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Tractor Talk Discussion Forum

Synthetic Gear Oil

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Trkr

09-07-2005 12:58:32




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Have had 50 wt.syn. gear oil in heavy truck trans since new,would like to change to 90 so it will run cooler and quiet gear rattle.Will this hurt anything?Have heard pro and con.




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buickanddeere

09-07-2005 17:08:07




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 Re: Synthetic Gear Oil in reply to Trkr, 09-07-2005 12:58:32  
You have to watch out if it's 50 weight motor oil or 50 wt gear oil. Motor oil and gear oil weights are not the same. 50 to 60 wt motor oil is supposed to be close to 80/90 weight gear lube. Where you will get into trouble is synthetic vs mineral oil. A transmisison can be made smaller and lighter for the same amount of torque if the shear pressure of the oil is increased. When loaded, the mineral oil will be squeezed out allowing metal to metal contact. The GL-5 gear lube uses sulphur based high additives among others. When water from rain or condensation gets in there. Any copper based bushings etc will deteriate. As for weight vs clearances. Properly lubed parts ride on an oil wedge like a surf board on a wave. The narrower the clearances the thinner the oil must be to form a wedge.

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thejdman01

09-07-2005 16:36:13




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 Re: Synthetic Gear Oil in reply to Trkr, 09-07-2005 12:58:32  
do whatever the owners manual says. gears have an engineered gear"backlash" when 2 teeth are in mesh theres a certain engineered amount of "air gap" inbetween the gears that allow oil to get in there which prevents metal on metal contact and shifting and sliding. you never want metal to metal contact always a film of oil. i would not put the thicker oil in there. i had one guy that i did work for bound and determined to put the 90 weight in. i jsut advised to watch the oil very very closely and watch for shavings etc. well its fine cause he ran that in all his trucks for the last 60 years. putting the new tranny in paid very well

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MSM

09-07-2005 13:28:44




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 Re: Synthetic Gear Oil in reply to Trkr, 09-07-2005 12:58:32  
If it's a roadranger,I wouldn't advise it. The 90w will be too stiff,won't get into where it is supposed to when cold,and make shifting very difficult or impossible, especially when the temp.drops.



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Trkr

09-07-2005 15:07:06




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 Syntetic Gear Oil in reply to MSM, 09-07-2005 13:28:44  
Yes its a 15 spd. Roadranger,but prior to it I had a 13 spd used 90 in it for 20 years no problems.Just wondering if the change would hurt it.



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RodinNS

09-07-2005 15:46:28




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 Re: Syntetic Gear Oil in reply to Trkr, 09-07-2005 15:07:06  
I was in just the opposite situation. I had an old 15 with 80W90 which shifted like a dream. The new 13 I have now has Synthetic 50. When I put the wetline on the 13, I changed the oil, but I went with the synthetic 50. I'm just a little nervous about putting 80W90 in a roadranger that's already seen 1.34 km on synthetic 50. This works, it doesn't leak, and I'm never changing it again.
If this is a newer tranny, then it is likely designed for tighter tolerances, and requires the syn50. It should have an oil cooler to deal with the extra heat. Just wait till you price the syn50.... I think mine was about 8 bucks a gallon (Can.) It really smarts when you buy it. FWIW.

Rod

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Trkr

09-08-2005 05:42:35




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 Re: Syntetic Gear Oil in reply to RodinNS, 09-07-2005 15:46:28  
The trans is 10 yrs old and it has a cooler but runs 220-240 degrees.RTX15715



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RodinNS

09-08-2005 15:02:07




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 Re: Syntetic Gear Oil in reply to Trkr, 09-08-2005 05:42:35  
Urrrrr hh...
I'd check to make sure that the gauge is functioning properly. A bad ground or loose wire is nothing new on those things.... Mabey even a bad sender or gauge itself.... I'm not liking those numbers. Ifin it was me, I think I'd keep the floor boards in good repair, so as I wouldn't get hit with the metalic shower when the time comes..... Whines and heat go hand in hand. That old roadranger may soon want to R.I.P. Dunno. Watch the filings on the drain plug. Best of luck.

Rod

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Trkr

09-08-2005 18:23:26




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 Re: Syntetic Gear Oil in reply to RodinNS, 09-08-2005 15:02:07  
Temps right,check it with my thermometer gun.Manual says up to 300 degrees.If it ever got that high I would run away.Manual says use either I just wondered if the change would hurt anything.



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RodinNS

09-08-2005 19:24:53




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 Re: Syntetic Gear Oil in reply to Trkr, 09-08-2005 18:23:26  
If the manual says it's OK, then it probably won't hurt anything. Only concern I would have is the seals. I don't know how they would respond to the change. Somehow, I doubt that it will bring the temp down though. I know that my 13 runs in about the 180-200 range most of the time. Don't know what the old 15 ran. Sender was inop, and not too important.

Time to flip a coin I guess..... .

Rod

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buickanddeere

09-08-2005 19:21:12




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 Re: Syntetic Gear Oil in reply to Trkr, 09-08-2005 18:23:26  
300F is too hot for mineral oil.



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Trkr

09-09-2005 11:55:34




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 Re: Syntetic Gear Oil in reply to buickanddeere, 09-08-2005 19:21:12  
In the manual it said 300 degrees with the syn.



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