3.9 fd on automatic
#1
Registered User
Thread Starter
Join Date: Nov 2007
Location: Newjersey
Posts: 36
Likes: 0
Received 0 Likes
on
0 Posts
3.9 fd on automatic
i know doing this envolves swaping the for the m/t pumpkin w/ 3.5s and then having the 3.9s installed; rather then trading assemblys with someone is it possible to just buy a new one from nissan? im looking to gear my 07 auto and im not really sure where to start
#2
Registered User
iTrader: (11)
Join Date: Jan 2007
Location: Pembroke Pines
Posts: 1,912
Likes: 0
Received 0 Likes
on
0 Posts
Your best bet would be to look in the classifieds. Every now and then someone is selling a full pumpkin with a 3.9FD and stock lsd or better. Someone who has a TT may even want to trade for your pumpkin.
#4
Registered User
iTrader: (4)
Classifieds or a junkyard. I bought my assembly used for $250 from a G35 6MT sedan owner who had swapped his out with another assembly that had VLSD. What I saved pretty much covered the cost of the Quaife diff I bought.
I'd recommend checking this thread out since you're in NJ.
https://my350z.com/forum/north-east/370735-feeler-on-a-lot-of-quality-parts.html
I'd recommend checking this thread out since you're in NJ.
https://my350z.com/forum/north-east/370735-feeler-on-a-lot-of-quality-parts.html
Last edited by helldorado; 07-09-2008 at 10:04 AM.
#5
Registered User
Join Date: Jun 2005
Location: Kansas City, MO
Posts: 115
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by carbonsilver07
i know doing this envolves swaping the for the m/t pumpkin w/ 3.5s and then having the 3.9s installed; rather then trading assemblys with someone is it possible to just buy a new one from nissan? im looking to gear my 07 auto and im not really sure where to start
#6
Former Sponsor
iTrader: (564)
Join Date: Feb 2003
Location: Long Island, New York
Posts: 19,266
Likes: 0
Received 5 Likes
on
5 Posts
Originally Posted by zcar_dad
Where did you hear that you had to have the manual tranny pumpkin? Performance Nissan sells the 3.7 or 3.9 gears and they have the list of items that needs to be changed - lots cheaper then the whole pumpkin. But if you must change pumpkins why not buy the G37 coupe one from infiniti as it comes with the 3.69 gears already there. All of this is from researching sites and sponsor links and making a couple of calls. Now all I need is the money to do it.
To do a 3.9 into a auto, you need a manual transmission pumpkin. This is separate and apart from the install parts that are needed (these install parts are needed no matter what transmission you have). The reason is because an automatic and manual use a different diameter ring gear, and a different differential as well.
The other option that might work (I cant say for sure as I've never done it) is to use an auto pumpkin with manual trans differential and 3.9 final drive. I don't know if the pumpkins are physically the same though so it would need to be researched more thoroughly
Last edited by Z1 Performance; 07-09-2008 at 02:22 PM.
#7
Registered User
iTrader: (4)
Originally Posted by Z1 Performance
The other option that might work (I cant say for sure as I've never done it) is to use an auto pumpkin with manual trans differential and 3.9 final drive. I don't know if the pumpkins are physically the same though so it would need to be researched more thoroughly
Takes a lot more work though as its a 100% internal rebuild, and probably not what I would recommend if you can avoid it.
https://my350z.com/forum/engine-and-drivetrain/208582-people-who-have-swapped-pumpkins-please-chime-in.html
Trending Topics
#8
Former Sponsor
iTrader: (564)
Join Date: Feb 2003
Location: Long Island, New York
Posts: 19,266
Likes: 0
Received 5 Likes
on
5 Posts
Originally Posted by helldorado
Its actually how mine was done. We had an issue because the companion flange was changed on the 04.5+ diffs so I couldn't use the 03 carrier on my 05 as a base for the rebuild. Ended up using the 05 pumpkin, flanges from the 03 and a couple other items, combined with the rebuild parts, 3.917 ring and pinion and the quaife.
Takes a lot more work though as its a 100% internal rebuild, and probably not what I would recommend if you can avoid it.
https://my350z.com/forum/showthread.php?t=208582
Takes a lot more work though as its a 100% internal rebuild, and probably not what I would recommend if you can avoid it.
https://my350z.com/forum/showthread.php?t=208582
#9
New Member
iTrader: (3)
Originally Posted by helldorado
Its actually how mine was done. We had an issue because the companion flange was changed on the 04.5+ diffs so I couldn't use the 03 carrier on my 05 as a base for the rebuild. Ended up using the 05 pumpkin, flanges from the 03 and a couple other items, combined with the rebuild parts, 3.917 ring and pinion and the quaife.
Takes a lot more work though as its a 100% internal rebuild, and probably not what I would recommend if you can avoid it.
https://my350z.com/forum/showthread.php?t=208582
Takes a lot more work though as its a 100% internal rebuild, and probably not what I would recommend if you can avoid it.
https://my350z.com/forum/showthread.php?t=208582
Interesting. I was under the impressions that the AT & MT housings were different and this wouldnt work.
good info...some STICKY THIS! I figured it wouldn't be the easiest route to go
#10
Registered User
iTrader: (4)
Originally Posted by Frostydc4
Interesting. I was under the impressions that the AT & MT housings were different and this wouldnt work.
I'm coming in close to 20k miles on my setup and it's still as smooth as the day it went in. Forget exactly how many miles I was at when I had when it was done, but it'll be 2 years in August.
#14
Registered User
Join Date: Sep 2014
Location: Waterbury ct
Posts: 28
Likes: 0
Received 0 Likes
on
0 Posts
Thread
Thread Starter
Forum
Replies
Last Post
MAsSIVrOOM
Engine & Drivetrain
2
10-20-2023 10:50 AM
seagrasser
Zs & Gs For Sale
6
10-11-2015 03:27 PM
Bodyboarder81
Forced Induction
13
09-21-2015 06:23 AM