Hey guys,

So we still have our E53 with the dodgy transmission - failed / failing bushings, it's had it, never had a fluid change in its life sadly (220k kms, that's my mum for you - she knows better now). I've had rebuild quotes come in at ridiculous money, usually around $7,000 to $8,000 AUD, which is almost what the car is worth right now anyway... so not going down that route. I've found someone local who has a ga6hp26X for sale with only 80k kms on it and at a quarter of the cost of these rebuild quotes. But my question is, on Realoem and such our E53 is listed as having the ga6hp26z - is there a difference between these two? Are they interchangeable?

I'm ready to pull the trigger on this trans, want to get it installed, do a fluid and filter change and move on from all of this. Really appreciate your insight, thanks