I just changed the oil in the front and rear diffs, in the front I found several small chunks of gear, less than an 1/8th of an inch. Not much stuff on the magnet. Should I be worried about that?

In the rear everything looked fine. oil looked burntish gold still

I was doing some research here before doing this, and I must have got my info mixed up. I used 85w-140 per my grandpas recommendation in the front and rear.

I just looked at the book and it says for 2003 and newer use synthetic 75-90, how important is this? can I drive it two more days before I change it, if i need to? this is the first time I ever changed the oil in the diffs of any truck I have owned I knew I was going to mess something up!

 

If it was me "yes" I would be worried, if you keep it in 2 wheel drive it wont hurt, but I would be thinking about changing out the ring and pinion, and yes I would replace the set, If you miss match gears you will get a whine. And I always use synthetic gear lube. theres a lot of heat generated in the diff`s especially the rear, as it is used all the time. good luck

 

Fiftygrit pretty much nailed it.

I would drain the front diff and also get a can of brake parts cleaner to spray it clean real good. Lift the front off the ground so you can spin the driveshaft (use jack stands ) and take a bright light and inspect it very closely. It may also be some diff casting and not gears. probably gears though but lets hope it's not.

You can drive a few days on the rear fluid before changing to synthetic with out any problems!

 

is that synthetic 75 - 90 recommended for 2 wd also and how much does one take

 

Yes.

4 Qts will be enough. It is 3.?? actual quarts. If you have your owners manual it should say in there.

 

thank ya

 

any brand any better than others on the gear oil like lucas or amsoil or just local auto parts store. and a little off subject but i just had my nv5600 rebuilt got any good ideas on fluid to put back in it i just got it back today and waiting for clutch to arrive and wondering what best fluid to put back in it

 

I use Mobil1 75w90

 

Same, except I use 140 in the rear. I've tried several different brands, but Mobile1 is the only brand that doesn't make my rear end chatter.

 

For the NV5600 I use Pennzoil Sycromesh Trans fluid. This is what the factory fill was.