NP435 fluid

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Sep 13, 2002 | 11:12 AM

liljpy

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Joined: Jul 2002

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From: midwest

NP435 fluid

OK, question, i just got done rebuilding an NP435 4spd. I went to autozone to buy some gear oil to refill the case. The guy said they don't carry it there and that it is a special dealer only item!! I personally think he is smoking crack. I misplaced my Haynes manual and i think it said something about 100 weight oil, but am not sure. What is some good fluid for my rebuilt beast?

Sep 13, 2002 | 01:34 PM

lanero

Elder User

Joined: Feb 2000

Posts: 601

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From: South Sioux City, NE USA

NP435 fluid

80W/90 GL5 rated gear lube should do the trick.

Roger Lane

Sep 14, 2002 | 03:26 PM

redranger1

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Joined: Dec 2001

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From: Iberia, USA

NP435 fluid

special order item only??? :-X23 yep, hes on somethin.

-nathan

Oct 6, 2002 | 09:53 PM

oldroady

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Joined: Aug 2002

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NP435 fluid

good question,iv'e got a 65 w/ np 435. factory shop manuals say 50 wt.i said "what?"

Oct 6, 2002 | 11:02 PM

kspilkinton

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Joined: Jul 2001

Posts: 4,038

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From: South Kitsap County, WA

NP435 fluid

Older units will have different requirements. I don't recall when multi-viscosity oils appeared, but the 50W may have been what was used years ago. I've heard of it used in NP205 cases. It's about the scientific approach of keeping the inserts and metals happy without having to worry about wear.

If you haven't rebuilt the older unit, it may not be a good idea to change over to a different oil weight. The inserts and other components may not respond well to the higher base weight and chemical properties (detergents). With a rebuilt unit I'd use a 75 and up base oil. I ran 80W-90 in my NP 435's ('73 & '82) without a problem, and had an aquaintance that ran 75W-140 in his.

-Kerry

Oct 7, 2002 | 12:26 PM

Brian

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Joined: Jun 1999

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NP435 fluid

The 72 manual recommends 50 wt also. Using the heavier weight in a mild climate area will probably not make a difference. If you live where it gets cold the shifting can be harder with the higher viscosity.

20 years ago I had a mustang 5 speed that I installed and ran gear lub in. It never shifted right until I found out it was supposed to use automatic trans fluid. It shift fine after that. I did blow it up shortly there after though.

Oct 12, 2002 | 09:00 PM

rebocardo

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Joined: Jun 2002

Posts: 13,873

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From: Atlanta GA

NP435 fluid

I have been running 85/140 in my 435, but, only have about 1000 miles on it so far and the weather is nice here. My biggest problem was getting the gear oil in! What I did was remove the tranmission cover, put a flexible funnel into the fill hole and fill it from above while I did other work on the truck. Took forever!