Houstonsc300

iTrader: (1)

My evo did this too..but I figured my rattle out. My turbo down pipe was hitting that lower sub frame cross member tube. Even with the spacers it just barely was touching it causing the rattling noise. I put some more washers in it and no more rattling. The car still makes pretty loud gear noise when on decel in gear and other **** rattles on the car too, but one rattle down...about 3 more to go.

lonestarevo83

iTrader: (12)

Exactly.... It does have an aftermarket clutch that had been installed right before I bought it. I checked all the exhaust components and the underside of the car, but to no avail. Still got the sound.. but car is running good with no problems.

GrnEVO

iTrader: (7)

have you guys checked the dust sleeve on the driveshaft? Mine did this and it freaked me out until I found it. I thought it was a clutch or transmission issue but it was the dust cover.

njboy

iTrader: (1)

Interesting. Will be checking this out on the next oil change. After driving through a big water puddle my EVO started buzzing around 3000 rpm @ 40 mph. Will also check heat shields. At first could swear it was the ABS pump or the ACD pump. :-/

Turn9

Could be a bunch of things, you need to run it on a lift and inspect. I've seen everything from input shafts gone bad to shredded transfer cases, but the majority of issues are things rubbing from mods so don't start worrying yet.

Craig King

iTrader: (11)

See, my Exedy twin does not rattle on decel, but it rattles like crazy when shifting between gears. The 1-2 shift rattles the most.

dpacific

iTrader: (8)

Serious reply check your tire pressure, if the wheels are off your diff will make noise.

Sim2k

iTrader: (5)

Bumping this thread up. I recently had to replace my downpipe and temporarily put the stock DP on while I waited for the new one. But I noticed while on the stock DP that the decel rattle had reduced considerably, almost to none at all. I got my new 3" downpipe, put it on, rattle is noticeably worse. I also had to put spacers on the tie bars so there's about 1/4" gap (is that enough?).

I'm going to do a test drive without the tie bars on but does anyone have any other suggestions ? I'm almost thinking of going back to the stock DP and accept the minor power loss just to reduce that rattle.

Same rattle as everyone else, decel rattle more noticeable in 4th/5th gears.

Sim2k

iTrader: (5)

Well it's not the tie bars, I removed them and test drove the car. Same old rattle.

Quattlebot

Op did you ever fix this problem or figure out what it was?

Name User

iTrader: (1)

I've had this for over a year now after some drivetrain work (new t-case). I believe it started when the trans was reinstalled in a sloppy way. Some theories are throwout bearing or input shaft bearing, something like that. I remember reading that it's possible to rest the transmission on something while putting it back in which could cause this.

I don't remember the exact details but it's an obnoxious deceleration noise that's harmless, even though it sounds like something is seriously wrong. Happens ONLY when decelerating in gear, silent with the clutch in, acceleration or idle. I gave up.

Quattlebot

Yes same here. I have a built jacks trans with RS lsd and an overhauled tcase so it leads me away from thinking it’s any of those. The noise is horrible and it honestly sounds like someone is shaking a can of rocks on deceleration. I just wanted to make sure it was somewhat normal.

Brandoboosts

sounds like a throw out bearing to me. mine made that exact sound and when i put in my 6 puck i took out the old bearing and it was beyond toast.

Quattlebot

But if it was a throwout bearing wouldn’t it have failed by now? It doesn’t seem to mess with the cars drivibility at all. It just seems like an annoying noise.

Brandoboosts

no, i had a bad throwout bearing that was loud as hell that went on for about 4 months until i got it fixed. i got lucky it didnt go out on me until i got it replaced when i did my clutch.
DO NOT NEGLECT A BAD THROW OUT BEARING. the noise is there to tell you its bad.