Drivetrain Humming / Vibration coasting in 2WD but not 4WD

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blackmo92
High Range 2WD
High Range 2WD
Posts: 13
Joined: Mon Oct 16, 2017 7:21 am
Town: Melbourne
Vehicle: RZN169r
Real Name: Adam

Mon Apr 30, 2018 1:08 pm

Hi All,

I've been experiencing some humming / vibration when coasting in gear.

Most noticeable in 3rd & 4th <2000rpm, dissapears once I give it some gas or push down the clutch.

Interestingly this vibration / noise is completely nonexistent in 4WD. All fluids were changed about 3 months ago, this vibration has existed since I had the car, never thought too much of it until I drove a different manual car (this is my first) and realized you should be able to coast in gear basically until the car stops moving (obviously it would stall).

Appreciate any suggestions!

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Rigger
Low Range 4WD
Low Range 4WD
Posts: 180
Joined: Mon Dec 07, 2015 1:03 pm
Town: Oudtshoorn
Vehicle: Toyota Hilux 3.0 S/C 4x4
Real Name: Martiens

Mon Apr 30, 2018 8:51 pm

First bet would be to check the universals. Give it a good grease if they have nipples.

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Mud Dog
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Joined: Tue Apr 29, 2008 2:18 am
Town: East London
Vehicle: '90 SFA Hilux DC 4X4, Full OME, 110mm lift. Brospeed branch, 50mm ss freeflow exhaust. 30 x 9.5 Discoverer S/T's on Viper mags. L/R tank. (AWOL) '98 LTD 2.4 SFA, dual battery system. Dobinson suspension, LR tanks, 31" BF mud's.
Real Name: Andy
Club VHF Licence: HC103

Tue May 01, 2018 12:21 am

And check the centre carrier bearing on the rear drive-shaft for excessive play. It has a rubber carrier ring that allows a little play, but no more than 5mm each way would still be acceptable and even then it should feel like fairly firm movement (not sloppy). Also check the splined yoke / slip-joint for wear (side-way play) - greasing it helps as well (there is a grease nipple for that as well).
When your road comes to an end ...... you need a HILUX!.

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Life is like a jar of Jalapeño peppers ... what you do today, might burn your ass tomorrow.
Don't take life too seriously ..... no-one gets out alive.
It's not about waiting for storms to pass. It's about learning to dance in the rain.
And be yourself ..... everyone else is taken!

blackmo92
High Range 2WD
High Range 2WD
Posts: 13
Joined: Mon Oct 16, 2017 7:21 am
Town: Melbourne
Vehicle: RZN169r
Real Name: Adam

Wed May 09, 2018 1:16 pm

Apologies for the slow response, I got under the car and inspected the uni's (all seemed fine!) however I was unable to great the rear uni joint, it just wouldn't accept any grease. I sprayed it with some WD40 and poked a small screwdriver though the nipple to see if it was blocked which it wasn't. In the end I got frustrated with all the grease getting on me and gave up :oops:

There does seem to be a bit of play on the rear tailshaft, but its probably less than 5mm? I have tried to film with one hand (poorly) but you can see the play at about the :20 second mark.
https://www.youtube.com/watch?v=w0-KaHB8OvA

What exactly occurs when switching to 4H vs. 2WD, does the front diff / driveshaft only spin when 4WD is engaged?

I've looked at the effort involved in replacing uni's and it doesn't seem too difficult, in the meantime would there be any issue driving in 4H with front hubs unlocked other than extra fuel consumption?

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Mud Dog
Moderator
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Posts: 28629
Joined: Tue Apr 29, 2008 2:18 am
Town: East London
Vehicle: '90 SFA Hilux DC 4X4, Full OME, 110mm lift. Brospeed branch, 50mm ss freeflow exhaust. 30 x 9.5 Discoverer S/T's on Viper mags. L/R tank. (AWOL) '98 LTD 2.4 SFA, dual battery system. Dobinson suspension, LR tanks, 31" BF mud's.
Real Name: Andy
Club VHF Licence: HC103

Wed May 09, 2018 2:11 pm

Can't really see if there is play on that video clip. The play that you felt, is it on the centre carrier bearing or on the slip-joint?

You can drive in 4WD with the front hubs unlocked without causing any damage, but I wouldn't do that for too long a period - just until you can get to the bottom of the problem should be OK.
When your road comes to an end ...... you need a HILUX!.

Image
Image

Life is like a jar of Jalapeño peppers ... what you do today, might burn your ass tomorrow.
Don't take life too seriously ..... no-one gets out alive.
It's not about waiting for storms to pass. It's about learning to dance in the rain.
And be yourself ..... everyone else is taken!

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