does somebody have try royals purples syncromax tranny oil and rear end oil in the rexes? does they work good? thanks

 

Can't remember what the name of the Royal Purple was when I put it in. Been soooo long. It actually "feels" better than Redline I had in. The temps went way down as felt on the trans tunnel. Fuel mileage may have gone up as a result, haven't documented my mileage yet.
All can say is I love this stuff. It's much better than Royal Purple IMHO. Most of my friends have switched from Redline to RP because of me. I use it in all my vehicles and switched over with 100k miles or more.
No need for a flush as some peeps have said. Just drain old and fill new. No need for LSD additive as I recall.
Good Luck!

 

Can you clarify that? What's better than Royal Purple? And then why are people switching TO Royal Purple?

 

I had Red Line in my '83 due to a very crunchy shifter. My '85 doesn't have a notchy shifter so I went with RP. IMO, if you have synchro problems, RL is the way to go - if you don't, I would go with RP.
From what I have heard, the RL has friction modifiers that actually induce more friction to help your synchros engage - great to help out a tired / notchy shifter but I'm hesitant in putting it in a healthy tranny. My opinion only....

 

I've had excellent results with Amsoil 75W-90 in both transmissions and rearends (non-LSD). It even pretty much "cured" my skritchy 3rd gear synchro in my RX4!
Good stuff, even if it doesn't have a color in it's name...