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Your cart is empty.Hapco Slick Shift - Transmission Fix eliminates slip, chatter and hesitation in all transmissions. Formulated to quickly remove sticky gum and varnish buildup on friction surfaces. The cleaning and lubricating properties of Slick Shift help restore fast, sure shifting of gears and smooth acceleration. For Best Results: Add one 16 oz. bottle of Slick Shift directly to transmission reservoir when gum/varnish buildup is suspected. (Any slippage or unusual acceleration can be a sign of minor varnish buildup.) Drive vehicle for a minimum of 30 minutes to thoroughly clean the transmission. After gum and varnish are removed and performance is restored, filter and fluid should be changed after 50 to 100 miles of driving. Compatible with all transmission fluids.
Char
Reviewed in the United States on June 22, 2024
I have a 2002 Subaru Outback H6 with a 4eat, and when I bought it there was an issue with the transmission slipping when cold. Mostly when going from a standstill, and hard shifts as well.I did a drain/fill on the transmission, and first added this Slickshift and then completed the fill procedure with high quality ATF.The slipping issue is completely gone now, done about 1k miles on it and it runs great now! Sometimes it still has some hard shifting, but nothing too bad for a car with 240k!
E U Franklin
Reviewed in the United States on October 16, 2023
I was having serious issues with transmission performance. It was lunging and jerking and making a terrible rattling noise. My mechanic told me to get some Slick Shift. He had put some in his wife’s car and it made a tremendous difference. So I did the same. My car is 13 yrs old and I was nothing short of amazed!!!! It runs like it did the day I bought it! I highly recommend Slick Shift!
Rich B
Reviewed in the United States on January 9, 2022
I had my doubt this would workAfter I put it in, it was a matter of a few miles that I noticed how the transmission not only shifted better but was much quieterHope it lasts
Bonnerro
Reviewed in the United States on June 10, 2021
I bought a 928 that had slippage in the shifting. We took Some of the old transmission Fluid out and added the slick shift. Drove it around the block and now it doesn’t slip. Amazing! Most transmission shops didn’t want to touch my car. This product made a difference! Thank you.
Marcos T Leal
Reviewed in the United States on June 18, 2020
Easy to install and seems to fix my slipping issue when shifting
Hattie Mae.
Reviewed in the United States on December 22, 2020
This product works so great my transmission shift really great since I used this.
IBBill
Reviewed in the United States on November 20, 2020
Not perfect- BUT Good
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