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Anybody rebuilt their tranny?

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by DesertDueler, Aug 29, 2001.

  1. DesertDueler

    DesertDueler 1/2 ton status

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    I need to rebuild a tranny for my Firebird. It is a Turbo 400 tranny? Has anbody done one before, and how hard was it? What company did you use for the rebuild kit? I would like to try and tackle this since I have time until racing season. Its still 105 degrees here.

    86 Jimmy 4"lift 35"MTRs Other cars 69Firebird w/525 hp,and 70GTO live in PHX,AZ<a target="_blank" href=http://www.geocities.com/modifierperformance>My vehicles</a>
     
  2. DesertDueler

    DesertDueler 1/2 ton status

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    Also any special tools?

    86 Jimmy 4"lift 35"MTRs Other cars 69Firebird w/525 hp,and 70GTO live in PHX,AZ<a target="_blank" href=http://www.geocities.com/modifierperformance>My vehicles</a>
     
  3. Nonesuch

    Nonesuch 1/2 ton status

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    im with you on this. i want to try and tackle a th350 rebuild. i understand its the easiest slush box to start out on. i know there are several books available at parts stores and probably amazon or b&amp;n that may help you and give you the required tools to perform the rebuild. GL adn i hope it turns out well.
     
  4. Grim-Reaper

    Grim-Reaper 3/4 ton status Author

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    Yeah I have rebuilt a TH350. Not as hard as you would think. I used a company out of Alabama for the parts called Delta Automotive (sorry don't have their number) this is a place tha mostly deals with shops but still will sell to little guys.
    There is one sepcial tool that you can make. The clutch packs have springs that need to be compressed so you can get the locking rings out. I used a harmonic ballancer puller and put some 3/8 bolts through it and a flat peice of 1/4 plate and made it work as a compressor. Did great. The #1 pack is in the tranny and cannot be removed. Have to get a little creative to do that one. I think I paid $130 plus shipping for new clutches, Steels (these go between the clutches), Seals, Rebuilt converter, Cooler flush kit, and a book on the tranny.
    When I got my tranny appart I found that my foward sprag was toast and it ruined the forward drive drum and the pump was shot. The local Tranny shop Sold me used parts for $75.
    That was 3 years ago and still pulls fine. Dragged my moms car home with the truck from Knoxville to Atlanta a couple months back so I guess I did it right [​IMG]
    Now I'm not sure I would mess with a electronic control tranny. Lots of stuff in there is much more sensative than the TH350's or 400's. Those tranny's are pretty simple and If you can build a engine you can do the older tranny's.
    You also will probably have to Heli coil a few places on the housing. Make sure you know where to find them once you get started.

    It's not my damn planet monkey boy!
    <a target="_blank" href=http://communities.msn.com/OffroadK5s>communities.msn.com/OffroadK5s</a>
    75 Jimmy, Dollar
    79 Chevy Blazer, Her's
    70 Chevy Burb
    Grim-Reaper
     
  5. DesertDueler

    DesertDueler 1/2 ton status

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    Thanks for your help Grim. I think I will give it a try. I built tons of motors but no trannys. I guess its time to try.

    86 Jimmy 4"lift 35"MTRs Other cars 69Firebird w/525 hp,and 70GTO live in PHX,AZ<a target="_blank" href=http://www.geocities.com/modifierperformance>My vehicles</a>
     
  6. dyeager535

    dyeager535 1 ton status Premium Member

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    Personally, between learning on a TH400, then doing a TH350, I thought the 400's were easier. Pushing bushings in can be a bear, as can the springs in the clutch drums.


    Dorian
    My tech/links page: <a target="_blank" href=http://www.dorianyeager.com/index2.html>http://www.dorianyeager.com/index2.html</a>
    No anti-theft measures on your truck? No pity when its stolen
     
  7. DesertDueler

    DesertDueler 1/2 ton status

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    Thanks for your support. I ordered a overhaul kit today. I sure I will need help so I ask you guys then,
    Thanks,
    Dan

    86 Jimmy 4"lift 35"MTRs Other cars 69Firebird w/525 hp,and 70GTO live in PHX,AZ<a target="_blank" href=http://www.geocities.com/modifierperformance>My vehicles</a>
     
  8. BigJohnson

    BigJohnson 1/2 ton status

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    Grim-Reaper, if the Delta Automotive you are talking about is in Sheffield AL then the number is 256-383-9174 or 256-383-9181. Sheffield is my hometown and Delta Automotive is the best place around for good tranny parts. They are also cheaper than any one in the area.
     
  9. Grim-Reaper

    Grim-Reaper 3/4 ton status Author

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    Yeah that's them. Cut me a great deal. I forget the guy's name that I delt with but he was good to work with. I think I originally got their number from Titanic.

    It's not my damn planet monkey boy!
    <a target="_blank" href=http://communities.msn.com/OffroadK5s>communities.msn.com/OffroadK5s</a>
    75 Jimmy, Dollar
    79 Chevy Blazer, Her's
    70 Chevy Burb
    Grim-Reaper
     
  10. Wheels

    Wheels 1/2 ton status

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    Haynes makes a book on TH350/400/700 but it is sketchy in some parts. The best is offered from the Automatic Transmission Service Group (http://www.atsgmiami.com). You can order their books from the net. Also Transonline (www.transonline.com) has a good data base on troubleshooting, rebuild minimums do or die, etc that was very informative. I've rebuilt several 350 plus a couple of 700R4. On the TH350, the low reverse piston is the only place you need a special tool and a couple of 2" "C" clamps can do the job. Get a couple of bolts a little longer than the pump bolts, cut the heads off and round the ends for guide pins (I used a hacksaw and cut a slot for a screwdriver to remove them). When you disassemble it, get about a dozen pie pans and as you remove a section, place it in a pie pan. Do this for each section to keep the assemblies together and have plenty of bench space. Also, you will need a good seal/bearing driver. Soak all the clutches in transmission fluid for about 20 minutes before assembling them. Other than that, good luck.
     
  11. DesertDueler

    DesertDueler 1/2 ton status

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    Thanks Larry. I will be picking up that book very soon.

    86 Jimmy 4"lift 35"MTRs Other cars 69Firebird w/525 hp,and 70GTO live in PHX,AZ<a target="_blank" href=http://www.geocities.com/modifierperformance>My vehicles</a>
     

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