Coop,

if you're sticking with OEM shafts, since its two pieces, you prolly have to swap just the piece with the flange, and maybe not the other piece with the Yoke (or nose as you were referring to).

Didn't know about the OEM convertible gear ratios, not bad if someone wants a slight power bump and still get decent gas mileage compared to 4.08.

 

We're on the right track now! Black Betty has the answer. He has a 2008 G37 Coupe with the manual transmission. AND he has the stock driveshaft out. If we can talk BB into taking some pictures and getting some measurements, we may have an answer.

 

From what I can gather in specs, ALL G35 or G37 standard trans driveshaft are the same. And, that said, the G35 auto trans driveshafts up until 2007(?) have the universal joint at the rear, too. Same thing?

Sure would like to have a bunch side by side to measure. When I did a search at 'car-parts.com, it appears to be an interchange.

I am readying to leave tomorrow AM for the weekend on a photography gig. I won't be back till Sunday eve to discuss or evaluate. Carry on...

Coop

 

I already have all the pertinent measurements for the 6MT shaft. Every measurement that the drive shaft shop said they needed.



A1 67.75"
C1 40.50"
C2 27.25"
L1 37.75"
L2 30.00"
W1 26.75"
W2 27.50"
T1 3.50"
T2 3.00"

You're welcome.

 

^^^ Wow. Captain accurate.

Thank you!

Coop

 

Inaccurate or incomplete measurements are worse than worthless. Imagine giving a shops specs and getting a finished product that's .5" too long. That'd be tragic.

 

Maybe I am missing something here but I sent an email to Z1Motorsports several months ago about 4.08 Nissan gear fitment to auto and their respond was yes it'll fit to 2008 g37s auto so I'm reading your thread and i see that you got g35 diff and now you're working with your driveshaft... Why go throu all that trouble when you can use your existing diff for 4.08 nissan gear?

 

I wish you are right. Show me one build where the OEM housing was used. I've scoured the forums and this and the 370Z forum and come up with the same conclusion: You have to change the housing.

All this said, what IS the distinction? I would really like to know.

And, once the 4.08's are installed, no matter what the housing, the lack of the external pinion shaft extension into the OEM rubber coupling will be trouble fo higher HP cars. That would be me.

I'd like a clarification too. I'm only following orders, sergeant!

Coop

 

i'm working on that.. lol i just got the car last year and i'm having gtm TT in work. I'm also doing my research before i do anything. But yes i've been looking for quite some time and most likely i may play with it in fall... i know it's long time but i just like to drive the car thru summer time and make more changes down the road.

 

My 4.08's have been ordered and should be on their way to me soon (you the man Black Betty). I will try to stuff them into my AT housing.

 

I'm working under a new theory. I think all the housings are of the same size. I do know there are two types of housings that are used and I have a bunch of pictures showing they are used in both manuals and autos.

What is possibly different is the differential that is used. Most my information comes from the 370Z forums and the use of the rearends are not common between the 370Zs and the G37s so my theory is not concrete yet. For example, the 370Z autos use the same pinion flange as the manuals whereas the G37s have a different flange between the auto and the manuals. Added bit of information, the G37X (all wheel drive) models use a third type of flange.

The thing people are saying is that the differential size is different for the autos and the manuals. The 4.08 gear set is the same size gear set that is used on the manual differential. If you were to buy an aftermarket differential the same size as the manual differential, you are good to go. OR if you use the stock differential from a manual rearend, you are good to go.

I've ran out of time and have to go to work, I'll post more later with links if I get a chance.

 

Here is one of the links that has a bit of information:
4.08 Gear Install (7AT) Review - Nissan 370Z Forum

 

So if this is true, installing the 4.08's onto an aftermarket manual LSD (Quaife, et al...), you could save the trouble of acquiring a manual LSD from Nissan.

Not 100% sure.

This is confusing, but we're clarifying things. Thank you.

Coop

 

Yes. But we (the G37's with autos), still have to figure out the driveshaft coupling.

Anyone have a used driveshaft from a manual they want to sell me real cheap?

 

OK, I did a little searching (car-parts.com) and there are G35 AUTO driveshafts available within an hour for less than $100 ($50 in Brooklyn!).

For me, although I'd like a one-piece carbon fiber shaft, getting one custom made (before I disintegrate the 3-bolt flange and rubber unsupported coupling) isn't going to happen soon enough.

Time to make a call and drive to a boneyard with the existing manual 4-bolt rear diff flange I have, to see it it's a match.

I'm not convinced the front part of the two piece driveshaft for a manual is the exact right length. This would only be so if the transmission output shafts are exactly the same length. It would be much easier for Nissan to change the length of the driveshafts as needed.

I'm willing to risk the cost of a driveshaft (even if temporary), than risk catastrophic failure.

Still working on leads...

Coop