youngstown.bulldog80 Posted March 21, 2018 Share Posted March 21, 2018 Hello. Recently, someone showed me a local advertisement for a mid-70's U686ST...the seller included the following statement in the advertisement: "...this U686ST is basically a short version of the R686ST just with an off-set cab. It has a 237 Mack engine and 10 speed transmission." I'm guessing the "237 Mack engine" he's referring to is the ENDT-675. I don't know a lot about the U models (aside from the off-set cab, short bumper to B.O.C. length, and lighter frame/axles as compared to the R model) so I am just wondering if the comparison statement with the R686ST is accurate. Also, I did not know that a 10 speed transmission would work well with the 237....was installing a 10 speed transmission a good move by the previous owner? I had just always assumed that the 5 spd or two-stick 6 spd transmissions were more common with that particular engine. Quote Link to comment Share on other sites More sharing options...
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