Transmission Noise problems of the 1999 Chevrolet K1500

Abs pump went out, luckly I had an extended warranty and only had to pay $100. 00 instead of $800. 00. Also many other trucks in the area with same problem. Had klunking noise in rear end carried to two different dealer ships and could not find anything. Sounded like transmission was playing catch up with rearend. Three months after warranty goes out it does the same thing and bust the gears in transmission. Motor sounds like it is knocking when you first crank it up. The dealerships around are quick to sell you a car but will not stand behind you when there are problems. This will probally be my last chevy!!!.