Stop Slip for an Automatic

[Legasea]

The 09 Legacy sedan I purchased, I assume, did not have regular fluid maintenance because my oil change looked like chocolate syrup.

 

I found when letting off the gas, the gears weren't smoothly shifting as they should.

 

Example, when I'm going about 40-45 down a hill and i lightly have my foot on the gas to keep momentum(my commute to work is hilly, maybe this is why, but it does the same "motion" when im going on a straight-away).

 

I did a transmission drain(not a flush) back in July and it helped some, but now I see I'm dealing with the same situation. It's gotten cold out from living in New England. Maybe this is the reason, but I don't quite know and would like some insight if I may. When doing the flush, the fluid was veeery dark and not a nice bright red. I filled her up with about 3 quarts of Royal Purple and a 4th qt of Lucas Stop Slip.

 

My main inquiry was about doing another drain, but should I use another bottle of stop slip in doing so? Or only straight Royal Purp(my preference)? Sorry for the dumb question. My father is a backyard mechanic but I wanted to get another opinion as well before spending the money and time in doing this. Any help would be appreciated. Thank you.

[VespaGTS]

I haven’t tried stop slip before. It doesn’t sound like your transmission is slipping. Keep in mind when you drain the transmission there’s a lot of fluid left over inside it does not come out. People have different opinions on doing a drain versus a flush. Personally, I found a shop that uses BG products and had the transmission flushed. It was night and day for me and worth $125 it cost. I think a lot of the arguments against flushing was due to the fluid being pushed back through the transmission and things getting clogged. There is also a transmission filter that should be changed if the fluid looked that bad. Just my thoughts, hopefully somebody else chips in. If it was me I would do a flush at a shop that uses BG products.

 

Also, do all the fluids if you don’t know when they were done last. Worth every penny for longevity.

[59ctd]

Yeah, change the fluid at least 3x times if you are doing a drain and refill. That gets it like 80%+ renewed. One drain/fill is not enough to make a big difference. I would not use the stop slip additive. If it still slips then it needs a rebuild or replacement. These are not that expensive at a salvage yard.

[Legasea]

Yeah, change the fluid at least 3x times if you are doing a drain and refill. That gets it like 80%+ renewed. One drain/fill is not enough to make a big difference. I would not use the stop slip additive. If it still slips then it needs a rebuild or replacement. These are not that expensive at a salvage yard.

 

Thank you for the advice, dude. My dad has said it's just the overdrive is what is happening. If that makes sense and sounds normal, then I should be fine doing the drain 3 more times. We added a singular bottle of stop slip initially back in July. I appreciate the reply !

[Legasea]

Yeah, change the fluid at least 3x times if you are doing a drain and refill. That gets it like 80%+ renewed. One drain/fill is not enough to make a big difference. I would not use the stop slip additive. If it still slips then it needs a rebuild or replacement. These are not that expensive at a salvage yard.

 

I haven’t tried stop slip before. It doesn’t sound like your transmission is slipping. Keep in mind when you drain the transmission there’s a lot of fluid left over inside it does not come out. People have different opinions on doing a drain versus a flush. Personally, I found a shop that uses BG products and had the transmission flushed. It was night and day for me and worth $125 it cost. I think a lot of the arguments against flushing was due to the fluid being pushed back through the transmission and things getting clogged. There is also a transmission filter that should be changed if the fluid looked that bad. Just my thoughts, hopefully somebody else chips in. If it was me I would do a flush at a shop that uses BG products.

 

Also, do all the fluids if you don’t know when they were done last. Worth every penny for longevity.

 

 

Thank you! I look forward to getting every mile I can outta my baby.