i got a 2000 E 430 it wont change out of 3rd gear i put fluid in it n still no

It looks like you're headed to a MB/import transmission specialist. No way to calculate cost until transmission is removed, disassembled, and diagnosed.

Your transmission may be in limp mode due to a non-transmission issue. Recommend you have your computer checked with factory level scanner Rick Steel Prestige Automotive 410-561-9696