Highlander, some of the Task Force big trucks had dual systems with dual HydroVacs, I can look in my shop manual and see if there is more detail but I'm pretty sure that system was used on tandem axle tractors, just a thought.
1957 Chevrolet 5700 LCF 283 SM420 2 speed rear, 1955 IH 300U T/A, 1978 Corvette 350 auto, 1978 Yamaha DT175, 1999 Harley Davidson Softail Fat Boy
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