hello to all i appriciate all the great info on this site. i am haveing a problem w my nv4500 in so being there is no 3rd or fourth gear . i have a 98 2500 4x4 w about 270000 on it. i was getting on the freeway about 20 min ago and 3rd gear droped out under acceleration?? tryied 4th and nothin? i am now driving at about 12 mph and have 47 miles to the closest service station . 1,2,5 and reverse all work fine .. and almost no noise from the tranny in second and 5th is it safe to drive !!! and what did i do ???

 

I hate to guess and have you totally ruin it.
is there a feeling of it shifting in 3rd and 4th?



if not it sounds like you may have broken the pin in the shift collar or fork.
IF that is the case you should be able to drive it.

I just looked it up and they share the same fork and rail.
I don't think a transmission can be in two gears at once.
here is the link

http://www.offroaders.com/directory/...0-exploded.htm


edit I thought you were on the road.
check your shifter also.

 

I think m-man is on track. 3rd gear is on the countershaft along with 1st and 2nd, while 4th gear is direct drive so you hav'nt broken a shaft. Somehow your shifter has disengaged the 3-4 gate. There are two types of shifters on the 4500, round top and square. You need to pull the shift lever off to see what is wrong.

 

thanks guys.. i made it home safely and no further damage to the tranny . when i got home i dug into it and found that it has the square type of shift . i also could not see anything that looked to be obviously broken. i manualy shifted it in and out of third and fourth gear w out the shifter on. ( granted not safe but if i die in my truck i die happy) it just acts like it is in stuck in N. no grinding no growl. is it a shift fork or pin ??? ( oh ya, i tether my blackberry to my laptop and get internet anywhere my phone works) hard to type and drive though ha ha ha

 

These are the guys I take all my transmission problems to. http://www.standardtransmission.com/
Ask for Cory.

 

I do the same thing, just with sprint mifi 2200. My wife does most of the typing though.