What kind of ATF?
- Thread starter worshhim
- Start date
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The Amsoil version of Transynd.
x2 on the Amsoil. My truck was fortunate to have Amsoil fluids throughout since 30k and have had no major problems and i'm currently at 165k. i know i know, 165k is still relatively low!
Priate Dave, Dunbar here on Mud, would suggest that since a used tranny isn't going to last very long anyway, might as well stick with the cheapest clean, fresh ATF you can find. It's just his experience since he went through two used A440Fs in short order before installing an H55F. I hope your experience is better worshhim.
Would it be really BAD if you put 90 wt in? 
Would it be really BAD if you put 90 wt in?
You are kidding I hope. 90wt is for manuals and t-cases and diffs. I don't know what you should do to get the 90wt out.
fortunately, i DON'T have 90 wt in my transmission : )
But the question came up the other day about what type of ATF to use in an A440F
A buddy (with a 4 speed manual) mentioned that he uses 90 wt and that it would be fine in the A440F.
I was SURE that was not right, but not sure what would happen if it was put in.
But the question came up the other day about what type of ATF to use in an A440F
A buddy (with a 4 speed manual) mentioned that he uses 90 wt and that it would be fine in the A440F.
I was SURE that was not right, but not sure what would happen if it was put in.
Cruiserdrew
On the way there
Any ATF is going to work fine as long as it's Dex compatable. The Chevron MD-3 ATF from Costco is excellent stuff and it's cheap enough to do a drain/fill every 6 months. There is no reason to put synthetic ATF in a high miles 20 year old tranny.
If yours is a fresh rebuild, then Mobil1 ATF would be my choice.
If yours is a fresh rebuild, then Mobil1 ATF would be my choice.
except that it'll run measurably cooler and smoother, and it's heat the kills them
- Thread starter
- #13
So I CAN run synthetic in a high mileage used tranny without causing leaks? Thats my main concern. I will run synthetic if it won't make things leak like my 91 mini did when I added synthetic.
Mine has 150K and doesn't leak a drop.
synthetics do Not CAUSE leaks...
Cruiserdrew
On the way there
And I am not claiming they do. For me, a high mileage tranny (or motor for that matter) already has most of the wear cycle completed, and the amount of wear to prevent just isn't there. Thus no reason to spend money on synthetics. Yet I do run 5w-40 Rotella syn in my 60 during the winter months, just to get the low temp start advantage. The rest of the year it runs on Conventional Delo.
I totally agree that bad seals cause leaks not the synthetic lube. A new car, or a new motor/tranny would benifit from synthetics over the course of it's long life.
- Thread starter
- #17
They do...in some circumstances. I had a 91 Toyota 4x4. Ran regular oil from the day I bought it (NEVER HAD ANY LEAKS...NONE), then i was convinced that synthetic would make it run a little better...sooooo...I did an oil change, added synthetic and within a week I had leaks everywhere. I did some research and found that the texture difference between synthetic oil and regular oil can cause leaks in high mileage engine because the gaskets for some reason shrink or something.
I got some valvoline synthetic ATF4 from Napa. It is way cheaper than Mobil 1, and I'm sure it is 99% as good.
