[ninjadaniel]

My Sierra has a whine that starts around 60km/h and is deafening at 110km/h, i wanted to know what is most commonly the cause, is it the transfer case or the gearbox & which parts would be the culpret. The car has only done 165,000kms and the gearbox shifts perfectly, id be surprised if this was the cause.

Cheers,
Daniel

[boost=money]

check if there is oil in the diffs and gearbox transfer ect, check wheels bearings, and check tail shafts/jack shaft uni's

[31zook]

when did you last change the oils?

[ninjadaniel]

cant remember tbh

[TZAR]

ninjadaniel wrote:

My Sierra has a whine that starts around 60km/h and is deafening at 110km/h,

Thats normally the woman sitting next to you......

Or more likely it is the hardfacing has worn of some of the gears. Can be caused by corrosion OR incorrect oil.

Normally in the transfer case, best bet is to find one on here for $50 and slap it in.

[steak_knife]

Or Pm that steknig dick & see if he'll have a look for ya.

[ninjadaniel]

thanks for the comments guys, i'll keep an eye out for a transfer case!

[Brocbeau]

i had the same problem, but mine was solved by draning the water out of my diff :O!
PMSL!