30 wt. oil in manual trans?

[69roadr]

have a talk to jamie from passon performance or the guys at brewers.
passon has a special oil for there boxes, he told me the exact equivalent of it was a mix of atf and 85w-90.
he said 85w90 is too thick on its own and will sometimes cause shifting hardness, and atf was too thin to protect properly, so he said put 1 qt of atf in then fill the rest up with 85w-90, my box never shifted so smooth and when i freshened it up recently it was so clean i didnt need to touch it.

but ask the pro's if you dont believe me.

i am going to try your method benno440. is that what you put in your 68 Charger? Sounds like a good combination of thin and thick to get the gears moving freely : )

 

[RustyRatRod]

My 72 FSM calls for either gear lube or ATF in the 833

You can lead a horse to water.............

 

[benno440]

i am going to try your method benno440. is that what you put in your 68 Charger? Sounds like a good combination of thin and thick to get the gears moving freely : )

sure did buddy, works well, i used castrol gear oil and castrol atf might be better brands out there but this works for me.

 

[Cornpatch MO]

Brewers recommended to me to use 80-90 gear oil that had a certain specification. Don't remember just what it was , but not commonly found at local vendors. If someone wants to know, I will go out in the cold shop and look it up. 8-) ................MO

 

[Cranky]

A 74 Dodge D100 pickup I owned back then came with ATF in it. After messing up a rear bearing, I went to gear oil. Shifting was harder in cold weather but we don't get that much cold here so it acted fine during the warmer months. Yeah, I was pulling a heavy load with a light duty truck but no more problems after that and I continued to abuse the truck. Also, I wouldn't have any problem with adding some ATF to the gear oil to reduce the viscosity and I've heard that even just a half a quart will work too and it's also supposed to help reduce foaming of gear oil.

 

[RustyRatRod]

If you don't like the ATF idea and want to use gear oil, just switch to 75/140 synthetic. It's really not critical. All that matters is it has SOME kinda oil in it.

 

[Lowhound]

Dont know if it matters in my case but I tried 10w 30 in my Ford Ranger & ran it for years with no problems. But it was recommeded & came with ATF from the factory.A friend recommended to me & I gave it a try only after he said that he had done the same thing. As for mixing different products Im not so sure about that.

 

[RustyRatRod]

My only concern with mixin stuff would be creating foam. That would suck. Course, if Jamie Passon recommends somethin, it's probably a green light cause that guy is top notch. Really in the end, just do what works for you and be did wif all dat, yo. <with my arms crossed in my best homey stance flashin gangsta signs>

 

[62MAX]

Everyone that sells transmission's/parts seems to know more than the engineers that designed this stuff !:icon_rolleyes:

 

[Photon440]

From the 1970 shop manual:

 

[thebear101]

I'm thinking that you should take it back to a proper transmission dealer, have it fixed right, (80-90 gear oil) than have the person that fixed the transmission to a meer disaster pay for it