Doug Nash 4+1 Help

[Bobby Fazio]

I have a Nash trans with Liberty face-tooth gears. Heavy, but bulletproof. However, every once in a while, the thing will not go into 3rd gear going down track. It goes in third around the pits and on the return road but under 8000rpm load it won't. It does it randomly and it did it in 2nd round last night. It is not a clutchless trans and I have to use the clutch to shift so I put more pedal travel (We are at about .080 air gap) and I even tried granny shifting it in 3rd round last night and it still wouldn't go in. We've taken the trans apart a few times now and found nothing.. Everything still looks brand new. No problems going in 2nd or 4th ever.

Could the clutch be getting too hot in the burnout that it is not fully releasing? But why is 2nd and 4th never a problem?

[L79racer]

Go to this web site. Its for stick cars. A lot of the guys over there are running that trans. Look under tranny tech.
http://www.umtrnorth.com/Forums/default.asp

[Notch1320]

Have you checked the adjustment on the shifter stops?

[Bobby Fazio]

Shawn I haven't checked the stops because it seems to go in 3rd fine everywhere but on the track. I'll double check it though.

It's weird though because after I miss third, I quickly get off the throttle not to over-rev but even with the clutch still pressed all the way in and me coasting I still can't jab it in 3rd for those few seconds. I have to put it in 4th or neutral.

[gmonde]

check the detent in the trans its a steel ball with a spring,you mite have a bind from 2-3 and also the case holes for the shift forks ,as those transmission get older the holes start to elongate and that affects the detents ,,i used to run one and the holes where an issue,should have re bushed the case but sold the trans ,,pull the trans out and mount the shifter on the trans a try to duplicate the the shift but you will need an assitant to turn the input shaft ,you mite find something there gmonde

[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

[randy wilson]

Look at your hub, also. You might have a problem there. If so, turn you're slider one tooth and, the hub one tooth, and make sure it slides freely.