motor is 63' 28hp i just replace a lower unit that worked fine with anotherone of unknown condition in order to make it a long shaft i this one had a spacer, shift rod extension and a longer main drive gear. is it safe to say that the unit i put on was previously damaged or is it possible i did something wrong? it can be shifted into all 3 positions it doesnt feel like anything is binding but it doesnt engage the foreward gear. maby i can use the original lower unit with the spacers and extensions