complete trans. build thread with lots of photos. that would be good to see.

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Post  sunnydog on Thu May 08, 2014 8:51 pm

See Carlos I told ya the same thing! Now ya gotta do a build thread dammit!
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Transmission question for Larry Empty build thread lol

Post  coopsta on Thu May 08, 2014 9:13 pm

Ya I can put together a porn production I guess…lol….hillbilly 4 speed rebuild somolia style!!!
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Post  Dennman on Thu May 08, 2014 10:40 pm

coopsta wrote:  Ya I can put together a porn production I guess…lol….hillbilly 4 speed rebuild somolia style!!!

That would be great Carlo.
I've got 2 extra trannies on the shelf.
A cowpie spare and a 3-speed reverse for a tentative trike redo.Both for the Weerier.I want to go through them before I get around to installing them.
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Post  sunnydog on Fri May 09, 2014 11:44 am

I'd like instructional vid but please hold off on the porn  No 
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