NP435 Gear Lube ????
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Elder User
Joined: Feb 2000
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From: South Sioux City, NE USA
NP435 Gear Lube ????
I recently put a NP435 from a '78 into my '89 F250. It shifts fairly hard when cold. I filled it with 80w/90w GL5 gear lube when I put it in.
Here is my question: Is there any type of additive that I can put into this tranny to help the shifting when cold? I did not notice this before, but now that the temps are dropping in my neighborhood, the shifting is starting to get a little stiff.
Thanks
Roger Lane
Test Analyst
Sr. Automated Test Engineer
Here is my question: Is there any type of additive that I can put into this tranny to help the shifting when cold? I did not notice this before, but now that the temps are dropping in my neighborhood, the shifting is starting to get a little stiff.
Thanks
Roger Lane
Test Analyst
Sr. Automated Test Engineer
Elder User
Joined: Jun 1999
Posts: 861
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From: SE PA
NP435 Gear Lube ????
Not sure on this, but I don't think the GL-5 is what it needs, I think the GL-3 or 4 is what is used. Not sure where I picked that up at, but the 5 is for newer and/or different bearing/syncros? One option is synth. lube, this should flow better at colder temps. Hopefully, someone else can add a little more info to clairify the GL ratings.
FTE Leadership Emeritus
Joined: Sep 2000
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From: Southern California
NP435 Gear Lube ????
What Chuck said, synthetic.
You might consider this oil:
Gearplus® Super 75W-90
Gearplus® Super-EW 75W-90 and 80W-140
It's a synthetic made by Pennzoil. Says it won't have the stiff shifting like mineral oil.
[link:www.pennzoil.com/prdsmktg/products/yourcar/gearoil.htm|click here]
You might consider this oil:
Gearplus® Super 75W-90
Gearplus® Super-EW 75W-90 and 80W-140
It's a synthetic made by Pennzoil. Says it won't have the stiff shifting like mineral oil.
[link:www.pennzoil.com/prdsmktg/products/yourcar/gearoil.htm|click here]
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Joined: Aug 2000
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NP435 Gear Lube ????
Lanero, that's good advice on the synthetics. They will flow better at low temps, giving you better shifting.
Don't worry about the GL-5 rating. The GL-3 and GL-4's were previously used because they had less extreme pressure (EP) additives, and were easier on the soft metals in the transmissions. The sulphur and phosphorus EP's used in some earlier GL-5's would actually corrode the brass syncros at high temperatures. GL-5's that are on the market today, have buffering agents in them that makes them safe to use.
Don't worry about the GL-5 rating. The GL-3 and GL-4's were previously used because they had less extreme pressure (EP) additives, and were easier on the soft metals in the transmissions. The sulphur and phosphorus EP's used in some earlier GL-5's would actually corrode the brass syncros at high temperatures. GL-5's that are on the market today, have buffering agents in them that makes them safe to use.
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