Mtchlcaney Posted August 5, 2019 Share Posted August 5, 2019 Hi I own a 1970 R685 model fire truck single axle with the 237 maxidyne, a 5 speed stick, 4.88 rear end, and 11 22.5 tires. Seems like my top speed is around 53 mph. I am looking at a 1969 R611 model fire truck single axle with a thermodyne, 5 speed stick, 5.14 rear end, and 10 20 tires. Any idea what its top speed would be? I never drove a thermodyne before. 1 Quote Link to comment Share on other sites More sharing options...
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