Rattle when in reverse and idle

[supra360]

I have a 1999 RT/10, I owned it for over 2 years now. When the pass few weeks I get a bad rattle when I am in reverse and idle I never use to have it before. How do I tell if its the neutral gear rattle?

 

[Ron]

If it is louder than before, not NGR. In reverse with the clutch in or while backing up?

 

[supra360]

when backing up and in neutral. ( Clutch out)

 

[CEJ]

Does the rattle change with speed when you're backing up? What fluid are you running in your tranny? How many miles on your Viper? Are the engine/transmission mounts original? Thanks.

 

[supra360]

no the rattle stays consent at any speeds when backing up. I change the motor mount 4 months ago to the http://polybushings.com/pages/2469.html. I Change the tranny fluid yesterday to amsoil, It didnt help.

 

[CEJ]

Since it rattles in neutral, have you put the car on a lift while running to see if you can locate the rattle? (with the tires chocked)

 

[supra360]

ya I am gonna have to do that. Thanks for the help. Will keep you guys posted

 

[daveg]

When in Neutral, if you step on the clutch, does the noise go away or change in any way??