LX470 Rear diff LSD fluid (1 Viewer)

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bobNoobie

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Hi just bought synthetic 75w90 from walmart for all diff (front , center and rear)

And I just realize that 98 lx470 US Spec comes with LSD in the rear diff (mine does not have the magic RR Rear locker switch unfortunately ). do I need a different fluid or wally world synthetic 75w90 will do for LSD rear?

thank you
 
bobNoobie said:
Hi just bought synthetic 75w90 from walmart for all diff (front , center and rear)

And I just realize that 98 lx470 US Spec comes with LSD in the rear diff (mine does not have the magic RR Rear locker switch unfortunately ). do I need a different fluid or wally world synthetic 75w90 will do for LSD rear?

thank you
Click to expand...

The LSD in the rear DOES have a different 'spec' for the lube used there. It calls for a lube with friction modifiers.

However, depending upon the mileage of your unit....the L/S might not be working very well (if at all) anyway, in which case your prime concern is to lube the gear sets and bearings.

My '99 has about 215K on it now and the L/S does still work....but you really have to romp on it (on a slick surface) to get it to kick in. The construction of the unit is quite robust....but the friction discs simply wear over the years.

LS lube rear LX470.jpg


LSD LX470b.jpg


LSD LX470c.jpg


LSD LX470e.jpg
 
You need to be using an "LS" rated gear oil for the LSD and/or Locking Diff. Otherwise, you will hear a loud grinding noise on that particular diff that has either LSD or Locking Diff. I've seen this so many times and from friends that did their own drain and fill maintenance on their diffs and ending up draining the diff oil and having to buy a new set of LSD/Diff lock specific gear oils..
 
Most gear lubes state "LS" on bottle. Better to use in all 3 gear boxes, the extra modifiers will not hurt, Lack of may. Many shop add BG LS additive.
 
If you have an abundance of non-LS fluid just buy a bottle of the LS additive, follow the directions on the bottle.
 
It's nice to see the inside of the diff. If that is correct it's a positraction/clutch style. I do not understand why the owner's manual doesn't discuss friction modifier though. Based on the lack of a mention of it I was thinking this was a torsen/trutrac/gear style LSD.
 
LateOnTheBrakes said:
It's nice to see the inside of the diff. If that is correct it's a positraction/clutch style. I do not understand why the owner's manual doesn't discuss friction modifier though. Based on the lack of a mention of it I was thinking this was a torsen/trutrac/gear style LSD.
Click to expand...



It is correct....and is a classic friction disc, plate and spring set up.

My manual DOES specify a lube with friction modifiers.

FSM's for years where the LSD was not present....obviously won't.

LSD lube.jpg
 
My truck is an 03 LX. I'm guessing I don't have an LSD because my owner's manual is identical to the photo @bentonrover put up.

What year did they ditch the LSD? I didn't notice that in the year to year changes when I was researching the truck.
 
LateOnTheBrakes said:
My truck is an 03 LX. I'm guessing I don't have an LSD because my owner's manual is identical to the photo @bentonrover put up.

What year did they ditch the LSD? I didn't notice that in the year to year changes when I was researching the truck.
Click to expand...

U.S. versions of the 100 series were equipped as follows:

98-99 Lexus LX470 had Limited Slip rear diff STANDARD
98-99 Land Cruiser had an open diff STANDARD with a locking rear diff available as an OPTION.

Year 2000 and beyond ALL have open diffs with the advent of ATRAC.
 
flintknapper said:
The LSD in the rear DOES have a different 'spec' for the lube used there. It calls for a lube with friction modifiers.

However, depending upon the mileage of your unit....the L/S might not be working very well (if at all) anyway, in which case your prime concern is to lube the gear sets and bearings.

My '99 has about 215K on it now and the L/S does still work....but you really have to romp on it (on a slick surface) to get it to kick in. The construction of the unit is quite robust....but the friction discs simply wear over the years.

View attachment 2053084

View attachment 2053086

View attachment 2053088

View attachment 2053090
Click to expand...
Fantastic reply!
I need to replace the rear diff fluid in the '99 LX - I will look for the LS gear oil!
 
OEMGUY0720 said:
You need to be using an "LS" rated gear oil for the LSD and/or Locking Diff. Otherwise, you will hear a loud grinding noise on that particular diff that has either LSD or Locking Diff. I've seen this so many times and from friends that did their own drain and fill maintenance on their diffs and ending up draining the diff oil and having to buy a new set of LSD/Diff lock specific gear oils..
Click to expand...
Wanting to avoid this! Thus checking here first...
 
flintknapper said:
It is correct....and is a classic friction disc, plate and spring set up.

My manual DOES specify a lube with friction modifiers.

FSM's for years where the LSD was not present....obviously won't.

View attachment 2054080
Click to expand...
The rear diff holds almost 2x the front diff!
 
flintknapper said:
The LSD in the rear DOES have a different 'spec' for the lube used there. It calls for a lube with friction modifiers.

However, depending upon the mileage of your unit....the L/S might not be working very well (if at all) anyway, in which case your prime concern is to lube the gear sets and bearings.

My '99 has about 215K on it now and the L/S does still work....but you really have to romp on it (on a slick surface) to get it to kick in. The construction of the unit is quite robust....but the friction discs simply wear over the years.

View attachment 2053084

View attachment 2053086

View attachment 2053088

View attachment 2053090
Click to expand...
The local ORLY carries the Castrol LS rated 80/90 - $12.49/qt.
 
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