Originally Posted by George Schweikle
Lots of misinformation and urban legends about the Autopark system. Autopark was only used on the longer GM chassis with the 454 engine and GM transmission. Short wheelbase version had a traditional set up with a pawl inside the transmission for PARK. This was all when GM built the chassis, and initially when Workhorse bought the chassis business and used up the remaining GM parts.The GM chassis has independent front suspension with coil springs and air bags and Workhorse has a solid front axle with leaf springs. The 8.1 engine had the Allison tranny and no autopark.
Sorry George, but your post is filled with "lots of misinformation", too.
Just to keep the facts straight
Workhorse continued making the P32 chassis with the J71 AAPB thru the 2004 model year, and then they used the J72 AAPB on the 2005 model year P32 chassis and
the newly released W-24 chassis. The use of either design AAPB was determined by GVWR, not
wheelbase. There were lots of P32s built with the 8.1L motor, but they ALL got the GM 4 speed, not an Allison, so there a lots of 8.1L motors with
AAPB. The Workhorse P32 had coil springs and IFS, just like the GM predecessor. The W-series has the solid axle and leaf springs, not all Workhorse as your post implies.