I have a 98 Ranger, 3.0L, 4WD, manual trans. When I am accelerating in 1st or 2nd gears the truck often gives a slight bump. After 2nd gear it doesn’t seem to do this and I am in 2WD at the time (not 4WD). It is a lot more noticeable in warm weather. My thoughts are that it is the rear differential slipping and I may try using a friction modification additive. Any ideas on other causes or fixes?
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transmission is this automatic trans ? probably low on transmission fluid or needs to time for filter and fluid change on transmission