Drivetrain Questions and info regarding transmissions, clutches, etc.


Old 07-23-2010, 07:09 PM
DEMoLITIoN's Avatar
Registered User
Thread Starter
iTrader: (15)
Join Date: Jan 2008
Location: North Bay 707
Posts: 1,469
Likes: 0
Received 46 Likes on 35 Posts

Hello. I wrote one up for the G guys but I think the Z guys would benefit more.

I didn't have time to take pictures but this swap should take no more than 6-8 hours. I will on the next swap I do.

This is the first revision [on going] of this wright up. I am turning this attempt at a DIY to an FAQ/ info thread. I will make a full writeup on the next swap I do and link it to this thread. Most importantly, follow this at your own risk! Neither I or this forum is responsible for you "messing up your car". now that all the formalities are out the way its time to get this baby started!!

Parts list:

Clutch Pedal - OEM
Clutch Master Cylinder - OEM, OE Replacement
Clutch Piping - OEM, Aftermarket Repalcement (It will bolt up straight to the slave)
Clutch Line - OEM, Aftermarket Replacement
Clutch Slave Cylinder - OEM, OE Replacement

Drive Train:
6MT Clutch Kit: OEM, Aftermarket Performance
-Pressure Plate
-Pressure Plate Bolts
-Clutch Disk
-Throwout Bearing **Will
-Pilot Bushing
-Alignment Tool
6MT Flywheel - OEM, Aftermarket Performance
6MT Flywheel Bolts - OEM
6MT Transmission - OEM
6MT Shifter - OEM, Aftermarket Performance
6MT Rubber Grommet w/bracket - OEM from any MT Nissan.
6MT Drive-line - OEM, Aftermarket Performance
6MT Differential - OEM, 5AT Works

6MT Brake Pedal - OEM, Cut 5AT Pedal
6MT Center Console - OEM
6MT Shifter Trim - OEM
6MT E-Brake Setup - OEM, Hydraulic with line lock.
6MT Shift **** - OEM, Aftermarket Performance

6MT ECU - OEM, Reflash 5AT to 6MT with tuning software, 5AT works fine.
6MT EFI Harness - OEM, Cut and Wire 5AT (simple)
6MT Hazard Light Switch (03-04 G35) - OEM

*Be sure you have all of this before you get started*

What Items don't I have to source?
You do not need the following for your car to run/drive:
-6MT EFI Harness - 5AT works fine you just have to do some simple wiring
-6MT ECU - You can use the 5AT one just fine or flash it to 6MT with tuning software.
-6MT Ebrake -
-6MT Differential - 5AT works fine and gets great gas mileage. Just has longer gears.
-6MT Gauge Cluster - 5AT works fine, you will just have some lights on.
How easy is this to do?
If you can change a clutch, you can do a 6mt swap.
What custom work needs to be done? (what doesn't bolt in 100% OEM)
The only custom work would be the clutch pedal and making a cut for the shifter.
What is the price for this? If you DIY
The price varies depending on new/used price on the parts listed above.
-I have had good luck finding cheap used parts. The cheapest this has been done for is about $700 (free transmission and interior pieces)


You will need to do a bit of wiring for this swap. Specifically the Starting System. Reverse lights and Neutral Position Switch will not need to be wired up if you are using the 6MT Harness because it just plugs in.

Starting System
The 5AT Chassis Harness does not have an interlock switch for the clutch. You will need to wire Switched 12V+ directly to the IPDM (Intelligent Power Distribution Module). Now there are two ways of doing this.

Option 1:
You can bridge any Switched 12V+ directly to Terminal 53 (Grey/Red Stripe Wire) on the IPDM. You will be able to start the car without depressing the clutch.
Option 2:
If you purchased a used clutch pedal, It should have come with the interlock switch. You can wire Switched 12v+ to the switch, then from the switch to Terminal 53 (Grey/Yellow Stripe Wire) on the IPDM... For that OEM Feel.

Neutral Position Switch

The neutral position switch is what controls cruise control. You will not need to wire this in if you have disabled cruise control or are running an aftermarket steering wheel setup.

You will need to wire Pin 102 on the ECU(Green/Orange Stripe) to either spade on the Neutral Position Sensor. The other spade will then need to be grounded to any part of the chassis.

Transmission Removal
First things first. Lets get that trans out.

1) get the car up on jack stands or a lift. the higher the better.
2) remove catalytic converters, y pipe and O2 sensors.
3) drain the oil from the pan

4) remove the driveshaft at the differential and remove the carrier bearing. the driveshaft can then be pulled out.

5) undo transmission mount bold and the transmission will drop into the crossmember

6) unhook all sensors, remove gear selector, transmission cooler hardlines, transmission fluid fill drain.

7) Remove all the bolts from the bellhousing. unhook the starter and set it aside. now unhook the transmission from the chassis by removing the 4 crossmember bolts.

8) you will now be able to pull the transmission out. be careful because this will drain all of the trans fluid that was in the torque converter. make sure you have a large bucket to drain it in.

9)remove the giant brace that sandwiches part of the lower compression arm thing.
10) you will now be able to remove your torque converter. You just need to get your wrench behind the lip on the block. once the torque converter is out, you can remove the flywheel. It will look like this once completed.

Interior Removal: Center Console

1) Put the shifter in neutral and remove the AT Shift ****.

2)Remove the shifter bezel. It just snaps out of place You will need to disconnect the Seat warmers, Ashtray lights, and hazard Swtich.

3)Remove the rest of the center console by removing the 4 screws. Two under the radio and the other two on the sides.

4)Disconnect the park cable that releases the key. you might find some treasure in between the seats.

5)Now remove the AT shifter assembly by removing the 4 10mm bolts and disconnecting the harness.

6)you will be left this this

pry it off with a flat head and it comes right off.

Interior Removal: Seat and Clutch Pedal Prep.
1) Remove the 4 bolt covers and the bolts that hold down the seat. Be sure to unplug the 3 plugs under the seat.

2) Remove kick panel by undoing the bolt in the back and pulling towards the passenger side. Undo the weather stripping and the 'thing' that holds it in. Also take off the cover for the bottom of the dash. Be sure to unplug the interior temp sensor, trunk switch, dimmer, and vdc switch as well as the hood release.

3) get down in there and remove the ebrake assembly. It is being held in by 4 bolts. The top two will require a wrench. ratcheting wrench is a lifesaver. Follow the ebrake cable under the dash and undo it, you won't be needing it.

4) Time to remove the VDC/ABS/TCS. It is held up by 4 bolts. Drop it then easily unplug it. (You will need to plug this back in later)

5) Now you can remove the brake pedal. If you are not replacing the pedal, just cut it in half.

6)peel pack the carpet and cut the insulation to reveal the bracket that holds in the ebrake. get a spot weld drill bit and remove the bracket.

Last edited by DEMoLITIoN; 08-15-2012 at 04:12 PM.
The following 3 users liked this post by DEMoLITIoN:
NepTuneZ (07-03-2015), Sparda1123 (05-15-2012), Urbanengineer (07-18-2018)
Old 07-23-2010, 07:11 PM
DEMoLITIoN's Avatar
Registered User
Thread Starter
iTrader: (15)
Join Date: Jan 2008
Location: North Bay 707
Posts: 1,469
Likes: 0
Received 46 Likes on 35 Posts
Transmission Install. (sorry for the lack of pics)

**You must index the flywheel properly, the car won't start or run correctly if the flywheel is installed wrong**

Please view for detailed guide on how to index the flywheel.

1) Set the Engine at TDC
2) Install Flywheel in correct position and torque flywheel bolts to appropriate torque

3) Some cranks will not require a pilot bushing - Install if needed
4) Install the clutch using the clutch alignment tool. TQ bolts to appropriate torque.
5) Install Throw-out bearing into clutch bearing sleeve. Make sure everything is good. If you have a 2003-early 04 transmission it is a good time to upgrade the clutch fork and pivot ball to 04-05+
6) Before the transmission goes in, you must modify the transmission cross-member (only if you are using the AT cross-member.)
You must cut our the bracket that is welded inside the cross-member.
7) install transmission and thread in the cross-member bolt also start threading the bell housing bolts. AT bellhousing bolts will work on MT.

8) now that the bracket is cut out, it allows the bolt to go in through the transmission mount

9)Find a nut that will screw in to the transmission mount bolt. Since we are reusing the AT cross-member, Nissan didn't weld a nut to the other side.

10) time for some cutting

11) You can use your imagination on this one, but be sure you have enough room for the shifter to move freely. I just used tin snips and cut a notch.

Here is a clearer pick of the crossmember. As you can see, the bolt goes through the part that says "MT" you can see the AT nut welded to the crossmember.

Originally Posted by abushong504 View Post

We just cut out a bit of it and replaced a a spot with part of the tranny tunnel from the 6speed.

We didn't weld or anything, but just used epoxy and self-tapping screws.


Plumbing and Wiring
1) Install Clutch Slave Cylinder - very simple, very straight forward. Just make sure the rod is pushing against the clutch fork.

2) You can choose to use the OEM hard line or you can make a heat resistant, teflon coated (can handle 5000* F), 304 SS braided line. Follow OEM routing for OEM line and Drill a hold through the secondary firewall for the SS line.

Last edited by DEMoLITIoN; 07-18-2012 at 12:36 PM.
The following 2 users liked this post by DEMoLITIoN:
Sparda1123 (05-15-2012), Urbanengineer (07-19-2018)
Old 07-23-2010, 07:11 PM
DEMoLITIoN's Avatar
Registered User
Thread Starter
iTrader: (15)
Join Date: Jan 2008
Location: North Bay 707
Posts: 1,469
Likes: 0
Received 46 Likes on 35 Posts


Last edited by DEMoLITIoN; 07-18-2012 at 12:45 PM.
Old 07-23-2010, 07:12 PM
CandlestickPark's Avatar
ill Sedan

iTrader: (87)
Join Date: Jun 2007
Location: Long Beach, SoCal
Posts: 23,261
Received 2,676 Likes on 1,443 Posts
Cool looking forward to see the progress, take lots of pics. Is this Sedan a member here?
Old 07-23-2010, 07:15 PM
DEMoLITIoN's Avatar
Registered User
Thread Starter
iTrader: (15)
Join Date: Jan 2008
Location: North Bay 707
Posts: 1,469
Likes: 0
Received 46 Likes on 35 Posts
Not a member... yet. He purchased the car new in 05 and does not want to trade it in for a 6mt so we are swapping it over.
Old 07-23-2010, 07:20 PM
Registered User
iTrader: (77)
Join Date: Jun 2005
Posts: 3,058
Received 0 Likes on 0 Posts
u will also need the 6spd drive shaft as the auto wont work.
Old 07-26-2010, 11:13 PM
Registered User
iTrader: (1)
Join Date: Apr 2010
Posts: 42
Likes: 0
Received 0 Likes on 0 Posts
this will become a nice option for 5at guys

this became very easy as the years went by in the 240sx world and more and more people did it. almost became 2nd nature for auto guys
Old 07-27-2010, 12:41 AM
Former G35driver Vendor
iTrader: (32)
Join Date: Jan 2008
Location: Vegas
Posts: 3,684
Likes: 0
Received 19 Likes on 13 Posts
Our 5AT is much better than the 240 counterpart.

Throw a Transgo with the 3.5 VLSD and its like driving a different car.
Old 07-27-2010, 08:11 AM
Registered User
iTrader: (1)
Join Date: Apr 2010
Posts: 42
Likes: 0
Received 0 Likes on 0 Posts
i totally agree. i knew our auto could hold up to power so it worked out since i wanted an auto. it will just be nice to have another option out there as parts become easier to get
Old 07-27-2010, 04:25 PM
Registered User
iTrader: (4)
Join Date: Oct 2004
Location: NC
Posts: 2,173
Received 32 Likes on 26 Posts
+1. The 5AT rocks, esp. for FI up to 600 whp. If this was DIY to swap to something like a GTR transmission, OS Giken, or Quaife sequential, then that would be something!
Old 07-30-2010, 07:19 PM
DEMoLITIoN's Avatar
Registered User
Thread Starter
iTrader: (15)
Join Date: Jan 2008
Location: North Bay 707
Posts: 1,469
Likes: 0
Received 46 Likes on 35 Posts
Clutch pedal came in. Now its time to buy an OEM Clutch Master and replace the brake Pedal.
Old 07-31-2010, 02:08 PM
Canadian's Avatar
Canada, eh?
iTrader: (21)
Join Date: Oct 2005
Location: Las Vegas, NV
Posts: 4,275
Likes: 0
Received 13 Likes on 10 Posts
Good luck...this is not for the faint of heart
Old 07-31-2010, 09:05 PM
Former G35driver Vendor
iTrader: (32)
Join Date: Jan 2008
Location: Vegas
Posts: 3,684
Likes: 0
Received 19 Likes on 13 Posts
Jordan, why did you have so many problems with the 5AT? Seems like others have been fine.
Old 08-19-2010, 05:12 PM
Registered User
Join Date: Sep 2009
Posts: 432
Received 4 Likes on 4 Posts
ok looking at that list im considering just rebuilding my transmission that doing a swap......anybody know an estimate to rebuild??? or is it better to just buy a used 1??? 2003 sedan 5at with a dragging transmission as of today!
Old 08-19-2010, 05:48 PM
Registered User
iTrader: (4)
Join Date: Jan 2010
Location: Tenn
Posts: 129
Likes: 0
Received 0 Likes on 0 Posts
lol, woulda just been easier to buy a manual powered g35 in the first place but will be nice for people who wanna convert

Thread Tools
Search this Thread
Rate This Thread
Rate This Thread:
You have already rated this thread Rating: Thread Rating: 4 votes, 4.75 average.

Quick Reply: DIY: 5AT to 6MT SWAP.

Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to and affiliated sites.
  • Ask a Question
    Get answers from community experts
Question Title:
Your question will be posted in: