e34 auto box issue, no power and not changing gear ??
I was wondering if you can help. I just picked up a e34 last night with an M50B25 engine in it. engine runs ok. little but rough, probably just needs a service as the car has been sitting for a while. But the gearbox seems to be stuck in one gear. it doesnt matter if you use gear D, 1,2,3 it feels the same and drives the samein all gears. its got NO POWER what so ever. feels like pulling off in 3rd gear if it was a manual. it finally gets up to about 80kms/h at around 3000+rpm. and doesnt change gear at all. although after buying the car and driving around 40kms it started to change gear sometimes but still low end power was completely non existant.
last night by the time i got it home it was changing gears at low speed but still crazy underpowered. the engine revs fine in neutral.
this morning it was back to not changing gear.
Any ideas what i can try and or check. I was thinking to initially just change the gearbox oil and filter and see what happens but any advise would be greatly appreciated.
Also what gear oil should I use for the gearbox and what gear oil should I use for the diff?