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You have to refill it through the trans dipstick tube.
You have to drop the whole transmission pan, then refill from the transmission dipstick
Next to the brake fluid refill cap.
Trans Dipstick
Usually thru the dipstick hole!
For automatic trans you refill the fluid thru the dipstick and for manual theres a fill hole in the tranny..
Through the automatic transmission dipstick tube with a funnel
Just take out the dipstick and refill the fluid through the dipstick "channel". Make sure that you do not underfill or overfill the fluid.
The 1992 Buick Regal transmission has a fluid capacity of 6.3 quarts. You can check the transmission fluid level with the transmission dipstick.
Use a funnel to pour it down the ATF dipstick tube.
Pull the dipstick handle out of it's holder and get a funnel that fits into the dipstick hole and fill it.
you can change the fluid, but not the filter. drain the fluid from the drain plug on the bottom of the transmission and refill from the dipstick. the filter is only accessable by overhauling the transmission