Th350,

Ah the Th350s.

A few years back (actually many), I lost third gear, and reverse got sluggish, then reverse dissapeared, then I had first and second gear, that was it. I drove it for a week to work like that, and second dissapeared.

My problem lay inside. I am not technically sound on tranny terms, but the third band (I think if I remember right) had this little "plastic cup" that fluid would push against telling it when to shift. That plastic cup flopped around like a dying fish.

So I rebuilt the thing, and the rebuild kit didn't have this "cup", after some hunting a buddy of mine, who who rebuilds tranny's constantly for his stock car gave me a new cup, but this one wasn't plastic, it was metal, and I think, not 100% sure, it came out of a BM shift rebuild kit. But I put it in, and boom worked great.

Later on I found out my ex, at the time had took it and dropped it in low and stomped the gas. That will brake that little "cup" and stop the tranny from shifting.

I don't know or remember the technical name, I have tech guides somewhere out in the garage to retain that info for me, but some one on here may know. But that was what was wrong on mine, when I lost reverse and such.

Good luck.

 

I just had a detailed conversation with a transmission specialist today so some of the information he gave me is fresh in my head...

He told me that the 2nd gear band is the weak point on the TH350 and since you're not coming out of 1st you maybe experiencing the issue he mentioned to me. I'm not a transmission expert by any means, though. I'm just passing the word...

 

Hello there
I am in need of some assistance.... I have a th350 paired up to a 305 in a 86 cutlass. I had the tranny rebuilt recently and afterwards it worked fine for about a week. The problem it is having is that in every gear other than park it moves forward in first gear and wont shift out of first even at wot it also has no reverse it goes forward in this gear as well i would be very grateful if any one could provide me with a good idea of where my problem may be. I have checked the following fluid level, Trans pan for shavings and chunks.

thanks blinky

hi,

to correct previous posts with answers ;

2nd gear and 3rd gears are not bands in the t-350 trans.



Blinky: If ..... as I read your post the trans tries to move forward in reverse (?) gear, this means you have serious problems or the shift linkage is flopped loose inside the pan.

I'd pull the pan off to check items or take the trans back to the builder for proper warranty repair.

 

hi,

to correct previous posts with answers ;

2nd gear and 3rd gears are not bands in the t-350 trans.



Blinky: If ..... as I read your post the trans tries to move forward in reverse (?) gear, this means you have serious problems or the shift linkage is flopped loose inside the pan.

I'd pull the pan off to check items or take the trans back to the builder for proper warranty repair.

If that's the case then do you have any idea as to what the transmission mechanic I spoke to was referring to? Like I said I'm not a transmission expert by any means, but I do like to pick up knowledge anywhere I can...

 

here is the inside.

 

Hi blinky,
Check the modulator valve for vacuum, remove & check the governor for broken teeth on the gear.
Rich

 

I had the exact same issue with my rebuilt 350. My shift linkage came un done inside the tranny. I recommend dropping the pan and having a look inside where the linkage goes into the tranny. There should be a little "S" clip that connects the linkage to a little plunger type arm. I don't know the exact names but if that stuff isn't connected, you can move your shift lever all you want but the shifting in the tranny won't be happening. Everything will look connected and sweet from the outside.

Once I connected the little "S" clip and tightened the bolt that holds the gear in place I was golden.

 

hi there thanks for all the help so i have checked the following

i removed the governor looks brand new no issues
vaccum modulator appearsa to be in order hooked up to vaccum on manifold

the next thing i will check is to examine the shifter linkage in the pan thanks for the help i will update after this

 

350 trans

noodles is right first check that the s linkage is in the right way, then see if the valve moves by turning the linkage and watching it, I rebuilt t350's and t400 for years most was a linkages issue if it moves foward in reverse

 

Had that happen too on a TH350, couldnt get the linkage adjusted. It was ****** up inside the trans. Had to go back to the shop and have them fix it.

 

so i dropped the pan today what did i find you guessed it no clip im a pick one up put it in and she should go

 

hi so i put the s clip in added fluid excetera i got it to work but it seems as if i need to adjust the gear locations in the colum its hard to find reverse as if im skipping it any thoughts??