150K+ with Factory Drivetrain Fluids

Bought my truck in college with 73,000mi on it. Can't remember if the old owner ever swapped the (manual) transmission, T-case, and diffy oils. I'm assuming no and now she's got 155,000mi on her. Time for some servicing?

Is that old wives tale about NOT changing drivetrain fluids if you missed the scheduled mileage only applicable to auto transmissions or manuals as well?

Bonus: if it's ok to change the oils, what do you recommend I use? I've heard good things about Royal Purple and Redline MT

 

You've got a manual, so no risk in changing it all. I used Lucas because it was 1/3 the price of redline. ($28 a quart after 30% off with corporate discount! Gulp).

She's nicely broken in, that's for sure.

 

All the confirmation I need. Thanks for the piece of mind Sharpish.

Looks like my Saturday just got busier