batty200

iTrader: (3)

Aftermarket performance clutches use stiffer springs in the hub or bone and on decel the gears are banging around in the transmission. A solid hub clutch is much louder than a sprung hub.

EvocentriK

I have a couple really odd noises that just started tonight. It's a really loud whine on decel but only does it when coasting in neutral or in gear with clutch in. The pitch is speed dependent. There's a not constant (comes in and out most audible when slowing from slow to moderate speed to a stop) gravelly noise that occurs when decel in gear like described in this thread. Sounds kinda like pipe against heatshield but its not. Yes I have an aftermarket clutch but its single plate and most importantly the whines started too and the cars made no noises before tonight. Anyone had this before? I'm thinking the rear diffs let go?

barneyb

I've had my Evo for 9.5 years and it always has made the decel noise. Before I bought the car I had a Microsoft rally car game and I always chose the Evo to drive. Well, every time I slowed the car when playing the game this strange coffee grinder noise would occur. The game was making the decel noise.

cmspaz

iTrader: (1)

It's tranny bearings. I thought it was the input shaft bearing, as it made a light whirring noise at idle with the clutch engaged as well, and had done so since I bought the car in 2010. That's been replaced and the noise is still there.

Over time it got louder, and it's now a loud clattering noise. The decel noise increased in volume with it. The tranny will need to be rebuilt and all bearings replaced. I could care less, it needs syncros anyway so it's not like it's too much of an extra expense.

EvocentriK

I have recently installed a rebuilt TM, so I highly doubt it's that. It only does the 'coffee grinder' noise lightly occasionally at very low speed right before coming to a stop, it's more the 'what sounds like transfer death whine but isn't' on coasting with clutch in or in neutral that I'm worried about. In gear decel/ accel = no noise.

evos2k2002

Clutch drag need adjust may be

EvocentriK

Doubt it, shifts are fine and no forward movement at 7000rpm with clutch depressed when stationary and in gear as per Jacks transmission test.

It's decel whine when in neutral or clutch in, and a bit of decel growl/rattle when in gear. Noise is not audible when lightly accelerating/holding speed (maybe a really slight whine).

EvocentriK

OK ended up I had 2 noises going on at the same time with different origins. The whining was definitely my transfer case, dropped the oil and this is what the drain plug looked like:



Had the transfer rebuilt with all new OEM internals, and that noise is no longer present.
I still have the metallic buzzing on decel only though, wouldnt call it it coffee grinder its not that loud or rough sounding, it sounds like vibrating heatshield and only on decel or super light throttle when it's hovering back and forth between decel and just maintaining speed, as soon as throttle is reapplied it's quiet again. Maybe it is my clutch like so many others (Carbonetic Blade Single plate)