7AT VLSD fit MT Diff housing?
 

Hey guys, just picked up a 2010 7AT Sport Touring and I love it! I already installed res test pipes, intakes and catback, but want a little more power. I'm planning on going with a MT 3.69 final gear that my friend has. I want to know if my 7AT VLSD fits the MT housing, his diff isn't VLSD and I would like to keep my VLSD!

I'm new at this so pardon my ignorance lol.

No it won't swap directly over. It would be a good time to buy a a better LSD at the time you do the swap. You'll enjoy the 3.69's ;)

I'm pretty sure the housing aka the "pumpkin" is the same for both AT and MT. How ever the actual diff, what is installed inside the housing, is different and the main difference is the final drive ratio. The drive ratio is based on the final drive gear that is installed in the diff. As far as I know you should be able to buy a 3.69 final drive gear and have it installed in your VLSD.

The diff (the "pumpkin") out of my Z. BTW it has a NISMO cover plate hence the cooling fins

Inside of the diff housing for my Z. The red arrow is pointing to the final drive gear. Also the installed diff is a Quaife ATB and the one sitting next to it is the factory VLSD.

Nope; Housing is different too (pumpkin)

In what way? Went through the service manual didn't see any differences in the housing.

I'm pretty sure I've read in many threads that the 370z and 350z MT diff housing are larger than the AT.

Instead of doing a carrier split on the differential like a lot of axel manufactures do, they manufactured 2 different housings. Though they may look they same visually, they are different on dimensions internally which is critical when setting up the gears dealing with 1000/ths of an inch


OP, also change the diff bushings out while your at it. Whiteline or Daystar

Attachment 111317
True Positraction!


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Nope, that's a Lincoln Locker ;)

:tup:
Couldn't find a definitive answer when searching the forums. Must not have looked in the right spot.

I was hoping to find a part number(s) for the housing but it appears that Nissan doesn't sell the housing by its self so they don't list the part number. All the diagrams with part numbers has a line pointing at the housing with the label "Not For Sale". The only way to get a new housing is to buy the whole differential. :ugh2:

I've been searching too Vabam,,,i may be a jackass on this one-i've seen that a few people have basically swapped everything to make it work;including stub shafts etc...
I currently have a Quaife on order w/some other parts for my 11' Auto & I've asked lot's of people over last couple years about this & everyone says it's gotta be swapped.
i'll find out today with a phone call & reply to post.
Sticking with my stock 3.359:1 Ratio~I Love the 5th gear top end!

Has anyone used a VLSD from an 7AT on a MT housing? Does it fit?

You can interchange housings. As long as you are changing all of it.

You cannot swap differential units between the MT and AT though due to the offset. I believe it is .4" difference in offset from the MT to the AT viscous where the ring gear bolts.
For instance if you try to use an automatic viscous with a 3.69 gear it will not mesh the teeth, looking at it from the rear the ring would be .4" too far left.

You can run a 3.538, 3.692, 4.08, 4.36 gear with a manual diff but not with an auto lsd or open diff unit. If you want to upgrade the gear in your auto you will need a "manual lsd" too.

If you want to upgrade the diff only in an auto we have diff options for that but not gear options without changing both. You can do either in your own housing whether it's manual or auto.

Hope this helps.

So it is indeed just the carrier that makes the difference & not the housing, so it would be basically a normal carrier split. Gears 3.538 & lower (numerically higher) = Manual diff, Taller gears need the auto diff. & Either an auto set can be installed in a manual housing, or vice versa. is this correct? I also know the axle stubs are different as well.
Thanks for the insight. :tiphat:

I think the only difference in stubs is just lsd or not. Most aftermarket lsd's will require the addition of another short lsd stub or some machining of the long lsd stub. Whole housings from 350z or G35 can be used as well, there some small case differences but nothing that has caused any issues from our experience.

We have been installing A lot of diff and gear upgrades and shipping out to clients so we have spent a fair amount of time figuring all this out while preparing more cores to build on an "exchange basis" in the future.

Felix, do you have a 7at with 3.69 FD? If so, how noticeble is the difference? Do you lose top end?

Of course you going to lose top end when you change gears... But how after are you doing 160 plus...I have 4.08 gears and love them

Yes it is a noticeable difference. you will not lose real world top end. Here is a link with video http://www.the370z.com/engine-drivet...ar-review.html

You're going to gain top end being the car will rev higher in final gear . There is no way the car can reach it's final drive Top speed which calculates to > 200MPH. You gain speed because the car will rev closer to redline in top gear allowing the car to travel faster.

Thanks guys, gonna do the 3.69 FD swap this weekend at my friend's garage, he has a 350z with a 370z diff and his getting 4.08 so I'm gonna buy his 370z MT diff.

I'll keep you guys posted, also ordered some Injen Intakes to go lagoon with my res test pipes and custom exhaust. Going to get either headers or Z1 top and lower plenum, don't know yet. Any suggestions are welcomed!

Ok the housings are the same but the carriers are different. Also yes the stub flanges are different from vlsd- to base and 350z to 370z. The little taper where the splines stop and the flange seats against the carrier is different on 350z stub axle flanges. So you will need whichever flanges match your carrier (lsd, vlsd, open, and 350vs 370z) and then that will fit in any housing. If you want to run any gear larger than 3.569 you will need to make sure the carrier (and as such its matching flanges) is one of the manual versions. Forgot to mention the abs ring tooth count is one tooth different on the 350z flanges as well doesnt make a huge difference though.

Can I swap the whole pumpkin from the MT 370z into my 7AT whitout any modification?

Yes

Sweet! Gonna do this tomorrow.

Let us know how it works; I got an automatic Quaife ordered for mine; I like the factory 3.359 gear set....hope it grips well.


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I sold my quaife manual rear end to critical and he loves the **** out of it on his auto. it made the car much faster.

Just installed tha MT differential on my 7AT. The 3.69 are awesome! Got to say that I miss my VLSD, the MT diff is open... But it was free soooo...

3rd pull way harder, just had a friendly race on a closed road with a friend with a evo X with bolt ons and mild tune, we did a 3rd gear pull (45pmh- 120mph), I pulled 3 cars ahead!!!