Axle questions

[TheMaddTitan13]

My 89 mj (i belive) has the cad dana 30(upgraded to cromely shafts and spartan locker, deleated cad)  and I have a dana 35 in the rear. 

1st question, is the cad dana 30 wider than the dana 35? Ive been trying to center my front axle and it seems like my front end is about 2 in wider than the rear. ( also my coil rubs on driver side even after centering, any tips to avoid that? Its the trackbar mount that it rubs on.)

 

2nd question, when I lift my rear and rotate one wheel, the other wheel rotates backwards. That indicates open differential, but everytime I spin tires both rear tires spin, on asphalt and offroad, is it possible it has the limited slip in the rear? Did comanche even offer lsd? (I havent poped the rear face off yet)

[Pete M]

the axles are the same width, but the MJ has a wide butt and the bed is wider than the body at the front.  

 

got any pics of where the tire is rubbing?  is it touching during flexing?  turning?

 

yes, the dana 35 could be had with a limited slip.  anyone know if it's possible that a lunchbox locker would do that? 

[TheMaddTitan13]

14 minutes ago, Pete M said:

the axles are the same width, but the MJ has a wide butt and the bed is wider than the body at the front.  

 

got any pics of where the tire is rubbing?  is it touching during flexing?  turning?

 

yes, the dana 35 could be had with a limited slip.  anyone know if it's possible that a lunchbox locker would do that? 

The tire rub the control arm just alittle when fully flexed and turning. The spring rub is what concerns me. 

[derf]

18 minutes ago, Pete M said:

the axles are the same width, but the MJ has a wide butt and the bed is wider than the body at the front.  

 

got any pics of where the tire is rubbing?  is it touching during flexing?  turning?

 

yes, the dana 35 could be had with a limited slip.  anyone know if it's possible that a lunchbox locker would do that? 

A lunchbox locker wouldn't do that unless it's broken.  And there would be other problems that were obvious.

 

A completely worn out limited slip (like the factory one in my CJ) acts like an open diff.  It really depends on how marginal it is.  I haven't tested mine to see if it actually limits slip at all but I doubt it.  If it's like mine where I can turn the brake drums by hand, it's about 100% shot.  If you need the tires on to get enough leverage and it still takes some effort, it may still be hanging on a little.  Enough to still limit a little bit of slip.

[TheMaddTitan13]

8 minutes ago, derf said:

A lunchbox locker wouldn't do that unless it's broken.  And there would be other problems that were obvious.

 

A completely worn out limited slip (like the factory one in my CJ) acts like an open diff.  It really depends on how marginal it is.  I haven't tested mine to see if it actually limits slip at all but I doubt it.  If it's like mine where I can turn the brake drums by hand, it's about 100% shot.  If you need the tires on to get enough leverage and it still takes some effort, it may still be hanging on a little.  Enough to still limit a little bit of slip.

Sounds like i just need to take the rear cover off. 

It hasent leaked a drip, so ive just let it ride so far. 

 

[derf]

11 minutes ago, TheMaddTitan13 said:

Sounds like i just need to take the rear cover off. 

It hasent leaked a drip, so ive just let it ride so far. 

 

Doesn't hurt for it to stay sealed.  Though a diff fluid change is likely a good idea.  You could start by pulling the fill plug and checking the fluid level.  Also look to see if it's too dark or milky.  Or filled with what looks like glitter.

 

A worn out limited slip just turns into an open differential.  So it's not critical that you must fix it when it wears out.  Unless you really want the limited slip to work.

 

You can get a clutch rebuild kit if you want.  It can take some effort to get it installed with the new clutch discs.  And whatever you do, be careful with the shims when you pull out the differential case.  Don't mix them up.  They're on the outside of the bearings.

[Pete M]

10 hours ago, TheMaddTitan13 said:

The tire rub the control arm just alittle when fully flexed and turning. The spring rub is what concerns me. 

 

 

what's the caster set to?  was that photo taken when flexing?  if so, can you snap a pic of that area when the truck is static?