Transmission Additive Not Possible? Olds Cutlass 99


I’ve been having some minor slipping with my oldsmobile 99 I bought in the Fall. $1700, 126k miles. I have some Lucas Trans Fix, but there is no place to check the transmission fluid levels nor a place to add the fluid. After a little research, it seems that the engine must be serviced!

Is this true, or is there someway to get around this and add the fluid? If there’s not, I might get the tran flushed (though I’ve heard some disclaimers) and tell the mechanic to add the additive. How big of a hole could this end up burning in my pocket?


— Please pardon the duplicate posting —