So high RPM shifting isn't really bad for the synchros so long as they are executed with care by not slamming the gear and fast shifting and basically just easing into next gear. I searched about this online and it seems really only 3 things are bad for synchros:

- Skip shifting
- Fast shifting
- Hard shifting

The fact that the 4th to 5th up shift remains smooth even at high RPMs probably means I didn't do too much damage or caused any major addtl wear

Firmly move the shifter into the next gear, but do not rush or force it. Even when I drive fast, I still shift smoothly and don't try to rush the shifts, and I do not powershift. I leave that crap to the drag racers on Youtube.

Im pretty paranoid about this especially cause its hard to source replacement syncros. I shift slow (just hold it at the gate and wait for it to fall in) on upshifts, and on most downshifts I let SRM help me to do a double clutch downshift. I have to double clutch my little ford ranger with 255k miles or it wont go into gear and big rigs for work....so I get a LOT of practice.

I wish i could source out synchros also.... my G is currently stuck in 5th gear awaiting the replacement transmission.... this sucks...

I've seen kits with syncros and bearings for about a grand on various websites. Also there is a complete new transmission for sale in the marketplace right now I believe.

Pretty sure Z1 sells new 6MTs for under $2K. If bearings and synchros cost $1K plus rebuild labor, there's no question in my mind that a whole new transmission is the better option.

And yes, there is a brand new 6MT posted up for $1500 local pick up in the FS section (I believe local is CA).

I think it's a little cheaper than that since he has a G and its not rev matching. The G tranny is slightly cheaper since it doesn't rev match.

I think you're right ($1800ish IIRC). So even better :tup:

Sounds about right. I looked into it before I turboed the car just to see worse case what it would cost if it failed.

Does Level 10 or anyone offer upgrade services for the 6MT?

I actually just checked Z1 and it looks like they don't offer any discount for SRM vs Non-SRM manual transmissions. And the price is right at $2K. But Courtesy Nissan has it listed for <$1700 here. I can't seem to find an option to check fitment for the Sport trim, so I would assume that link is for a MT without SRM.

SRM is not a physical component within the transmission, or a different clutch setup - its electronic in nature utilizing data from several sensors, and the ECU.

Re-use those sensors from your existing transmission on a new one.

I get that SRM is electronic in nature. But I did not realize that the sensors were external to the transmission and could just be swapped over. I wonder why Z1 offers a drop down menu to chose SRM or Non-SRM. I can't imagine the SRM version comes with all the necessary sensors if the price is the same.

FSM should tell you if there are any differences.

My guess is that there is no difference.

As far as I can tell, the only difference is the SRM has two additional sensors to disconnect - Gear Lever Position Sensor and Speed Sensor (see Step 13 & 14). The gear lever position sensor appears to be part of the transmission assembly.

There does appear to be two different manual transmission part numbers. 320B0-1EA0B for Nismo and sport package models and 320B0-1EA0A for base models. Still no price difference at multiple websites. Found them as low as $1621.