[zukenutter]

Hi guys, last time I had the Jimny in 4WD I noticed some rumbling noise and vibration.
2WD is fine.
2WD with hubs locked is fine.
Only an issue when in 4H or 4L.

I've tried two different transfers so I don't think it's that, but could be wrong.

The front hubs/axles/diff seems to have quite a bit of play.

At the moment I'm thinking CVs or diff, keen to hear your thoughts.

[Gwagensteve]

Front driveshaft slip yoke.

[zukenutter]

It does have play in it Steve, I'd ruled that out based on it had play prior to the current issue but maybe it's just gotten to a more noticeable state of wear. I'll have a look again tomorrow, what's an acceptable level of slip yoke play?

[Gwagensteve]

Unbolt front driveshaft and drive it in 2H, with and without hubs locked, and in 4h and 4l. Easy way to rule it out. Don't have a rule of thumb for wear- less is always going to be better than more.

[zukenutter]

I'll update tomorrow after giving it a try.
Seemed weird to me that 2H with hubs locked didn't rumble but I guess that's due to no torque going through.

Side not, where do you think all the play in the front end would be coming from. Last time I had the shaft off I could turn the input flange 5-10° while the hubs are locked.

[Scrawny]

Could try pumping slip joint full of grease also, as well as unis if they're greaseable.

[zukenutter]

Slip joint has plenty of grease but I'll have a good look at the unis when I pull the shaft.

[Gwagensteve]

5-10 degrees is nothing. I don't even think I'd be worried at 20-30 degrees. There's lots of places for play built in to a front end.

[zukenutter]

okay, that's good news