Auto Gearbox Help Rs4 No Top Gear

[wildrat]

Was going up motorway when auto box would not change into top any more had to carry on until exit at 50-60 MPH 6000rpm and head gasket went?

Have just rebuilt top end with new s/s manifold and gas flowed engine fine now.

But still will not go into top at all

Did have issue with change into high as needed to rev to nearly red line to get to change but will not at all now

Thought was Speedo converter I had fitted to change to Mph but removed and fault still there

1st and 2nd fine OD fine the mode switch doesn’t seem to make any change

Fluid seems OK but I got two gallons to change it.

Has any one had any issues like this and found a cure

Have the R33 engine manual Etc. but says there is an error code via the mode light on dash (flash codes) if fault detected none shown.

So believe hardware rather than ECU?

Switch on gearbox not knowing needs to be in D?

If any one can help / information would be very grateful

Also would a shift kit help if so is there an email for MV automatics??

[wildrat]

Update just tried self-diagnosis and cannot see any difference in the flash rate seem same speed fast ??

I did plug laptop in with software no error codes ??

Will have to take to shop I suppose for full consult test

[Terminal]

I've heard of this happening on other Auto cars. It sounds like the overdrive clutch has packed it in to me. get an auto transmission mechanic to look at it.

[wildrat]

Not overdrive M8 the main gears over drive seems to be fine just makes aprox

1000 rpm drop if not in always levee on except for quick get always

Not total sure if top or second is U/S as seem to remember changing gear at 90mph ish

Have not been able to do any long runs as has gone wrong on first long trip

Only local runs before then except one when all worked fine

Then messed with Speedo to convert for import testing hear and then it went tits up a week or so later

Will only drive up to 55-60 mph as revs get to high and it will not change up