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10-22-2009, 04:01 PM

Catch86

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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.

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10-22-2009, 06:30 PM

jpr38057

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Use 50w gear oil

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10-22-2009, 07:13 PM

nevrenufhp

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

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10-22-2009, 09:51 PM

dirtydoyal

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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

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10-23-2009, 08:28 AM

krewat

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

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10-24-2009, 05:57 PM

rbaker6336

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

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