Re: Toe-in Alignment tool
The chains cannot be longer than the height of the front wishbone arms from the floor. Otherwise the wishbone will knock the trammel off the tyres as you roll the car forward and the trammel rises up to meet the wishbone. 6 inches sounds about right. It is defined in the Ford service bulletins, where the toe in figure is specified as being measured well below hub height by Ford.
I am not in a place where I can look it up tight now. Somewhere on the Barn recently the Ford service method was reproduced.
SAJ in NZ
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