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1988 Mack RD-686SX Heavy Haul Tractor

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9 hours ago, HeavyGunner said:

A 10 speed in a heavy haul truck seems a bit odd, but it’s certainly a beauty. 

I was hoping to see what gear ratio was stamped on the carriers but I couldn't because of the fifth wheel plate and design of the rear fenders.



It doesn't cost anything to pay attention.

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8 hours ago, Rob said:

Usually means "Dynatard" engine brake installed. Being that late however the analogy could have carried over to the Jacob's engine brake but I'm not sure there.

It's a glider. The endt tip turbine motor wasn't used anymore in 88, they had gone to the E6 4valve. Forgot about the dynatard! 

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