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TH350 wont shift

E

EDdaTREE

1/2 ton status
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Feb 18, 2000
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Austintown, OHIO
Just did motor and tranny swap over the weekend on my 76' K/5 and now she doesnt wanna shift past first gear. Been trying to de-bug it before work every day, but you know how that goes, not enough hours in the day.Swapped modulators WED.and messed with vacuum lines.Didnt hook up kickdown cable yet either. Anybody have any ideas? Thanks for any input
 
You mentioned that the "kickdown cable" wasn't hooked up yet, I think you just answered your own question.
 
I don't think the kickdown cable has anything to do with it. Same thing happened on my 74 GMC 3/4 ton (wouldn't shift past second in the beginning, and eventually stayed in first all the time.)...changed the modulator and triple checked everything else. Changed the fluid several times and found some ugly metal shavings. I sent the truck down the road thinking the tranny was fried, which I attributed to high miles and 4.56's. Good luck.

10 BOLTS O' FUN
 
When you did the swap, did you seperate the motor and tranny or do it as one piece? Tranny mechanic once showed me that you need to be careful when you put the converter on the tranny, better to stand it up and spin it on as there are dogs that need to connect to the different pumps in the tranny. What you will notice is that when you set it on the tranny and turn it a bit it will drop down, most folks stop there, but you need to turn it a few more times and it will drop a second and somtimes a third time as things engage, then you have to be careful it does not move out on you.
I recall this was brought up because someone else had done the same thing, and because it did not line up it would not shift....just a thought...

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Eagle86K5
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Masonry...It's a Good Thing
2B1ASK1
 
I had the same problem with my TH-350. I got it rebuilt and it's fixed. Sounds serious...

Blazin' in Flagstaff
 
The valve body is probably stuck. Where did you get the trany from and did it work before? Can you shift into P,N,D,D2,D1? If not do you have the shift selector rod in the right spot?
 
If you can shift it manually to second gear then its definetly the kickdown cable. Because without tht it won't drop into passing gear.
 
Make sure your vaccum line comes off the manifold and not the carb. Check for leaks in the line. Hose should be all metal except for ends. Kick down cable is not the problem.If tork converter was not in pump all the way tranny would not get close enough to bolt to motor.
 
Went out today and found that it has a TV cable instead of a kickdown cable, at least thats what chilton's and hayne's manuals seem to say. Set the adjustment on it and still only have first and reverse. Vac. line to modulator should go to carb.,right? Cant get 2nd or 3rd by shifting manually,btw. Guess I'll have to dig into it over the weekend, thanx for the info guys
 
I hope its not what Eagle said...was working on something else and the brother-in-law had mtr. and tranny bolted together in driveway before I got to get a look at it. I'll check for vac. leals in the metal line too, hope it don't rain this wknd.
 
Turns out that the end of the vac. line was plugged with crud, couldnt see it cuz it points right at the trans. Thanx for the help guys.
 
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