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Old 06-27-2010, 03:05 PM
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TH350 shifting problems

I have a th350 in my truck. when i first put it in it ran fine i spun a coule donuts and now it doesnt shift right. if i put it into drive it will rev way up before it shifts or i just have to shift it manuely i dont even see third gear unless im on the highway. all the gears are solid when i shift but the shift points are way off? What causes this how can i fix it?

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Old 06-27-2010, 06:31 PM
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Have you checked your modulator valve it might have came un-hooked while you were doing those donuts.JMO

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Old 06-28-2010, 03:26 AM
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i had that exact same thing happen to me in my Pontiac with a TH350. it shifted hard but it took forever for it to want to engage. so went to shucks and got a new modulator. got home and pulled out my old modulator while spilling some tranny fluid on the ground i noticed it was an extremely dark red, like almost a brown color. and a few days prior to that my motor kept running hot and i could not figure out why, did a compression check and everything was fine, so i changed my radiator cap thinking my cap was bad. as soon as i drove it home i had acquired a small radiator leek and the water was a rust color i figured my radiator, oh boy was i wrong. needless to say none of this clicked right away. ok back to what i was getting at. so i then got curious and pulled the tranny. when i drained the fluid into my oil catcher pan i had a bunch of little green dots in the fluid. thats when everything the reason why i was overheating was i had tranny fluid in my cooling system, and the reason why my tranny felt like it wouldnt go was because i had anitfreeze in it. so my culprit was my radiator, the trans lines in the radiator bust inside. all of my clutches were gone, nothing left on there faces. except for the top ones in each of the clutch pistons. lets hope nothing to this affect happen to you, it was devastating to me...put a huge hole in my wallet
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Old 06-28-2010, 03:26 PM
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Yea try the modulator. its a little pod on the tail housing of the trans. most of the time the little rubber hose rots and breaks or falls off. also try checking the opposite end where it picks up its vacum either on the manafold or your carb.
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Old 06-28-2010, 06:17 PM
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Could also be a stuck kick down cable or a stuck governor
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