Haha. I see the rear rubber plug. Did not attempt any stunts yet. How high do I need to jack this thing up?!
You have to pump out the old fluid with a transfer pump. Once fluid is out, you should be able to poor in new fluid (with car on level ground) until the fluid starts to pour out, then put the rubber cap back in.
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Thank you. And thank everyone for all your humble along the way. Just ordered an Amazon suction tube now and will use it to fill the oil back in as well as I do not have a Jack really available. I am hearing different ounces to go back in, but I will basically fill it slowly until it starts to come out. I assume the bottom of a gear or sit low in the oil and upon movement lubricate the rest that way?
I am blindly/dumbly hoping that this can help take care of some of the grinding/differential noise?
you don’t.
On level ground, you only fill to the bottom of the hole where the plug is. The oil only needs to cover a a few teeth of the large gear. The teeth will carry enough oil as is necessary up to the other gears and lubricate by contact. Thats all it needs.
When a gearbox gets over filled, bad shyt happens.
Thank you! I ended up adding about 6 ounces of fresh gear oil. I added it slowly until it started to leak out then put the cap back in and took it for a slow around the block test drive.
Fortunately, I would say this cleaned up about 80% of the noise I was hearing, there is still some sound when letting off of the accelerator, When coasting and it takes about one to five seconds for the sound to sometimes go away, almost if the motor had to catch up to the differential or something. I know that makes no mechanical sense but, then again I’m not a mechanic.
Well, that’s a start. 1 out of 3 isn’t bad.
To clarify- The video you posted in the other thread 15 hour ago are what is left over from AFTER you added some gear oil? (Thread hopping is very tough to follow, time consuming, and not recommended)
What about the other suggestions that you were offered earlier in this thread?(post 32)
Hey post 32 is from you! (Not deliberately hopping, just answer searching 
That’s helpful, and next on my to do list. I only have about 45min of free time a day, so today was the differential oil exchange.
“pull the motor” 3 easy words for a big job haha. I don’t have an air compressor to blow black dust out, or the parts yet. Do you recommend starting it anyways? I assume once I have the motor out, it’ll make sense to replace that little rubber thing you were talking about, gotta buy one of those. Thanks!
Here’s the link to SFGEM’s clapped out ride:
BTW, how did you post the streaming video in the thread? I tried to repost the link just for simplicity, but nothing worked…
Pulling the motor is usually not a difficult job If you’ve never done it before, give yourself a couple hours so you don’t bumblefvck it and break shyt.
I don’t have the time right now to write something up, but f you are going to pull the motor post your intent in this thread about a day, or at least a few hours, before and PM that you posted here so at least I can give you some tips about the gotchas.
Not having a compressor is easily solvable.
- Do you have a shop vac with an exhaust port you can plug the hose into and use the crevice tool as a blowgun?
- Hit up an office supply store for a couple cans of “compressed air”.
- Get a cheap 12v compressor that comes with a nozzle for blowing stuff off.
- Bribe a homeless (should be easy to find in SF) to blow, suck or lick it all out.
- etc
It could also be worn teeth on the input shaft comping out of the diff. Look head on down the input shaft and see if the teeth are worn to appear lopsided, Like one side is more flat than the other, both upward sides of the triangle started out with the same angle. Also, look at the teeth edges close to the diff, look to see if part of the teeth that was not inserted into the collet on the motor is noticeably taller than the section that was.
Anytime you pull the motor, you should replace the shaft bumper. Get the real GEM / Polaris one, which has a smooth outer edge, The ones with the knobs/“teeth” that stick up on the outer edge are for a different setup on golf carts and are much softer. They last about 20-50 miles in a gem.
Before you pull the motor, you can also try getting the front end up on jackstands, use a block of wood or the jack to raise the a-arm of one side so it’s kind of at the heigh it would be while driving, block or hold the other wheel from rotating and find a friend and have them press down gently on the accelerator. You could have a bad or worn u-joint in a half-shaft..