Help! th350 wont shift from 1st to 2nd
 

Im trying to sell my truck so I can get something that suits what i need. I know waah but the truck is acting up whenever someone wants to test drive it. The last guy who was looking at it is interested in purchasing it if i get the tranny fixed. The thing is, I dunno whats going on. I replaced the fluid, changed the filter, replaced the mod, the vacuum line, and the fluid is at perfect level and is red.

I think that i let the truck sit too long, because of the weather, and the fluid isnt circulating. Anyone have an idea or solution? All input is welcome.

Re: Help! th350 wont shift from 1st to 2nd
 

-Check your kickdown linkage
-Check the shifter linkage to make sure it is operating smoothly and properly
-Drive it around a bit before the next buyer stops by to loosen up the bands.

Is it slipping or just not shifting?
Slipping = bad
Not Shifting = fixable

Re: Help! th350 wont shift from 1st to 2nd
 

whenever mine doesnt shift or has a delayed shift time i know my vacuum line is kinked, cut, or damaged. 5 out of 5 times it's been my suspect.

Re: Help! th350 wont shift from 1st to 2nd
 

Thanks for replying. The trans. is not slipping, its just not shifting to second on its own. :smoke: Ill try to mess with the linkage and the vacuum hose. Luckily the guy gave me a month to figure it out.

Re: Help! th350 wont shift from 1st to 2nd
 

this is the only problems ive ever had from any tranny(lucky me) its allways the vacume like. always. check it out.

Re: Help! th350 wont shift from 1st to 2nd
 

If, it is not in the linkage. Then, you have internal problems. Happened to a 70 Nova I had years ago. Installed a rebuilt trans and had that same problem. Lucky trans came with a warrenty.

Re: Help! th350 wont shift from 1st to 2nd
 

Thats what im afraid of. If it is internal, I might as well not sell it. I cant wait til i build my next one. ;)

Re: Help! th350 wont shift from 1st to 2nd
 

Check the govenor, it probably has the teeth stripped off. It will be at the back of the trans with a round cover and a clip over it. If it's bad the trans will not shift out of low gear

Re: Help! th350 wont shift from 1st to 2nd
 

also check the modulator, thats what the vac hose goes 2.

Re: Help! th350 wont shift from 1st to 2nd
 

:agree: That's what it's always been for me too - finally put a small hose clamp on the line at the modulator. Try starting in low and shifting it manually up - if it'll shift manually, then IMHO that's the first place to double check.