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Transmissions and Rear Ends Three on the tree or four in the floor? Shift it all here.

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  #1  
Old June 7th, 2020, 05:22 PM
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jmfurgason jmfurgason is offline
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Default Tranny And Diff

How often should gear oil be changed on sm420 and 44 Dana . Just a Sunday driver ? Thanks be well be safe . JF
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  #2  
Old June 8th, 2020, 11:26 PM
James James is offline
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Default Re: Tranny And Diff

SM420 or the Dana 44 - Maintenance Manual says check every 1,000 miles, drain and refill every 10,000 miles.
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  #3  
Old June 9th, 2020, 02:39 AM
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jmfurgason jmfurgason is offline
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Default Re: Tranny And Diff

Thanks James appreciate the response. JF
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  #4  
Old June 9th, 2020, 05:00 AM
GMC_Dude GMC_Dude is offline
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Default Re: Tranny And Diff

Remember that lubricants are vastly superior today as they were when those specs were written.

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  #5  
Old June 9th, 2020, 05:05 PM
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Default Re: Tranny And Diff

Hey Dude , soooo what would you recommend ?? Thanks to all JF
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  #6  
Old June 9th, 2020, 09:22 PM
tbucketnut tbucketnut is offline
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Default Re: Tranny And Diff

For casual drivers, I replace gear oil every other year.
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Steve Stock
Gig Harbor, Wa

1953 Chevrolet 3100
261 cu inch, SM420
Finished Cab off restoration

1964 GMC 1000
305 V6, SM 420
Restoration is now started
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  #7  
Old June 10th, 2020, 02:21 AM
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Default Re: Tranny And Diff

I am using Valvoline 80w90 not conventional, every other year good?? JF thanks tbucketnut
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Old June 10th, 2020, 02:22 AM
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Default Re: Tranny And Diff

meant not synthetic CORRECTION JF
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  #9  
Old June 16th, 2020, 04:24 AM
thenonoman thenonoman is offline
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Default Re: Tranny And Diff

I just replaced what seems to be the original oil in the diff on my 65. I suggest a little more often than that. It was sludge-tastic. I expect to find the same in the trans.
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