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Old 12-05-2002, 08:54 AM
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Post TH 350 shift problems

I have a '72 blazer it sat for 3 years i just got it running but it does not shift right it will only go into 1st and slips in and out of gear, it worked fine before and the fluid is fine I need help i do not want to put a new tranny in it.
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Old 12-05-2002, 01:55 PM
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Sounds like possibly the seals are hard from sitting, I recently got a TH350 that sat in a shop for years and it had the same problem. when the seals get hard it can`t hold enough pressure to keep the clutch packs engauged which results in cooked clutches. if you can, have the tranny pressure checked by a tranny shop. and maybe check the filter out. even so I hate to say, I think the seals are likely gone, which means rebuild time.
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Old 12-05-2002, 03:23 PM
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Double vision hit the nail on the head. Sounds like it's the seals or strainer stopped up! Maybe you could check out your vaccum line going to your modulator. But if all else fails you may be looking at a rebuild. I don't want to give you and bad ideas but I know that we only suppost to put trans fluid in transmissions, but local part stores have additives for transmission that are suppose to recondition seals and stop leaks! I never used it and may be get a second oppinion. But if you decide on a rebuild what the heck TRY IT!!! <img src="graemlins/sweat.gif" border="0" alt="[sweat]" />
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Old 12-06-2002, 08:47 AM
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I should just put a 4 speed in it. I plan on pulling the pan this weekend and checking it out inside, maby its got some sludge in it or moisture got to it and rusted or pitted something inside. I have already checked out the vacume line so i know its not that, thank you for your input.
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Old 12-06-2002, 01:49 PM
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When you say 4 speeed are you refering to a 700r if so good luck! I changed to one and I'M still not satisfied with the performance. And 700r don't like big gear rear ends and that blazer probabbly has one. If so then good luck just stay away from B&M PRODUCTS mainly shift kits and stall converters
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Old 12-06-2002, 02:02 PM
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No when i say 4 speed i mean SM420 or SM465
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