Tranny thuds, opinions need

[Hark_Z]

Alright my car is thudding from underneath the car semi-badly. It is worse when I let off the gas and gets worse the faster I go. I just checked the driveshaft which is tight, U-joints are tight also. I was able to check the rear tranny joint which was sound and it was fine. I only have ramps here at my house so I wasn't able to get under the car in the front to check the other tranny mount which could be the solution. Aside from those things, what else do you guys think my problem could be. The man who tuned my car said that it's not running right because he didn't set the rev limiter high enough for my tune and he's gonna correct it and my problem will be solved. I'm not so convinced. My pedals shake violently as well as the steering wheel. I don't think it's my rear end, could be wrong though. Any one having similar probs? help me out please.

[Fenster]

My guess would be tranny mount.

[Hark_Z]

I could also need my driveshaft rebalanced, but I don't it, I'm running out of ideas. Don't know where to start between it being the D/S or the rear end. I explained all the symptoms, just need someone with experience now, :).

[Chris 96 WS6]

Check the trans mount first and get that out of the way. They break a lot and they are cheap to replace. You can get a poly mount at Autozone.

A broken trans mount would cause the rear of the transmission to come up and smack the bottom of the car. It could also cause incorrect u-joint angles on the driveshaft, causing vibrations.

Eliminate that first, then go to the next thing.

[CamTom12]

Yeah, it sounds like a mount to me

[Hark_Z]

Well I just had the car thorougly checked and some parts the of drivetrain could probably be replaced but the problem is of two concerns:

Something to do with my PCM tune. I've explained my situation a lot but I'll do it again. My car shut down at 105 from the factory, when I got my gears installed it shut down at 80 because the computer misread it on the speedo, When I got my tune, it removed my speed limiter, but right at that spot (pretty much right at 80), the car got VERY rough, and rougher the faster I go.

Next thing, it is connected to my rear end also cuz it is pretty much when I get into 4th gear (around 80) where this happens. I think it is related to the pcm tune but the problem is the rear end. It sounds like it could be a chipped tooth, or something of that nature but it seems too ironic to me that it appears right at that instant where my limiter was removed. These things are obviously connected, so I hope it gets better when my rev limiter is set higher like my tuner promised. Although, it doesn't sound very comforting. Plus my steering wheel and driveshaft shake as it is because my power steering pump is broke, makes the problem harder to detect, along with a misalignment, unlevel shocks, sagging body, and uneven tires because they have worn differently and I can't rotate them. Sorry had to let some of that go. But that all affects my problem.

[Jaberwaki]

boss man
I dont know what else to tell you but everyone else has pointed you in the direction you need to look first....
the tranny mount would explain all of your problems and no physical shake is being cause by your tune at 80mph...
if it is then you are detonating so bad that your motor has already eaten itself...

look first, tranny mount, second rear end yoke, third bushings

[Hark_Z]

I had the rear end taken apart about 3 weeks before my tune. It was taken apart because Jiffy Lube screwed me and didn't give me the posi limited slip additive I needed in the rear. So when I got it added, There was no shavings of any sort and the teeth and everything were in perfect condition. So yeah then 3 weeks later I got my tune then this happened. I'm pretty sure the rear end if free from any foreign material and the teeth are fine, but something happens at 80+ in there. I tried raising the RPM's to about 3200-3400 in 2nd gear going around 55 to replicate the same spot in the powerband I would be at going 80, but it's hard to distinguish because the car is always gonna be loud and 'vibratious' when you are in second going about 55, plus the highway noise from going 80 makes it difficult to detect.

[Hark_Z]

boss man
I dont know what else to tell you but everyone else has pointed you in the direction you need to look first....
the tranny mount would explain all of your problems and no physical shake is being cause by your tune at 80mph...
if it is then you are detonating so bad that your motor has already eaten itself...

look first, tranny mount, second rear end yoke, third bushings

Where exactly are the secong rear end yoke and third bushings located?

[Fenster]

HOLY ****ING SHIT!!! :roflmao: Was that a joke?

He was saying... 1) tranny mount, 2)rear end yoke and 3)bushings

[Hark_Z]

HOLY ****ING SHIT!!! :roflmao: Was that a joke?

He was saying... 1) tranny mount, 2)rear end yoke and 3)bushings

I'm not sure what exactly they are..:P

[Fenster]

Rear end yoke is actually on the rear end housing. Its what the driveshaft attaches two via the u-joint. Two straps hold the DS to the yoke. It could be bad...

[Chris 96 WS6]

REPLACE THE TRANNY MOUNT FIRST!!!!!

[Karps TA]

Don't listen to these guys. They are all newbs. It's obvious your gription ratio is all messed up. You probably have a bad tractioner circuit in you PCM. What you'll need to do is upload a 1074 bios which will realign the gription. Once that's done you jack it up like a mutha and go roast some Rustangs!

[Bill]

Like Karps said: Realign the Gription and then Jack it up like a motha and you should be all set

[Hark_Z]

Unfamaliar with this language but sounds good to me and I hope it's the problem.

[Hark_Z]

HOLY ****ING SHIT!!! :roflmao: Was that a joke?

He was saying... 1) tranny mount, 2)rear end yoke and 3)bushings

I'm an idiot insomniac it would appear. I feel like an idiot now, I just now realized what I had said. :twak:

[Transamman25]

I was gunna say replace the shifter fluid with antifreeze that way youll never miss a gear or get stuck in a bad gear

[Helmsdini]

Im with karps as well.. definatly piston to gription ratio. Most likely causing slipping in the 3rd bearing.

[Hark_Z]

It will just be relieving to me if I can pinpoint a certain area causing the prob, cuz obviously it can be so many things.

[Transamman25]

Hark bro your describing the trans mount .. do it come back say thanks guys .. your problem is solved .. lol now quit being lazy .. good luck

[Red Devil]

Go buy a manual and find an online glossary. Feeding time is through. Thank you.

[Hark_Z]

(reply to TAman25)
If......only....it.......was.........that........e asy.........already checked 'em man and they are sound. I might as well replace them though guess it couldn't harm anything for down the road. ARGHHH. :banghead:

[Transamman25]

how did ya check em ? on a rack ? cuz 300 lbs of trans are hard to move if your just trying to shove it .. from the side of the car .. when they rip they look good cuz there smashed it takes a decent rack .. or oil change bay with a trans jack

[Bill]

Muffler bearings sometimes make that noise. Might want to check that too when you're under there checking the piston to gription ratio

[Hark_Z]

Pretty bad to mislead me like this when your a moderator.

[Chris 96 WS6]

Pretty bad to mislead me like this when your a moderator.

They were just having a little fun, nothing to get bent out of shape over. Its important to laugh at yourself every once in a while, don't you think?

I think you were getting overloaded with info and confused. The humor gave us a chance to bring the conversation back to reality a little. At least IMO.

You now have a good course of action in place to tackle your problems in a logical way. Start with the trans mount and if that doesn't fix it go from there.

How many miles are on this car?

[CamTom12]

I'm also curious on the milage

[Hark_Z]

around 53,000 orig.

[Frosty]

Wow....

[Hark_Z]

Kinda sad yes, it's why it makes me wanna deny all these problems, cuz when you look at it, everything is falling apart with my simple bolt on's and ring and pinion swap.