89 4.0 renix AW4, It shifts really quickly and won't downshift. Tried adjusting kickdown cable but no help. Also did flush and filter change. If I put it in first it will hold first till redline then shift. If i put it in drive it will quick shift through all gears in less than 100 feet. shifts at like 1500-2000 RPM's
Does your XJ have the "power/comfort switch"? The reason I ask is my XJ does the same thing yours does if I keep the switch in the Comfort position. If I keep it in the Power postion all the time it shifts perfectly. My tranny actually feels like it slips between gears if in the Comfort position. So, I have literally driven it in the Power position for the last 2 years and it runs fine and still gets 18 mpg on the highway.