FrankWest107 Posted July 30, 2016 Share Posted July 30, 2016 Mac's sells 600W..I have been told this is 140 wt? I have a 1933 ford that has no syncro in 1st and reverse. So I need heavy oil to facilitate shifting into these gears. HELP... My 1933 owners manual says to use sae 250 in summer and sae 110 in winter. Link to comment Share on other sites More sharing options...
Guest Grumpy's Auto Shop Posted July 30, 2016 Share Posted July 30, 2016 Do you have any idea what is in the gearbox currently? AFAIK 600w should be the correct spec fluid, but you may have other issues. Link to comment Share on other sites More sharing options...
FrankWest107 Posted July 30, 2016 Author Share Posted July 30, 2016 80 with MMO added for cleaning Link to comment Share on other sites More sharing options...
Guest Grumpy's Auto Shop Posted July 30, 2016 Share Posted July 30, 2016 Mmmm... Definitely too thin. Maybe you could get away with it by adding Lucas to make it stickier, but why bother? More than worrying about formulation, it is the WEIGHT that matters most. Anything below 100w is probably going to have noticeable issues. And remember that when the Manual was written there were no Multi-Viscosity oils. (Also, are you really going to drive it in the Winter? (Sure, a person would in the '30s, but today, not so much). Link to comment Share on other sites More sharing options...
FrankWest107 Posted July 30, 2016 Author Share Posted July 30, 2016 I drained out the 80 with MMO and added just added the 80 gear oil I have and noticed that I shifting into 1st was much nicer..I guess with heavy oil 1st gear stops spinning and is easier to get into. I ordered 600 w from Mac's...Is that really 140w and not 250 w. You are right I will be doing most driving in the hot weather so I want to add the nheavest oil I can get. Link to comment Share on other sites More sharing options...
Willie Wurke Posted July 31, 2016 Share Posted July 31, 2016 NO MANUFACTURER EVER PUT A SYNCHRONIZER ON REVERSE. the only company to put a synchronized low in a 3 speed transmission was Ford in the early 60's' It's useless unless your driving requires you to use low as a "driving" gear where you shift from 2 nd to !st on the fly. I would think you would want second and high synchronized. Ford didn't do that until 1935. I suggest you fill the transmission to the proper level with 140 w. gear oil. Link to comment Share on other sites More sharing options...
cahartley Posted July 31, 2016 Share Posted July 31, 2016 I don't know where the 600 oil is really 140 or something else comes from. 600 oil at 70º F is STILL like molasses....... Link to comment Share on other sites More sharing options...
Grimy Posted July 31, 2016 Share Posted July 31, 2016 True 600-W is very dark, smelly and very viscous--this is what I use in non-synchronized transmissions and non-hypoid differentials. However, some vendors represent a honey-colored, lighter-weight oil as "600-W" but I suspect the honey-colored offerings are merely re-packaged SAE-140 gear oil. I've read that the true 600-W is about SAE 180 to 200, but can't tell you where I saw it--Skinned Knuckles? I've used up the last of my Texaco Thuban SAE 250 gear oil (is it still available?) which to me (based on it taking a few minutes to permit easy shifting in 70 degree weather) seems heavier than 600-W. Link to comment Share on other sites More sharing options...
maok Posted July 31, 2016 Share Posted July 31, 2016 I use the Penrite Transoil 250 as well. I find that it needs to warm up before it will change up to 2nd and then 3rd without crunching. Link to comment Share on other sites More sharing options...
Spinneyhill Posted July 31, 2016 Share Posted July 31, 2016 A major part of the misunderstandings in oil is the habit of calling an oil 600W when it is NOT. I expect it is really an oil of kinematic viscosity 600 cSt at 40 deg. C. The Capital W is an SAE rating tool so should not be used for anything else. It refers to how the oil performs at low temperatures. Look up oil viscosity comparison charts (e.g. www.Bobistheoilguy.com). You will see that 600 cSt kinematic viscosity at 40 deg. C correlates with SAE 140 gear oil and is probably close to ISO 600. "Weight" is not involved. It would be far better if we all used ONLY SAE viscosity ratings, then there would be no confusion like always arises when we discuss oil. Link to comment Share on other sites More sharing options...
FrankWest107 Posted August 1, 2016 Author Share Posted August 1, 2016 Is it ok to put STP oil additive in these 1933 transmissions Link to comment Share on other sites More sharing options...
Spinneyhill Posted August 1, 2016 Share Posted August 1, 2016 Why? It is a viscosity enhancer so why bother? Just use an oil of the viscosity you want. I would be very careful; it may have things in it that are not good for the bronze bushes in the transmission. The MSDS may tell you whether it does or not: look for the copper strip corrosion test. Link to comment Share on other sites More sharing options...
Recommended Posts
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!
Register a new accountSign in
Already have an account? Sign in here.
Sign In Now