Hello alfredillo, what a coincedence. I purchased a 1999 Isuzu Trooper four wheel drive 124000 miles today. It was a silent drive. I tried the 4wd and shifted it from 4hi to 4lo while in neutral and at a stop. Everything worked well. After putting it back to 2hi it makes the same sound as you described.
Please let me know if you find out what the issue is and I will do the same and let you know if I find out something.
Thanks. Mwarwick72@hotmail. Com
Monday, October 19th, 2009 AT 9:29 PM