TALLMANTWO Report post Posted March 2, 2016 How do you tell how many speeds you have by the Vin looking at a 2006 WH. Share this post Link to post Share on other sites
wolfe10 Report post Posted March 2, 2016 Tallmantwo, Welcome to the FMCA Forum. Do you have an Allison transmission (i.e. Workhorse W chassis)? If so, there will be an identification plate on the transmission itself with model and serial number. With that and a quick call to Allison (800 252 5283) and you will know. Share this post Link to post Share on other sites
