D100 won’t get over 50

Hay everyone, recently got a 1974 d100 318 and the tranny is shifting but the truck itself won't get over 50mph. As far as I can tell the only thing wrong is a rear differential leak. Any Ideas before I decide to open up the engine Thanks

Hay everyone,
recently got a 1974 d100 318 and the tranny is shifting but the truck itself won't get over 50mph. As far as I can tell the only thing wrong is a rear differential leak. Any Ideas before I decide to open up the engine
Thanks

Thu, 05 May 2022 17:25:20 +0000
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