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Need a Tranny question answered as soon as possible

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by Bowtied, Jun 3, 2001.

  1. Bowtied

    Bowtied Registered Member

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    Hello everyone. I have an 87 k5 with a TH350 that sounds like it's about to shell out. It makes a wierd grating noise (occasionally) when I romp on it, regardless of speed or gear, what do you think?

    Also, I have an older TH350 from my 79 chevy 4x4 truck. Are they completely inner changeable? Can I rebuild the tranny from the 79 and slap it right into the 87 (after swapping out the t cases).

    Finall note, Just in case anyone needed more info to help isolate the malfunction: No slipage at all, filter has been changed and fluid level is good, and bangs through 1st thru 3rd nice and strong. It just makes that loud grating (raking) noise. Sounds corny but it's sometimes difficult to verbalize a sound. :)

    Thank you in advanced for responding.

    Bowtied.
     
  2. 89Blazin

    89Blazin 1/2 ton status

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    The couple TH350s that have shelled out on me lost power big time. Never had one make a racket and still deliver power. Sure you're not hearing u joints, bearings, or some other possible drivetrain noise?

    85 Burb and an 89 Blazer
    One just for fun, one simply for pleazer
     
  3. Bowtied

    Bowtied Registered Member

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    89Blazin,
    I'm not sure, but it does sound like it's coming from the tranny. You could be right about looking into other components though.

    One thing I forgot, when I did the filter change, I DID find some small brass colored shavings in the old filter, but not a lot.

    Again, I'm clueless on this topic so any help is very appreciated!
     
  4. Can Can

    Can Can Pusher Man Staff Member Super Moderator

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    The grating sound you're hearing kinda sounds like a cracked flywheel- My buddy had an 89 1/2 ton and everytime he tromped on it, you could hear a rattle coming from the tranny area. It ended up being a hairline crack in the flywheel. Anyhow, just another idea to check out..............



    <font color=red>PHOTO ALBUM-</font color=red> <A target="_blank" HREF=http://albums.photopoint.com/j/AlbumList?u=1289798>http://albums.photopoint.com/j/AlbumList?u=1289798</A>.......<font color=blue>TRUCK & HIKING PICS</font color=blue>
     
  5. mudhog

    mudhog THEGAME Staff Member Super Moderator

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    i would agree with canmorek5 check into the flywheel area or take it to a tranny shop and get a free estaminet

    77blazer see it at<A target="_blank" HREF=http://community.webshots.com/user/ssmith6333>http://community.webshots.com/user/ssmith6333</A>
     
  6. Sparky87k5

    Sparky87k5 1/2 ton status

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    I had a TH400/NP208 in a '88 Sub make the same kind of noise that you describe and still shifted OK, although not for long. Pulled trans and found pump was shot due to torque converter failure. Trans shop showed me thrust washer / bearings that were shot too. Main cause? Too much torque / horsepower applied to stock converter from 513 cu.in. engine while towing 30' trailer up mountain passes.

    87 K5, D60 & 14FF, 5 sp & NP208 & 383 stroker. Build it Bulletproof and take it fishing!
     
  7. Grim-Reaper

    Grim-Reaper 3/4 ton status Author

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    Uhh what transfer case do you have cause 87 came with a 700R4 so that TH350 was swapped in. If you got a 203 that is full time it could be a bad chain.


    Diging it in the dirt with my K5's
    Grim-Reaper
    <A target="_blank" HREF=http://grimsk5s.coloradok5.com/>http://grimsk5s.coloradok5.com/</A>
     
  8. Bowtied

    Bowtied Registered Member

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    Grim,
    I asked that same question to the folks at the parts store. Th guy there told me that it was possible that since the changeover took place in 87, I could possibly have a leftover 86 tranny in my 87 Blazer.?.
    To your other question, I checked and its a 208.

    Some folks brought up the flywheel, I hadn't thought about that one.
     
  9. Bowtied

    Bowtied Registered Member

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    CanmoreK5,
    Thanks for the info. I hadn't thought about that at all.
    That would be a little cheaper too!
     
  10. BillyBob

    BillyBob 1/2 ton status

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    Change over? what change over? if you're talking about the tranny, the 700R-4 was out around 1982 (maybe later, I don't remember). My 84 has a 700R-4 from the factory.

    <A target="_blank" HREF=http://billybob.coloradok5.com>http://billybob.coloradok5.com</A>
     
  11. Can Can

    Can Can Pusher Man Staff Member Super Moderator

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    No problem, brother!!!! Hope you can find the problem.........let me know what you find out!!!!



    <font color=red>PHOTO ALBUM-</font color=red> <A target="_blank" HREF=http://albums.photopoint.com/j/AlbumList?u=1289798>http://albums.photopoint.com/j/AlbumList?u=1289798</A>.......<font color=blue>TRUCK & HIKING PICS</font color=blue>
     
  12. Executioner

    Executioner 1/2 ton status

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    Yup something sound's fishy to me , mid 80's and the th350 whent buy buy.
    You know it's kinda like Dana(Spicer) making the 10bolts fronts !
    Good luck
     
  13. Blue85

    Blue85 Troll Premium Member

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    I know that in a 700R-4, the pump pressure regulating valve can make a sort of a buzzing noise, especially when the throttle is open because the throttle valve has increased the line pressure. However, I'm pretty sure that the 350 has a gear-type pump, while the 700 has a vane-type pump, so they probably don't have the same kind of valves. BUT, are you sure it's a TH350? I thought that the TH350/NP208 combo only came in 3/4 ton or 1-ton applications...
    Perhaps yours is swapped in? If the 3-speed is factory, then you should have only 3 ranges on the gear indicator on top of the column, but that could have been changed with the transmission, too. If it is the oil pump or torque converter with junk in it making noise, the whole thing will have to be rebuilt soon.

    I don't think that you can mate a 79 transmission with a 87 transfer case without swapping the output shaft of the tranny, but I could be wrong (it happened once before [​IMG]).

    <font color=green>If a K-5 is "Built not Bought", why does this stuff cost me so much money? [​IMG] </font color=green>
     
  14. Bowtied

    Bowtied Registered Member

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    Thanks to all of you who responded. Some of the info I got made me second guess my original assumption that the tranny was on its way out. The thing still worked awesome except for the noise, so I decided to crawl under her tonight and check things out. Well guess what. I am relieved (and slightly embarrassed) to announce that the noise was not coming from the tranny. It seems my catalitc converter is the noise maker. I found it while shaking things down. I guess the ceramic type stuff in it somehow cracked and there is a piece stuck in there. When I pound on it, it makes the noise, only not as pronounced.
    Anyhow, Thanks again for all your inputs. At least now I'll know what to look for if it does decide to go!
    Bowtied.
     

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