Has anyone used Royal Purble Syncromax in their tranny?

[LamaRossa]

It's time for me to do a transmission fliud change. I'm thinking of using Royal Purple Syncromax from Pep Boys. Is anyone else using this stuff in their transmission?

I was also thinking of adding GM differential additive, is this a bad idea?

Thanks.

LamaRossa.

PS: My transmission has 234k miles on it.

 

[speed]

good lord. When i first joined this site, I thought all the crap these guys gave you was unwarranted.

But your typing is fucking annoying. Take off the caps lock, use punctuation, and write in complete sentences. Good Grief.

 

[jmanbball]

Considering the fact that synchromax is designed for manual transmissions that originally used automatic transmission fluid, and the R154 is designed to use 80w-90 gear oil, I personally would not recommend it. I'd try one of royal purples gear oils first.

 

[Jeff Lange]

Post edited for sanity.

 

[Neodeuccio]

I'm curious too... What have people added to their R154's to get smoother shifts?

 

[suprajjang]

I'm curious too... What have people added to their R154's to get smoother shifts?

i used redline mt-90 and it felt like a whole new transmission after changing to it

 

[ryanday]

as for the differential, go with the ford additive

 

[jdub]

i used redline mt-90 and it felt like a whole new transmission after changing to it

Red Line MT-90 is excellent...it's 75W-90. It would be my 1st choice on a manual tranny.

If you are going to use Royal Purple, get the Max-Gear 80W-90...the 75W-90 will work well too, especially in a bit colder climate.

Do not use any friction modifier additives in the tranny.

 

[bowsercake]

I used the MT90 and it worked pretty well. Didn't make my transmission feel like new but it did help.