1999 Service Manual, Ram Truck, 1500 - 3500, 2 & 4 Wheel Drive. The phone numbers in the front of the book are as WD stated. On the back cover there is a number in the lower left hand, 81-370-9108, probably the manual number but, you more than likely won't need it to order. First thing I did when I got mine home in 5/01 was read the owners manual front to back and then call the number in the manual to order the "Service Manual". It was money well spent, I think it took 5 - 10 days to arrive.
I agree Haynes manuals are not the greatest. Good Luck.