T-45 tranny fluid

[1BAD96SVT]

Which one to go with i would some good stuff, was thinking royal purple but read they arent the best for the t-45.. :dunno:

 

[warpspeed1414]

I went with the royal purple in mine and love it. My trans shifts so much better. Use to be a grind going from 4th to 5th. Its gone. Since then I'v put royal purple in the rear end and engine also. I like it.

 

[blackstangs281]

I use Mobil 1 in mine.

 

[powerfreak]

I used RP syncromax in mine...right after I changed it, it starting grinding a lot when it's cold. Once it warms up it shifts great. I might try switching back to the cheap stuff and see if it makes a difference...the grinding is annoying, never did it before.

 

[riored96gt]

Grinding? That's not good...and its probably not the fluid...

I use the Royal Purple in everything, Synchromax in the T-45.

 

[scarface]

I use moble 1 also.

 

[Steeda98GT]

So Royal Purple isn't good for the T-45??

 

[powerfreak]

So Royal Purple isn't good for the T-45??

I don't know honestly. I've read opinions either way. I know on mine (111K miles, whiney input shaft bearing), when I put in RP syncromax it would grind when it was cold. It shifted GREAT once it warmed up. I drained out the $25 of RP and went back to the cheap stuff and now it's better. SO I think if you have a high mileage tranny, stay with the cheap stuff. If you have some tranny issues, don't expect RP to be a quick fix.

 

[SonicStang]

I used the stuff you get at Ford and added a little bit of friction modifier.

 

[riored96gt]

Friction modifier in the tranny????

 

[powerfreak]

Friction modifier in the tranny????

well...our tranny's take ATF...so who the hell knows. :dunno:

I have heard of friction modifier in T45's though.

 

[MoonlightGT]

i rebuilt my t-45 2 years ago and put GM syncromesh fluid in it and it shifted great. Then i decided to flush and fill it cause it had been 2 years and i used Moblil 1 synthetic ATF and right after i changed the fluid i noticed if im cruising in 4th gear for a while and i push the clutch in , i cant get out of 4th!! it sticks for a few seconds then slips out. Im going to get some more GM syncromesh fluid and change it back.

 

[Jrgunn5150]

I always used GM synchromesh in the T45, I use it in my current T56 too.

 

[Goldmember]

Mmm... Synchromesh FTMFW I used it in one of my Camrys way back when and DAMN what a difference!

Glad to hear our T45's like it too, guess I'm tossing some in. But my plan of attack is a little different...

Should I-
Go STRAIGHT TO Synchromesh
or
run ATF for 4-5K then dump it and go for Synchromesh?

I don't know how long the fluid in the trans has been there, might be original. I'm leaning toward a cycle of ATF then Synch.

 

[Jrgunn5150]

I would just go staight to synchromesh.