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May consider a TH350, Any specific year?

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by Corey-88K5, Jul 25, 2001.

  1. Corey-88K5

    Corey-88K5 1/2 ton status

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    When doing my build up, I am intending to go with a Dana 60 front, TH400 & 205. As it stands, I'm having a hard time finding a TH400 mated, so I may opt to go with a TH350. Does any body have any suggestions as to what years to stay away from, or to go after? Actually, same with all the equipment listed above...

    Thanks,

    Corey
    88K5

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  2. Cmoe

    Cmoe 1/2 ton status

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    What gears are you running? I have T350 mated to a P/T 203 and changed to 4:56 gears, Becaause I'm changing to a 700R4 and a newer T-case. The gears are to tall for the T350 with my 35" tires...... Just a reminder to look all the way thru...... Good luck... Also why are you changing out the 700R4 and the 241

    C'moe

    <font color=black>the blazer is "Back in Black"
     
  3. Grim-Reaper

    Grim-Reaper 3/4 ton status Author

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    Somewhere around 77 GM started using a beefed up case on the 4x4 TH350. That would be the ones to find. The case has a thicker bell housing and a cast cover peice that bolts on with 6 3/8's bolts. That cover has a provision for a pair of braces that run up to the motor mounts to add strength to the tranny,case engine assembly. The hard part is finding the braces, motor mount plates (the brace attach to a plate between the motor mounts and the block) and the hevey duty cover. Tranny shops were nototious for leaving the braces off or install a stamp steel cover instead of the putting the part back on. These cases will usualy be bolted to NP203's.
    In 80 the TH350 became a TH350c. Has lock up torq converter. Not sure what it takes to run the converter.

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  4. Leadfoot

    Leadfoot 1/2 ton status Premium Member

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    Stay away from the TH350C. It does reduce the RPM's but nowhere near what an extra gear would do (I think 200 RPM max gain), but the tradeoffs aren't worth it. The converters are not built for the abuse of a truck. They were designed for Th350's in cars (even though they came in trucks) to help lower rpms. The cases were weaker, not designed for towing, and you have to add a vacuum switch to control lock and unlock. "Stay away from them in a fullsize" is what my tranny builder says and he knows his $hit.

    If you didn't build it yourself, how can you call it yours.......?
     
  5. Corey-88K5

    Corey-88K5 1/2 ton status

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    Actually, Sounds like you and I are on the same level. I currently have the 700 &amp; 208. Here are the reasons:

    I'm on my 3ed 700 and its going. I've had excellent luck with the 350's, but had wanted to go with a 400. I'm having a hard time locating one, and with that in mind, I'm opting to go with the 350 because of its availablity. The T-case has excellent reduction with the 33's and 3.73's that I'm currently running. But, I'm really tired of the slip yoke fluid leak thingie that I've had going on now for years. its not the seal, but the actual slip yoke that has grooves in it. Now that I"m building up the truck (got aprox 7-10k to drop into her) I'm looking for a build up that I won't need/want to swap out later. As far as gears, I'm planning on the 4.56:1's that you are saying that you are having a problem with. I'm also running 33's right now, but when they are gone, 35's will fill the holes. I've got a set of 5 TSL Boggers that are 35x16 that are just sitting around. They will be trail shoes only though. I don't really do enough highway driving to worry about the increased RPM range that I'll be getting into. Plus, when you boil it all down, the truck will be in the stock RPM range for the older setup's. These trucks have lasted years running the gear ratio, tire size and engine trans &amp; t-case setup. I'll just be going to taller tires, lower gears. I don't expect any major change in RPM as I have when driving down the road in D vs. OD. Trust me, my build up is being very thought out. I've put over 1 month into the build up process (still yet to purchase a single item). I'm one that won't move until I have it all figured out.

    Oh, and thanks guys for the information about the 350c. I'll have to attempt to stay away from those. Just a quick side note. I don't suppose they have a big "C" stamped on the side or something do they? Any series, model or serial number that will tell a person that this is the ill fated 350c?

    Thanks again,

    Corey
    88K5

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  6. Cmoe

    Cmoe 1/2 ton status

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    Wish we were closer so we could trade.....What has been going out on the 700s?

    C'moe

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  7. Corey-88K5

    Corey-88K5 1/2 ton status

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    Mine starts "Hunting" in OD. Other then that, they have been holding up. I havent ever lost any gears. The trans before this one the gears would "bunch up". Felt more like the truck was bogging down. just found out it was trying to go into more then one gear at a time or something like that.

    Corey
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  8. Cmoe

    Cmoe 1/2 ton status

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    It's sound like there is a problem with you lock-up converter!

    C'moe

    <font color=black>the blazer is "Back in Black"
     
  9. Grim-Reaper

    Grim-Reaper 3/4 ton status Author

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    Or the the sprag is bad.

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  10. Corey-88K5

    Corey-88K5 1/2 ton status

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    Mostly just tired of these stinkin 700's. I thought about the 400 w/ od. I'm also considering a manual. But I don't really want to go through the trouble of finding all the hardware. I guess if I came up with a donor truck, things could be different. I guess I'm just lazy in that aspect.

    Thanks guys, I'll let you know what goes on. I hope to get my build up started in the next month or so. I'm also hoping that it will cool down here a bit in good ol' NC.

    Corey

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  11. CK5

    CK5 In my underwear Administrator Premium Member GMOTM Winner Author

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    Corey, why don't you just get a new 400 from TCI, Jet, B&amp;M, others, they are only around 700. and come with warrenty and don't require a core. I know 700 sounds like a lot but compared to 1500. for a quality 700 rebuild its peanuts.

    Steve

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  12. Corey-88K5

    Corey-88K5 1/2 ton status

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    Now THAT is something I didn't think of... I was hunting for a mated 205, but I've been coming up short. Depending on the final price, I may go that route. i don't suppose you have any idea on shipping cost &amp; if the stock 700 cross member will work?

    Oh, what about all that electric / vac stuff everybody has been talking about lately?

    Thanks steve,

    Corey

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  13. bigjbear

    bigjbear 1 ton status Staff Member Moderator

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    A note on the TH350C. I have one in my '80 with 200,000 mi &amp; 21 yrs on it. The big plus is it will net you the NP205 and adapter if you find it complete. Just some food for thought.

    Jim '80 GMC & '73 Blazer
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