grinding/rattling noise

Post by **reprise** » Wed May 07, 2008 12:14 am

hey guys, im getting a wierd grinding/rattling noise in hi range 4wd in my 90 sierra. it happens in 3rd and 4th gear and now seems to be hitting 2nd. only in hi range. it only happens when i am not accelerating. as it only happens in 3rd and 4th gear i cant get underneath at the same time as the noise to try and isolate the problem. im assuming transfer case something maybe loose??

any ideas?

cheers

Post by **alien** » Wed May 07, 2008 12:32 am

i had something like this a while back - turned out to be a busted engine mount vibrating at certain RPM's.

Post by **reprise** » Wed May 07, 2008 4:02 pm

But It only happens in 4WD Hi, if it were a busted engine mount should it not rattle all the time? or at least at accross all transmissions?

Post by **alien** » Wed May 07, 2008 4:38 pm

it didnt for me.... for me it only did it in 2hi... from memory only in 2nd and 3rd gear at certain RPMs... tried everything before realising the mount was sheared =)

Post by **reprise** » Wed May 07, 2008 5:02 pm

Cheers i'll have a look this weekend. Hope that is all that is wrong with it

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