Nissan Frontier D22. Instruction — part 925

TF-6

NOISE, VIBRATION, AND HARSHNESS (NVH) TROUBLESHOOTING

Difficult to shift from 2H
into 4H and/or clunk noise
when the vehicle is
moving.

When engaging 4H, the 2-4 cou-
pling sleeve has resistance when
engaging the clutch gear. This
resistance is caused by rotating
parts attempting to bring station-
ary parts (parts that are not mov-
ing) "up to speed" (transfer case
chain, front propshaft and differ-
ential).

If difficulty in shifting/clunk noise is gone when the vehicle is stationary
(not moving), inform the customer this is a normal characteristic of the
transfer case.

If shifting to 4H is normally louder the faster the vehicle is moving;
CAUTION: never attempt shifting to 4H above 25 mph (50 mph for
Pathfinder).

If difficulty in shifting/clunk noise can be duplicated when the vehicle is
stopped, refer to

TF-5, "NVH Troubleshooting Chart"

"Whine" noise while driv-
ing in 4H on dry, hard sur-
face (i.e. dry paved road).

Additional torque is applied to the
transfer case components.

This is a normal characteristic when there is more than usual torque
applied to the transfer case.

When the vehicle is driven in 4H on a dry hard surface, above normal
torque is applied to the mainshaft, front driveshaft, and transfer case
chain. With this extra torque, the transfer case chain will have a
"whine" noise.

Instruct the customer not to drive the vehicle in 4H on a dry, hard sur-
face.

"Clunk" noise, seems to
come from the transfer
case.

Excessive friction of the prop
shaft u-joint (transfer case end),
causing the prop shaft sleeve
yoke to stick against the transfer
case output shaft.

Inspect the rear prop shaft u-joint (transfer case end) to determine if
there is excessive friction of the u-joint (u-joint feels "notchy").

Refer to

PR-3, "NVH Troubleshooting Chart"

"Grind" noise when slowly
shifting the transfer case
from 4H to the Neutral
and then into 4L, or from
4L to Neutral and then
into 4H.

Gear clashing occurs as the Low/
High (L/H) coupling sleeve
"engages" the main or low gear.

This is a normal characteristic of the transfer case due to all of the
gears "spooling up" in Neutral.

Instruct the customer to depress the transfer case lever, and then
quickly and smoothly shift from 4H to 4L or 4L to 4H, without stopping
in Neutral.

"Ratcheting" noise from
the front hub.

One of the automatic hubs may
be stuck in the "Lock" position,
causing the other hub to make a
"ratcheting" noise.

Determine which hub is "ratcheting" and inspect the opposite hub for
possible damage. Check to see if it is unlocking. The ratcheting hub is
likely okay.

To check Automatic Hub operation, place the vehicle on a lift with the
transfer case in 2H (engine off).

●

Hand turn the front propshaft to observe both wheels "lock-in".

●

Reversing direction of the propshaft should first "un-lock" the
wheels and then "lock" them again.

●

This action should repeat each time the propshaft is reversed.

Refer to

FFD-5, "NVH Troubleshooting Chart"

, and

RAX-5, "NVH

Troubleshooting Chart"