The trick is to very quickly accelerate it to about 50-55MPH, so your RPMs are very high and it never gets to fifth because you're pedal to the metal... then literally take your foot off the gas. You should be at 4500 RPM or more (V6). If it suddenly acts like it has runaway acceleration for a few seconds, then you have experienced the dog clutch effect.
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Thanks--you have given me something to check out on my 2016 as I have never felt any 4th to 5th gear problem and I do accelerate very quickly most of the time. Have to check for that runaway acceleration now and the dog clutch effect.
2017 Trailhawk L Plus 4 bX4,Rhino exterior,Power 8 way drivers seat, Willys in windshidel,Cold Weather Group, Comfort/Convenience Group,Trailer Tow Group, 3.2 -Liter V6, Black Hood Decal , Uconnect 8.4 , Safety Tech Group, Leather Interior Group, Ventilated/Memory seat Group,Navigation. No hole in roof.
2017 KL Latitude-4 by 4 Cherry Red, V-6, Safety/Convenience group, Cold Weather Group,which includes heated front seats--love those heated seats,