| Author | Message | ||
| Grant Thiessen (Busshawg)
Registered Member Username: Busshawg Post Number: 175 Registered: 10-2007 Posted From: 206.45.93.160  Rating: N/A |
I finally dumped all of my fluids. I noticed in the achives that some of you are running 40 weight in your transmissions. I am a little reluctant to run it. Maybe I'm old school but would a 80/90 gear oil work in my transmission? Want to buy oil this pm and get it done. What are you guys running in your 5 spd manual transmissions, 1984 MC9 Thanks | ||
| Tim Brandt (Timb)
Registered Member Username: Timb Post Number: 346 Registered: 10-2003 Posted From: 66.165.176.62  Rating: N/A |
40 wt is what is spec'd in the service manual for my spicer. Gear oil is for the diff. Remember if it's too thick like on a cold morning it's not going to be getting lube where it should. | ||
| Grant Thiessen (Busshawg)
Registered Member Username: Busshawg Post Number: 176 Registered: 10-2007 Posted From: 206.45.93.160 Rating: N/A |
Thanks Tim. I was a little confused as I ran 80/90 in my hiway tractor when I was on the road. I had over 3 million miles on it and only rebearinged it once. I'll go with 40 weight motor oil then, the same as what I run in the engine, thanks | ||
| Tim Brandt (Timb)
Registered Member Username: Timb Post Number: 347 Registered: 10-2003 Posted From: 66.165.176.62 Rating: N/A |
What trans do you have? I can try and find the spec for you if you want. Mine is a spicer 6000 series others may differ in their lube requirements like your truck did (Message edited by timb on June 03, 2009) | ||
| Grant Thiessen (Busshawg)
Registered Member Username: Busshawg Post Number: 178 Registered: 10-2007 Posted From: 206.45.93.160 Rating: N/A |
ha ha I don't know. It's a 5 spd standard transmission. Suppose it's stamped somewhere on the transmission. | ||
| Larry Nelson (Larryn4106)
Registered Member Username: Larryn4106 Post Number: 34 Registered: 8-2008 Posted From: 173.30.230.77 Rating: N/A |
My spicer takes 40wt and I mix in a couple of quarts of Mobil 1. | ||
| Gus Causbie (Gusc)
Registered Member Username: Gusc Post Number: 920 Registered: 11-2005 Posted From: 208.54.200.10  Rating: N/A |
Don't know about the newer Spicers but the old ones like in my 4104 call for 50wt "Aircraft grade" oil. This is expensive stuff and if you use it be sure to get Mineral Oil which is used for aircraft engine break-in only. I use it because I happened to have a few cases I bought by mistake for my airplane. I think any 50 wt oil will work, this is not an extreme pressure application. However, I see no reason 40wt won't work fine, mine had 30wt in it when I got it. I plan to go back to 40wt when this runs out. The reason 90wt is too heavy is that these old Spicers have an oil pump to circulate the oil, probably for cooling, so 90wt is too thick for the pump. | ||
| FAST FRED (Fast_fred)
Registered Member Username: Fast_fred Post Number: 815 Registered: 10-2006 Posted From: 76.216.69.160 Rating: N/A |
When using engine oil was std for many GM's Da Book required 30 wt in the engine , the change to what is now std 40wt, came later. FF | ||
| Frank Radosti (Frank4104)
Registered Member Username: Frank4104 Post Number: 30 Registered: 8-2006 Posted From: 64.80.137.250  Rating: N/A |
I run ep 90 In my 4104 since its rebuild w/out any problems(spicer 4 speed) | ||
| Grant Thiessen (Busshawg)
Registered Member Username: Busshawg Post Number: 179 Registered: 10-2007 Posted From: 206.45.93.160 Rating: N/A |
well I did the change last night, I put in straight 40 weight engine oil. Thanks for all your help, it was a huge help. I would of ended up putting 80/90 gear oil in. Thanks again | ||
| Cullen Newsom (Cullennewsom)
Registered Member Username: Cullennewsom Post Number: 53 Registered: 2-2009 Posted From: 98.201.161.214 Rating: N/A |
If it shifts easily while underway, you're probably Ok. I've run SAE 50 in Muncie 4 Speeds and Borg Warner T-5's where they called for 80W90. Of course that's a different ball of wax. However, I wouldn't be as surprised to learn that your bus transmission used 40 Wt oil as I was to learn that some Fords use ATF in their manual transmissions or that Dodge Cummins' with 6 speed use 5W30. If you can't determine which fluid is the proper one. Make your best guess, and monitor it closely for a while. Check the temperature after pulling a hill, or check it after a long run. I'm not normally a fan of magic potions but I do like Lucas for old things with gears in them. It doesn't take much. One caveat, if your trans has brass synchronizers (if it has synchros they are probably brass), you may want actual gear lube, (which contains a corrosion inhibitor, or so I have read on the internet). | ||
| Grant Thiessen (Busshawg)
Registered Member Username: Busshawg Post Number: 181 Registered: 10-2007 Posted From: 206.45.93.160 Rating: N/A |
Thanks Cullen , I used Lucas in my hiway tractor years ago and liked it mabey I'll drain a little and add a quart or so of Lucas grant | ||
| David Lower (Dave_l)
Registered Member Username: Dave_l Post Number: 157 Registered: 11-2007 Posted From: 67.58.201.132  Rating: N/A |
Grant it is a 40wt oil or 50w if the air temp is above 80F. I just called the mci tech suport line to get this. Dave L Do you work at Gardwine North? | ||
| marvin pack (Gomer)
Registered Member Username: Gomer Post Number: 507 Registered: 3-2007 Posted From: 71.55.197.237  Rating: N/A |
hey gents,don't want to upset the apple cart but, I must say to all bus nuts is to always use SYNTHETIC OIL except in the engine. It will also make it be much smoother operating and cooler in temps. I hope that you will consider this on the next change out. gomer | ||
| Kasse Weikel (More_s_than_as)
Registered Member Username: More_s_than_as Post Number: 46 Registered: 4-2009 Posted From: 24.205.97.163 Rating: N/A |
what about for my allison 4 speed automatic????i have the manual that mac sent me but it just gives an address for allison and says to call em LOL! and as mentioned before the manual also says 30 weight for engine and i seen in the archives the recent chevron documents saying that 40 wieght cf2 is the thing for my detroit so any new tid bits on the allisons? what should i be dumping in there? adding lucas to the autos is good idea too? i seen the little test displays at kragen where u turn the handle and u watch the little plastic gears spin, one side has lucas and the other doesnt, and my my the lucas side is all over the gears, the other stuff just runs off quickly. oh and BTW teh manual does specify that use of 40 weight is recommended in high temps, 30 in normal, and 20 at low temps. so now that 40 weight is the regular temp recommended weight, using 30 would be disastrous??? cause i can get the delo 30W cf2 at walmart here, i cant find 40W locally maybe a marine shop would have it though. plz help me make by bus last longer than i do! | ||
| Cullen Newsom (Cullennewsom)
Registered Member Username: Cullennewsom Post Number: 68 Registered: 2-2009 Posted From: 98.201.161.214 Rating: N/A |
Kasse, no I wouldn't put Lucas in an automatic. I don't think Lucas recommends that either. But, I wouldn't either way. Old things with gears, that's it. The only downside I see to Lucas in those applications is that loose pieces of metal might fall to the bottom more slowly, or they might get circulated more easily, instead of resting at the bottom. Magnets are good at dealing with loose metal. | ||
| john w. roan (Chessie4905)
Registered Member Username: Chessie4905 Post Number: 1501 Registered: 10-2003 Posted From: 71.58.110.9  Rating: N/A |
GM's latest version of Dexron is almost synthetic now and can be used in all previous applications. 90 weight will probably be ok in that 4104 till you get somewhere where the overnight temperature dips into the teens or twenties. | ||
| Debbie and Joe Cannarozzi (Joe_camper)
Registered Member Username: Joe_camper Post Number: 173 Registered: 10-2006 Posted From: 71.239.202.82 Rating: N/A |
If you have not put full-synthetic lubricant in it you have chosen a compromise. Aside from the crankcase for the DD 2-stroke, I run that in every other cavity including my trans. I remember way back when syn. oil first came our and I also remember that first truck I drove using it. There is a huge difference in performance and protection and I will never go back | ||
| FAST FRED (Fast_fred)
Registered Member Username: Fast_fred Post Number: 821 Registered: 10-2006 Posted From: 76.195.79.226 Rating: N/A |
"There is a huge difference in performance and protection and I will never go back" The synthetic is better at thin film and sheer (shifting there is less wear if you miss), but it is far worse at anti-rusting. In a tranny or rear its probably not a problem , and in the 200,000 mile a year trucks its fine. But for an engine that might not see use from month to month , its not a great idea. The reason is it drains so well that the metal surfaces are not oil covered , after a few days. FF |