Gday all,
I'm running a 91 Brumby with the EA81 engine and the stock 4 speed trans with 218,000kms on the car. 16000 kms ago when I first got the car I changed out all the fluids including the g/box oil.
I used a name brand mineral oil the correct weight and volume etc but it has only taken this ling for the shift quality to nose dive hard into sucks-ville. I'm guessing the mineral oil doesnt stand up so well.
This time I went with a semi-synthetic oil and thought why not give that N70 stuff a go as well.
I'm not usually a fan of mechanic in a bottle stuff but I'm thinking after 27 years of wear on the dogs and synchros in the box it can't hurt. Worst case scenario is if the stuff was crap I'll dump the oil and start again.
Well... pleasant surprise. The new oil improved shift quality alot. After adding the N70 as well the box became realllllly smooth to operate and easily selects 1st gear while moving now.
So far so good. I'll report back after I clock up some miles and let you know how its holding up.
Cheers, Knucklehead.