Gear Whine

[ORANG50]

I finally installed my DSS CF driveshaft and MGW shifter this past weekend, and now I'm noticing the diff noise is pretty prominent above 40ish mph. Previously, I had installed the Steeda stop the hop package w/ black poly diff bushing inserts and a trans bushing insert, and noticed some increase in gear noise, but it seemed reasonable. Now, the gear noise comes on pretty strong at 45mph, especially coasting or at low load, and slowly tapers as speed increases.

Mainly wondering if something is wrong, or if its in line with what's done to the car.

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[Optimum Performance]

I finally installed my DSS CF driveshaft and MGW shifter this past weekend, and now I'm noticing the diff noise is pretty prominent above 40ish mph. Previously, I had installed the Steeda stop the hop package w/ black poly diff bushing inserts and a trans bushing insert, and noticed some increase in gear noise, but it seemed reasonable. Now, the gear noise comes on pretty strong at 45mph, especially coasting or at low load, and slowly tapers as speed increases.

Mainly wondering if something is wrong, or if its in line with what's done to the car.

Most likely whats done to the car. You have eliminated a very rubber mounted driveshaft that is two piece so technically you changed the driveline angle by eliminating two angles in the middle of the original driveshaft.
Excerpts from Manual:
Axle howl or
whine
The MT82 transmission may be
suspect of a gear whine noise,
which seems to be emanating
from the rear of the vehicle at or
in excess of 80 km/h (50 mph) at
full operating temperature. Drive
the vehicle at customer
complaint speeds in 5th gear
(this is the direct gear) to
eliminate manual transmission
as noise source, reach full
operating temperature and
confirm if noise is still present.

Transmission growling/humming — noise
occurs in the forward gears. The noise is
more prominent when the gear is loaded.
The problem gear can be located as the
noise occurs in a specific gear position
•Transmission rumble/growl — noise at
higher speeds in forward gears, more
pronounced in a coast/deceleration
condition
Incorrect
driveline angle
CHECK the driveline angle.
Driveshaft out
of balance or
damaged

 

[ORANG50]

Makes sense. Thanks for the info!

 

[ORANG50]

The manual doesn't happen to have any procedure on how to adjust the driveline angle if it's not correct, does it?

 

[IvanCRF]

The manual doesn't happen to have any procedure on how to adjust the driveline angle if it's not correct, does it?

Driveshaft Angle Measurement

Check
NOTE: This procedure does not apply to CV joints, flex couplers or double cardan joints that are used in some driveshafts.
This check is for singlecross
and rollerstyle
joints found in the driveshafts.
NOTE: Prior to checking driveline angularity, inspect the Ujoints
for correct operation.
NOTE: An incorrect driveline angle can cause a vibration or shudder.
NOTE: Driveline angularity is the angular relationship between the engine crankshaft, the driveshaft and the rear axle
pinion. Factors determining driveline angularity include ride height, rear spring and engine mounts.

1. NOTE:
Special Tool(s): Anglemaster II Driveline Inclinometer/Protractor 164R2402.
Carry out the following
preliminary setup steps:

1. Inspect the Ujoints
for correct operation.

2. Park the vehicle on a level surface such as a driveon
hoist, or back onto a front end alignment rack.

3. Verify the curb position ride height is within specifications with the vehicle unloaded and all of the tires are
inflated to their normal operating pressures.

4. Calibrate the Anglemaster II Driveline Inclinometer/Protractor by placing it on a clean, flat level section of the
frame rail and press the ALTZERO
button.

Vehicles with flatflanged,
splitpin
or slipflanged
Ujoints

2. NOTE: If equipped, remove the snap ring to allow access to the base of the Ujoint
cup. Make sure the Anglemaster
II Driveline Inclinometer/Protractor is seated against the Ujoint
cup.
NOTE: Rotate the driveshaft until the flange Ujoint
cup is parallel with the floor. This will simplify taking
measurements.
Special Tool(s): Anglemaster II Driveline Inclinometer/Protractor 164R2402.
Check and record the flange angle as
angle A

3. Special Tool(s): Anglemaster II Driveline Inclinometer/Protractor 164R2402.
Measure the slope of the connecting
component. Record the measurement of the component angle as angle B.

Multiple piece driveshafts
4. NOTE: Repeat this step for each center support bearing on the driveshaft.
NOTE: It is not necessary to remove the Ujoint
snap ring, if equipped, for these measurements.
Special Tool(s): Anglemaster II Driveline Inclinometer/Protractor 164R2402.
Measure the slope of the components in
front and behind the center support bearing Ujoint
in the area indicated. Record the front component as angle A and
the rear component as angle B.

All vehicles
5. NOTE: When 2 connected components slope in the same direction, subtract the smallest number from the larger
number to find the Ujoint
operating angle. When 2 connected components slope in the opposite direction, add the
measurements to find the Ujoint
operating angle.
Calculate the difference in the slope of the components to determine the Ujoint
operating angle.

6. NOTE:
The Ujoint
operating angle is the angle formed by 2 yokes connected by a cross and bearing kit. Ideally, the
operating angles on each connection of the driveshaft must:
1. be equal or within one degree of each other.
2. have a 3 degree maximum operating angle.
3. have at least onehalf
of one degree continuous operating angle.

7. If the angle is not within specifications, repair or adjust to obtain the correct angle. Inspect the engine mounts,
transmission mounts, center support bearing mounting, rear suspension, rear axle, rear axle mounting or the frame
for wear or damage.

 

[Dominant1]

Those black diff bushings are the hard ones right? If so put the red ones in!

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