[J-dawg]

Well, so much for that theory ...

 

[RodeoRed]

do a burn out in the rain and see if both tires spin

does that mean you have Limited slip?

cause both tires spn on mine. hmmmm

 

[nitroman]

only one tire ought to spin....right

 

[BigSwede]

datrupr, is yours an automatic or a manual? I think TOD was an option for manual-tranny equipped 98-99 4x4 Troopers, and all auto 4x4s got TOD. Huh, maybe that merits a rear window sticker ... "Got TOD?"

I know in 99 that manual Troopers, of which there were a few, had a regular transfer case. All of the automatics had the TOD transfer case.

I still have the brochure from my old 99 Trooper...

 

[timrkopi]

A open diff will only spin one tire in the rain.

BUT, if your truck is exactally balaced right and left and you have
a lot of break pressure and your breaks are applying pressure
very evenly you can get both tires to spin.

I have noticed that the Dana 44 LSD applies a lot of force to the tire
that has most traction. I have noticed this during turning via tire noise.

During low to medium speed Quarter shots the truck will easily fish
tail scaring the ship out of the passanger. I think this is a better
test to see if your LSD is working. You can use rain, mud, or a dusty
road. In snow it is a mixed blessing but with the 4WD on it helps
prevent the truck fish tailing.

Quater shot = hitting the gas when making a 90 degree turn.

With the extra pressure on the tire in which the turn is leaning into there
is no chance that an open diff will spin both tires. Thus your turn will
stay on track and not fish tail.

 

[ebacherville]

Just so you know i was bumming whan i looked at my plate in the engine bay to see no g80 on its options .. But just for kicks i decided to check it and see if it was truly a standard diff.. placed one rear wheel on tar and one on the gravel sholder driver side on the tar.. opened the door and did a break stance .. sure enough the wheel on the tar was spinning.. LIMITED SLIP DIFF YES !!!

SO the moral of the story is the plate may not say it , just test it ,, youll know pretty easy if you have one..

My truck is a 1992 trooper just so you know, wikipedia says all 1992 and up troopers have limited slip diffs.. dont know if thats right or not ..

Mine did ... ME HAPPY

Jason

 

[trooperbc]

...
SO the moral of the story is the plate may not say it , just test it ,, youll know pretty easy if you have one..

My truck is a 1992 trooper just so you know, wikipedia says all 1992 and up troopers have limited slip diffs.. dont know if thats right or not ..

Mine did ... ME HAPPY

Jason

jason, you want to make absolutely sure when you go to add or change out the dif gear oil because they are different for open and ls differentals.
here's another link to a wikipedia page talking about difs
http://en.wikipedia.org/wiki/Limited_Slip_Differential
and a quote from same with my bold face and underline added

The main advantage of a limited slip differential is found by considering the case of a standard (or "open") differential where one wheel has no contact with the ground at all. In such a case, the contacting wheel will remain stationary, and the non-contacting wheel will rotate at twice its intended velocity â€" the torque transmitted will be zero and the vehicle will remain stationary. In everyday use on typical roads, such a situation is very unlikely, and so a normal differential suffices. For more demanding use however, such as driving off-road, or for high performance vehicles, such a state of affairs is undesirable, and the LSD can be employed to deal with it. By limiting the velocity difference between a pair of driven wheels, useful torque can be transmitted as long as there is some friction available on at least one of the wheels.

you might want to consider one of those tests in one or two of the posts above that have the car jacked up and check it that way.

btw, for you and others, that wikipedia article has a good link to a how it works site with some good explanations of how a dif works complete with animation.

btw2, [/url]

 

[2000Trooper]

sure enough the wheel on the tar was spinning.. LIMITED SLIP DIFF YES !!!

What about the wheel on the gravel, was that one spinning?

 

[Gizmo42]

Thats not a very good way to test it. I agree with trooperbc, jack it up and test it. Not very difficult. Just lift both wheels off the ground and spin one. If the other one spins the same direction then you know you have LSD.

 

[ebacherville]

Yes my gravel/tar test was with drivers rear on the tar and passangers rear on the gravel, poth tires spun the dirt and the tar side , I could see the tar side spinning and i could hear the dirt flying on the pass side.. there was a hole left over when i stopped.. My test is fairly fool proof and very easy.. On an non limited slip the tire on the tar will not spin as the other tire is easier to turn fopr the motor so it will only turn.. its like wter it will always flow downhill not up the power on a non limited diff will always to to the place of less resistance.. and spin the wheel with no traction. Non limited slip 4x4 is how you can have both left wheels on ice and the other two on tar and the truck won't move!! technically 2 wheel drive..

Im positive I have the limited slip diff.. there is no way in heck that tire on the tar road would have spun like that, you can tell limited slip when you do a break stance the tires kind of "pulsate" when the two sides are fighting for traction..and the limited slip is working... hard to explain, the gravel and tar test is all I need.

If I change oil in the diff I will pull the cover and look visually to make sure it is one but Im surte it is already..

Jason

 

[2000Trooper]

If I change oil in the diff I will pull the cover and look visually to make sure it is one but Im surte it is already..

Being that you have a Trooper, you don’t have a cover on your axle. You will have to pull the axles out and remove the third member to see what’s inside.

Or, I guess you could use a small light to look into the diff via the oil fill hole. Not sure you will be able to see much.

 

[ebacherville]

No dif cover!.. How the heck do you change the gears?

I dont have access to look right now .. Well if i decide to change fluid, Ill jack it up and do the spin test.. Ims still positive that its limited slip.

Jason

 

[2000Trooper]

Here is a picture of the rear 12 bolt (modified 1998-2002) differential, yours being a 12 bolt, should look the same just slightly smaller:

Here is a picture of it broken down:

So to look that the inside you would have to pull out the axle shafts (1) {also the drive shaft} , remove the bolts (2) and pull out the third member (3).

Hope that clarifies it a little bit

 

[Gizmo42]

No dif cover!.. How the heck do you change the gears?

You remove the 3rd member which is the part that bolts to the drive shaft side of the diff. Pretty common for japanese axles.

At least you dont have to remove a cover to change your oil, you have a drain plug :roll: :lol:

 

[Gary]

EDIT: my original post was of little value here! Would have deleted it if I had found the option.
I now have a LSD from the wrecking yard. 'Hope to have it installed soon.

Gary

 

[Ed92Rodeo]

My '92 Rodeo has no G80 code. I know from experience if one rear wheel gets lifted off in 2WD, it's "stuck." One wheel of each axle off the ground, crossed up, it's just as stuck in 4WD. Same as when one tire's on ice, the other on dry ground. Jacked up, tires rotate opposite. Open diffs.

Since there's very little droop to keep all tires on the ground in stock running trim, it's basically worthless as a serious trail vehicle. I take it off road, but drive it pretty conservatively. I always back out of situations that appear beyond its capabilities.

Except for that one time out fossil-hunting where I took that rutted-out section of trail and highcentered it. I had to jack up all four corners, some of them several times. Then dig out the high parts, comprised mostly of heavy-rooted prairie sod and shovel it under the tires, along with a few discarded old fence posts to get all four tires making good contact. Only took a couple three hours, I really try to avoid those spots now. Worst part was that a perfectly navigable bypass was right next to me!

-Ed

 

[lowzone]

Here is a picture of the rear 12 bolt (modified 1998-2002) differential, yours being a 12 bolt, should look the same just slightly smaller:

Here is a picture of it broken down:

So to look that the inside you would have to pull out the axle shafts (1) {also the drive shaft} , remove the bolts (2) and pull out the third member (3).

Hope that clarifies it a little bit

i'm lost here......are we talking about a dana 44 rear or a Isuzu 12 bolt??? thought the isuzu 12 bolt was discontinued on the 94 Amigos and 95 pups. Thought everything from there on out was either a dana 44 or Gm 10 bolt (hombre)...if its a Dana 44 rear, it has a diff cover, but no drain plug.... I blew up a Dana 44 ONCE from some idiot pulling an illegal u trun infront of me and my stupidity of down shifting from 3rd to 1st and locking the rear up, the 31s ended up breaking a tooth off the spider gear and causing a ship load of mess inside, should have just hit the idiot, and pointed to the NO U TURN sign that i would have pushed him into..... (big problem at this road for illegal u turns, for this reason) hee hee....ok im done

 

[Gizmo42]

Only the rodeo and amigo had D44 rear axle. Troopers had Isuzu 10 bolt (early) then upgraded to Isuzu 12 bolt. I dont know if the rodeo/amigo ever had an isuzu rear axle. All front axles are isuzu though, 8 bolt early, then upgraded to 10 bolt. I dont know what years different models changed to different axles. This is all just info I've absorbed through the forums. I'm sure someone more knowlegable will correct me or fillin blanks.

 

[2000Trooper]

i'm lost here......are we talking about a dana 44 rear or a Isuzu 12 bolt???

The initial post was for a 1992 Trooper... so we are talking about the Isuzu 12 Bolt. The only picture I had available to show was the modified 12-bolt that came on the 98+ Troopers.