Hi, I am suggesting using the Anti-TLR4 antibody [76B357.1] (ab22048) from Abcam, It is suitable for IF, but you can contact the Abcam or other vendors like cell signalling and Invitrogen.
For me, following TLR-4 detection worked with IF: 1) Abcam, Cat. No.: ab22048. dilution 1:200. 2) Novus Biologicals, Cat. No. NBP2-24821. dilution 1:200.