volvo 940 GL 1991

Ordinary gearbox as in manual transmission? The US models are all automatic but if you are elsewhere it could be either. We need more details, under what conditions is it locked up? What gear is it stuck in?

In this case (holland) it is a manual gearbox. It lockes the gearstick driving in the 5 gear while releasing the accelerator pedal, decluth and trying to gear down. I have to declutch and bring the car to standstill. Then I switch off en on again and then I can choose the first gear again and move on

"James Sweet" schreef >> Sometimes my gearstick of my volvo 940GL is completely locked-up. I am

What happens if you start the engine, depress the clutch, then shift into reverse? Does it grind? If so, then your clutch may not be fully disengaging. If that isn't it, it sounds like you have an internal gearbox problem. Is it only 5th gear that it gets stuck in?

I'm envious of those places that got manual-equipped 900's, over here in the US if we want one, we have to make it ourselves, and the M90 gearbox has to be imported from Europe.

I am very pleased with your attention. Indeed it happens sometimes also in other gears and it grinds shifting into reverse sometimes too. I understand that I have to find out if declutch is oke. From other parts of the internet I also found remarks about the oil level in the gearbox. I will look into these things.

"James Sweet" schreef >> In this case (holland) it is a manual gearbox.

Yeah it really sounds like your clutch is not disengaging fully. This could be the pressure plate, release bearing, clutch fork, or the hydraulic system. It's hard on the gearbox to drive it when this is happening.

If the clutch checks out OK and is correctly adjusted, the next thing is to drain the fluid and replace it.

Try Redline MTL.

I've had good luck with MTL, however this problem sounds much more severe than old fluid. Either it's something simple like the clutch, or there's something actually broken inside the gearbox.