0
votes
3answers
33 views

My Chrysler 300

someone put sugar in my tank I had it dropped and clean but when they put it back together when you drive at 35-40 mph, it vibrates underneath the car what do you think it is?
9
votes
1answer
2k views

how to optimize fuel consumption by changing the rear differential ratio?

Is it possible to improve the fuel consumption (decrease it) in my van by changing the rear differential ratio? I would like to optimize it for low-speed driving about 40 km/h (25 mph). Is it true ...