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Hi. bought my gs 400 98 in february with 95k on it, now noticing some kind of a little loose in the differential when i change transmission from drive to reverse. I put the car on a lift on gave a look under : the drive shaft and the transmission look ok (but i am no expert) the only place i founded some loose is when a started rotating one rear wheel back and foward, i had to turn like one quarter of a revolution to fill it against the gear from side to side, so that why i conclude the problem is in the differential...

Is this problem ever occured to someone else, and is this problem can be fix without having to change the differential completly???

All input will be appreciated.


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“differential= rear wheel drive”

Not really differential is on all cars front wheel drive and back wheel drive the differences are on most front wheel drive the differential is built in the gear box/transmission and on back wheel drive they are a stand alone unit. :)


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I have gone back and read the start of this thread and it is clear to me now that Dantheman car is rear wheel drive. I would check the universal joints for play normally 2 on drive shaft and if the car has independent suspension on the rear then each drive axle would have a UJ as well.


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Thanks again but

the toink-toink that i hear every time i go from drive to reverse to drive is too noisy to be normal and i have also check for the universal joint, but if you check on your car (gs400 98) you will find that they are not made lilke american car or other car i have owned before. They are like 0ne inch thick, 5 inches diameter rubber disk bolted from the transmission to the drive shaft and from the drive shaft to the differential. So that is why i was suspecting the differential. (at the REAR) :whistles:

Thank again


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OK Lotus use to use them on the Elan’s “rubber donuts”

I have a 96 GS 300 and if your GS 400 rear suspension is like mine they are all kinds of linkages on there with rubber bushings that would cause that toink-toink if they brake or becomes loose, make sure that they are all in good order and bolts are tight.

Normally the dif doesn’t make that kind of noise they hum and wined.


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:lol: ^^^^^^ Uhmmm differential= rear wheel drive


is he saying that only RWD cars have differentials? Then how do FWD cars transfer power to the axels? Sheer will power? lol sorry, don't mean to be a jerk (maybe a little)...

Diff's are anything that transfers rotational power into the axels. FWD cars have the tranny up against the flywheel (manuals) or crank output shaft (auto - torque converter), then out of the tranny is the diff, which is usually geared right onto the tranny output shaft. So on cars such as the Int Type R, the diff is an LSD, but on a GSR, it's an "open diff". Then from the diff, it goes into the axels (yes, one is shorter than the other, that's why those drag civics' long axels break all the time).

and most cars DON'T have LSD's. LSD's are expensive to manuf. compared to open diff's. Think of all the cars with an LSD. The cheapest one that I could remember is a 1995 240sx SE with the LSD/ABS package for around $23,000. think about it, most cars/people don't need LSD's, how many typical drivers take 40mph right turns?

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  • 1 year later...


I'm on the verge of buying a 2002 IS300 and took it for a test drive a

couple of days ago. I noticed a muffled thunk or click when I started

from a dead stop ( at a traffic light or stop sign or whenever I

started the car from a standstill) after putting the car into 1st gear. I'm not

sure if I heard it between the higher gears.

The current owner never noticed it. I took the car in for a pre-

purchase inspection at the same auto shop that has been looking after

the car for the past 2/3 years. When I pointed it out to the mechanic

on a test drive he noticed it and first explained it as having to do

with the fact that it is a rear-wheel drive and the long travel of the

drive shaft causes this etc.

When I persisted with my questions about whether this was normal, he

kept saying that it didn't bother him and that it is expected. He

didn't seem to have ever noticed this problem on any car before. I was

surprised as he has worked on Lexus and Toyotas for 18 years and when

I mentioned this, he said that it didn't register in his mind as a

problem and so he never really noticed it.

When he put the car up on the lift, stood under it and gently rocked the

rear wheels back and forth we could see the long metal axle (?) or rod that

connects to the parts before they go on to the rear wheel had some

play and made a slight clicking noise.

From looking around on different Lexus forums and on here, I understand that

this could be due to the play in the universal joint.

I asked him if he could expect

this in a brand new IS300 and he didn't seem sure.

I am more than a little concerned as this the first car that I am

going to spend over $15000. (the asking price is $16300); concerned

enough to consider getting a second opinion if the current owner will

allow it.

Have any of you noticed or are aware of this problem or even if it is

a problem at all?

It just seems to me that a car of the quality of a Lexus should not have

click and pops like this.

I'd really appreciate any input. Thanks in advance!

The car: 2002 IS300

5 speed manual transmission

70K miles

Otherwise excellent overall condition

Current owner seems to have maintained it very well

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