Fluid changing

[reeder123]

Now that Rodney seems to be running okay I decided I'd better change and flush some of the vital fluidsseeing as how it sat for 3 or 4 years un-driven. So my question here is what fluids should I be sure to change? (apart from the obvious, motor oil, trans fluid) and as far as flushing the trans, this will be my first time, from what I gather on other posts I'm going to be using gear oil right? any recommendations on what kind? Thanks in advance for the help!

[dlb]

after driving ron for a year and a half i'm finally getting to the trans too. the manual for my '87 recommends:

4.1 L of SAE 75W-90 or 80W-90, type API GL-4 or GL-5 for the manual tranny
1.1 L of SAE 90 (above 0*F), or SAE 80W/SAE 80W-90 (under 0*F) for the rear diff

for automatics:
4.4 L of ATF dexron II for the auto tranny
1.0 L of SAE 90 (above 0*F), or SAE 80W/SAE 80W-90 (under 0*F) for the front diff
rear diff is the same as on the manual, 1.1 L of SAE 90 (above 0*F), or SAE 80W/SAE 80W-90 (under 0*F)

now, i looked at my usual haunts and couldn't find SAE 90 for the rear diff. all i could find was SAE 80W-90 so i asked at both places and they both said it wouldn't be an issue. my understanding is that SAE 90 thickness is consistent regardless of temperature while 80W-90 will be a little thicker while it's cool. if someone can let me know if i can settle for the SAE 80W-90 i would appreciate it!

other fluids: i would definitely flush the rad. old rads get full of sh*t. some guys don't like to use stuff to clean it out but i did it recently and had no problem. i used a prestone solution that just mixed with tap water, drove with it for a few days, flushed it out, refilled and flushed, and then filled with the proper antifreeze/water solution. super easy. if you're not sure when the brake fluid was last done it would be a good idea to check it and flush it if it looks brown or muddy. power steering fluid can just be topped up.

[Petros]

the modern multi-vis gear oil such as 80W-90 will work fine in trans or diff, they are actually better for the car than the old strait 90w. I am surprised you can not get 90w anymore. Make sure the lube is for hypoid gears, there are extra demands for hypoid ring and pinon which is both in the diff and transaxles. You might consider a gear lube additive as well. Rear diffs are pretty durable and quality lube should it all it needs.