Dismiss Notice

Welcome To CK5!

Registering is free and easy! Hope to see you on the forums soon.

Score a FREE t-shirt and membership sticker when you sign up for a Premium Membership and choose the recurring plan.

Watch a 4L80 swap video

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by Blazer79, Jul 12, 2001.

  1. Blazer79

    Blazer79 1/2 ton status

    Joined:
    Feb 17, 2000
    Posts:
    1,816
    Likes Received:
    0
    Location:
    Guatemala, Central America
    I just found a 15 minute video recorded from TNN I think. It shows two guys swapping a blown TH400 tranny for a new 4L80 tranny in a motorhome. Since the motorhome didn't have a computer, they installed a tranny computer that even has knobs for adjusting the shift feel and rpm points. Very interesting. They make it look so easy. I think the hardest part for my Blazer would be finding an adapter for my NP203 transfer case. Now I'll have to hunt a 4L80 tranny in the junkyards.

    You'll need the Free Real Player to watch the video. Here' s the link to the page. <A target="_blank" HREF=http://www.autotransinc.com/eplaceview.html>http://www.autotransinc.com/eplaceview.html</A>. Just click on the picture.

    I hope you like it.

    <font color=purple>//////
    <A target="_blank" HREF=http://blazer79.coloradok5.com>http://blazer79.coloradok5.com</A></font color=purple><font color=black>
    Soon a 454 K5!!</font color=black>
    [​IMG]
     
  2. HarryH3

    HarryH3 1 ton status Author

    Joined:
    May 31, 2000
    Posts:
    10,384
    Likes Received:
    2
    Location:
    Georgetown, TX
    That's the fellas from the Shadetree Mechanic show. I saw that episode. The tranny is expensive, but I seem to remember that the computer to run it was several hundred dollars. On gas powered rigs, the tranny is run by the same computer that runs the engine, so the computer won't work right unless it's also running the fuel injection. They used a tranny control computer from a GM diesel powered truck and a custom wiring harness.

    BTW, that tranny is the 4L80E. There was a non-computer controlled version, the 4L80 for a couple of years. The E signifies electronic control of the trans.

    <font color=black>HarryH3 - '75 K5</font color=black>
    <A target="_blank" HREF=http://www.angelfire.com/super/ThunderTruck>http://www.angelfire.com/super/ThunderTruck</A>
    It's a great day to be alive...
     
  3. talldogg

    talldogg 1/2 ton status

    Joined:
    Jul 26, 2000
    Posts:
    754
    Likes Received:
    0
    Location:
    San Diego, CA
    Harry,
    Would that mean that the 4L80 wouldn't need a computer and could run right behind a non-EFI engine? This would still be the bullet-proof OD transmission right??? Just wondering, thanks.

    It's not what you buy, it's what you build!
     
  4. HarryH3

    HarryH3 1 ton status Author

    Joined:
    May 31, 2000
    Posts:
    10,384
    Likes Received:
    2
    Location:
    Georgetown, TX
    Yep, if you can find a 4L80 then it will bolt right up and work. It uses hydraulic shift logic. I think you just have to come up with a way to lock the torque converter, like you do with a 700R4.

    <font color=black>HarryH3 - '75 K5</font color=black>
    <A target="_blank" HREF=http://www.angelfire.com/super/ThunderTruck>http://www.angelfire.com/super/ThunderTruck</A>
    It's a great day to be alive...
     
  5. BAJA_BLAZER

    BAJA_BLAZER 1/2 ton status Author

    Joined:
    May 17, 2001
    Posts:
    517
    Likes Received:
    1
    Location:
    San Diego, CA
    To the best of my knowledge there never was a 4L80 (visit http://www.v8s-series.freeservers.com/trans.htm). The 4L80E is electronic, there is no non-electronic version available. I believe there was a Motorhome version called the MT1 with different gear ratios, but still electric. There are at least 5 manufactures of aftermarket computerized controllers for these tranys that I have found. None of them require a fuel injected motor or the factory computer. The undisputed expert for GM overdrives (700R4, 4L60E, and 4L80E) is Steve Holmes at Bowtie in Hisperia? So. Cal.
    http://bowtieoverdrives.com/index.htm Steve has a controller that is full programable with your Laptop and I would recommend it.

    JET sell built 4L80Es and a controller, but I wouldn't recomend them for several reasons (they have to program it for you and they charge a arm and a leg to do it).

    TCI has a good unit.
    http://www.tciauto.com/electronics/index.htm

    Premier Preformance has one.
    http://www.findarticles.com/cf_offrd/m1185/n4_v31/19168103/p1/article.jhtml

    Ramsey
     
  6. HarryH3

    HarryH3 1 ton status Author

    Joined:
    May 31, 2000
    Posts:
    10,384
    Likes Received:
    2
    Location:
    Georgetown, TX
    Hmm, I thought they had made the 4L80 for a year or two. Maybe I'm thinking of the 4L60. [​IMG]

    <font color=black>HarryH3 - '75 K5</font color=black>
    <A target="_blank" HREF=http://www.angelfire.com/super/ThunderTruck>http://www.angelfire.com/super/ThunderTruck</A>
    It's a great day to be alive...
     
  7. 84_Chevy_K10

    84_Chevy_K10 Banned

    Joined:
    May 30, 2001
    Posts:
    17,669
    Likes Received:
    0
    Location:
    IL, USA
    4L60 = 700R4, same thing
    4L60E = Electronic version of the above

    There never was a 4L80. The 4L80E came out in mid-1991 and is essentially an overdrive version of the TH 400 that it replaced.

    Tim
    '84 Chevy K10, lifted, loud, fast, and 3/4 ton axles
     
  8. 502Burban

    502Burban 1/2 ton status

    Joined:
    Jun 8, 2001
    Posts:
    379
    Likes Received:
    0
    Location:
    Southern California
    Yep! You can run the 4L80E in a non-EFI engine. I have one behind my 502. I like the idea of the strenth of a TH400, but with the 4th gear overdrive at .70:1. Bought it from Jet Transmissions. However, I agree with Baja Blazer about Jet's ECU for the trans. Not as full-featured as the TCI ECU, which I will be running.

    TCI's computer allows you to custom program just about anything you want with the 4L60E or 4L80E transmissions, and run either one without a computer-controlled engine. You can just program in your tire size, gear ratio and trans type and be on your way. Or, you can adjust things like full-throttle and part-throttle shift-points and check everything with full data-logging. Pretty cool. [​IMG]

    Robb
    '73 GMC Suburban - 502DFI
    <A target="_blank" HREF=http://community.webshots.com/user/robbrj>http://community.webshots.com/user/robbrj</A>
     
  9. Blazer79

    Blazer79 1/2 ton status

    Joined:
    Feb 17, 2000
    Posts:
    1,816
    Likes Received:
    0
    Location:
    Guatemala, Central America
    What kind of adapter are you using to connect your NP205 to the tranny? I guess that same adapter would work with my NP203, since both are 27 spline, right?

    <font color=purple>//////
    <A target="_blank" HREF=http://blazer79.coloradok5.com>http://blazer79.coloradok5.com</A></font color=purple><font color=black>
    Soon a 454 K5!!</font color=black>
    [​IMG]
     
  10. 502Burban

    502Burban 1/2 ton status

    Joined:
    Jun 8, 2001
    Posts:
    379
    Likes Received:
    0
    Location:
    Southern California
    It's the same adapter that is used for the TH400 to NP205 combo. However, I had to change the NP205 input shaft to the longer version to get the proper engagement between the two pieces. Also had to machine the adapter to accept the o-ring seal from the 4L80E, and shave about 3/8" from the output shaft on the transmission so that it wouldn't bottom-out in the t-case input shaft.

    As for your NP203, I'm not very familiar with them. If they use the same adapter as the TH400 to NP205 combo, then you would be in good shape.

    Robb
    '73 GMC Suburban - 502DFI
    <A target="_blank" HREF=http://community.webshots.com/user/robbrj>http://community.webshots.com/user/robbrj</A>
     
  11. BAJA_BLAZER

    BAJA_BLAZER 1/2 ton status Author

    Joined:
    May 17, 2001
    Posts:
    517
    Likes Received:
    1
    Location:
    San Diego, CA
    Rob,

    You should call Bowtie. Steve used to recomend the TCI unit but has recently started using a new one that I do not recall the manufacturer of, that he says is even better and I believe cheaper. Your 4L80E/205 combination sounds great I would like to hear more about it.

    Ramsey
     
  12. 88streetblaze

    88streetblaze 1/2 ton status

    Joined:
    Jun 27, 2001
    Posts:
    314
    Likes Received:
    0
    Location:
    middle of sticks, oklahoma
    the 700r4 and 4l60 are not the same.
    the 4L60 is supposed to be a reworked turbo 350 that is electronicly controlled with overdirve and the 4L80 is a 400.
     
  13. 502Burban

    502Burban 1/2 ton status

    Joined:
    Jun 8, 2001
    Posts:
    379
    Likes Received:
    0
    Location:
    Southern California
    Ramsey,

    Thanks for the tip on Bowtie. I'll give them a call. Until the money is spent, I'm always up to hearing about a possible better solution; especially when it comes to electronics. The improvements seem to come at such a rapid rate. [​IMG]

    I'd be happy to share any info I can about the trans/t-case combo. You can PM me, if you like, or just post any ?? you may have. Like most others here, I check this board at least once a day. [​IMG]

    Robb
    '73 GMC Suburban - 502DFI
    <A target="_blank" HREF=http://community.webshots.com/user/robbrj>http://community.webshots.com/user/robbrj</A>
     

Share This Page