Originally Posted by KyleB

Impossible. 6HP26 is only for V8 powered cars. It will not bolt up to an M54 block, which if you have an '04 or '05 525i or 530i, you have an M54 powered car.

Originally Posted by m5-fan

I have a 550i with 6HP26. The transmission fault 4F89 sometimes 4F83. The sometimes symptom are:
When using normal D shift: when it at 40-50km/hour, the engine is at about 1200rpm and when try to speed up, the transmission is trying to kick down the shift and the fault generated at that time.

When I drive at DS or Sport mode, this symptom has less chance to happen. There is not fault generated in the above situation but, when it has a long uphill, the transmission seems lazy to click down the shift. Sometimes even when I change to manual shift mode, it does change gear when to shift down.

My question: I want to buy rebuilt Valve Body and all the necessary sleeve and seals to replace. Would it solve my problem? Is there anyway to determine if other part of the transmission is still healthy?

Thanks you so much

Originally Posted by tivinps

I had the same symptoms in my 545. In my case the problem was cause by worn-out seals in the tranny. I did a full overhaul of the tranny and replace the valve body with a rebuild unit.

Originally Posted by gil_g

I thought so as well, at first. However this is a 2004 model, and the transmission that's currently in it is a 6HP26. So I went with what was there.

Originally Posted by Ken Howorth

Kylie, do you know what this maybe on 2004 bmw 530i e60 with zf6hp19z