I have found a parts car that is an 82' 300td, if the ratio is different what ratio would I want it to be to make my car better for lower rpms at 70mph
i have a speedometer from an 85 so it is incorrect, would an 85 be the best year to take the diff from? also would the back doors switch over to my 300 sedan?

 

do you think it would be worth the time to put the 3.07 in my car, currently i have a 3.46

 

ok thanks misread that, makes sense now