[FED 387]

If it is ONLY 3rd gear then Somewhere along the way you either missed a shift or ground a gear trying to get into reverse or it is time to service the trans and burred up either the slider or the gear or both on the mainshaft---a few things to look at also

#1--Double check your shifter arm bushings if you use them make sure they are not cracked or broken in any way you would better off with heim joints on the shifter rods anyway Hurst bushings or Mr Gasket used to work the best---change them FREQUENTLY

#2----Take the trans apart and look at the sliders or the main shaft gears if there are ANY burrs on the teeth it will not shift at hi RPM--

#3 if there are any burrs take a Dremel or carbide burr and dress them make sure there are NOT ANY burrs on the slider or the gear

#4---Have you removed the dogs in the gears if there are any in your trans?

#5 --check the shifter alignment pin and adjust the shifter so that that pin slides in and out FREELY with ABSOLUTELY no movement of the shifter arms while doing this

#6--- look at both of the holes in the shifter arms make sure they are not wallowed out and make sure you are using a locknut to attach the arm to the shifter fork stud

#7 air gap is not that important unless you are using a real aggressive clutch disc that gets more aggressive the hotter it gets then the disc will not fully release cuz it got hot and closed up the air gap

these are a few suggestion and not necessarily in this order but from my experience things that need to be checked

My guess is that the slider or the teeth on the gear need to be dressed!!!!Thats the first thing I would look at--if not that then look at the other things next --- good luck let me know what you find out-- I probably made 300-400 passes with a DNE2 trans and from trial and error learned how to make these things live and work well---Comp 387