Apr 23, 2020 · Top 5 Causes of Transmission Fluid Leaks. Your transmission may leak because of minor issues or critical ones. Despite the type of problem that it is, you should never let a leaky transmission wait. Lincoln Electric® Precision TIG® 275 Ready-Pak® TIG Welder, 208/230/460 Volt With Under-Cooler Cart Water Cooler, Foot Amptrol®, PTW-20 Pro-Torch™ TIG Torch With 25' Cable, 15' 2/0 Work Cable And Clamp, Gas Regulator/Flow meter And 10' Hose Kit, Parts Kit, 2 Water Hoses, Torch Adapter And Zippered Torch Cover. Airgas Part #:LINK2618-1 The most common passenger side 7.3 oil leak is where the oil dipstick enters the oil pan — the dipstick adapter. You’ll see a large nut on the rear passenger side of the oil pan. As a quick fix, you can try tightening that nut a little. But be careful, you can over-tighten it pretty easily and then it won’t seal again.