I'm not sure why either but I'm guessing that it's a good way to test the gripping force of the disk
If the disk is really worn out then I would assume that the clutch would slip and not stall right away.....even in 4th gear.
That's just my guess though.
I don't think it would work if you had really low gears like 4:10 or lower.
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'82 GT 351W (.060)Comp Cams 274* Extreme Energy cam, ported & polished heads w/ 1.94/1.60 valves 10.3:1 flat top pistons,stealth intake, Mallory dizzy,Holley 750dp carb, BBK shorties,Flowmaster exhaust,C-4 with 3700 stall converter, B&M pro shifter,8.8 rear, 4:10's, subframes, electric fan, powermaster alternator, 4 core radiator.
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