1st gear pops out.

[macca86]

Hi lads and ladies.
I have a gu zd30 manual gearbox. My gearbox keeps slipping out of first gear if I go over bumps or back off and let the engine drive it. I was after your opinion as to the problem?

Before I turned it into a submarine and drowned her I never had this problem. I flooded her with silt muddy water. I had to replace clutch as it blew up and I noticed this gearbox problem after I got it back from the mechanics. The gearstick lever came off in my hand as they forgot a circlip that holds it in I have replaced this as well as the bushed. I have dropped the oil twice since the flood with castrol oil correct grade according to their book vmx or something cant remember.
In order of what I think the problem is : The spring at the bottom of the lever or the gearbox mounts not fitted or shagged or the mud has destroyed the box and needs recoed any thoughts and anyone wanna fix it for me?

[threedogs]

I think you're missing a part from when mechanic had it.
Just can't see mud doing damage to gears etc

[macca86]

was heavy silt mud it destroyed clutch slave cylinder altenator atarted motor belt tensioner pully etc. I am hoping it's the spring is shagged I'll replace it next weekend as I've changed the nylon bushed split rings and cirlips in it already. I can't find the gearbox and lever schematics to help with my search so if anyone has them can they put them up? then I'll do the gearbox mounts then I'm screwed haha gearbox replacement it 1800 from the wreckers haha

[macca86]

that's the spring I need to change I think. I just find it dangerous and want it fixed crawl out of an intersection see a gap give it a bit to get through traffic and pop out it goes and left in the road and once down hill very steep rocky shale almost made me crash brakes and low 2nd were just too fast

[threedogs]

Is this only in 4wd?

[macca86]

In 4wd and 2wd it's definertly gearbox rather than transfer case related

[macca86]

I might try it in the order I said earlier as it's cheapest fix first unless anyone has any better ideas

[Yendor]

was heavy silt mud it destroyed clutch slave cylinder altenator atarted motor belt tensioner pully etc. I am hoping it's the spring is shagged I'll replace it next weekend as I've changed the nylon bushed split rings and cirlips in it already. I can't find the gearbox and lever schematics to help with my search so if anyone has them can they put them up? then I'll do the gearbox mounts then I'm screwed haha gearbox replacement it 1800 from the wreckers haha

Is this what you are after?

[macca86]

yes yes it is Thanks mate

[threedogs]

maybe the guide plate is bent , or the spring and balls are shagged both R and L hand side. thinking is if nylon
on selector wears it may cause you when shifting to bend that guide plate .

[macca86]

Might change bush and spring under the control plate and the spring above the control plate
I changed rings and bushes above return plate already

[threedogs]

How hard to check the guide plate, if bent may continue to cause grief

[macca86]

It's pretty tight in there I'm doing this with out dropping the box out but may have to to get to this part but you gotta do what you gotta do