another rearend question....

[challenger71]

I have the possibility of getting a suregrip (wheels spin opposite direction) out of a 73 roadrunner. Can I take that rearend and put it in my Challenger, or do I have to just take the 3rd member out and swap them? I too, do not know much about rearends (insert pun).

[Chryco Psycho]

the sure grip will rotate both tires in the same direction , if they are opposite it is not a sure grip
 the whole carrier can be swapped if both are 8 3/4 or the sure grip alone can be swapped into your gearset again if both are 8 3/4 " diffs   

[challenger71]

Thanks....I was reading the other forum about rearends and I was more confused after I was done. All I really needed to know was if it is a sure-grip, do the tires rotate the same direction or opposite.  And the answer is the same direction.

[challenger71]

Well I guess I am confused again. Here is a direct quote from the seller: "when I spin the drive shaft yoke both spin the same way but when I spin the axle the other one goes inthe opposite direction."

So would this be limted slip or open??

[hemiken]

Off topic, But thuoght you may apreciate your avatar made to a more useable size if you want to save it as.

[hemiken]

Your diff is an open center diff.    When turning a wheel the other wheel will turn in the same direction for a limited diff center.

[Chryco Psycho]

 
with any sure grip turning 1 wheel the other has to go the same rotation , if it goes opposite it is open

[challenger71]

Ok thank you. I now understand. My next question is, what is better or stronger, the clutch or cone style limited diff?

[Chryco Psycho]

Clutch is the better design

[moper]

I'll only add to the sure grip note on spinning the tires by hand "unless it's already destroyed...". If the grip is shot, it behaves like an open differential.

[hemiken]

Good point
But doesn't it feel notchy and drags a little when broken

[Chryco Psycho]

no , the cones type will bottom out & have virtually no resisitance left , however might as well treat it as a open as there is no way to repair a worn out cone type , you just throw them away

[hemiken]

I know guys who have done some kind of welding to build something up on cone style sure grips and they have worked.  Do not know how long for as i have not kept in touch for a long time. 

[Chryco Psycho]

you can machine .100 or more off the end of the cones & add shims to the springs to try to extend the life of the cone style , how well it works is up to debate I guess

[challenger71]

I have the possiblity of getting a cone style that is 20 miles from my house (no shipping) for just over $400. It has 3.91 gears and rotates good, and the teeth are perfect. It also has a 742 case. Which case is better, the 742 or the 489?