My rear tires spin opposite???

[Bridge]

I had my rear end up this weekend. Spinning the tires to listen for rubbing...wheel bearings again. Spinning one caused the other to rotate in the opposite direction. Is this normal? What causes it.

[Kukur]

That is your differential working perfectly.

[Bridge]

Great. I took the chance to ask a novice question. Thanks.

[FSJ Thing]

regardless of current age and experience, EVERY SINGLE ONE OF US has asked the exact same question at some point in our lives. Their is absolutely no reason to be bashful about it. Heck I just found out how a viscous coupler works last week!

[Bridge]

You guys are great. I'll ask another one under separate title then...

[tuck]

here's how you fix it. :D
open the diff cover, see all those spider gears? weld em together. Replace cover, add gear oil, and drive away chirping. :D

[Bridge]

Could I just use bondo or a quick-set concrete mix???

[Kukur]

Hey Wagothing...

How does a viscous coupler work? smile.gif

I definately have asked more 'novice' questions in my time. Luckily, I haven't found many arrogant people who held the answers secret.

[FSJ Thing]

It's kinda neat. Imagine a coffee can full of really thick oil. a shaft comes in on the top and a shaft comes in on the bottom. They are not physically connected. Each shaft has a big paddle wheel on it. Now when one shaft spins(input shaft from T case), the paddle wheel causes the really thick oil to spin inside the can as well. The spinning oil will then spin the other paddle wheel and it's shaft(front drive shaft). This is why you can run the NP229 in 4hi all the time without damaging anything, because the oil absorbs the difference in rotational speed. This is the basics of how a viscous coupler works, I found it on a site called "how stuff works"! smile.gif

[Stuka]

Bridge...no...you cant use concrete....

[La Wagoneer]

Use welding rod and lots of it. It'll stop that weird oppisite rotation of the tires.

[Bob Barry]

Originally posted by WagoThing:
It's kinda neat. Imagine a coffee can full of really thick oil. a shaft comes in on the top and a shaft comes in on the bottom. They are not physically connected. Each shaft has a big paddle wheel on it.It's even neater than that! I vividly remember the Popular Mechanics article on it back in '79 or '80 or so; there are a series of plates fitted in close-tolerance, with alternating ones attached to the input and output shafts, with a silicone fluid between them. Under normal conditions, the fluid allows the plates to spin independently. Above a certain pressure, however, the silicone fluid "grabs" the plates, kind of like a roller-ramp clutch, and locks them together.

Well, that's the theory, at least. The fluid apparently only does that a limited number of times before it gives up the ghost and doesn't grab anymore. And then you get to spend $350 on a new coupler.

Too bad we can't get a gallon of the original fluid, drain the old stuff out of the VC and put in new stuff (there is a drain-plug).

[Kukur]

Wagothing...

Cool description. So that the same theory behind how a torque convertor works, right?

[will e]

I have known about the opposite spinning thing for years. It is still really weird. Just last year I finally understood how it works well enough to understand why it does that!

[Navajo]

Originally posted by Bob Barry:
</font><blockquote>quote:</font><hr />Originally posted by WagoThing:
It's kinda neat. Imagine a coffee can full of really thick oil. a shaft comes in on the top and a shaft comes in on the bottom. They are not physically connected. Each shaft has a big paddle wheel on it.It's even neater than that! I vividly remember the Popular Mechanics article on it back in '79 or '80 or so; there are a series of plates fitted in close-tolerance, with alternating ones attached to the input and output shafts, with a silicone fluid between them. Under normal conditions, the fluid allows the plates to spin independently. Above a certain pressure, however, the silicone fluid "grabs" the plates, kind of like a roller-ramp clutch, and locks them together.

Well, that's the theory, at least. The fluid apparently only does that a limited number of times before it gives up the ghost and doesn't grab anymore. And then you get to spend $350 on a new coupler.

Too bad we can't get a gallon of the original fluid, drain the old stuff out of the VC and put in new stuff (there is a drain-plug).</font>[/QUOTE]'79! I wasn't even born!

[FSJ Thing]

HAHA! Yes! A torque converter works on the same principals but is more complex, it's actually two pumps in one housing full of tranny fluid (I just looked this up on the "how stuff works" page to see). But now I have a question that should interest everybody. Our torque converters don't have a lock up clutch in them, which means the engine is turning faster than the tranny does. this wastes gas :( . Does anybody make a "lock up" torque converter for our FSJs, and if so, does anybody run one now, and if so, has there been a noticable difference in gas milage?

[Chrome]

Originally posted by Bridge:
Could I just use bondo or a quick-set concrete mix???I hear Crazy glue does the trick.

[jeepjake]

"My rear tires spin opposite???"

Well...., no d**m wonder your truck gets such bad mileage, one wheel is trying to go backwards while the other is trying to go forwards! Hah!!!

[Kukur]

Good Question Wagothing, never heard of anyone having that... but it would be nice.

I always wondered why my CJ (with an I6 manual) felt like it had more torque of the start than my V8. Probably loosing a lot through the converter.

The V8 is more powerful and quicker... but doesn't have the pop like the I6. Guess that is why I have both! smile.gif

[Crazy_Jeepman]

one wheel is for going forward and the other is when you need to back up :D :D :D :D :D