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Old 04-06-2003, 07:48 PM
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Post THM 350 shift improvement

I'm a first time poster here. I have read through some of the Kit and rebuild threads but could not really find my answers. so here is some questions. This is a first for me. I have my rebuild kit and want to know if anyone has any knowledge about "Do I have to buy a shift kit" or does anyone know what holes would I need and what size the holes need to be, and where do those four little Ball bearings go, besides in the trash. Unless of course they go in the trash.

No lock up converter, just a simple 350 that I'm rebuilding today. In fact, I just came in had dinner and then got online to find the answers for "how to" and "what to" when rebuilding a mid 70's 350

I'm doing this blind, no books or videos. Just memory of where the general area is that piece fell from when I removed that last bolt.

And another question. I'm at the planet gears, there is a small tight clip that I cannot get off. Do they have to come out to finish the job or am I'm ready to start washing out the trans case with them still in place. The tail shaft is off and the clutch packs are on the shelf, if needed I will buy a shift kit. but I'm the kind of person who thinks sometimes it is not neccesary to buy everything. why not just make you own.

I'm trying my hand for the first time with a

THM 350 Automatic.

So far it is not as bad as I thought it would be to rebuild a tranny.

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Old 04-06-2003, 08:17 PM
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How did you get the tailshaft out without removing that little clip?

I would just fork out 30 bucks for the shift kit, or 60 bucks for top notch.

The reverse piston seals are the worst part about those trannys. They're located behind that planetary and little clip you're talking about.

With a piece of allthread and some straps of steel about six inches long and about 3/16" thick, you can make a tool to remove the reverse piston and change the seals. I use two little flat head screwdrivers to remove that clip, sometimes a pick.
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Old 04-06-2003, 11:58 PM
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Darn, I should have said the houseing, not the tailshaft. My mistake.

So I do have to go the next mile to finish. That is what I thought. Just trying to get out of work again. Oh well.

I had tried some mediuem small screwdrivers, but not the picks. I tried to bend the little screwdriver, it broke. I will have to go to the dentist and take a couple of picks after the first shot of Nova/caine. <img src="graemlins/drool.gif" border="0" alt="[drool]" />

Thankx for the info. I'm off to the parts store, when they open.

I really did think this would be a night mare, but it is turning out to be kinda of fun to work on a tranny. Should have made this move twenty years ago and started a transmission shop instead of working at the factory.


OK I'm going to get the Shift kit. But I have to ask. What is the "Top Notch" you spoke of for $60.00? <img src="confused.gif" border="0">
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Old 04-07-2003, 04:17 AM
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shift kits are nice but you can do the work with out buy one, invest in a book to help you with the small stuff. depends on how hard you make it shift you might start brake'n parts you need to know what bad before you start replace new parts

front pump always bad in most 350 transmission replace torq converter as well!
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Old 04-07-2003, 08:17 AM
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Shift kits will also include springs that go into the vavle body. They are really short money and well worth the money. I paid $13 at my local trans. shop for mine (transgo) Its not just a matter of redrilling some holes
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Old 04-08-2003, 05:47 AM
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First off I want to thank everyone for their advice and help. When we pull together we acomplish alot.


OK I got the picks and the rest of the stuff inside came out. Then took the clutch packs in the house and put them on the Dining Room table; Honey wasn't home (Took and spread the table apart in the Middle and it holds the front shaft like a vice)Rebuilt them and cleaned everything with brake cleaner; scraped and scrubbed, installed all the parts, drilled, replaced the springs and gaskets, everything went well until I put the tranny back in. Is there some adjustment for the park range on the inside? My shifter wants to go into park but not stay there. No changes were made to the shift linkage so is there some shifting adjuster inside at the detent? Or? All the other gears are working fine and park works but will not stay parked, jumps backwards. Any sugestions?


Oh and yes I did wash the Table off when I was done. Put the place mats back and wiped the tranny fluid off the kitchen floor. The tranny fluid came from the new assembly quart of Dextron III


Oh yeah, Those tricky valves in the valve body. push in and turn the body over to release the pins. That took a friend at the Autoshop to show me that one. I just stood there looking at them. Things that make you go HMMMM?? But now that I know, they will not get to do that to me again, unless I do some other form of tranny that uses a different type of trick.

Who thinks of these things? And do they just do that to frustrate people?

[ April 08, 2003: Message edited by: early57 ]</p>
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