It certainly could be. Your trans ought to be the 722.438 which is not electronically controlled like the 722.608 is, meaning it uses manual throttle position and vacuum signals to determine shift points and firmness.

start looking at hoses and see if they are cracking and splitting.

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Terry Allison
N. Calif. & Boca Chica, Panama

09' E320 Bluetec 77k (USA)
09' Hyundai Santa Fe Diesel 48k (S.A.)