tranny and rear end fluids...

layedout72 · Post by **layedout72** » Sat Jun 16, 2007 7:50 am

I have (what I believe to be) an NP435 3 speed tranny, and ( i know ) a Ford 9 inch. What fluids should I buy to put in the tranny? Also, to do the rear end?

averagef250 · Post by **averagef250** » Sat Jun 16, 2007 12:20 pm

80/90 gear oil. early ford manuals say 50 wt motor oil. Motor oil will kill a 435 in time though.

layedout72 · Post by **layedout72** » Mon Jun 25, 2007 10:52 am

so 80/90 for the rear, but what tranny fluid is the 50w motor oil will kill it?

averagef250 · Post by **averagef250** » Mon Jun 25, 2007 12:15 pm

use 80/90 in both.

MadMaxetc · Post by **MadMaxetc** » Mon Jun 25, 2007 12:28 pm

how much do I put in a 9" ? 5.5qts? is that right?

layedout72 · Post by **layedout72** » Mon Jul 16, 2007 8:55 pm

bump this back up for a couple new questions. how much fluid does the rear end need, and how much fluid does the tranny need? where do I fill both of them? I am guessing I can seal the rear end with RTV? am i thinking wrong here? where do I fill the tranny? Through the cover that is bolted down?

layedout72 · Post by **layedout72** » Tue Jul 17, 2007 10:56 am

anyone?

MadMaxetc · Post by **MadMaxetc** » Tue Jul 17, 2007 1:19 pm

the 9" uses 5.5qts. I used RTV on mine, and no leeks yet. I filled mine using the vent fitting hole where the brake hose splits.

layedout72 · Post by **layedout72** » Tue Jul 17, 2007 1:34 pm

thanks a lot. maybe i can get at least that done this after noon! I think I bought 7 quarts.

ToughOldFord · Post by **ToughOldFord** » Tue Jul 17, 2007 2:06 pm

On the side of the transmission there are two plugs. The one near the bottom is the drain plug, the one that's right about half way up it the fill plug. You remove the fill plug and add fluid until it starts to come out the hole, then you put the plug back in.

The 9" rear has no drain plug, but it does have a fill plug. IIRC it's on the left (driver's) side of the housing on the drive shaft side and you use a 3/8' ratchet to pull the plug. Fill the same way as you would the tranny.

layedout72 · Post by **layedout72** » Tue Jul 17, 2007 8:45 pm

okay, this is what I see.

upper part of the tranny, towards the rear there is a "3" i guess because its a 3 speed. under that, a square headed threaded plug, pointing slightly upward, and then at the bottom of the tranny, where it meets the back end, and there are 5 bolts maybe 6, the bottom one may be the drain. I dont have two "plugs" that I can find though.

ToughOldFord · Post by **ToughOldFord** » Tue Jul 17, 2007 9:32 pm

The square headed plug is your fill plug.

layedout72 · Post by **layedout72** » Wed Jul 18, 2007 6:10 am

what is the drain plug though? I dont see another plug on the side of the tranny?

71 LONG BED · Post by **71 LONG BED** » Wed Jul 18, 2007 6:25 am

layedout72 wrote:I have (what I believe to be) an NP435 3 speed tranny...

Are you sure it's an NP435? Those are 4 speeds, not 3.
If it is a "3 on the tree" it is a 3.03 trans.

layedout72 · Post by **layedout72** » Wed Jul 18, 2007 8:40 am

well, i swear i was told it was an NP435, but reguardless, is 80/90 gear oil what I need? and where do I drain from?

The FORDification.com Forums

tranny and rear end fluids...

tranny and rear end fluids...

re: tranny and rear end fluids...

re: tranny and rear end fluids...

re: tranny and rear end fluids...

re: tranny and rear end fluids...

re: tranny and rear end fluids...

re: tranny and rear end fluids...

re: tranny and rear end fluids...

re: tranny and rear end fluids...

re: tranny and rear end fluids...

re: tranny and rear end fluids...