I Might Just Know What I'm Talking About
Join Date: Sep 1999
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NP435 Shift linkage question / problem.
Well, went out wheeling this weekend, and didn't break the Jeep [img]/wwwthreads_images/icons/smile.gif[/img] but I managed to break the transmission in the truck towing the Jeep home. [img]/wwwthreads_images/icons/frown.gif[/img]. Now, this is in my 79 F250, but I know some of you guys run this heavy duty stuff in your Jeeps, so I hope it's ok to post this question here. [img]/wwwthreads_images/icons/wink.gif[/img]
It happened when I was backing the trailer up after I had gotten home (thank god). I couldn't get the shifter to go into ANY gears, except reverse, and that was with considerably more force than is normal. In taking the seat out, the tranny tunnel cover off, and the aluminum cover of what I think is an NP435, I found that the small plastic wear pads on the 1/2 and 3/4 shift forks are worn out. The 3/4 shift fork is even scored pretty badly, like 1/8" beyond where the pad would have been. The tranny gears look fine, but I haven't studied it really close yet.
Queston 1) It looks like the worn pads and the worn groove in the 3/4 shift fork let the fork pivot more than usual on it's shaft, and let the selector ball sneak out from between the spaces it's supposed to stay in between, making it get 'lost' between gears.
Question 2) The round ball that's on the end of the shift lever, that moves the forks around, has flats on both sides of it, and they look machined, not worn into place. Is this normal? Also, does the metal ball just move the forks around - metal on metal, or is there supposed to be something in there that's gone? The trucks got 136,000 on it.
Question 3) I can't seem to figure out how to get the shift fork off.
and lastly 4) Can I get the 3/4 shift fork off and replace it - it looks like it's just on the shaft with a roll pin. How much am I looking at $-wise for this stuff? I plan to call the dealer today, which I assume is the only place I can get these small parts. ??
Thanks for any help from you guys who have been inside these things. I've done a lot of work to my truck, but never gotten into the tranny. Sorry for the length, and thanks for any help.
Pete - now truckless [img]/wwwthreads_images/icons/frown.gif[/img]
88YJ, 4"susp, JKS 1.25" body lift, 33"BFGMT, 9000# winch, homemade rear tire carrier, reb. 258, 999 auto, 4.10 axles, weber 32/36 carb w/adj. reg., GMHEI, CJ dash, ...and one moonguy[img]/wwwthreads_images/icons/cool.gif[/img]