I’ve been looking for a long time all through the internet, maybe I‘m not describing accurately enough. This is about a 2004 Savana cargo van with all-wheel drive and 5.3 ltr. With 89,000 miles - it has a mild vibration or shudder that occurs pretty much exactly at 47 mph and stops at about 53 to 55 mph. I bought this stuff called Trans Medic in these small Red plastic tubes I was going to pour in with a trans fluid change I’ll be doing soon.
I don’t have a clue what to look at. No OBDII fault codes, Fluid change? Additives? Years ago I upgraded to the new van wheel size of 17” from 16s. The tires are good, what could it be? Is there any GM automatic trans forums?
I don’t have a clue what to look at. No OBDII fault codes, Fluid change? Additives? Years ago I upgraded to the new van wheel size of 17” from 16s. The tires are good, what could it be? Is there any GM automatic trans forums?