Shall I just quote myself? lol
zenki07 wrote:With this model altima being so new, it's not worth it.
You'd have to find a wrecked 3.5 6spd in the junkyard, get the transmission, mounts, pedal assembly, hydraulic clutch assembly, fluid lines, shifter cover, hand brake assembly and possibly the ECU, etc. Now that being said, who knows how much that's going to be, cause there's no way you're gonna buy everything new. Let's say for argument sake, $8k. Now, to do the swap, seems like you're not planning to do it yourself and would take it to a transmission shop. Labor-wise, let's just say it's around 12 hours book time and @ $75 an hour; that's $900. Now everything I've guesstimated is on the low side, you're already @ $8,900 for the swap.
You'd be better off selling your current 3.5 auto privately to get the most money out of it and THEN buying a manual one, DO NOT TRADE IN.
Guarantee you won't be out of the pocket anywhere close to $8900 and most definitely no headaches and the entire vehicle will be under full warranty.
My pricing is not in any way exact; I'll leave it up to you to do all the research in pricing out everything if you're still serious about doing the swap. But in my opinion, not worth it at all. Hope this helped.