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read the manual
Through the dipstick tube
To change differential fluid on a 1997 CR-V the vehicle needs to be lifted up to reach the rear differential. Find the drain plug located on the underside of the unit. Pull the plug and drain the fluid, when done place the plug back add fluid into the fill hole which is located topside of the differential.
Add fluid the same place you check it. Caution: Do not overfill!Add fluid the same place you check it. Caution: Do not overfill!
If its an automatic just add the fluid right through the dipstick tube, If its a manual theres a plug to remove on the tranny (drivers side I believe) and just add it through there.
The rear differential fluid goes directly into the rear differential. There is normally an inset plug that has a square drive on it that accepts a 3/8" ratchet or ratchet extension. Remove this plug. If fluid comes out, you do not need to add any. If no fluid comes out, add enough of the fluid recommended by your vehicle manufacturer (normally 80/90 gear lube, but not always) where you took out the plug, until it starts to seep out the plug hole. Replace the plug and you're finished.
Look at the rear differential housing - you will see two plugs in the housing an upper and a lower. Loosen the upper plug - if fluid runs out of it you have sufficient fluid - if not - add fluid until it just starts running out - then replace plug.
To check or change the differential fluid in a 1989 Club Car golf car you will need to remove the oil cover. Unscrew the bolts and brass fitting.
When the fluid falls below the bottom of the filler plug hole it is time to add fluid. Add fluid until the level reaches the bottom of the filler plug hole. In other words, add fluid(while parked on a level surface)until it begins to run out. I have a 99 Tahoe and the manual doesn't list any quantity/capacity for the differential, only how to check the level and refill if needed. Mike
On the upper right (passenger for a left hand drive vehicle) side of the differential, there's a plug. IIRC, you need a 3/8" drive ratchet to remove it. That's where you add your diff fluid.
Into the power steering pump reservoir.
Use the drain. After that refill with appropriate fluid using the side refill hole. Make sure that the car is leveled and add the fluid until it starts to drain through the refill hole.