Switching to synthetic question

[yellowbug]

I am changing the fluid in my M/T and it is currently conventional 75W90 gear oil. I want to switch to synthetic will it harm anything to do a straight swap?

 

[Muadeeb]

Not at all; you'll get nearly 100% out when you drain. It's only us AT folks that have to worry about the torque converter holding onto nearly half the fluid.

 

[yellowbug]

Thanks and now the age old question, what brand?

 

[NismoFire]

Royal Purple is a favorite.

http://royalpurpleconsumer.com/product-categories/automotive/#!synchromax-manual-transmission-fluid

 

[drbandkgb]

Im a Mobil 1 guy

 

[Xtacular]

Redline MT-90. Excellent excellent stuff.

I'm not aware of a Royal Purple nor Mobile 1 TRUE GL-4

 

[Silver dude]

Right depending on who you ask. If the lube is not exclusively GL4 certified it can eat the soft metals (brass) within the transmission.

Fill it a full 5 qt's to insure all the bearings are getting lube.

I use Redline MT90 its a oil that is not only slick but has a little grip to it to aid the shifting process. First thing I did when I bought my truck was install MT90. Shifts so much smoother especially in the winter.

Amazon has the best price online I think.