Outer Limits 4x4 Board

hey guy's ive just got my first sierra 91 modle i brought off a mate coz it has a loud noise while driving and his to lazy to fix it
i was just wondering what the first things i should check are at the moment i have the transfer case out and am thinking about pulling that apart, but was thinking it might be coming from the gearbox.
the noise starts at about 30km'h and just gets louder as you speed up also im pretty sure its not the diff

First thing to check would have been all the ratio's and combinations in the driveline. Find a gravel road and drive along testing out the driveline. Isolate where and when the noise comes from.

A bit more description of the noise will help. Is is a whine, grinding noise, scraping etc etc. Have you checked that there is oil in the drive line.

The more description and details you can give, the better we can help.

Layto....

the noise is a whine that just gets louder as you speed up once at 100km/h its real bad and ya cant even hear the cd player.
the car is completely stock so i think all the ratio's are ok
i prob should have done more checks b4 i pulled it apart like pulling the rear tail shaft out and seeing if it still made the noise while using the front diff

johnno

sounds to me its eather in the rear diff or the transferput the transfer back in and leave the rear shaft out and go for a drive in h4 if the noise is gone its the rear diff if its still there the transfer

jimbo

jimbo jones wrote:sounds to me its eather in the rear diff or the transferput the transfer back in and leave the rear shaft out and go for a drive in h4 if the noise is gone its the rear diff if its still there the transfer

jimbo

or its rear wheel bearings.

jimbo i think i might try do that this w/e if i find the time to.
i was also wondering how hard the gearbox is to get out could u just lift it out or is it too heavy?

the wheel bearings feel ok and i think my mate did them b4 he sold it to me

The gearbox is a 30 min one man opperation. About 25kg or so with no oil.

Layto....

just pulled my transfer apart and found a destroyed roller bearing and there were a few ball bearings floating aaround in there so i have to get a bearing puller to find where they came from

jono-lux wrote:just pulled my transfer apart and found a destroyed roller bearing and there were a few ball bearings floating aaround in there so i have to get a bearing puller to find where they came from

while its apart put some 6.5-1 gears in theres a set on ebay at the moment there the rock hopper brand

jimbo

i think i will do that another time at the moment im just trying to fix this noise so i can get a roadworthy on it then i will start doin it up

lay80n wrote:The gearbox is a 30 min one man opperation. About 25kg or so with no oil.

Layto....

Is this on a hoist or just on jack stands.

either

bit longer on the stands but not too bad.

putting it back in can be a pain with the crossmember getting in the way and clutch alignment.

some cut a V notch in the crossmember and it helps it out going out and in.