In my 2006 Dodge Diesel Automatic transmission has 42,000 miles pulling a enclose car trailer all its life. Does the transmission have a adjustment? I want to install a new filter. So far I have done nothing to the transmission. I change the engine oil and filter every 3,000 miles. I know I could go more but I plan on keeping this truck all my life that I have left.:-laf Its never been in salt, snow or left outside.