Allison Transmission announced an expanded program of lower pricing for most models in its Highway Series and Rugged Duty Series automatics. Medium-duty 2500, 3000 and 3500 HS and RDS models can be bought for $1,600 to $3,200 over a truck's standard manual transmission. These suggested retail prices are close to selling prices, Allison says, but are considerably less than before. These "proof of concept" prices are available once to truck operators in certain applications, including construction. The price of $8,500 for a 4000 and 4500 series heavy-duty model continues.