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Old 03-21-2011, 05:07 PM   post #1 of 34
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Default ss/15 transmission

Hi MTF users, this may just b a simple task but its my first time doing it so i feel i shold ask first. how would i drain the transmission fluid out of my 1971 ss/15? thank you in advance.
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Old 03-21-2011, 05:13 PM   post #2 of 34
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Default Re: ss/15 transmission

there is a drain plug in the bottom of the trans- has a square head on it. Then re-install that once it's done draining, and take the left rear wheel off, there is an elbow under the fender, pull the plug out of that, and pour 5 qts of 30w non detergent in there. It will take a while
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Old 03-21-2011, 05:38 PM   post #3 of 34
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Default Re: ss/15 transmission

ok, thank you james, sounds fun, but now that u say what type of oil i need, i told the guy at napa i needed 20wt but he sold me some other type of transmission oil, i think i might need to return it....
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Old 03-21-2011, 05:41 PM   post #4 of 34
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Default Re: ss/15 transmission

30 non detergent motor oil
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Old 03-21-2011, 05:52 PM   post #5 of 34
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Default Re: ss/15 transmission

so 30 non detergent motor oil for the motor or transaxle?
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Old 03-21-2011, 09:30 PM   post #6 of 34
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Default Re: ss/15 transmission

You need 30 wt for both, the engin takes 4- pint and the trans takes 5- qt.
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Old 03-22-2011, 11:07 AM   post #7 of 34
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Default Re: ss/15 transmission

ive used lucas gear oil in all my rearends and nothings gone wrong? why the motor oil in the transaxle? and ive worked my transmissions at pulling events getting firewood plowing and nothings gone wrong. and the easiest way ive found is to take the whole elbow off and get the quarts with the "funnel type tip" and just queeze the bottle to force it in the rearend. i usually get done in like 5 mins. if you try the funnel way it will take hours and thats not fun. also lift up the left side so after the 5 quarts are in it wont drip or anything so theres no mess.
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Old 03-22-2011, 11:19 AM   post #8 of 34
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Default Re: ss/15 transmission

I feel gears should get gear oil too,and my SS-12 already had gear oil in it from whoever else had it before me,so I just top it off with more when it needs any--it leaks a bit from the axles and gear oil oozes out a lot slower!..I see no reason to drain it and go back to oil,if any damage was to be had from using gear oil,its too late now!--and that tranny shifts better and ir quieter than my other 2 Suburbans,that have 30W motor oil in them..

Though motor oil is used even in some truck transfer cases,I doubt it protects as well as gear oil,with it having the "EP" (Extreme Pressure) charecteristics needed for spiral cut hypoid gears in car diffs..some say using thicker gear oil will cause excessive wear due to it failing to flow well enough and reach some bearings,or the drive chain in a transfer case,but you cant prove it by me--most of the trucks I had with a full time NP-203 case had gear oil put in by some cluelless "lube tech",but I never had any of them fail or show any other signs of distress from using it..

I cant see how standard trannys and some transfer cases last ,only having ATF for the lube--seems way too thin and not "slippery" enough to me,to let one last,butsomehow they do....

I'm not recomending you disobey the manual's specs for using 30W motor oil in the tranny--but I think gear oil wont hurt one ,personally..might even prolong its life...wont hurt to add some Lucas to the motor oil--I've added some STP Gear Lube Treatment to one tractor I had and it made it shift easier and whine a lot less..
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Old 03-22-2011, 11:47 AM   post #9 of 34
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Default Re: ss/15 transmission

yeah i was going to say that but forgot when i first got my st/12 it whined some but now doesnt at all with the gear oil. and i would think the thicker would be better cause it would climb the gears a lot more and get more to where its needed instead of slipping off. they have a thing at advance autoparts "where I work" that one side is oil and one side is lucas gear oil and the lucas covers the gears in lube and the oil doesnt do it as well very cool representation of the two different lubes.
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Old 03-22-2011, 11:54 AM   post #10 of 34
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Default Re: ss/15 transmission

30 sae non detergent is what the service manual calls for. I do agree with Jeff, & tractor-Holic that you would think it would take gear oil. But the book says different.
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Old 03-22-2011, 03:26 PM   post #11 of 34
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Default Re: ss/15 transmission

ok, well thank you all, some guy at school was telling me i could use gear oil to, but Hugh-ss/16 told me to use the 30 wt motor oil. i guess i'll use whichever i find first at the store or does anyone know which is better? it sounds liek they both do the same job but just that some people like one better than the other. thank you

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Old 03-22-2011, 09:06 PM   post #12 of 34
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Default Re: ss/15 transmission

this mod helps too, the fill extenstion on the left side of the hitch plate, especially if the axle seals leak. mine are all running 30wt
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Old 03-22-2011, 10:15 PM   post #13 of 34
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Default Re: ss/15 transmission

From what I understand, you need to use SAE 30 in the engine and SAE 30 Non-Detergent in the transaxle. The non-detergent oil is typically used for wiping stuff down with oil, gears, and oil can type oiling. My manual for my ST16 says to use SAE 30 Non-Detergent MM or MS oil in the transaxle. Sears.com has a case of Master Mechanic brand for about $50 plus shipping.
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Old 03-23-2011, 11:28 AM   post #14 of 34
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Default Re: ss/15 transmission

I can get 30W non-detergent for 1.99 a qt. at "Benny's" store nearby....it says on the can "NOT for use in any vehicle made after 1932"--its a straight mineral oil,probably fine for oiling hinges and maybe our Suburban trannys--but I feel gear oil protects a lot better..it certainly wont hurt to add a qt. of gear oil or a additive like Lucas or similar gear treatments to the 30W oil ,in any case..

I've seen those counter displays that show how two gears running in a pool of regular oil VS the ones with Lucas behave,it is evident the Lucas "climbs" up the gears when regular oil sits at the bottom mostly...BTW--Lucas used to be sold under the brand name "Hi-Tach" ,I remember seeing that plastic counter display being labeled as "Hi-Tach" oil additive...

Just about ANY oil is better than whats in most of our old tractors--every one I've bought and drained out had either hardly any oil IN them (like 1-2 qts instead of 5!)--and most had oil that looked like old mayonaise it was so full of condensation,and posessed very little "lubrication"...how the gears inside look I dont know,I'm afraid to look,I wouldn't doubt there is some rusty bearings and shafts in them all...surprises me how they held up for 40 years with only that swill in them for "lube"!...
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Old 03-23-2011, 11:40 AM   post #15 of 34
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Default Re: ss/15 transmission

I heard that, mine was milky as heck. I used Penzoil to put back in it.
Floyd
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