LS - 1st and 2nd Gen (1990-2000) Discussion topics related to the 1990 - 2000 Lexus LS400

Need help. Differential dilemma.

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Old 03-24-16, 08:59 AM
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Oceanic
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Default Need help. Differential dilemma.

My current differential went a few days ago so I ordered one off eBay listed as 90-94 it showed up and its not the same dif as the one on my 92, it has 4 mounting points versus the 3 I have and 4 bolts that connect it to the driveshaft versus the 3 on mine. Is this how all 1990 ls400 dif are or did they send me the wrong one? Is it possible to swap the input shafts from mine and use it on the one they sent me?
Old 03-24-16, 10:20 AM
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billydpowe
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you need to be talking with ebay, not CL unless you ordered it wrong .. SEE not as listed.
Old 03-24-16, 12:56 PM
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afaik 89-97 have 1 ear 3 point diffs, '98-00 and all SC400/300 and jza80 supra have 2 ear 3 or 4 point diffs that are interchangeable with minor modifications.

Your seller screwed up.
Old 03-24-16, 01:07 PM
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damon
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Mind if I ask your symptoms Oceanic as to what made you buy a replacement??

Scared that I might be there!!
Old 03-24-16, 03:03 PM
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Oceanic
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Originally Posted by PureDrifter
afaik 89-97 have 1 ear 3 point diffs, '98-00 and all SC400/300 and jza80 supra have 2 ear 3 or 4 point diffs that are interchangeable with minor modifications.

Your seller screwed up.
What part would this be then? They refunded me the price and shipping and then told me I can keep it. It was listed as Re: I have a question about using my item or I want to send the seller a message: 90 91 92 93 94 LEXUS LS400 REAR CARRIER ASSEMBLY 61337 #350669102611
And looks like



What would this be? Or how would I find out?
Old 03-24-16, 03:15 PM
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Oceanic
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Originally Posted by damon
Mind if I ask your symptoms Oceanic as to what made you buy a replacement??

Scared that I might be there!!
Bought it and noticed that the gasket needed to be replaced and there was an intermittet clunking noise from the rear end which i thought was a u-joint, figured I could make it last a bit if I changed the gear oil often, before I could get it home it clunked a few times then the gears snagged and sheared the teeth which left me with no power getting to the wheels and I had to call AAA
Old 03-24-16, 05:15 PM
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PureDrifter
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If I was to guess it came out of a similar year GS300/SC3(4)00 but no way to know without having it in front of me.
Old 03-24-16, 10:37 PM
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dicer
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That is one part that should last for a couple of million miles, unless it was hot rodded.
Old 03-25-16, 03:24 AM
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based on what? Differntial gears are wear items, they do wear even when properly maintained.

Given that the diff fluid is supposed to be replaced periodically and the sels are wear items as well, occasional (albeit not pattern) diff failure is not unusual.
Old 03-25-16, 08:53 AM
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My 95's diff is on its way out. At 134k. Started hearing clunks at 120.

Fluid has never been changed though.
Old 03-25-16, 02:18 PM
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Unless improperly set up, and run with the wrong lube they last a very long time. I had a job for 10 plus years working on class 8 trucks and industrial equipment. I never saw a gear set worn out that was properly set up and not abused. And believe me those gear sets I was around where much more highly loaded than the ones in your LS400 are. And technically the differential gears are not a wear item. Any more than the main and rod bearings in your engine can be called a WEAR item yeah they will wear when something isn't right. That is what proper lubrication is suppose to eliminate or minimize. With the correct EP lube and the correct heat treat the wear of hypoid gears is pretty much nonexistent. I'd like to know how many times that million mile LS had its differential changed. And how many miles on this 92 that has a bad diff? My 90 with about 300K has zero dif problems, and the oil came out looking like new. The thing that will kill the ring and pinion long before wear is metal fatigue, cracking and flaking of the surfaces.

Last edited by dicer; 03-25-16 at 02:24 PM.
Old 03-25-16, 05:36 PM
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Originally Posted by dicer
Unless improperly set up, and run with the wrong lube they last a very long time. I had a job for 10 plus years working on class 8 trucks and industrial equipment. I never saw a gear set worn out that was properly set up and not abused. And believe me those gear sets I was around where much more highly loaded than the ones in your LS400 are. And technically the differential gears are not a wear item. Any more than the main and rod bearings in your engine can be called a WEAR item yeah they will wear when something isn't right. That is what proper lubrication is suppose to eliminate or minimize. With the correct EP lube and the correct heat treat the wear of hypoid gears is pretty much nonexistent. I'd like to know how many times that million mile LS had its differential changed. And how many miles on this 92 that has a bad diff? My 90 with about 300K has zero dif problems, and the oil came out looking like new. The thing that will kill the ring and pinion long before wear is metal fatigue, cracking and flaking of the surfaces.
I spend a lot of time on the Hyundai board and the santa fe's are known to have their transfer cases go bad from time to time. Almost always, it's because of a slow leak and dies a death of oil starvation. People just don't check them, and interestingly enough, Hyundai didn't check it in their 400 point inspection. I know because I had an inspection done while having a timing belt changed, came home and looked through their checkpoint inspection(transfer case was not on their detailed sheet). The next day I drained it and it had half the fluid it was speced for.
Old 03-25-16, 11:41 PM
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Just do a million mile search on youtube, there are a lot of cars and trucks that do it. Oh and transmissions and differentials are not being fixed to do it. Tires and brakes are the wear items on these vehicles. So how many miles on this Ls with the ruined diff?
Old 03-27-16, 04:09 PM
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you two are using up space for nothing, Oceanic is already gone
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