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[JamesV6CDX]

Tonight I was driving along a dual carriageway, speedo probably somewhere up by 80. I overtook a car, using sport mode, and then pulled back into lane 1. As I pulled in, I took S mode off.

A few seconds after doing this, the light with the car and the spanner came on. As soon as I pulled away from next roundabout, it was obviously in limp mode, pulling away in top gear. (MUCH slower on the uptake than just the snow button, foot to the floor it makes loads of noise and hardly goes anywhere).

I could change through the gears manually. but when going from 1 to 2 etc there was a delay, and a thud.

I turned off the engine, restarted - light still on, same symptoms.

I then stopped the engine again, removed key, re inserted and restarted. Fault no longer there, and appeared to be starting out in first gear again.

I checked for codes - no codes in the gearbox or engine ECU stored (yes I carry a code reader in the glovebox, it's an Omega!!)

Then, upon pulling away from a standing start, admittedly quite quickly - this all happened so fast I can't explain it properly, but, at about 5,000 rpm, there were a series of THUDS as if the drive was being interrupted... it shook the whole car REALLY badly on each thud (my passenger said it hurt her). I may have imagined this, but as it happened, it felt like the back end swang around quite a lot. (I had exactly the same a few weeks ago, and put it down to a diesel patch, obviously not)

I also feel like the autobox has a bit of a vibration/rumble, when slowing down and coming to a stop...

What could have caused those thuds, and awful violent shaking of the whole car? TC, something inside the box?

Guessing in abscence of codes, check for the pesky thrust washer first?

Anyone got a spare AR35? Or even better, an R28 manual box, do the job properly for once and for all?

[cem_devecioglu]

Tonight I was driving along a dual carriageway, speedo probably somewhere up by 80. I overtook a car, using sport mode, and then pulled back into lane 1. As I pulled in, I took S mode off.

A few seconds after doing this, the light with the car and the spanner came on. As soon as I pulled away from next roundabout, it was obviously in limp mode, pulling away in top gear. (MUCH slower on the uptake than just the snow button, foot to the floor it makes loads of noise and hardly goes anywhere).

I could change through the gears manually. but when going from 1 to 2 etc there was a delay, and a thud.

I turned off the engine, restarted - light still on, same symptoms.

I then stopped the engine again, removed key, re inserted and restarted. Fault no longer there, and appeared to be starting out in first gear again.

I checked for codes - no codes in the gearbox or engine ECU stored (yes I carry a code reader in the glovebox, it's an Omega!!)

Then, upon pulling away from a standing start, admittedly quite quickly - this all happened so fast I can't explain it properly, but, at about 5,000 rpm, there were a series of THUDS as if the drive was being interrupted... it shook the whole car REALLY badly on each thud (my passenger said it hurt her). I may have imagined this, but as it happened, it felt like the back end swang around quite a lot. (I had exactly the same a few weeks ago, and put it down to a diesel patch, obviously not)

I also feel like the autobox has a bit of a vibration/rumble, when slowing down and coming to a stop...

What could have caused those thuds, and awful violent shaking of the whole car? TC, something inside the box?

Guessing in abscence of codes, check for the pesky thrust washer first?

Anyone got a spare AR35? Or even better, an R28 manual box, do the job properly for once and for all?

there is the answer imo

[serek]

Tonight I was driving along a dual carriageway, speedo probably somewhere up by 80. I overtook a car, using sport mode, and then pulled back into lane 1. As I pulled in, I took S mode off.

A few seconds after doing this, the light with the car and the spanner came on. As soon as I pulled away from next roundabout, it was obviously in limp mode, pulling away in top gear. (MUCH slower on the uptake than just the snow button, foot to the floor it makes loads of noise and hardly goes anywhere).

I could change through the gears manually. but when going from 1 to 2 etc there was a delay, and a thud.

I turned off the engine, restarted - light still on, same symptoms.

I then stopped the engine again, removed key, re inserted and restarted. Fault no longer there, and appeared to be starting out in first gear again.

I checked for codes - no codes in the gearbox or engine ECU stored (yes I carry a code reader in the glovebox, it's an Omega!!)

Then, upon pulling away from a standing start, admittedly quite quickly - this all happened so fast I can't explain it properly, but, at about 5,000 rpm, there were a series of THUDS as if the drive was being interrupted... it shook the whole car REALLY badly on each thud (my passenger said it hurt her). I may have imagined this, but as it happened, it felt like the back end swang around quite a lot. (I had exactly the same a few weeks ago, and put it down to a diesel patch, obviously not)

I also feel like the autobox has a bit of a vibration/rumble, when slowing down and coming to a stop...

What could have caused those thuds, and awful violent shaking of the whole car? TC, something inside the box?

Guessing in abscence of codes, check for the pesky thrust washer first?

Anyone got a spare AR35? Or even better, an R28 manual box, do the job properly for once and for all?

think Daz have R28 with all bits for manual conversion.
if not I have got few AR35 here

[JamesV6CDX]

Tonight I was driving along a dual carriageway, speedo probably somewhere up by 80. I overtook a car, using sport mode, and then pulled back into lane 1. As I pulled in, I took S mode off.

A few seconds after doing this, the light with the car and the spanner came on. As soon as I pulled away from next roundabout, it was obviously in limp mode, pulling away in top gear. (MUCH slower on the uptake than just the snow button, foot to the floor it makes loads of noise and hardly goes anywhere).

I could change through the gears manually. but when going from 1 to 2 etc there was a delay, and a thud.

I turned off the engine, restarted - light still on, same symptoms.

I then stopped the engine again, removed key, re inserted and restarted. Fault no longer there, and appeared to be starting out in first gear again.

I checked for codes - no codes in the gearbox or engine ECU stored (yes I carry a code reader in the glovebox, it's an Omega!!)

Then, upon pulling away from a standing start, admittedly quite quickly - this all happened so fast I can't explain it properly, but, at about 5,000 rpm, there were a series of THUDS as if the drive was being interrupted... it shook the whole car REALLY badly on each thud (my passenger said it hurt her). I may have imagined this, but as it happened, it felt like the back end swang around quite a lot. (I had exactly the same a few weeks ago, and put it down to a diesel patch, obviously not)

I also feel like the autobox has a bit of a vibration/rumble, when slowing down and coming to a stop...

What could have caused those thuds, and awful violent shaking of the whole car? TC, something inside the box?

Guessing in abscence of codes, check for the pesky thrust washer first?

Anyone got a spare AR35? Or even better, an R28 manual box, do the job properly for once and for all?

think Daz have R28 with all bits for manual conversion.
if not I have got few AR35 here

In all honesty, I'll probably keep with AR35, but fit the sonnax washers etc to it, before fitment

[YZ250]

What could have caused those thuds, and awful violent shaking of the whole car? TC, something inside the box?........................

Haven't got a whiny diff by any chance have you.    Sounds like something mis-meshing to cause that.

[JamesV6CDX]

What could have caused those thuds, and awful violent shaking of the whole car? TC, something inside the box?........................

Haven't got a whiny diff by any chance have you.    Sounds like something mis-meshing to cause that.

Nope, but the gearbox has always had a high pitched whine - only with engine ticking over, not driving. Kev wood has heard it

[Kevin Wood]

I thought the gearbox had died and been changed since the whining one?

Either way, sounds like this one isn't healthy.

Usual drill. Check fluid level and condition. If ok, drop sumps and see what you find in them.

[VXL V6]

The description of thuds followed by the back slewing round sounds more like a Diff issue to me....
 

[YZ250]

The description of thuds followed by the back slewing round sounds more like a Diff issue to me....
 

 

Hence my question above.   If it's 'kicking' the car it could be mis-mesh of crown/planet wheels in diff.    Mind you, if the car has known gearbox issues I suppose it's a good place to start. 

Regards
Alan

[JamesV6CDX]

I thought the gearbox had died and been changed since the whining one?

Either way, sounds like this one isn't healthy.

Usual drill. Check fluid level and condition. If ok, drop sumps and see what you find in them.

I did have a problem with not being able to select drive a few months ago, but this was attibuted to the selector switch

[Marks DTM Calib]

Cant see a diff issue resulting in the gearbox going into limp mode.

Sounds like something failed/failing in the autobox to me.

[2woody]

don't sound like a diff issue to me at all.

If something is worn so bad that it's come out of mesh, then it would undoubtedly bi in bits on hte floor having come through the casing. It would never rotate again.

definitely inside the transmission.

[Psychoca]

I have an R25-28 box kicking about in the garage still, I'll quite happily part with it...  pm me for more info if your interested...

[Bionic]

 
If it were mine I would not do anything other than change that gearbox for another from a reputable and tested source. The diff I would reckon is okay cos if it were that then by now the chances are that it would have stripped some teeth, and that, believe me you would know about.
Before you fit another box give it a good clean out and pay particular attention to the mesh filter. How many miles has yours done, cos its a safe bet that the oil in it is the original and by now must be past its sell by date.........
They really ought to fit drain plugs to them!
GudLuk anyway.

[Martin_1962]

I have seen 2 things cause this

1) Badly fitted LPG system - shorted out the crank sensor pickup - gearbox went into limp - it was THAT install.

2) Failed selector switch my blue 2.0 CD