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73-87 Chevy _ GMC Trucks => Engine/Drivetrain => Topic started by: misweetrevenge on May 02, 2014, 04:15:50 pm

Title: NP203 Only Took 3 Qts
Post by: misweetrevenge on May 02, 2014, 04:15:50 pm

So from what I read before I drained my 203, you drain it from one of the 2 bottom bolts on the same side as the fill plug and then it takes 5 quarts to fill to the bottom of the fill hole.

I drained it until it stopped coming out of the bolt hole and started to fill it but it only took 3 quarts and then started flowing out of the fill hole. Am I supposed to drive it a little and then top it off? Or should it take the full 5 right away? Did it drain completely?

Title: Re: NP203 Only Took 3 Qts
Post by: thirsty on May 02, 2014, 05:21:28 pm

I think it should be around 5 pints not 5 quarts. ;)

Title: Re: NP203 Only Took 3 Qts
Post by: misweetrevenge on May 02, 2014, 08:56:37 pm

That would make more sense haha

Title: Re: NP203 Only Took 3 Qts
Post by: rich weyand on May 02, 2014, 11:32:48 pm

And you filled it with 30W oil, not gear lube, right?

Title: Re: NP203 Only Took 3 Qts
Post by: misweetrevenge on May 03, 2014, 02:43:29 am

Quote from: rich weyand on May 02, 2014, 11:32:48 pm

And you filled it with 30W oil, not gear lube, right?

Correct. 10-30

Title: Re: NP203 Only Took 3 Qts
Post by: rich weyand on May 03, 2014, 12:12:50 pm

That'll work.

In order to keep the gravity reservoir filled for the rear output shaft bearing when the hubs are FREE, shift it into HI LOC when you drive it the first time every day.  After a couple miles, shift it into HI, which you can do on the fly.  That will keep you from running that bearing dry.  If the hubs are in LOCK (like in the winter), then there's no need, because the internals on the NP203 are being driven from the other end.