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Transmission question

Discussion in 'The Garage' started by 85threeofive, Nov 8, 2005.

  1. 85threeofive

    85threeofive Registered Member

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    I have a 1985 305 K5 and I was wondering what kind of Tranmission that I had? I dont know if it is a 700-R4 or a TH-350 any help is greatly appreciated because I want to do a rebuild on it.
     
  2. MOBK5

    MOBK5 1/2 ton status

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    700
     
  3. 85threeofive

    85threeofive Registered Member

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    how?

    how can you tell?
     
  4. K5Steve

    K5Steve 1/2 ton status

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    3 gears and an overdrive gear(4 speed auto).Does your gear indicator say
    PRN(D)D21 or PRND21?The th350 is a 3 speed tranny.
     
  5. anjieandjohn

    anjieandjohn Registered Member

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    I have the same year and engine...and transmission and a 208 transfer case...I got under there the other day and cleaned off some of the road grime and dirt and actually found the id tag on the transfer case. The tranny could be a 700r4 but if you arent the original owner it is no telling. One way is to crawl underneath and look at the pan. A square pan w/ 16 bolts is the 700r4...LMC has a good picture of different transmission covers in it to help out as well.
     
  6. XHitman396

    XHitman396 1/2 ton status

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    K5STEVE's got it, if you have 1st gear, 2nd gear, drive, AND overdrive, it's a 700r-4, if only 1, 2, and drive, then it's a th-350, or a th400, but im not sure to tell the difference in those two....
     
  7. roadnotca

    roadnotca 3/4 ton status

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    tranny

    Check me if I'm wrong, you've built engines before, maybe stick trannies; but not Automagic? If your's is a TH350 or TH400, GET and USE the book(s) by Ron Sessions and you will be rewarded bigtime. Do the beef-up, get a good Master kit like TCI so you can select 1,2 & 3, up and down (fantastic off-road). If it's 700R4, use it for a core. It took a couple of years for even the factory to get it right. Once they're done right, overdrive is kool, but spending that money might be better on an 80LE or whatever is the hot one now. Search in here for "700R4" and see what the consensus is. As you might guess, I've swapped-out my 700 for my built TH350 like above; 3000RPM at 70 MPH. :D
     
  8. 85threeofive

    85threeofive Registered Member

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    thanks

    All you guys frickin rock man, I cant tell you how much I appreciate the help. I just bought this truck with 81k original miles and in perfect running condition. Interior has a dash crack and 1 tear on the drivers carpet. Other than that, shiny black paint (when not muddy*) and Chrome rims with Cooper Tires. I've had 1991 and 1992 Firebirds and a Thunderbird Supercoupe so not to familiar with this truck yet.....Im not sure if I need a rebuild or not but it does shift hard in 1st-2nd, 2nd-3rd, but if u floor it u can barely feel it. :bow: :confused:
     
  9. roadnotca

    roadnotca 3/4 ton status

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    85/305

    1985 305 and 700R4, somebody thought they were getting an economy truck.:crazy: The tranny pan will show which it is. Like I've said elsewhere, 700R4 is extremely picky about fluid level and TVS cable adjustment, make sure those are perfect, and then test. Let us know what u find.:D
     
  10. 85threeofive

    85threeofive Registered Member

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    adjusment

    How would I go about this, havent really dealt with a 700. I did a kickdown cable adjustment on my Thunderbird which was a AOD tranny, other than that, havent messed with Tranny's. BTW I filled up here in Steamboat at 2.45/gallon, 81 dollars :doah:
     
  11. roadnotca

    roadnotca 3/4 ton status

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    700 Q

    Its easy, but I don't have the book in front of me, but then you need to get it in print for yourself. Probably find it in CK5 search! Or you could go to PepBoys and read it, not even pay for the book.
    $81 for gas, if its a truck, must be saddle tanks, or its a Burb w 40 Gal. tank.
    :D
     
  12. 85threeofive

    85threeofive Registered Member

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    gas

    K5 with a 31 gallon tank with high test gas
     
  13. Can Can

    Can Can Pusher Man Staff Member Super Moderator

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    Oh great........here we go again!!!!! :surepal:
     
  14. Can Can

    Can Can Pusher Man Staff Member Super Moderator

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    85- Welcome to CK5, brother!!! :thumb:

    The best advice I can give you regarding your new aquisition is to swap out ALL of the fluids and every filter possible. Fluid condition is a really good way to tell what kind of shape the system you're checking is in.

    As far as the tranny goes, regardless of what you're hearing, 700r4s are a great unit as long as you keep them clean and cool.
     
  15. stano

    stano 1/2 ton status

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  16. roadnotca

    roadnotca 3/4 ton status

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    Trans

    Check with Bowtie Overdrive. I think that's were I read about it, but the 350/400s had an iron pump, 700 was a switch to aluminum & they (GM) couldn't keep it flat (flat enough). The mail-order perf. 700R4 builders won't take cores, shipping would be a pain but they also have to select their cases & pumps. Like I said either this Forum or another, when done right, 700R4 works, but with the 60s & 80s out there, why bother w 700 if there is any problem with it at all?:wink1:
     
    Last edited: Nov 13, 2005
  17. 85threeofive

    85threeofive Registered Member

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    thanks bro

    I appreciate all the help ive been given and will let ya know how it works out.
    Again, you guys rock! :bow:
     
  18. Jagged

    Jagged 1 ton status

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    The only problem I had with the 700R4 that ::was:: in my blazer was the pump seal and bushing. Instead of replacing the seal and whatnot, I just swapped a TH400 and NP205 for the 700R4 and NP208. Never looked back :)

    700R4's are nice if you treat em right, don't overheat it. Flush, and change the filters when necessary. Get a Haynes manual, it tells you how to adjust the TV (or I can see about scanning it or something). There's a vent, I forget what it's called, or where exactly it is, but it's on the top of the tranny... sometimes it gets clogged and will cause leakage problems.

    Lucas and any other 'tranny-fix' type fluids make your seals soft. Yes that helps with leaking and whatnot, but doesn't fix the problem, just prolongs the inevitable.

    If you ask me, unless you really need that overdrive, I'd find a TH350 or a TH400 (preferably) for it instead of the 700R4. You'll need an adapter for the NP208, but if you can score a TH350/NP205 or a TH400/NP205 combo, it's a bolt-in replacement with only needing a longer rear driveshaft (at stock height that is).

    If that 305 ain't enough, put a 350 in. It'll bolt up to the 700R4 without a problem (you can even put the 305 heads on the 350 for higher compression, ****ty flow compared to 350 heads, but you'll boost the compression on the 350).

    I'd change your diff fluid too. Not too many 'regular' owners change that regularly, if at all.
     
  19. roadnotca

    roadnotca 3/4 ton status

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    What He said

    And when you think about it, if you've commited to really heavy tires/wheels you need more HP & torque anyway, you can tolerate a net taller gear ratio, make it all turn slower at 75 MPH, if its all balanced right. I've seen a lot guys with mondo rubber on the highway @ 50 MPH, stayin just under the shimmies. Even more-so if you've got a doubler, let's see, trans in 1, front box in 4H, rear box in 4L; no wait front in 4L, rear in 4H:confused: :crazy: :crazy: . It all starts to be as much bling as the all chrome, don't get me dirty crowd, and thats not CK5. Figure the revs you want at 60 or 65, whatever, then build enough power to push that brick down the road. Face it, we gave-up economy when we bought a rolling livingroom.:D :D I can drive for hours on my bench seat, I'm given a rental when I travel and that bucket hurts after 30 minutes. Fullsize remember? We bought these because they're big and built like a brick crapper.:D :D :D And in a Burb, there's always a place to sleep, out of the mud.:laugh:
     

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