Help with Drivetrain

J

jamesT4R

New member
Hey all, been a long time since i been on here, just got back from the wonderful vacation spot known as Afghanistan.

Long story short, earlier this week my runner (1990 SR5, 4WD, 22re out of a 1995) started making a rattling/clanking noise. Went away whenever I pushed in the clutch, gets louder under load. I figured it was either the clutch plate or throwout bearing, so i went ahead and replaced the whole clutch system (clutch plate, pressure plate, throwout bearing, pilot bearing, and slave cylinder for good measure).

Bled the clutch this mornin, and hit the road. much to my dismay its doin the same thing, but today i noticed that the speed of rattle is dependent on my speed, not my RPM's (i.e. 60mph rattles faster than 30mph)

I was thinkin it might be my rear end, cause the guy i bought it from thought it'd be a good idea to weld the gears, but I haven't gotten a chance to break into it yet. any other thoughts or suggestions for what to check before I drop the tranny again?

Thanks in advance
 
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Roger that. gonna crawl back under it tomorrow and start checkin everything.

Forgive the inexpereince, but whats the best way to check and make sure the u-joints are good?
 
jamesT4R said:
Roger that. gonna crawl back under it tomorrow and start checkin everything.

Forgive the inexpereince, but whats the best way to check and make sure the u-joints are good?
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Get a pair of gloves, grab the driveshaft, and shake it real good. Any play at all is too much, IME.

If you find play, you've got to narrow it down to which u joint, or even if it's the tcase output bearing or the differential pinion bearing. But you want no wiggling at all down there.
 
Gotcha. I'll get to shakin and see what happens?

Just curious, the noise sounds like its comin from the fron of the vehicle, could that just be a wierd acoustic thing?
 
It could, or it could be noise coming from the front. :D

If the driveshaft checks out, chock the front real good, put the rear on jackstands, and see if you can duplicate it.
 
allright, no jiggle on the driveshaft, just a little rotation, not too much though. took off rear driveshaft, drove around in 4H. noise was still there, but not near as much. came back, put it back in 2H and put on the parking break and floored it in gear, alas no noise. so as much as i can figure its the rear end.

drained the fluid, it was black as night and full of metal shavings and a few small chunks about the size of rice grains. went to lift the rear end and my jack snapped.... until i get one, can I remove the front plate (where the pinion shaft comes in) without pullin the axles or will this mess anything up?

Also, anyone know of a good (i.e. cheap) place to get an OEM rear end? dont need anything fancy, and i am excited to get rid of this POS lincoln locker the previous owner cursed me with.
 
Also, I feel like an idiot askin this, but I cannot for the life of me remember what my gear ratio is. Anyone know how to tell the difference between em? other than counting the teeth obviously, I cant get the diff out yet and wanna go ahead and order the new one.

Any help is greatly appreciated.
 
If you're a stick shift, your stock ratio should be 4.10, unless you second gen weirdos have some kind of towing package strangeness. And you can't pull the third without yanking the axle shafts first, sorry :(. You can get a rough idea of the gear ratio by jacking one side up, spinning it two full rotations, and counting the number of times the driveshaft spins.

It does sound for sure like a bad diff, though.
 
gotcha, i'll start scavenging around, see if i can pick up a new (gently used) one cheap. looked through the FSM, doesn't seem too difficult. i've rebuilt a diff before, but it was a Ford 9-inch. any tips or surprises i need to know before i get ass deep in it?
 
I've never rebuilt a diff before, I have A Guy to do that for me. But if you've got 4.10, I wouldn't worry about rebuilding what you've got, especially if the PO welded the carrier. I'd hit your craigslist or local 4wheeling board and snag a complete used third for $100 or so. That's a lot less than new ring and pinion, not to mention a setup kit.

I suppose you could replace the axle seals while you've got the shafts out, but honestly, if they're not leaking, I wouldn't worry about it.
 
finally got the third member off, a chunk of gear fell out when i did, looked at the pinion, about a quarter of it is trashed..... now to find a replacement.

KidV, thanks for all the help. if ya ever come through TX lemme know and i'll have a beer waitin for ya.
 
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