92 cruiser worn synchros

Hi Barry,
About four years ago my old girl was doing the same, had no idea how old the oil was so I changed it. The only thing not to be recorded in the log books that came with her when I purchased her in August 05.
I used Nulon 75W-90 semi Synthetic in both the gear box as well as the tranfer case, it made a big difference.
I'd try changing the oil first, if the problem persists you'll have to look deeper.

Hi Barry

I have the same problem with the synchros,as probably 90% of all other old crusiers have LOL.
And cold shift problems.

I changed the gear box oil about 8 weeks ago to redline mt90.
And there was a noticeable improvement in cold shift ,and improvement on the gear change between gears 3rd and 4th.
This can also be improved buy how you shift gear.
I find buy pausing briefly between gears and release the weight of the gear stick momentarily improves shifting no crunching at all.
Or the old double shuffle works well too.

I think redline is well worth a try, until you decide to drop the gearbox out, wait till you need to do the clutch.
As the gear box should battle on like that for a long time.

The best place to get redline is this guy on ebay

Site Link

Rob

What model is it? If its an 80 series with 300000klm+ it probably needs new synchroes.
If its a 75 series ,you might be lucky with an oil change.

Hi Barry,
I had a 91 80 series with the same problem 400,000 ks changed to castrol vmx the crunching slowly stopped after about 500 or so ks 455,000 now still smooth cheers Ron

The only oils to use are a straight 75W oil or Transmax Z (synthetic auto fluid) or the one I like the most Is Mobil agri fluid 424 designed specifically for 4WD and wet clutch environments (friction addatives included)
I can change down to 2nd at 40km/h with slight rev no worries in a 75 series with 445K up on it

I notice a big difference using Redline MT90 and gear changing and it reduced noise from the box as well. Not cheap though