Selling an LLC or FlP interest to a CRT

Is it still legitimate to gift  a LP interest in and FLP or non managing interest in an LLC to a CRT to avoid capital gains tax on the sale of stock in the FLP?  My client wants to establlish an LLC and fund it with stock in one of his companies and gift the non managng interest to a CRT.  The CRT would then sell the stock.  He and his wife would be lifetime beneficiaries of the CRT.

Any thoughts?