Trans fluid has friction modifiers in it that will damage fuel system components even if used for only filling the filters! Do not do it, GM did it in the 80's but that was before friction modifiers were added to ATF.
I have understood that the friction modifiers were in place to help keep the clutches and bands from slipping and make a trans more efficient. B&M Trick Shift fluid was one of the first to utilize FM's. That is why alot of racers used their fluid, it shifted more firmly.
I could be wrong as I am going off second hand info passed to me by my father, but when he ( a diesel mechanic of 33yrs) and a GM tech at the local dealer both say NO WAY! I tend to listen.
The original ATF is still sold some places as is NON detergent engine oil.
We used to use the ATF at a qt per 50 gallon and use the oil in lawn mowers.
I have NOT seen any damage from the old ATF but the stuff with letters added is only 1/2 oil and 1/2 other 'stuff' and not designed to burn, try setting a little bit on fire. And see what is left!
I have seen the junk in a mower on NON detergent so now it is the same as everything else and I don't need a new one every 4-5 years.
The other thing that comes to mind is the red dye in the ATF, under the current tax rules I do not want ANY red dye in the tank.
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