If indeed a non-posi (doubtful), I use an even easier method. Reach underneath and put a mark on some part of the driveshaft or U-joints. Then, on level ground place two opposing wheel chocks so that a tire can only rotate on revolution before hitting the opposite chock (Tip: eyball a valve stem clock position to set up the one revolution distance). Have someone slowly push the car in between the chocks while you count the number of turns on the shaft.
My bet is on a 2.41 though for your stated 77 combo.
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