11.9 is just barely faster than stock specs... Of 12 seconds, so, not a ton faster.
If the casing states 3.07, it's possible the ring and pinion were swapped from a taller diff.
The tach is the mystery, 4K at 70 is screaming for sure... I can't imagine how the tach could be off, if the gps has verified the speeds... With a 3.07 unless the torque converter is seriously shot.
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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!
My drivers:
1987 190D 2.5Turbo
1987 190D 2.5Turbo
1987 190D 2.5-5SPEED!!!
1987 300TD
1987 300TD
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!
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