Blown Final Drive

[one2dmax]

If the shaft is too long the back of the block gets cracked.

 

[[email protected]]

If the shaft is too long the back of the block gets cracked.

What would be a good way to check to see if the driveshaft is too long? I'm thinking, if you were to remove the rear wheel and shocks and just articulate the swingarm up/down you should be able to tell if it is bottoming out. Think that would work?

 

[one2dmax]

I've never seen a stock shaft that was a problem.

 

[[email protected]]

Understood on stock, but what about extended swingarm and +3 sportmax shaft or jedi extension.

What would be a good way to check to see if the driveshaft ended up a touch too long?

 

[one2dmax]

Maybe measure from the end to end with shaft only. Then add the extension and remeasure.

 

[Miles Long]

Isn't this just simply a matter of collecting measurements, Mike?
With your extended swingarm (sans gearcase) in place, and the extended driveshaft seated in the splines of the u-joint, there is now a set distance between the outboard end of the shaft and the mating flange of the swingarm.
And the distance between the mating flange of the gearcase and the total depth of the gear coupling can be measured, before installation.
Perhaps a quicker way to check - does your setup still use the compression spring? The total amount of compression could be measured on a bench, then compared to the stand-off measurement when the mating flanges are brought together, before tightening the gearcase nuts. Of course this measurement should be less. The difference in the measurements should be the amount of shaft axial movement allowed, with everything tight.
Does this make sense, Mr. Morley??

 

[wildweasel_pt]

This is exactly the reason why i have a splined sleeved setup on my custom swingarm.

 

[redneksoldier]

I've never seen a stock shaft that was a problem.

I was just trying to find something to balme it on other than my own abuse. It can't be my fault, right? Wait, don't answer that!:ummm:

 

[slowrider]

Hello- Pulled my final drive unit out of swing arm and am ready to re-install. Do you know an easy way to put the drive shaft back in to the ujoint. I can't figure out how to align and stab it back in.

 

[one2dmax]

Easiest way is to unhook the shocks and let the swingarm hang down. First thing is to remove the driveshaft from the differential so you are working with just that part.