Transfer Differential Fluid Change (1 Viewer)

[MtnCruiserFZJ80]

Hi there,

I just bought a 1994 Toyota FZJ80 about a month ago, and I just got around to changing the differential and transfer case fluids. Furthermore, I put Mobil 1 75W-90 in all three, and I've noticed twice now just for a few seconds a slight grinding noise as I am driving to the end of my street. I've only put about 50 miles on the new fluid. I'm pretty sure the previous fluid was Dino, and the front and t-case were definitely well due for a change. Is this slight noise normal? Should I switch back to Dino fluid? I suspect it is from the t-case. Thanks a ton and cheers.

 

[Hornd]

Video of the Noise?

 

[MtnCruiserFZJ80]

The noise/feeling is totally random and has only happened on 3-4 occasions after the 60 miles I've driven since the fluid change, lasting a few seconds. I should mention the vehicle has 235k miles on it.

 

[Mighty690]

Since you're new to the vehicle it could be something else that is causing the noise that you suspect is the transfer case. Perhaps a driveshaft? Have you lubed them?
An odd noise now and then happens on older vehicles, even one that is as legendary as the Land Cruiser.

 

[Cruiserdrew]

Seriously. The Mobil1 75w-90 is about the best lube you could run. It's not the cause.

 

[MtnCruiserFZJ80]

So after taking it around the block again, it seems there's a distinct grinding noise and as I press down on the pedal and accelerate it increases to a higher pitch. I will try to get a video of this. I have not lubricated the drive shaft, I just assumed this problem to be associated with the gear oil change since it did not happen on the previous 2.5k miles I put on it.

Additionally, the guy from advanced auto told me I should be running 80w-90 in my differentials and that could be the problem?

 

[math]

So after taking it around the block again, it seems there's a distinct grinding noise and as I press down on the pedal and accelerate it increases to a higher pitch. I will try to get a video of this. I have not lubricated the drive shaft, I just assumed this problem to be associated with the gear oil change since it did not happen on the previous 2.5k miles I put on it.

Additionally, the guy from advanced auto told me I should be running 80w-90 in my differentials and that could be the problem?

AFAIK it doesn't really matter. Toyota will put in 75w-140 if you take it to a dealership. Is that right? Who knows.

 

[MtnCruiserFZJ80]

Also, I used store bought M1 75W-90 for the front and rear differentials, but I ran out for the T-Case. So, I took two empty bottles of M1 gear oil to Toyota and the parts guy filled them with what he said was M1 75W-90 from the big barrel in the back, I shouldn't suspect he accidentally gave me the wrong weight? Nor would that even matter?

 

[jtwopark]

That advanced auto parts guy is an idiot! Tell him to clean the parking lot if he is going to give faulty advice!

 

[MtnCruiserFZJ80]

That advanced auto parts guy is an idiot! Tell him to clean the parking lot if he is going to give faulty advice!

Haha, I will let him know next time I am in...

The noise is definitely some sort of metal on metal contact, and it seems to be located around the front left of the vehicle and is prominant when I accelerate and turn left, accelerate driving straight, or accelerate while applying the brakes in D. I had recently changed the brake pads without turning the rotors, could this be a result of that, despite the grinding noise occurring without applying brakes? Or, possibly from overfilling the differential--I just checked the level and a fair amount pours out after loosening the Fill Plug? I also just topped off the T-Case with about 1/5 of a qt of M1 until it began draining steadily via the Fill Plug. Thanks for all advice and help.

I will upload a video shortly.

 

[jtwopark]

Check your knuckles, driveshaft f&r

 

[MtnCruiserFZJ80]

 

[MtnCruiserFZJ80]

Sorry for the potato quality and cutting out while recording.

 

[chap79]

Are you hearing this noise when just pressing on the accelerator? Not just when the vehicle is moving?

 

[MtnCruiserFZJ80]

Are you hearing this noise when just pressing on the accelerator? Not just when the vehicle is moving?

Yes, that is what it seems like.

 

[baldilocks]

Front left while accelerating? Remove your drive plates and inspect the axle and plate splines for evidence of slip or skipping.

 

[MtnCruiserFZJ80]

So after driving about 200 miles the noises have gone away, and it drives smoothly. Perhaps this was normal?

 

[inkpot]

You may of just loosened up old grease that was kind of settled in position. I would still lube up the driveshaft, and check the knuckles to see if you need to add some moly.

 

[SCDreamer]

Hey random question is this the stuff you guys have used?

Amazon.com: Mobil 1 104361 75W-90 Synthetic Gear Lube - 1 Quart: Automotive

I was just hesitant to try it with the LS friction modifier or what ever it has. It says ok to use in diffs without a limited slip but I've heard people saying to stay away from gear oils with additives. Thanks for you help!