I'm going to take the route of some other users and hopefully attempt to update this after some time to give the best review.

I bought this because I really had read nothing but good reviews. There were the occasional people who said you should never need additives, but there are always going to be people that think you should never use anything other than what the manufacturer recommends. I have an older Chevy truck that has had firmer shifts in it's older age. Other times the shifts would seem to drag and take an extra second to engage. I went ahead and poured the entire bottle in as it says 1oz per quart and I believe my transmission takes anywhere from 10-12 quarts. I check the fluid level after I added it and then went on my way.

Right out of the gate the shift between 1-2 seemed smoother, but I started to think maybe this was my imagination. There are a lot of stop signs between my house and work and every time it seemed to be a lot more consistent and was a lot less harsh than before.

I doubt this stuff is a miracle worker for transmissions on their last leg, but those that need some tweaking this could very well make a difference. The price is right and so far I'm happy with it.

Edit.

Well I already am updating this because it seems to no longer due what it did. After driving the truck around today I noticed that it is back to it's old ways. Granted this vehicle has around 100k miles I wouldn't say it's high but it isn't out of the question that this transmission is beginning to see it's age. Regardless I changed this product to 2 stars as it seemed to do something immediately, but has already worn off. I'm not sure that this product does much of anything, and at this point don't know that I'd buy again. Price was right, so I'm not too unhappy about the situation.
I'm going to take the route of some other users and hopefully attempt to update this after some time to give the best review. I bought this because I really had read nothing but good reviews. There were the occasional people who said you should never need additives, but there are always going to be people that think you should never use anything other than what the manufacturer recommends. I have an older Chevy truck that has had firmer shifts in it's older age. Other times the shifts would seem to drag and take an extra second to engage. I went ahead and poured the entire bottle in as it says 1oz per quart and I believe my transmission takes anywhere from 10-12 quarts. I check the fluid level after I added it and then went on my way. Right out of the gate the shift between 1-2 seemed smoother, but I started to think maybe this was my imagination. There are a lot of stop signs between my house and work and every time it seemed to be a lot more consistent and was a lot less harsh than before. I doubt this stuff is a miracle worker for transmissions on their last leg, but those that need some tweaking this could very well make a difference. The price is right and so far I'm happy with it. Edit. Well I already am updating this because it seems to no longer due what it did. After driving the truck around today I noticed that it is back to it's old ways. Granted this vehicle has around 100k miles I wouldn't say it's high but it isn't out of the question that this transmission is beginning to see it's age. Regardless I changed this product to 2 stars as it seemed to do something immediately, but has already worn off. I'm not sure that this product does much of anything, and at this point don't know that I'd buy again. Price was right, so I'm not too unhappy about the situation.