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Oct 22, 2009 | 04:01 PM

Catch86

Thread Starter

New User

Joined: Sep 2009

Posts: 8

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Need help

Just bought a 1991 F700 dump truck. Manual Shift.
Have truck shop manual, It says to use SAE-50 Engine Oil.
Is that right? NOT gear oil.

Oct 22, 2009 | 06:30 PM

jpr38057

Elder User

Joined: Nov 2004

Posts: 614

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From: Fort Wayne IN

Use 50w gear oil

Oct 22, 2009 | 07:13 PM

nevrenufhp

Cargo Master

Joined: Feb 2003

Posts: 2,341

Likes: 5

From: Sacramento

Yep, lotsa newer manual trannies use a lighter oil instead of old skool gear oil.

Oct 22, 2009 | 09:51 PM

dirtydoyal

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Joined: Oct 2009

Posts: 7

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they used both synthetic 50w oil and regular gear oil in most of the man trans. for the rear had 80w . either works just don't mix them if u do it mixes into a thick jelly

Oct 23, 2009 | 08:28 AM

krewat

FTE Leadership Emeritus

Joined: Jul 2002

Posts: 42,561

Likes: 418

From: Long Island USA

Even the 435NP in my '74 highboy called for 50W. They've been using that stuff for a long long time.

Oct 24, 2009 | 05:57 PM

rbaker6336

Post Fiend

Joined: Feb 2007

Posts: 7,191

Likes: 4

From: Blairsville,Ga

In the late '60s they came with ATF in them

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