My plan was for my TPS/RPM window switch to activate on 3rd and 4rth and if this is the case then a 75 shot with a tranny cooler should suffice or so I believe...of course all this would be done with an uprev tune not just slap it on and call it a day. Decisions decisions...I've been told by you and another forum member that the gears itself brings out the monster in our vehicle (NA of course) but I just thought for a second with gears stacked with some nitrous could be epic but like most of you say its not a great idea...

it would lay down some epic black lines on the asphalt in 2nd gear haha I can agree with you on that, but i would def recommend a Valve body upgrade.

-Juan

Ok then ill go ahead and do 3.69s and 75 shot...ill do a build thread later so I won't hi jack the OPs thread but I can't find a 370 diff so ill just use a 350 diff manual base model with a quaife man I'm so pumped for this thanks for the help juan

Just want to add g37 pumpkin works also.

I swapped mind form open diff pumpkin to one from g37 w\vlsd.

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Where can I get just the gears? My z is up on a hoist with an open pumpkin waiting for a new axle stub... Quaife diff going in

g37 sedan pumpikins do not work only the coupes. the sedans have 3bolt driveshafts

If you have an Auto, you can't put the lower gears in because Nissan decide to use a wacky pumpkin scheme instead of going with a typical carrier split that most other manufactures use. :shakes head:

All you have to do is change the flange. Yes you will need to ensure you put proper pre-load on the bearings, but it's not that big of a deal, especially if you are changing the differential (inside part). it would be a good idea to freshen it up with new bearings anyway, so as stated earlier, the pinion drive flange difference is not a problem, just swap it with the one you have. ;)

It is when most guys expect to just bolt it on, swapping the flange requires a new crush sleeve which means setting the pinion preload and most guys doing this swap dont want to mess with setting the pinion too loose or tight and burning up the bearings and gears. And the layout on the inside of an automatic pumpkin is the exact same as the manual pumpkin just some stuff is shifted a little and i believe the id of the ring gear is a little smaller.

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True, but I was answering in the question in the aspect that you could use the pumpkin, but yes it would not be a direct swap ;)


Of course it looks the same inside, but when setting up gears, those .001's " make a big differnce in longevity & noise/whine (or lack there of). I don't see you installing 4:08's in an auto pumpkin with out grinding the gears to make them set up correctly. $.02 YMMV :cool:

I know its different its just when you said wonky i was just saying the auto and the manual imploy the same design just different clearances.

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It's wacky, because they don't use carrier splits like the majority of differnetal manufactures do

If you mean majority by murican solid axles then sure the rest of the world makes diffs like this now.

camaro diff
http://image.gmhightechperformance.c...d-solution.jpg
toyota/lexus/subaru diff
http://i.ebayimg.com/00/s/MTE5OVg4OT..._id=8800005007
new 5.0 differential
http://speed-tech.zorly.com/pictures...solid-axle.jpg

now the gear splits
Ford 9" circa 1960
http://www.tomsbroncoparts.com/image...5/IMG_2731.JPG
nissan h233b (made until about 2003)
http://nissannut.com/projects/h233_4...l/hipinion.jpg




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Looks like a little quicker out the hole,,,don't know ️if you can post on here but you should be able to hit speed limiter closer to 7500

My stock 336 diff goes 0-limiter in 30sec,,, speedo shows 158, but I know it suppose to be 155,,,, just quits pulling @7000rpm 5th

Going to install 3.69's on my 7AT today :driving:

Hi,

Lot of people, with 7AT 370z, change the final drive (9,97% --> 47/14 to 48/13) … I am interesting but …
The 7 automatic 370z gearbox have "downshift rev matching" - DRM , it permit synchro between engine and gear box during downshift.

Does pumpkin is from a 370z, 350z, manual transmission... ?
on the pumpkin, there are 2 sensors for ABS and speed.
on 350z there are 46 teeth for ABS.
on 370z there are 48 teeth for ABS.
I don't know if thoots number needed, and is respect for 370z ABS.
the only problem can come from final drive (9,97% --> 47/14 to 48/13).

Does "downshift rev matching" function change or run or not?
any problem, impact or not ?
all is ok to 7500 rpm for change gear?
do you make ecu reflash for solve "downshift rev matching" problem ?
at how many prm, what RPM value it not run?
what happen?
any gear box problem ?
Else, all is ok..

Thanks
Best regards
Xavier

Q: Does pumpkin is from a 370z, 350z, manual transmission... ?

A: Yes Either 350/ 370 Manual diff will work, but only the 370 have the 3.69, I believe 350 = 3.55 gears

Q: on the pumpkin, there are 2 sensors for ABS and speed.
on 350z there are 46 teeth for ABS.
on 370z there are 48 teeth for ABS.

A: I would get the 370 axles as the computer is set up to read the tone rings already.

Q: Does "downshift rev matching" function change or run or not?
any problem, impact or not ?

A: No impact, continues to work. You maybe able to reset your ECU to get Cruise control to work again, I was.

HTH

I swapped a pumpkin from a 13' Sport 3.69 to an 11' base touring 3.36 & everything worked great....except the cruise would not allow you to go above 3k in 7th gear.
Unsure your mods; but be prepared to roast some tires :ugh2::ugh:

I was told that pending year model; that some had threaded stub shafts & some had threaded cv axles,,,heard a few people having to drill them out. Un-sure year model's :confused:

No need to drill them out, just get the right bolts. Mine had theaded axles, but the one I changed out had not threaded axels. Nuts & bolts solved the issue. :cool:

Hi,

Thank for anwers.
Sorry for my english...
For more information.
I have 370z 7AT limited slip EU, with (OEM 47/14) 3.357 final drive on the car. . there are cooling fin under pumpkin. No cooling fin on cover.with 48 teeth on ABS flange. I have no problem. My only problem, LSD are to much dangerous and Quaife are much more better.

I have old pumpkin 350z, 46/13 = 3.538 with Quaife (QDF13L) , 46 teeth on ABS flange. There are cooling fin under pumpkin and on cover.it is 5.4% final drive better than 7AT. with 46 teeth on ABS flange, making 4.3% less teeth than 370z. from I understand, the ECU will see 5.4/4.3= 1% wheel speed less.

EU pumpkin is littel bit different than US. It change under with cooling fin.

I don’t want to ECU flash. At first, I was not understand how EcuTek running. I was thinking to OBDII key EcuTek permit to unloock some car limits ( if the OBDII key EcuTek stay in OBD car). But, it is not, it is true ECU flash.

I need to keep outside 7AT pumpkin original aspect. With cooling fin under pumpkin. No cooling fin on cover.

i have read lot of post about to change final drive other than 3.357 on 7AT. There are some problem with Cruise control. But, for me, it means, in bad driving situation, i will not have full ABS and ESP performance. Only bad situation will permit to see a problem, but it will be to late during bad situation.
To use my Quaife will need 2 x 370z flange and cover wihtout cooling fin aspect.

I have 3 solutions. To use :
-my 350z Quaife 3.538 with 350z flanges
- my 350z Quaife 3.538 with 370z flanges
-to buy Quaife QDF18L with 370z 7AT pumpkin. with 370z flanges. The best for no problem with ABS, ESP, cruise control, "downshift rev matching" …

-my 350z Quaife 3.538 with 350z flanges
From i understand, ECU will see 5.4/4.3= 1% of difference on wheel. But i don’t know the disturbance
for ABS and ESP, cuise control and "downshift rev matching" . torque converter clutch accept arround 5% yield sliding. i think "downshift rev matching" will be full ok. But , there are difference between front wheel and rear wheel ABS, and ESP performance.
What will happen for "downshift rev matching", ABS, ESP and cuise control ?

- my 350z Quaife 3.538 with 370z flanges
What the 370z flanges will change about ABS, ESP and "downshift rev matching" , Cruise control problem performance?

- 370z 7AT ,47/14, 48 teeth ABS pumpkin with Quaife QDF18L.
All will run, but no more performance… but fully safety

i don't know if ABS, ESP, "downshift rev matching" and Cruise control will
run for perfect and will accept some yield sliding.

if you have any council... but i think, i will sale my 350z Quaife 3.538, and i will buy 370z 7AT ,47/14, 48 teeth ABS pumpkin with Quaife QDF18L...

Thanks
Xavier

xavier:
Before i swapped my RC33 (3.357) diff to the RC36 (3.692); I installed a Quaife QDF10L,,,which was the only traction device at the time for the factory 3.357 A/T diff.
It performed really well & would bite hard when tires were hot...Though i was told that if one rear wheel was lifted-the raised wheel would spin only.
The Wavetrac helical lsd is supposed to be a step above the Quaife...Just wasn't available for the 3.357 gear'd diff at the time.
I got the Nismo diff RC36 (3.692) & only removed rear cover/flushed & installed new oil & bushings.
I never counted toner ring teeth; as these work the speedometer as well as abs...all worked great. Just with cruise control on, ecu would get confused as the rpm's neared 3k & Z wasn't running 90mph (like factory)....as long as i stayed below 75 or so...cruise was fine.
rev match,up-shift,down shift was perfect & speedometer was dead on with 27" tall rear rubber.
I'll add a few pics....But performance was enhanced w/gear swap. :)

https://uploads.tapatalk-cdn.com/201...e534d5bf89.jpghttps://uploads.tapatalk-cdn.com/201...c313daa6a2.jpghttps://uploads.tapatalk-cdn.com/201...443582bfc9.jpghttps://uploads.tapatalk-cdn.com/201...98229eea26.jpghttps://uploads.tapatalk-cdn.com/201...b2aa09d11c.jpghttps://uploads.tapatalk-cdn.com/201...5cf1ed4a4c.jpghttps://uploads.tapatalk-cdn.com/201...c3c3eeb317.jpghttps://uploads.tapatalk-cdn.com/201...023b631b51.jpg
:tup:


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Be sure & install some good bushings while diff is out,,,I used Z1’s poly bushings; though others have used solid...good luck :tup:

Hi,

sorry, end of years take time, and work to much...
thanks for answered

I not doubt about motricity and to enjoy and when i will be not in dangerous situation.
In Europe it is different, law, the 370z pumpkin aspect, waranty...

It is not permit for me to take any risk, not any arouse suspicion by (first) any different visual aspect (same pumpkin and teeth needed by same visual aspect needed).
For it, the minimum for me it is to change differential axles flanges on my 350z Quaife pumpkin before to put it on 370Z. for it, any 370z cheap used pumpkin (7AT or 6MT but R200V LSD) with to obtain axles flanges will be enought.

... a QDF-18L Quaife in perfect same new 7AT pumpkin, with 3.357 same terminal drive, will be perfect for no any issue and risk.
but i not find other fully same 7AT Pumpkin in Europe.


but, from my 350z pumkin, with Quaife, with 3.538 terminal drive (I understand about 5% difference, it is not a lot) .
with add 370z axle flanges (Differential Output Shaft Stub Axle) with numbers teeth needed... visual outside aspect will be fully same ok.
will it solve fully some thing from ABS risk, or ESP, or Cruise control...?
what it will solve and not solve?
ABS?
ESP?
Cruise control?

Thank
Best regards

I’m unsure about using stub shafts with different amount of toner ring teeth?
As the dual sensors that mount in rear cover read them & unsure what would happen...others may know. I installed a Quaife in my 3.357(RC33) diff & made a big traction difference vs the open unit I removed.
The 3.69(RC36) unit had a vlsd...and worked fine for me with abs,Cruise etc...but the cruise would get confused if you accelerated above highest cruise rpm’s (3k@90mph) & the cruise light would flash until ignition was cycled.
Hope you get everything working properly :tup:

You just have to remember that before "passing" traffic to shut off the cruise control. Otherwise the cruise control will shut itself off, as jchammond says in his post. Then you have to wait until you cycle the key for the cruise to reset cruise control.

That was my solution on my highway trips using cruise and occasionally downshifting to pass or going over 100 mph.