Try taking the top off your shifter box and see if you can see what
happens in there when it gets stuck. I suspect the problem is in
the box and not your tranny. There is a piece of metal that
engages a forward cog on 2nd and the rear cog in 1st and I
suspect that it is out of alignment and can't get into the forward
cog. You can realign by losening the shift rods from the box and
line it back up. In neutral, everything should be perfectly
symmetical when viewed from above (check this in the shop
manual if you haven't already done so). Use lots of grease in
the box. Good luck.
On 9 May 00, at 9:13, Brad Newman wrote:
> My stock 49 3100 has a 3 on the tree shifter that will (sometimes) lock
> up when shifting from 1st to 2nd. When I say "locks up" I mean that the
> tranny gets stuck in 1st and will not shift into any other gear. This
> doesn't happen all of the time but when it does I have to get out, crawl
> under the truck, and push the shifter arm forward on the tranny. It only
> happens going from 1st to 2nd.
> As far as I can tell, the shifter rods are not bent, all of the
> clearances are good (between rods and arms) and nothing seems out out of
> the ordinary. I have followed the shop manual installation instructions
> to the letter at least 3 times, and still have the problem. The tranny
> was rebuilt before I put it back in the truck, I've had 3 different
> tranny guys (all with old trucks) look at it, and no one seems to know
> whats going on.
> Does this happen to anyone else, or better yet, would anyone know how to
> go about fixing it?
> Brad Newman
> 49 3100
> 24 1 ton
> Coppell, Texas
> oletrucks is devoted to Chevy and GM trucks built between 1941 and 1959
'50 3100 Deluxe
oletrucks is devoted to Chevy and GM trucks built between 1941 and 1959