your gonna have to....... Dodge never offered the 5.9 with a manual........ ever! Now the 5.2 is offered in a manual...... maybe one could match the two together and hope the 5.9 genades the tranny. I personally don't see why it wouldn't hold as long as its a stock 5.9
Just get a 5.2 Its a better motor in my opinion any way. I'm not trying to brag, but my truck ran the same times as 5 other dak r/t's. The only one it didn't beat was one with a supercharger. All I'm sayin is, don't underestimate the 318. It is prolly cheaper anyhow. Lata.