I have done that 2 times. First time, I went to the dealership and had
never been there before. They ask me to put down $500 on a new
Silverado in 2000. Ordered it Feb 2nd, it was built the week of Feb
28th and I received it on March 6th. A little less than 5 weeks.
Second time was the same dealer on a 2003 Silverado. This time there was
no down payment and they told me to expect 8 weeks for delivery. That
was Jan 14th. It was built on Feb 17th and I picked it up on Feb 21st.
A little less than 7 weeks.
Hope this helps.