So the diff is in but I ran into a snag. Seems the rear half of the 08 shaft is about 1 finger short. Swapping flanges since I'm going with a CF driveshaft ASAP. Another issue I ran into is that the 6MT axle flanges aren't threaded, so have some bolts and nuts handy. Fortunately for me this was anticipated. Trying to push through to do RHFC'S.

 

Damn this has been giving you problems for a while. Wont it be the same thing with the CF drive shaft since they are based on the coupe 6MT

 

solidus,

got to get the darn thing in... minor setback. you'll over come soon enough.

I ended up purchasing a 2009 6 spd MT drive shaft. It came from the same car that i have except MT. There shouldn't be any difficulties... Will update this weekend I hope...

 

exchanging the flange from your DS from the manual won't work? that seems to be the easy solution...

 

It's in, pulls really nice with no vibration from the 7AT driveshaft. Impressive acceleration in every gear. No CEL , and I haven't used cruise control on a car in years so I neither know or care if it works. We skipped the RHFC'S till tomorrow but I'll give a more detailed review of my install experience tomorrow.

 

So this was a long road but after a couple of drives it was well worth the effort and even more promising when I get the Carbon Fiber driveshaft. When I started I was not the first person to do this but information on how to do it was still sketchy due to the fact that in the process you tie together two different drivetrain configurations.

I read a lot on this forum and on the 370z forums and some of it paid off and some lead to question marks. In the end I got it done and it was really much simpler than it seems and I admit to having read way too much into it.

What you will need is either an 08' 5AT 3.69 differential or any 6MT differential. 2qts of your favorite 85w 90 gear oil ( I used Royal Purple synthetic ) , 12 bolts with nuts for the axles ( The 12' differential axle flange is threaded and the 6MT I had used nuts ). I attempted to adapt an 08' Sedan AT front and 08 6MT Coupe rear driveshaft and maybe I had it backwards but it was a fail by the width of one finger. The fix for this was using the OEM Driveshaft and removing the 6MT flange and swapping it for the 7AT. The nut was simply marked against the shaft . On an important note , one lesson learned about buying a used driveshaft is that if you do it make sure that the U-joints are serviceable. I didn't notice it until too late but the movement of the U-joints was not smooth and had I used them I would've been up against a clock to replace it or risk the driveshaft damaging my tranny seal.

In all I've read I expected to see the P0500 Speed Sensor code pop up and to my surprise it hasn't. ( Knock on wood.) I also kept the 6MT flange and measured the distance between the flange and the transmission for the future addition of the PST driveshaft. ( For anyone that cares it's 61 5/8" )

The driving impression was great but with adding RHFC's and not having the car tuned yet I'll withhold to see just how nice it is but I can definately say that the car has awakened. Make sure you have a 10mm allen for the drain plug too!!!

This is something that most handy people can do in their garage in about 3hrs. Most time taken up removing heat shields and exhaust.

 

I'm sorry but did you install a 3.69 rear? I'm going to install my 3.90 rear this Thursday. Just going to perform a flange swap as well, I have chatted with a few guys that just did the flange swap and have zero issues.

 

Yep I went from 3.36 to 3.69 . So far there is no issue with vibration. Just check your axle flanges to see if they are threaded on the new diff. If they are you can reuse your old bolts , if not you need to head over to nissan and get the correct bolts and nuts ( 12 ). Your 3.91 should be a hoot. With the 3.69 you give it gas and it goes hard. No hunting or hesitation, just GO.

 

Gotta give credit where it's due Chuckie did call it on the vibration. I was actively looking for it and didn't notice the first hint even pushing at extended "Late for a meeting" speeds on a freeway.

 

Ok soo....
3.69 MT diff....check
Rear section of 6MT driveshaft...check....
12 bolts & nut I will need, the 6MT diff flange is not threaded.
Is that it?
I understand your car was not able to unbolt the DS halfs Would that be maybe why it was too short?
Did you use the whiteline bushings?

 

Coop would be the authority on which combination of shafts work. I thought I understood what he did and apparently I was in the back of short bus on that issue. And the 6MT axle flanges are NOT threaded.

 

Update: Took her for a hard spin today and threw the P0500 speed sensor code. Reset it and will be turning off the code with uprev. ( I have the tuner license on my cable.) Other than that there are still no issues. Once I get her tuned for the RHFC'S it's off to the track to see what this mod does on a time slip.

 

In for timeslip.

 

Do you have a time slip or numbers of before?

 

No, I should've but I didn't.