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The mkiv Supra Owners Club

Diff problems


Alex_GT

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I had the oil changed a week ago in my diff to see if it would cure the traction issues I have been having, but no luck as of yet. Even under low acceleration, if the car is not straight one of the wheels will spin (although it has never activated the slip control strangely). If I am turning left or right at a junction, it's almost impossible to pull away from standing without one of the wheels spinning; it is always the wheel on the inside of the turn.

 

It has done this ever since I have owned it, is this normal? Even when very slowly pulling away I can feel and hear the tyre losing traction on the road.

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I had the oil changed a week ago in my diff to see if it would cure the traction issues I have been having, but no luck as of yet. Even under low acceleration, if the car is not straight one of the wheels will spin (although it has never activated the slip control strangely). If I am turning left or right at a junction, it's almost impossible to pull away from standing without one of the wheels spinning; it is always the wheel on the inside of the turn.

 

It has done this ever since I have owned it, is this normal? Even when very slowly pulling away I can feel and hear the tyre losing traction on the road.

 

Trd or welded diff?

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If it's a lsd then if you park on a road and bit of grass then give it some beans both wheels will spin. If it's open/broken then one whe'll on the grass will Spin. That's how I would do a quick test but try to be as safe doing it. Or doing the same under heavy throttle in the road strsight both wheels will spin if it's lsd if it's open then one will spin.

 

If the diff is welded then turning at low speeds in a tight circle you may get wheel hop on one of the wheels.

 

Other than that opening up the diff your self would tell you what you've got.

 

But as above tyre conditions whether condition and how much throttle etc all contributes.

 

If it's lsd then no I would say it's not normal. But sounds like a welded diff.

Edited by Hitbox Junkie (see edit history)
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I had the oil changed a week ago in my diff to see if it would cure the traction issues I have been having, but no luck as of yet. Even under low acceleration, if the car is not straight one of the wheels will spin (although it has never activated the slip control strangely). If I am turning left or right at a junction, it's almost impossible to pull away from standing without one of the wheels spinning; it is always the wheel on the inside of the turn.

 

It has done this ever since I have owned it, is this normal? Even when very slowly pulling away I can feel and hear the tyre losing traction on the road.

 

 

A welded diff or seized planetary gears in a diff will do that. Around corners the outside wheel has to turn faster than the inside wheel. A welded or seized diff will cause one tyre to scrabble to attain the same RPM as the other.

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The code on the plate is A02A, but when I took it to the Toyota dealer for an MOT they said it is an LSD unit that is fitted.

 

IMO it sounds as though it's per the vin and is an open diff, loads of people think all tt's had a LSD, maybe whoever at Toyota was not as knowledgable as they thought?

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Well I assumed they had the car on the lift and looked at it, I asked them to look at this issue at the same time as the MOT. I have been trying to get an A02B diff so I could swap it and have a look at the one that is currently fitted so the car wouldn't be off the road (I need it for work), but there seems to be hardly any about, and aftermarket LSD's seem to be really expensive.:(

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