Trans - Mopar from dealer - synthetic, clear fluid (not red dextron) used in current Vipers, need 4 quarts. Easy to do with lift...take off trans skid plate, open drain plug, drain, close, open fill plug, get 3-4 inch tube with OD the same as ID of fill hole, insert in trans and squeeze bottle in other end. This is a little tricky and messy because you need to try to cram the bottle up wherever you can to get it higher than the fill hole. I put almost all 4 quarts in and when I pulled out the tube a bunch leaked out which is good. Just have a funnel ready and wait until it stops, then plug.