Ok so this noise is getting to me and I'm scared something's going to blow at the worst time, btw sorry for the long description.
So i bought the car recently on 235/75/15 maxxis bighorn muddies, car is fully stock other then the 2" lift with extended shackles, gearing isn't the best as its stock but it mannages alright.
The noises are: as I'm driving at any speed under full acceleration and when costing i get a grrrrrrr sort of growling sound. If i apply a tiny bit of throttle so its not quite costing it will stop, but come a back as i accelerate more.
Also there's a whine over 90kph in 2wd and a whine in 4lo when i reach around 3rd gear in the beach
I have removed the tailshaft and locked hubs and driven it in 4hi as a front wheel drive and the problem is 60% quieter so i assumed the diffs worn too, i then swapped the transfer cases to one that never made any obvious noise from my other sierra, and reconnected the tailshaft- the car was almost perfect and there was no whine at 90 or over, tho thee was a bit of noise still while accelerating etc.
After a 150km beach run like this the sound is worse then ever before
I guess this must mean its a diff issue? I'm really lost and cant seem to pick out the issue-
Thanks a heap!
josh