Tranny fluid ?

[sycloned916]

What kind of gear oil or tranny fluid goes into my 4-speed tranny,I think it's low and want to change it but not to sure on what to us.Thanks!

[defdes]

80/90. I use Mobil 1 synthetic. But any reputable brand, Valvoline etc will work fine.

[sycloned916]

Thank You. I tried to search but could not find anything.

[ggzilla]

Older manual transmissions do not use 'transmission fluid'. Use 90W gear oil, per your Datsun owner's manual. Today you can use 85W-140 weight gear oil.

Edited April 12, 2009 by ggzilla

[datzenmike]

Ask for and make sure you get GL-4 rated oil. Don't let them tell you GL-5 is a better replacement for it. GL-5 is for rear ends that have no brass parts in it. If no GL-4 then switch to synthetic.

[sycloned916]

I got Valvoline Synthetic 80-140wt. Seems to shift alot smoother than that nasty gray old oil.

One thing thoe when i drained the old oil on the drain plug there was a chip of metal on it.The other day when i was driving i put it in 4-gear and it seemed like it was slowing down?? I'll see tomorrow if the new oil helps it out abit.

[datzenmike]

The drain bung has a magnet on it so metallic 'grit' will collect there. Normally it's a black paste but I did drain one once with a ball bearing on it. :D

 

Synthetic oil protects like 90W but is thin like 10W30 motor oil. Shifting when cold is way better and in warmer weather I found the shifts made a nice click sound into gear. Seemed smoother with less effort. I don't have a noisy tranny so I can't say if it will quiet a whiner. I use it in the trans case and diff.

 

Check the diff oil level, better yet, if you are changing oils change it too.

Edited April 13, 2009 by datzenmike

[sycloned916]

Do i us the same oil in the diff too or find some gl-5.

[datzenmike]

Definitely GL-5. It contains more of an additive to prevent scuffing of the gear surfaces. This additive is not good in trannys because it isn't very compatible with brass synchro rings.

[sycloned916]

Cool thanks.Will go try napa tomorrow.