Re: Twin Traction

Posted by Deacon Bill Ladroga On 2009/11/23 19:53:14

"Twin Traction" was the Studebaker trade name for a non-slip differential that I think was similar to the Chrysler products differentials of the same type. I'm trying to find the reference material that I had on these units, but I seem to recall that they might have been provided to both corporations by Wagner. The differential used friction disc clutches. It was available on 1957 and 1958 Packards (actually Studebaker President Classics with Studebaker 289 CID V-8s and superchargers). The option was also available on later Studebakers in virtually all models. A pot metal emblem with the italic letters "TT" in a circle was mounted on the driver's side lower corner of the trunks of so-equipped cars. I had the Twin Traction differential in my 1957 Studebaker President Classic. On Studebakers, a tag was installed indicating that the car had Twin Traction but if it was missing, you could remove the differential filler plug and look for the two-piece case and cross pins used in this type of differential. They were pretty rugged units and I never had any problems with mine. I have the two pages from the Studebaker shop manual for 1957 (when Studebaker first supplied the units) for anyone who might be interested.