xHighOctanex Posted April 19, 2016 Report Share Posted April 19, 2016 Hey, I've Google this and searched this a bit but I'm still a little confused, what is the easiest gear oil to come by that I can use for my Trans, transfer, and both diffs, currently I have some slightly too thick of fluid in my Trans, isn't the easiest to go 1st to 2nd when leaving my house in the morning. Have had the truck on the road for a few months now and have beat on it a little in the mud and what not so I'd like to change everything out. Thank you Quote Link to comment
flatcat19 Posted April 19, 2016 Report Share Posted April 19, 2016 Trans...yellow-safe GL4. 80w/90 for diff is fine. Quote Link to comment
Draker Posted April 19, 2016 Report Share Posted April 19, 2016 Sta-lube GL4 available at napa. About $12 bux a quart.. but you don't need a ton. 2 should do it. Whatever you can find for the diff as flat mentioned. Quote Link to comment
Lockleaf Posted April 19, 2016 Report Share Posted April 19, 2016 DMike recently started using Synchromesh type trans fluid in one of his transmissions. He noted that it smoothed out his cold shifts. It's yellow metal safe 1 Quote Link to comment
datzenmike Posted April 20, 2016 Report Share Posted April 20, 2016 GL-4 80w90 for transmission. NEVER allow GL-5 to be used for this. Don't let some counter monkey tell you GL-5 is better.... it is but what makes it 'better' that GL-4 also erodes you brass synchros. You need GL-4 or,it must say 'Yollow metal or brass compatible' on the bottle. 80w90 is the Nissan recommended weight but you have a worn transmission and cold shifting may be slightly balky. Synthetic oils are 'thinner' but so slippery they will often leak past old seals. I had already replaced the $4 rear transmission seal before switching to the General Motors AC Delco Synchriomesh oil so there were no leaks but I have used a different synthetic 'blend' before an it leaked (just wetness at the back around the driveshaft) until it was changed. Runs very well, up-shifts much better when cold. I rarely used to downshift as it would grind slightly into second, and first you almost had to use both arms to push the shifter..... now it's like silk. This transmission I saved out of a '79 zx probably 20 years ago. My 620 transmission packed it in so I swapped this one in and it's been across Canada and back at least 6--7 times. Now it's been in my 710 for 4 years. Transfer case... use the above GL-5 for it Steering box ... GL-4 Power steering... Dexron ATF Differential... GL-5 80w90 or a good synthetic. 2 Quote Link to comment
xHighOctanex Posted April 20, 2016 Author Report Share Posted April 20, 2016 So to be clear, when I built the truck we did my rear output seal, I can run the synthetic you're talking about? Quote Link to comment
datzenmike Posted April 20, 2016 Report Share Posted April 20, 2016 That's what I found. An old seal just doesn't seal well with synthetic oil. Quote Link to comment
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