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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
June 7th, 2020, 06:22 PM
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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
June 9th, 2020, 12:26 AM
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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
June 9th, 2020, 03:39 AM
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Re: Tranny And Diff
Thanks James appreciate the response. JF
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#4
June 9th, 2020, 06:00 AM
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Re: Tranny And Diff
Remember that lubricants are vastly superior today as they were when those specs were written.
Sent from my moto g(6) using Tapatalk
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#5
June 9th, 2020, 06:05 PM
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Re: Tranny And Diff
Hey Dude , soooo what would you recommend ?? Thanks to all JF
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#6
June 9th, 2020, 10:22 PM
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Re: Tranny And Diff
For casual drivers, I replace gear oil every other year.
__________________
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, still looking for an oldsmobile style power steering pump
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#7
June 10th, 2020, 03:21 AM
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Re: Tranny And Diff
I am using Valvoline 80w90 not conventional, every other year good?? JF thanks tbucketnut
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#8
June 10th, 2020, 03:22 AM
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Re: Tranny And Diff
meant not synthetic CORRECTION JF
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#9
June 16th, 2020, 05:24 AM
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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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#10
December 7th, 2021, 06:07 PM
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Re: Tranny And Diff
Since I found several places with very different capacities for the Muncie SM420 on my 1960 1500, I figured I would add one more.
Started with old oil just below fill hole and drained about 3/4 of a gallon jug . I filled to the drain/fill hole through the shifter neck (since it was already off and much easier) with exactly 3 quarts. At the current price of $10/ quart, it is nice not to buy extra.
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