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1991 Land Cruiser FJ80 #5356073 02/20/20 10:57 PM
Joined: Jul 2009
Posts: 240
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CCI Offline OP
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Joined: Jul 2009
Posts: 240
Owner had rear tires worn down, front tires new, we're seeing 8 inches in 10 rotations LR and 6 inches in 10 rotations RR difference from front tires. Not good, seems to have done some driveline damage.

Put two new tires on the back same brand and size as new fronts, seems to be a lot better but center diff whines under load, front diff chatters and bumps a little turning in reverse.

Factory recommended lube is just regular old gear oil, GL-5 SAE 90.

Not looking for a miracle in a bottle, but is there any lubricant that will work better in these differentials?

Re: 1991 Land Cruiser FJ80 [Re: CCI] #5356095 02/20/20 11:40 PM
Joined: Sep 2004
Posts: 8,707
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andyd Offline
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Open diffs? Then regular ol' 80w90 is good.Different size tires are bad for diffs. maybe go thicker on TC to see if it quiets down. If the TC has a chain ,can you check it for slack? On my old Wags any deflection over 3/4" was a bad sign. grin2


'16 Camry LE STP synth 0w20 and STP filter. the Fridge

1994 Ranger ,the Rat, 5w30 dino, STP filter

'16 Camry SE, Valvoline HM 0w20 and OEM filter
Thick oil is better grin2
Re: 1991 Land Cruiser FJ80 [Re: andyd] #5356740 02/21/20 07:32 PM
Joined: Jul 2009
Posts: 240
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It's old enough that anything could have happened over the past 29 years but I think the front and rear diff are probably stock, I will check next time it's on the lift. Likely yes, open front and rear, this one has the electric (3 relays) locking center diff.

4 speed automatic transmission seems to be in pretty good shape. Shifts hard into 4th gear unless you really have your foot in it, I'm wondering if it's just a little goo around the spring behind the ball, this one has been sitting a long time.

What doesTC stand for?

Re: 1991 Land Cruiser FJ80 [Re: CCI] #5357772 02/23/20 03:00 AM
Joined: Feb 2019
Posts: 73
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RoyFJ Offline
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I use Redline 75W-110 on my diffs for the FJ Cruiser, works out real good.

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