Re: Very Bad Vibration
 

All the motor mounts are from before the swap and looked good when I cleaned them up. I will check in the morning to make sure they are all tight but i'm almost positive they are.

Re: Very Bad Vibration
 

just grab the engine or use a lever and see how much you can move it. Hard to tell what the issue is from there, but if your T-case is tight to the trans, trans tight to the engine, and you see it move in the video, then the whole assy is probably moving.

Re: Very Bad Vibration
 

Rear hanger. Pass. side is off a little bit.

Re: Very Bad Vibration
 

Well fixed the hanger, problem still happens. No idea what to try next besides new driveshaft.

Re: Very Bad Vibration
 

Could anything in the t-case or tranny cause this vibration? Really need it fixed or i'm going back to fwd for a while.

Re: Very Bad Vibration
 

I feel like if you believe every mount is perfect and every bolt tight it's time to take things apart

Re: Very Bad Vibration
 

I've double and triple checked. Everything is tight. Only things it could be would be driveshaft which looks to be ok, trans or t-case.
What in the trans or t-case would cause that tho?

Vibration only happens under acceleration but, not just wot. Normal driving around too.
Vibration gets more intense with RPMs/ speed
Vibration goes away as soon as I let off the gas and coast or if I push in the clutch it will also go away.
Can rev it and no noises are heard and nothing is felt.
With all 4 wheels off the ground and tires off and rotors bolted to hubs it still vibrates.
Can feel it in the steering wheel as well as in the butt seat.

Re: Very Bad Vibration
 

Re: Very Bad Vibration
 

If it stops once you let off throttle, that would make me think transmission. I mean if you're still coasting at 55mph your t case is still working so that would eliminate it I would think. Unless I'm high.

Re: Very Bad Vibration
 

Sounds like in your trans to me.

Re: Very Bad Vibration
 

Maybe one of these guys who say building a trans is cake should chime in. Is the clutch properly adjusted? May have something to do with the clutch acting funny. If not when the trans is out. Grab the input and out put shafts and wiggle wiggle jiggle. Sorry I'm not more help but that's what I would do if it was mine

Re: Very Bad Vibration
 

No play on the input shaft. Output shaft has it's normal in/ out play. I'll take a pic the axle I was mentioning later.
Going to either grab Blake's or Mark's driveshaft and if it still does it then the tranny will come out.

Re: Very Bad Vibration
 

If it is only under load it could be a driveshaft u joint. Swap driveshafts like you plan on doing, if it is still there after I would check the trans shaft bearings. It sounds like a bad intermediate shaft bearing. Pop the end cover of the trans off quick and check for play on the end of the intermediate shaft. You can fully inspect the outer input/intermediate shaft end bearings with trans in car but you have to pull the second section of the trans case after the end cover.

Re: Very Bad Vibration
 

^ i wish i knew that much about tranys

Re: Very Bad Vibration
 

I feel like I would mess something up haha but I will try the driveshaft and report back. Thank you!

So I just unbolt the cover and will be able to check for play? Nothing will fall out like those 2 oil things will it?
Also wouldn't u-joints still cause an issue no matter acceleration or deceleration?

Re: Very Bad Vibration
 

Does it get worse as you get closer to 5th gear?

Re: Very Bad Vibration
 

it will vibrate sooner..so yes? First it wont do it till like 3k in 3rd it will vibrate as soon as I give it any throttle.
I feel like I keep contradicting myself whether it's rpm or speed related lol

Re: Very Bad Vibration
 

Often times under load only. If there is play in a u joint it can cock under load becoming misaligned and therefore unbalanced causing a vibration on accel. Usually regardless of the gear just load. I don't think this is your problem.

Because it is both rpm and speed related and mainly load. To me it sounds like your describing a bad intermediate shaft tapered roller end bearing.

^ saying this I'm assuming the vibration is just the roughness from a bad transmission bearing vibrating through the car under load. And that all your driveshaft angles, u joints, and cv joints are good.

Re: Very Bad Vibration
 

Tranny codes for the heck of it
kw5m332npzt
sp2221

Re: Very Bad Vibration
 

Did you swap driveshafts yet?

Re: Very Bad Vibration
 

Not yet. Going to grab marks sometime sooon. But with this snow it might not be tonight so I think I may just pull that end cover off and check for play. When I pull it off will anything fall out?
Here's a pic of that drivers axle. I wasn't sure if it was all the way in or not.

Re: Very Bad Vibration
 

Looks fine

Re: Very Bad Vibration
 

Two of the u-joints feel notchy and one in the middle is very smooth, maybe too loose?

Re: Very Bad Vibration
 

The u joints should move smoothly not notchy or binding. If there is any play in a u joint or they don't move smoothly they need to be replaced.

Re: Very Bad Vibration
 

Well hopefully it is just the u-joints! Grabbing marks driveshaft tomorrow and giving that a try. Really hope it's just u-joints.

Re: Very Bad Vibration
 

you're wasting your time on the driveshaft, IMO.

Unless the U-joints are so bad there's side to side/in and out play in the joint, it probably won't be your issue.

Most DSMs driving on the road now (wait... are there any other than mine? ;) have notchy U-joints.

I've taken apart about 4-5 in the last few months and... all were notchy.

Re: Very Bad Vibration
 

I want to make sure before I check the tranny. Don't want to drain/ drop it for nothing.
It just sounds soooo similar to driveshaft thump. I should know in a couple hours.

Re: Very Bad Vibration
 

I agree

Re: Very Bad Vibration
 

Sounds like a thump now? Or is it a vibration/bearing type noise?

Re: Very Bad Vibration
 

Will give you guy's an update once I get a car to go get the driveshaft. Taking wayyyy longer than I expected. But I did mention that it sounds similar to this earlier https://www.youtube.com/watch?v=vDl4TCJpgZ8 (45 sec.)

Re: Very Bad Vibration
 

You need drivetrain load to cause driveshaft thump like that.

With your wheels off the ground and trans in neutral, is the disturbance still present at a specific engine rpm? If so does it go away when you disengage the clutch? (pushed to the floor)

Re: Very Bad Vibration
 

Only happens while in gear. So if I have it in neutral and rev it everything is fine. Got Marks driveshaft (propeller shaft) and it still happens but it is way less sever. Also now if I have it in a higher gear going slower it will do it more and seems to get better with higher rpm/ speed.
Going to be checking the t-case next.

Re: Very Bad Vibration
 

Did you try swapping c/v shafts? Sounds like a bad front axle to me

Re: Very Bad Vibration
 

Ok maintain a specific speed say 40mph does it change severity with different gears all while the wheel speed is consistent?

Re: Very Bad Vibration
 

Wouldn't that cause a click or some kind of noise while turning?
Also managed to get a CEL to flash from it vibrating so bad.

Re: Very Bad Vibration
 

Ill give that a try

Re: Very Bad Vibration
 

Alright so I just drove around for a good while and did all sorts of tests. What I found out was..
While going 30 it was about the worst
While maintaining 40 it seemed to vibrate more rapidly in 5th
Under normal acceleration it was very mild
under about 30% throttle is when it started to happen
*Going uphill was almost impossible without downshifting
1st didn't seem to do it

https://www.youtube.com/watch?v=XHCy...ature=youtu.be

Checked the t-case and it spun smooth no sounds coming from it.
Also checked the transmission output shaft and it was ok.
Going to get a new out axle for the drivers side, if it still does it I will get the pass side as well. If neither of those fix it I will be looking deeper into the trans.

Re: Very Bad Vibration
 

If I were you at this point I would unbolt the t case and set it on the ground then pull the front axles out of the trans. Start the engine and run it through the gears.

Re: Very Bad Vibration
 

t-case is already off. Do I leave car off when going through the gears once the axles are out? What would I be looking for when doing so?

Re: Very Bad Vibration
 

Start the car and do what I said. If the disturbance is still there you know it has nothing to do with anything past the transmission.