Cannot add hydrostaic fluid.no plug.it was filled at the factory.how can i add the fluid.

Depends on your engine.

1980 JEEP CJ-7 2.5L 4-cyl Engine Code [B]
CAPACITIES
Engine, GM without filter..........2.4 quarts[1]
Wix Filter ........ 51040
Cooling System, Initial Fill..........8.0 quarts
Automatic Transmission, A904, 30RH Initial Fill..........4.0 quarts[2]
Automatic Transmission, A999, 32RH Initial Fill..........4.0 quarts[2]
Automatic Transmission, Total Fill
3 speed A999, 32RH..........8.4 quarts
3 speed A904, 30RH..........7.0 quarts
Manual Transmission, 4-SPD, SR-4..........3.0 pints
Manual Transmission, 4-SPD, T176..........3.6 pints
Differential, Front..........2.5 pints[3]
Differential, Rear..........4.9 pints
Transfer Case,..........4.0 pints

1. Add extra oil when replacing filter. After refill check oil level.
2. With engine automatic transmission operating temperature, shift through all gears.
Check fluid level in NEUTRAL and add fluid as needed.
3. 1984-1992 Models with command-Track, add 5 oz of 75W-90 GL-5 to shift motor housing opening.

TORQUES
Oil Drain Plug.....25 ft-lbs
Manual Transmission T176
Fill Plug.....15 ft-lbs
Drain Plug.....15 ft-lbs
Manual Transmission SR4
Fill Plug.....20 ft-lbs

1980 JEEP CJ-7 4.2L 6-cyl Engine Code [C]
CAPACITIES
Engine, without filter..........5.0 quarts[1]
Wix Filter..... 51522
Cooling System, Initial Fill..........11.0 quarts
Automatic Transmission, A904, 30RH Initial Fill..........4.0 quarts[2]
Automatic Transmission, A999, 32RH Initial Fill..........4.0 quarts[2]
Automatic Transmission, Total Fill
3 speed A999, 32RH..........8.4 quarts
3 speed A904, 30RH..........7.0 quarts
Manual Transmission, 4-SPD, SR-4..........3.0 pints
Manual Transmission, 4-SPD, T176..........3.6 pints
Differential, Front..........2.5 pints[3]
Differential, Rear..........4.9 pints
Transfer Case,..........4.0 pints

1. Add extra oil when replacing filter. After refill check oil level.
2. With engine automatic transmission operating temperature, shift through all gears.
Check fluid level in NEUTRAL and add fluid as needed.
3. 1984-1992 Models with command-Track, add 5 oz of 75W-90 GL-5 to shift motor housing opening.

TORQUES
Oil Drain Plug.....30 ft-lbs
Manual Transmission T176
Fill Plug.....15 ft-lbs
Drain Plug.....15 ft-lbs
Manual Transmission SR4
Fill Plug.....20 ft-lbs

1980 JEEP CJ-7 5.0L 8-cyl Engine Code [H]
CAPACITIES
Engine, without filter..........4.0 quarts[1]
Wix Filter..... 51258
Cooling System, Initial Fill..........13.0 quarts
Automatic Transmission, A999, 32RH Initial Fill..........4.0 quarts[2]
Automatic Transmission, A904, 30RH Initial Fill..........4.0 quarts[2]
Automatic Transmission, Total Fill
3 speed A904, 30RH..........7.0 quarts
3 speed A999, 32RH..........8.4 quarts
Manual Transmission, 4-SPD, SR-4..........3.0 pints
Manual Transmission, 4-SPD, T176..........3.6 pints
Differential, Front..........2.5 pints[3]
Differential, Rear..........4.9 pints
Transfer Case,..........4.0 pints

1. Add extra oil when replacing filter. After refill check oil level.
2. With engine automatic transmission operating temperature, shift through all gears.
Check fluid level in NEUTRAL and add fluid as needed.
3. 1984-1992 Models with command-Track, add 5 oz of 75W-90 GL-5 to shift motor housing opening.

TORQUES
Manual Transmission T176
Fill Plug.....15 ft-lbs
Drain Plug.....15 ft-lbs
Manual Transmission SR4
Fill Plug.....20 ft-lbs

Oilman

Have you checked the seat safety switch?

CAPACITIES
Engine, 2WDwithout filter..........3.5 quarts[1]
Engine, 4WDwithout filter..........4.0 quarts[1]
Cooling System, Initial Fill..........8.5 quarts
AMSOIL Antifreeze and Engine Coolant
Automatic Transmission, Total Fill..........7.4 quarts
Manual Transmission, 2WD..........4.2 pints
Manual Transmission, 4WD..........8.4 pints
Differential, 2WD Rear..........3.2 pints
Differential, 4WD Rear..........2.7 pints
Differential, Front..........2.7 pints
Transfer Case,..........4.6 pints

1. Add extra oil when replacing filter.
refill check oil level.

TORQUES
Oil Drain Plug.....22-29 ft-lbs
Transfer case
Fill Plug.....18-25 ft-lbs
Drain Plug.....18-25 ft-lbs
Manual Transmission
Fill Plug.....18-25 ft-lbs
Drain Plug.....18-25 ft-lbs

www.searspartsdirect.com
you will need your model number

The tranny fluid is added through the tranny dipstick (make sure it's not the oil dipstick). Fluid color should be red and the dipstick should have instructions on how to check level (car in park, engine at idle). Funnels are your friend here.

take it back from where you bought it and get another.

it is complicated. the red cap on the top is where you add fluid - but - there is a way to fill it without overfilling. it must be running, the plug underneath must be removed, and once it runs out of the hole as you add the fluid on top, it is full. Replace the plug, and it is done.
The plug is on the case - 2 inches above the bottom pan edge, just in the front of where the axle goes in on the passenger side

If automatic transmission use the dip stick tube to fill, but watch that you don't over fill.

If you transaxle is leaking badly adding oil may not help long term,if you remove the back hitch plate there is a allen wrench plug or a rubber vent hose, you can add oil there,measure down from the top of transaxle and fill to within 1.5 inch of the top,always allow 1.5 in of air space in top to allow for expansion. Add amsoil or mobil 1 synthetic motor oil 15w-50 or 20w-50. Do not use transmission fluid or hydraulic oil.

If your vehicle has the 5.2 liter,aka 318 cubic inch engine,there is only one transmission model applicable and it is the 42 RE which used to be designated the A500.It is a 4speed overdrive transmission.If installing a rebuilt trans and new remanufactured dry torque convertor.You add 4 quarts initially,then fire the engine and add another 5-6 quarts for a total capacity of 9-10 quarts.Fluid level is checked with the trans in Neutral.If you are only dropping the pan,you will replace roughly 4 quarts.The transfer case fills separately,but uses the same automatic transmission fluid.Capacity for the transfer case is about 2 quarts/fill to the bottom of the fill plug hole.Good luck.