Description

Nissan G35 Coupe 2004 Service Manual

If you are pulling the transmission on a 2004 Nissan G35 Coupe, you need the factory Service Manual. Not a third-party rewrite. Not a scanned copy missing every other spec. This is the 64-page OEM document that Nissan techs used when the car was new. I have twisted wrenches for 28 years, and I can tell you right now: the difference between a transmission that shifts smooth for another 100,000 miles and one that grinds every time you hit second gear comes down to using the correct service data. This manual has it.

Forget whatever aftermarket junk claims to cover the RS6 transmission. The factory manual gives you the exact procedures for the manual transmission in this car. Want to know the double-cone synchronizer clearance on first gear? Page 27 has the end play spec. Need the fill volume for M/T oil? It is in the M/T Oil section, not some generic table that guesses. Every step in here was validated by Nissan engineers on the assembly line.

NVH Troubleshooting Chart – Manual Transmission

Noise, vibration, and harshness problems are the hardest to diagnose when you have a customer waiting. The manual includes a dedicated troubleshooting chart for the manual transmission. You get a direct path from symptom to cause. Grinding in second? Check the triple-cone synchronizer clearance spec. Whining in neutral? Look at the input shaft bearing clearance. This is the diagnostic logic you cannot get from a parts store printout.

M/T Oil Replacement – Draining and Filling

Oil change on a G35 Coupe manual transmission is not rocket science, but it is easy to botch if you skip the steps. The manual walks you through draining, filling, and checking oil level and leakage. It specifies the exact oil type and capacity. Use the wrong fluid and you will destroy the double-cone synchronizers — I have seen it happen. The factory manual prevents that mistake because it tells you what the transmission was designed for.

Here is a tip I learned the hard way: after you fill the transmission, run the car through all gears before you button up the under-tray. The manual’s inspection after installation check (page 17 of the shift control section) includes verifying the back-up lamp switch and neutral position switch function. If you skip that, you will be pulling the shifter again next week.

Rear Oil Seal Removal and Installation

That rear oil seal tends to leak after 100k miles. The manual gives you the removal procedure and the installation steps with the correct depth for the new seal. You will need a special service tool — listed in the Preparation section — unless you want to risk damaging the housing. Commercial service tools are also listed, but I recommend using the factory SST if you do this more than once. Page 11 has the installation torque for the seal retainer bolts. Over-torque them and you crack the case. Under-torque and it leaks. The spec is there.

Transmission Assembly Disassembly and Assembly

This chapter is the core of the manual. It covers case components, gear components, and shift control components separately. You get a cross-sectional view of the double-cone synchronizer (first, third, fourth) and the triple-cone synchronizer (second). The disassembly steps are ordered so you do not drop bearings or mix up snap rings. The inspection after disassembly section covers every wear item: baulk ring clearance, end play, snap ring thickness. If you are rebuilding this transmission, you need the specifications from the SDS (Service Data and Specifications) at the back of the manual. That is where you find the exact clearance limits for the single-cone synchronizer on fifth and sixth gears.

Let me tell you about a job I saw where a guy used a generic manual on a G35 Coupe. He installed the reverse synchronizer backwards because the aftermarket drawing was mirrored. Cost him an extra weekend and a new set of gears. This factory manual has the correct orientation drawings. Manual Transmission design is not something you guess on.

Service Data and Specifications (SDS)

This section gets its own H2 because it is the reason you buy OEM. General specifications, end play for each shaft, snap ring thicknesses, and baulk ring clearance for every synchronizer. All in imperial units. No conversion needed. If you are ordering parts, you match the snap ring to the thickness spec here. The manual tells you which color code corresponds to which thickness. It saves you from ordering the wrong part.

I have worked on enough Nissan products to know that the factory manual is the only source you should trust. Automotive Industry Overview has moved toward generic repair info, but for a specific car like the 2004 G35 Coupe, nothing beats the original. And if you need other Nissan service documents, check the related manuals: Nissan Xterra 2005 Service Manual – OEM Factory Spec, Nissan 60 1967 Service Manual – Original Factory Bulletin, and Nissan L60, L60-U, KL60-U 1968 Service Manual – Factory Specs.

Do not waste your time on reprints that claim to contain OEM data but leave out half the torque values. This is the real deal — 64 pages of factory information, directly from Nissan’s 2004 service documentation. Access the Factory Manual and keep your G35 Coupe shifting right.

FAQ – Your Questions Answered

Does this manual cover the automatic transmission?

No. This manual is only for the manual transmission on the 2004 Nissan G35 Coupe. If you need the automatic transmission, you want a different document.

What torque specs are included in the SDS section?

The SDS includes end play limits for the main shaft and countershaft, snap ring thicknesses for gear positioning, and baulk ring clearance for all synchronizers (single-cone, double-cone, triple-cone, and reverse). Specific torque values for bolts like the rear oil seal retainer are listed in the removal/installation procedures.

Can I use this manual for a 2003 Infiniti G35?

The 2004 G35 Coupe shares the same manual transmission as the 2003 model. The procedures are identical. However, the manual is specifically titled for the 2004 model year. If you want absolute certainty, get the 2003 version as well.

Where do I find the special service tool numbers?

Page 3 of the Preparation chapter lists all special service tools with Nissan part numbers. These tools are required for removing the transmission assembly and installing the rear oil seal correctly.

Stop chasing after dead ends with aftermarket manuals that skip the critical specs. The 2004 Nissan G35 Coupe Service Manual is available here as a direct factory scan. Access the Factory Manual and get back to work.