Re: 99 Yukon trans service, when? Fluid looks great
iF NEVER changed anytime now would be worth it as it appears to be looking good but trannie oil wears out also not like motor oil in getting dark>> if trannie oil gets dark you have deep problems Change it now then you have a starting point at least mostly city traffic with no external cooler,towing,or highway drivind will determine your next change 60,000 {100,000 KM] miles is a good number for normal more extreme would be done at about 40,000 miles{60,000 KM}
