Stop in for a cup of coffee

Rainy Day Auto said

Well freaking frack......I should have went out tonight and forgot this car.

I could swear I measured 51 inches

I could swear I did the math and it came it to 51 inches.

The front yoke is bottomed out and the driveshaft is too long.

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For a 2nd gen Plymouth A-body:
51 " would be about right for 3 speed manual, or a 904 with a small dif.

from the '68 Plymouth FSM
Manual Transmission 3-speed; 170, 225, 273, 318 C.I. Engines 7 1/4" Axle
51.43"

Automatic Transmission;
170, 225, 273, 318 C.I. Engine 7 1/4" Axle
51.43"

Driveshaft length given from centerline of front yoke bearing bores to
the centerline of the rear bearing bores.