This is a common symptom of column shifter with a little too much play
and/or out of adjustment. What happens is the you have not pulled the 1st/
reverse lever all the way out of 1st and into neutral before the 2nd 3rd
lever tries to go into 2nd. Since the interlock inside the tranny is made
to not allow you to be in two gears at once it jams or locks in one gear.
You can try to adjust the linkage and can also shift with a square pattern
as you go into neutral but chances are the only real fix is to replace
linkage bushings and/or shifter box. There is likely some excessive play
somewhere but try adjusting first.
50 Chevy 3100
52 GMC 150
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
oletrucks is devoted to Chevy and GM trucks built between 1941 and 1959