Fluids (engine, tranny, & diff)

[Aaron Sherrick]

I have a couple fluids questions for you guys.  For those of you using Mobil
1, are you still changing your oil every 3000 miles or are you stretching it
longer?

The shifting on my 4kq has been getting pretty "chunky" lately.  I've read
previous posts about people putting synthetic transmission and differential
fluid (like Redline) in their cars, and it has cured the problem.  Since
I've had the car, I don't think any of those fluids have been changed, so I
think this is a good place to start.   How often should those fluids be
changed?  What do you guys recommend for transmission and differential
fluid?  Thanks!

Aaron
'86 4kq