Transmission fluid question

[jmora78]

Good Afternoon,

 

I have an 86 K1500, with a manual transmission, and I want to replace the transmission fluid with synthetic. I purchased Royal Purple 75W90 based on the recommendation from the auto parts employee. He said 75W90 would be fine since I'm shifting to synthetic, even though the manual calls for 80W. The Royal Purple is listed for GL-5 applications.

 

Are there any concerns, in anyone's opinion, with shifting to the 75W90 synthetic?

 

Thanks in advance for your feedback.

[gmtech4]

Good Afternoon,

 

I have an 86 K1500, with a manual transmission, and I want to replace the transmission fluid with synthetic. I purchased Royal Purple 75W90 based on the recommendation from the auto parts employee. He said 75W90 would be fine since I'm shifting to synthetic, even though the manual calls for 80W. The Royal Purple is listed for GL-5 applications.

 

Are there any concerns, in anyone's opinion, with shifting to the 75W90 synthetic?

 

Thanks in advance for your feedback.

Nope , drive the 'old girl !!