I dont have actual numbers and cannot get them (trans is sitting on a bench at work pending a rebuild) But my 4th and 5th gear RPM's are VERY close. Hardly noticable at all, ever. My truck has 235ish thousand miles on it, but even 10 years ago with ~150k it was the same way when it was my brothers. If you have larger than stock tires, that puts extra strain on the clutch and may be causing it to slip in 5th gear just enough to negate the OD funtion of 5th gear. Just a thought.


'89 Raider V6 auto.