I recently installed a 833 in my 65 dart, which was an experience. The shop I bought the tranny from told me that virtually any oil will work well and through his experience thought that 20w50 engine oil was a good place to start. I know the factory specifed as high as 130 gear oil. Any thoughts. thanks

The manual specifies ATF... you can use this for quicker shifts, if your gaskets leak you'll bleed the box out in a hurry going down the road.

I use 90Wt "GL-4" in my A-833OD (DO NOT USE GL-5!!!! it's for sure grip rear ends and causes the synchros to skip...).

Some have actually specified in colder areas you can use non-detergented 30Wt.


Your choice, each works perfectly fine.

-D.Idiot

not sure what you mean by "best". Absolute best would probably be a synthetic such as RedLine MTL. That is what I use in my Doug Nash 5 speed box. If you didn't really mean "best" then Rob's recommendations above are good.

when in doubt, read the service manual.

Right now I'm around el paso texas, quite a temperature range, hot during the day but winter/night it does freeze. I do spend a little time in Washignton to though.

i have successfully run 1 qt of atf and top the rest off with 80w90 (usually about 2 qts) it seems to work very well for me. i tried 80w90 for the full fill and it was good awful to shift. i think straight atf would cause other problems, but i am unsure as i never tried it (even though thats what the factory says to use)

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74 swinger slant 6, the slowest, most fun car i have ever owned.

thanks for the input all, I will work on changing that in the upcoming future. And just for the record, depending on the year, the manual specifies 130 wt. Other years though it does specify a lower weight oil.