Nissan Frontier D40. Manual - part 1040

TM-58

< PREPARATION >

[6MT: FS6R31A]

PREPARATION

Puller

• Removing reverse synchronizer hub as-

sembly

• Removing reverse counter gear
• Removing reverse main gear

Drift

Removing counter end bearing
a: 32 mm (1.26 in) dia.

Tool name

Description

NT077

LCIA0362E

NOISE, VIBRATION AND HARSHNESS (NVH) TROUBLESHOOTING

TM-59

< SYMPTOM DIAGNOSIS >

[6MT: FS6R31A]

C

E

F

G

H

I

J

K

L

M

A

B

TM

N

O

P

SYMPTOM DIAGNOSIS

NOISE, VIBRATION AND HARSHNESS (NVH) TROUBLESHOOTING

NVH Troubleshooting Chart

INFOID:0000000005273961

Use the chart below to help you find the cause of the symptom. The numbers indicate the order of the inspec-
tion. If necessary, repair or replace these parts.

Reference page

TM-6

2

TM-7

3

TM-6

6

TM-6

6

TM-1

04

SUSPECTED PARTS
(Possible cause)

OIL (Oi

l l

e

v

e

l 

is

 lo

w

.)

OIL (W

ro

ng

 oi

l.)

OIL (Oi

l l

e

v

e

l 

is

 hi

gh

.)

GASKET (Damaged)

OI

L

 SEAL

 (W

orn

 o

r 

da

ma

ge

d)

SHIFT CO

NTRO

L LINKAGE (W

orn)

CHECK PLUG

 R

E

TURN SPRING AND CHECK 

BALL (W

orn or damaged)

SHIFT

 FORK (W

orn

)

GEAR (W

orn

 or 

da

ma

ge

d)

BEARING (W

orn or damaged)

BAULK

 RING (W

orn

 or 

dam

a

g

e

d

)

INSER

T SPRING (Damaged)

Symptoms

Noise

1

2

3

3

Oil  leakage

3

1

2

2

Hard to shift or will not shift

1

1

2

2

2

Jumps  out  of  gear

1

1

2

2

TM-60

< SYMPTOM DIAGNOSIS >

[6MT: FS6R31A]

DESCRIPTION

DESCRIPTION

Cross-Sectional View

INFOID:0000000005273962

DOUBLE-CONE SYNCHRONIZER

1.

Mainshaft

2.

Reverse synchronizer hub

3.

Reverse coupling sleeve

4.

Reverse main gear

5.

4th main gear

6.

3rd main gear

7.

1st main gear

8.

1st-2nd coupling sleeve

9.

1st-2nd synchronizer hub

10. 2nd main gear

11.

6th main gear

12. 5th-6th coupling sleeve

13. 5th-6th synchronizer hub

14. Main drive gear 

15. Front cover

16. Transmission case

17. Counter gear

18. Filler plug

19. 3rd counter gear

20. 3rd-4th synchronizer hub

21. 3rd-4th coupling sleeve

22. Drain plug

23. Adapter plate

24. 4th counter gear

25. Reverse idler gear

26. Reverse idler shaft

27. Reverse counter gear

28. OD gear case

29. Rear extension 

PCIB1297E

DESCRIPTION

TM-61

< SYMPTOM DIAGNOSIS >

[6MT: FS6R31A]

C

E

F

G

H

I

J

K

L

M

A

B

TM

N

O

P

The 1st, 3rd and 4th gears are equipped with a double-cone synchronizer to reduce the operating force of the
shift lever.

TRIPLE-CONE SYNCHRONIZER 

The 2nd gear is equipped with a triple-cone synchronizer to reduce the operating force of the shift lever.

PCIB0594E