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1991 Burb 1/2 ton 4L60E or 4L80E?

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by tomnits, Mar 26, 2002.

  1. tomnits

    tomnits Registered Member

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    1991 4x4 Suburbans, do the 1/2 tons have 4L60E and the 3/4 tons have 4L80E? Or are they all 4L80E?

    Any way to externally identify the the 4L60 from the 4L80? I want to get the 4L80E.

    Thanks guys
    Tom
     
  2. 84_Chevy_K10

    84_Chevy_K10 Banned

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    4L60 and 4L60E is two different trannies. Be careful. A 4L60 also goes by the name 700R4. A 4L60E is the Electronic version of that tranny that uses a computer to shift. The 4L60/700R4 is shifted with a TV cable.

    A 1/2 ton '91 should have a 4L60--with a TV cable and TBI. I don't think the computer (4L60E, the E means electronic)trannies came until at least late in the model year '91 or even into the '92 model year. It's going to either be the 4L60 or 4L60E, one or the other.

    A 3/4 ton '91 Suburban might have a TH 400 or a 4L80E. It's not going to have a 4L60 or 4L60E.

    You'll find out just how bad you want a 4L80E when you price the swap. I'd just buy a high-dollar 700R4 and get it over with. I'd put an Art Carr 700R4 against a 4L80E any day, and it's most likely easier to swap in.
     
  3. woody9

    woody9 1/2 ton status

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    700R4 R models at 8600 GVRW & all V (4x4) models
    4L80-E R models up to 8600 GVRW
    is how the 91 burban spec sheet lists them
     
  4. tomnits

    tomnits Registered Member

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    I'm looking at buying a1991 4x4 Suburban, so I definitely want to get the 4L80 trans, that's why I ask.

    As a side note, for non-computer applications, who makes the module to use the 4L80e with a carbed engine? I thought it was JET, but saw nothing on their site. I was thinking of using the 4L80E on a Cad 500 engine project. Anyone know cost of such a unit?

    Thanks
    Tom
     
  5. 4X4HIGH

    4X4HIGH 1 ton status Premium Member GMOTM Winner

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    The 4L80E must use a computer. You cannot run this tranny any other way. And second, it will not bolt up to a caddy 500 engine. You would need an adapter of some sort.
     
  6. tomnits

    tomnits Registered Member

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  7. Hossbaby50

    Hossbaby50 3/4 ton status

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    The company that offers the "Raptor" 700R-4, builds a 4l80E that doesn't need a computer. It does cost like $3000 though. But it is super stout, and doesn't need the computer.
     
  8. Burbinator

    Burbinator 1/2 ton status

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    Hmmm...

    My '91 V2500 Suburban has a 4L80E. According to that spec it shouldn't. It has a GVWR above 8600 though...
     
  9. u2slow

    u2slow 1/2 ton status

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    The '91 V2500 Burb we had at my old auto-wrecking job had a 4L80E (it was mated to NP241 with 10B front & 14SF rear.) Basically, the dead-wringer is "OD" on the gear selector of a '91 8-lug truck.

    Or if you like getting dirty - here's a handy ID chart just for reference:
    <a target="_blank" href=http://209.53.37.213/~u2slow/tranny/auto_id.gif>http://209.53.37.213/~u2slow/tranny/auto_id.gif</a>

    As an added note, 91-93 diesels with the 4L80E use one of these "tranny babysitters" from the factory.
     
  10. woody9

    woody9 1/2 ton status

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    Burbinator, I agree that sheet reads funny. GM woudn't ever print anything that don't make sense, would it????? (ROFL).
    Guess it means that those 2 trannys were the offerings those years. How they lined up with V or R offerings may have gone astray.
     
  11. Burbinator

    Burbinator 1/2 ton status

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    LOL.../forums/images/icons/smile.gif

    GM lists things wrong? No way! My factory manual states the E-brake cable as going down the right frame rail. That would be a neat trick with the pedal on the left. Someone must have been looking at the microfiche upside down!

    Thanks, Jim...
     
  12. BAJA_BLAZER

    BAJA_BLAZER 1/2 ton status Author

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    Actualy TransGo makes a Full Manual Kit for the 4L80E that is about $250.00 and there are about seven different aftermarket computers available $800 to $1200. I think the best are the CompuShift ($1200) and the TCI ($900) and I would stay away from the Jet unit. It is not a real straight forward conversion and several things need to be taken into consideration. Drive Line lengths, T-case adapters, and which 4L80E to start with in the first place. You can figure $3500 to $6000 to do the conversion.
     
  13. tomnits

    tomnits Registered Member

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    Thanks for all the good replies. I guess I'll make sure I get a Suburban with a 4L80E and use a TH400 on the Cad 500 on the other project. I can't justify the cost of retrofitting the 4L80E to be used in an older vehicle application, since it's just a hobby vehicle.

    Thanks all - Tom
     
  14. AJMBLAZER

    AJMBLAZER Better to be lucky than good. Premium Member

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    4L60E's didn't come around until 1993. I've got a 1992 Blazer K1500 (IFS, yes, I'm selling it/forums/images/icons/tongue.gif) and it's got a 4L60.

    4L60 is just a name change from the TH700R4 that GM did to get away from some of the stigma that was still attached to the TH700R4 back then because of the problems with the 82-86 TH700R4's. Heck, it's still here now./forums/images/icons/tongue.gif

    To fit a Chevrolet/GMC style bolt pattern tranny to a BOP (Caddy too) bolt pattern engine all you have to do is buy the adaptor out of JEGS. Goes for like $55 last I heard. Works well too, seen a guy running a 472 with a 4L80E in a hotrod somewhere on the internet once./forums/images/icons/cool.gif Caddy's get good mileage just because they don't have to work hard to make the truck move, but imagine with an OD gear!/forums/images/icons/smile.gif
     

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