Good morning,
Do not use any additive to the fluid. The additive you are talking about will damage the transmission.
There is no additive that will fix your transmission. Just replace the filter and fluid and use the correct fluid.
https://www.2carpros.com/articles/how-to-service-an-automatic-transmission
As far as the level, at the end of the stick, it is only 2 quarts low. I doubt it will do any damage to the transmission.
https://www.2carpros.com/articles/automatic-transmission-problems
I attached pictures of the fluid pans. There are several types. Look at your pan or take a picture and match it up to see which one is correct.
Are there any codes stored?
Roy
FLUID/FILTER SERVICE
NOTE: Only fluids of the type labeled Mopar (R) ATF + 4, Automatic Transmission Fluid, should be used in the transmission sump. A filter change should be made at the time of the transmission oil change. The magnet (on the inside of the oil pan) should also be cleaned with a clean, dry cloth.
NOTE: If the transmission is disassembled for any reason, the fluid and filter should be changed.
1. Raise vehicle on a hoist. Place a drain container with a large opening, under transmission oil pan.
NOTE: One of the oil pan bolts (5) has a sealing patch applied from the factory. Separate this bolt for reuse.
2. Loosen pan bolts and tap the pan at one corner to break it loose allowing fluid to drain, then remove the oil pan.
3. Install a new filter and O-ring on bottom of the valve body and tighten retaining screws to 5 Nm (40 inch lbs.).
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NOTE: Before installing the oil pan bolt (5) in the bolt hole located between the torque converter clutch on and U/D clutch pressure tap circuits (Fig. 158), it will be necessary to replenish the sealing patch on the bolt using Mopar Lock & Seal Adhesive.
4. Clean the oil pan and magnet. Reinstall pan using new Mopar (R) Silicone Adhesive sealant. Tighten oil pan bolts to 19 Nm (165 inch lbs.).
5. Pour four quarts of Mopar (R) ATF + 4, Automatic Transmission Fluid, through the dipstick opening.
6. Start engine and allow to idle for at least one minute. Then, with parking and service brakes applied, move selector lever momentarily to each position, ending in the park or neutral position.
7. Check the transmission fluid level and add an appropriate amount to bring the transmission fluid level to 3 mm (1/8 inch) below the lowest mark on the dipstick.
8. Recheck the fluid level after the transmission has reached normal operating temperature 180° F.
9. To prevent dirt from entering transmission, make certain that dipstick is fully seated into the dipstick opening.
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Friday, January 17th, 2020 AT 2:14 AM