A date with my sister says you cant figure this out!

[nvrstuk]

I have a 93 yj with an ax15 that was rebuilt about 30,000 miles ago, however, the tranny started to get "sloppy" sounding about one year ago.

I have checked fluid levels, and all seams fine, no leaks or anything. BUT, on my way home from moab a few weeks ago, I was on the freeway and at the snap of fingers it started to vibrate really bad. It felt like a u-joint going out, so I pulled over, and checked. It was just fine. I got back in and no vibrations. It now does this about every time I drive it. (which isn't often) I always have to pull over, and then it will stop and I can continue on my way. It does this at varying speeds, and in any gear. I can push in the clutch, and put it in neutral and vibrations continue not getting any better until I stop. Any thoughts would be helpful! Thanks, and good luck

 

[Milner]

(no date wanted)
Need more info, but first guess is your flywheel is cracked..
Or maybe a clutchplate, or input bearing....

 

[spencurai]

my guess is that your bolts holding your flexplate to your flywheel have come loose or are missing, there are detent studs in the flywheel that might occasionally let go and let the flexplate detach and spin freely. This is kind of an odd theory but since it was rebuilt recently, I would guess whoever did the install was incompetent. Drop the inspection plate and see if you can find some bolts in there. Something is going out of balance and then finding its place again after you stop.

I bet you a date with your sister that I could figure it out within 15 minutes of you arriving at my house in ogden....if you could make it that far before your freshly rebuilt tranny, that you insist on continuing to drive, turns into shrapnel.

 

[BBowski82]

If only it were a date with Spencurai.....then I'd be motivated to take a guess.

 

[spencurai]

then I'd have to fly to detroit and I head that you dont have much hair....that just doesn't sound appealing....

dont you think my guess is right out there in far left field...pretty cool eh?

 

[BBowski82]

dont you think my guess is right out there in far left field...pretty cool eh?

Oh yeah....way left field. I think if your guess were correct it would only hapen once..........maybe twice.............before it sheared the pin. plus if it were that loose the flywheel would just come dismounted.

 

[Andy]

I don't think 4.0's have a pin? If I remember right??? I agree with you Brandon, if they get loose they come out.


Andy

 

[jamesgeologist]

I got at least a half turn out of four of the five fly-wheel bolts on my 4.0L and a full turn out of the fifth. I have an auto, but it did help with the mid range vibes I had been experiencing last year. I still fight high end vibes that are somewhere not in the d-shafts or pinion angle. On blocks the rear output oscillates above 3k RPMS with the front and rear d-shafts removed. I think I may have loose bolts on the fly-wheel again or a harmonic balancer going bad or the Currie output shaft is bent?? These vibes get expensive!!

James

 

[waynehartwig]

A cracked or loose flexplate will cause starting problems, before it would cause vibration problems. Since it didn't do it from the beginning, you can rule out the wrong flexplate being installed.

...It could simply be the wrong fluid in the transmission (or a plugged screen).

Dexron and Mercon fluids have different properties and react differently with clutch packs in auto transmissions. You could simply have the wrong fluid in it, causing the clutch packs to grab and slip quickly. A plugged screen or bad pump would cause it, too. ...Or low fluid.

Dexron usually causes the clutch packs to expand, causing them to shift harder than with Mercon. Running Mercon, could cause them to slip.

I would start with a PM on the tranny... Dump the fluids and replace the screen. Also, drain the torque converter. Most of them have a plug that can be removed... Then fill it all back up with the known proper fluid and see what happens.

FYI you should change the fluid in your tranny at least every 12,000 miles... Do the screen too. If not then, at least every other trans fluid change.

 

[Spork]

AX-15 = Manual tranny.

Now when you say vibrate. Where does the vibration feel like it is coming from.
If you put it in neutral and turn off the engine is it still vibrating?

As for the date with your sister you're going to have to get my wife's approval.

 

[cowmilker]

I don't want a date withe your sister, but could it be a problem with your differential (like the input shaft being loose, thus feeling like a loose piece in the driveshaft), or the output shaft of the t-case having a loose bushing (you would think any wobble there would blow a seal and make you have a leak, you said there were no leaks anywhere right?), or maybe a carrier bearing?

 

[jamesgeologist]

This problem has perpetuated through a trasmission service. I use only recommended fluids. This problem actually began exactly when I installed my slip-yoke relocation kit over four years ago. I doubt it would have anything to do with that. I lean towards a tweaked output shaft from the vendor.

 

[chevtech]

Pics of said sister required before answering. Is she OK with polygamy?

 

[spencurai]

I am king of the left field....booyaa baby....did this guy survive his last trip to work because he aint replied yet...??

 

[Hickey]

Pinion nut backed off.

 

[Milner]

A cracked or loose flexplate will cause starting problems, before it would cause vibration problems. Since it didn't do it from the beginning, you can rule out the wrong flexplate being installed.

Wrong o Raindeer breath
Wife's 90 XJ had jagged crack all the way around the bolts of the flex plate. Drive fine, vibrated a little and sounded like a really ba rod knock. Drove it for a while that way....The crack was soooo jagged that the center did not even fall out once I removed it. But, it was enough to let it knock back and forth.
Started fine everytime :greg:

 

[nvrstuk]

Im back!

Ok, I have not been able to check flywheel yet, so I will get on that this week. I will also dump the fluids, and check the screen in the tranny to see whats up there. Thanks for all the input.
I have checked the mounts, and tranny mount is good, but motor mounts look a little fatigued. . . could this lead to the problem?

I will post pictures of my sister as soon as she is back from a modeling shoot. She cant wait to come home and watch a little football, after making a wonderful home cooked meal for her lucky date winner, and relaxing in the hot tub with you and a couple of her cheerleader friends!!!

 

[chevtech]

I will post pictures of my sister as soon as she is back from a modeling shoot. She cant wait to come home and watch a little football, after making a wonderful home cooked meal for her lucky date winner, and relaxing in the hot tub with you and a couple of her cheerleader friends!!!

 

[BBowski82]

I will post pictures of my sister as soon as she is back from a modeling shoot. She cant wait to come home and watch a little football, after making a wonderful home cooked meal for her lucky date winner, and relaxing in the hot tub with you and a couple of her cheerleader friends!!!

.............. :-\ ....Think I'd still prefer a date with Spencurai

 

[sbr]

tire bouncing maybe

Could it be a tire bouncing and when you stop it goes away or a bad ball joint ? When mine was doing that it turned out to be both of the above.