A different type of clunk

[MattACK]

This is my second cobra and Im familiar with how the driveline clunks when it is put into gear. However my latest car has that clunk along with another as the clutch is let all the way out. Happens most prominently in 1st, and gets less so as the gears go up. I can lessen or make it completely go away if I let the clutch out very slowly. By very slowly I mean 2-3 seconds of pedal movement.

It feels like the IRS may be slamming up or down and letting the clutch out slower mitigates this. Can anyone confirm my suspicion before I go spending money on bushings and bolts?

The car is completely stock except for a steeda tri-ax shifter.

Thanks, --Matt

 

[03TopDown]

Sounds almost like what i had and found the clutch packs wer shot causing lash in the pinion gear

 

[6speed]

mine does the same thing, I notice the clunk coming from the rear once I let the clutch out

 

[MattACK]

Sounds almost like what i had and found the clutch packs wer shot causing lash in the pinion gear

Anyway to verify this without pulling the gears out?

mine does the same thing, I notice the clunk coming from the rear once I let the clutch out

Have you done anything to make it better?

 

[03TopDown]

Go do a burnout and see if you got posi

 

[Dixarect]

Got the same exact problem, not terribly bad but its a mini clunk, makes you feel and everyone else feel like you can't shift! Everyone keeps telling me and I keep reading its the bushings, but i'm not so sure

 

[hotcobra03]

Front of diff bushings...very common..

Another area..front of rear sub frame bolts...by now most have replaced them..

The size wrench used will tell if they were replaced..

Stock bolt is to thin ..its like a 3/8 and replacement is 9/16..

15/18MM is stock..22mm/7/8 is replacement..

See full tilt boogie racing on all irs information

 

[MattACK]

Front of diff bushings...very common..

Another area..front of rear sub frame bolts...by now most have replaced them..

The size wrench used will tell if they were replaced..

Stock bolt is to thin ..its like a 3/8 and replacement is 9/16..

15/18MM is stock..22mm/7/8 is replacement..

See full tilt boogie racing on all irs information

:beer:

Good info, thanks! Car is going to go on a lift after christmas and want to get this fixed.

 

[MattACK]

So believe it or not, for a 90k mile car, all subframe bushings and bolts were good. There was a lot of slop in the rear end when we put it on a lift. My buddy pulled the diff and it was nasty as hell, tons of play in it. New clutches and shimmed up, it is being put back in tomorrow along with some exhaust upgrades.

 

[ac427cobra]

Front of diff bushings...very common..

Another area..front of rear sub frame bolts...by now most have replaced them..

The size wrench used will tell if they were replaced..

Stock bolt is to thin ..its like a 3/8 and replacement is 9/16..

15/18MM is stock..22mm/7/8 is replacement..

See full tilt boogie racing on all irs information

Not just front diff bushings but the rear as well. VERY common in these cars.

:thumbsup::coolman::beer: