Forged Performance: Project 370Z Race Car Build!!

Sharif@Forged

I know that the 370Z 6MT differential is identical to the 350Z 6MT differential. so 3.9 gears for the 350Z will work on the 370Z.

However, I do not know for certain, if the 7AT 370Z uses the same differential, so I can't tell you with certainty.

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wstar

The service manual only indicates two kinds of diffs for the 370Z: R200 (plain) and R200V (VSLD). The only MT/AT difference it notes is the gearing (3.357 AT, 3.692 MT).

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xiven

whats next?

javol

People at mynismo.com,

when i asked them if this Z33 product would fit my 370Z 7AT

https://www.performancenissanparts.c...ducts/?id=6135

say NOT.

What happens?

wstar

Did you ask if it fits the 370Z 6MT? They may just be saying "no" on the 370Z in general because they're not aware they share a diff.

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wstar

But in any case, the VSLD kinda sucks - it fails under excessive heat (which isn't too hard), and the VSLD part will wear out with enough hard miles anyways, which kills your limited slip for good until you get the VSLD clutch part replaced (which I imagine isn't cheap). I'm seriously thinking I should upgrade to a better LSD of some kind anyways, and change gears while I'm at it (probably just upgrade the 7AT one to the 6MT's stock gear ratio of 3.7-ish). Edit: VSLD is also less efficient than other kinds too, so upgrading can kill some drivetrain losses.

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javol

Here we go with the two OEM Nissan figure:

350Z




370Z



From the images and parts numbers, we can see that 370Z diff comes with 4 satellites..... 350Z with only 2 satellites...

The other components seem to be more or less the same...

Any of you can give a reliable tech opinion?

It would be of great interest for many of us here..... because there are a lot of ring-pinion couples for 350Z and would be important to be sure that they fit our 370Z....

Bye,

wstar

I don't have a very informed technical opinion, but based on those diagrams I would say the Ring+Pinion gear sets are likely compatible, since they share a part number. Also, I think we've already had reports elsewhere on the forums of people upping their rear ratios to 4.xx for the dragstrip, so they must've used 350Z-designed parts.

However, most of those diagrams is greek to me. I rebuilt a differential once with a couple friends (A giant Dana one on an International Harvester Scout), and it was a complete PITA.

Lots of re-trying over and over to get certain parts pressed in with a lot of force while shimmed to an offset that was precise to hundredths of an inch, and then re-measuring and seeing that the shimming needed more adjusting, pull it back out, blah blah. Then you have all the funny noises during breakin, and wondering whether you really got it right or if the teeth are .002" too deep or shallow causing problems later, etc.

So if I ever do switch diffs and/or gears, this is one job where I'm just gonna hand the parts to a reputable mechanic that works on this stuff every day and let them go to town. There's a shop here in Houston I used before to do diff and clutch stuff on my Trans Am. They're a mechanic shop that specializes in working exclusively on differentials/gearboxes/manual transmissions of any kind and clutches, for just about any vehicle (mostly big trucks), they did a good job last time around

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javol

Are you sure that 350Z diff and 370Z diff are identical?

It seems that there are different flavors of R200 diff...

Here we go with two OEM Nissan figure:

350Z (manual or automatic trans is tha same, only the ratio is different)




370Z (manual or automatic trans is the same, only the ratio is different)



From the images and parts numbers, we can see that 370Z diff comes with 4 satellites..... 350Z with only 2 satellites...

The other components seem to be more or less the same, but not EXACTLY the same...

At the end...

Are we sure that aftermarket 350Z ring-pinion couple (4.08, 3.9 etc..) fits 370Z?

Thank you very much to everyone giving his opinion or sharing his own personal experience, bye!

Sharif@Forged

Let me say, that you can install a 350Z 6MT aftermarket LSD , into the 370Z 6MT pumpkin. That is what I know for certain. There maybe some different parts, but in this application, it's a direct swap.

I wasn't speaking to whether a ring-pinion swap is possible, since we have no plans to do that, or a need to do that on the race 370Z project. Although I can make an educated assumption that they are compatible. I am merely stating that an upgraded aftermarket LSD unit will drop right in.

I generally don't like to make recommendations until I've physically tested or had my hands on the product/parts.

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Sharif@Forgedperformance.com
General Manager/Certified Tuner/NASA-PCA-BMWCAA Instructor
JRZ RS1's Available NOW...PM me
Cobb ProTuner, Uprev ECU Flash, FCON Vpro, Haltech, Motec Certified