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  1. #1
    InActive Member


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    Adam
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    1974 Chevrolet Chevelle
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    Default What do I need to swap an LT-1 350 from a 1993 Trans am into a 74 Chevrolet Chevelle?

    I have a 1974 Malibu Classic with a 350 built TH350 trans and 373 gear stock rear end. I have a whole 87,xxx mile LT1 350 1993 Trans am to pull parts from. It does run and drive but 3rd gear on the trans is smoked. I'm looking to use just the engine and whatever else I need to swap the LT-1 into my chevelle. I'm trying to use the same trans and as much as possible on the chevelle and leave as much of the trans am as I can. I do have a fuel cell with a sump and I plan on using an external fuel pump. I've heard that the LT1 bolts right in as long as I don't keep the ac which was the plan anyway. What my question is is what do I need for a harness and pcm to run this engine with the TH350 trans? And what else may come up during this swap that I haven't covered?

  2. #2
    The FABRICATOR!


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    Chris
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    1985 Monte Carlo SS
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    southern illinois
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    Default

    If you are wanting to stay efi, you would be money ahead to convert it to a 94-95 pcm. The 93 is expensive.
    Chris
    1985 Monte Carlo SS
    Mods: 9:1 383 LT1, Ported Trick Flow heads, D1SC Procharger, 4L80E, 3.50 9"
    Check out the M122 MCSS build thread here!

  3. #3
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    Adam
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    Default

    What all do I need to do to convert it to a 94 PCM?

  4. #4
    Xtreme Member


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    Nov 2012
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    Shaun
    Vehicle
    1994 Formula
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    Phillipsburg NJ
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    Supporting Member

    Default

    Quote Originally Posted by LT-1/74Chevelle View Post
    What all do I need to do to convert it to a 94 PCM?
    Easiest would be a 94 harness, or a painless lt1 hotrod harness, a computer, 94 injector and fuel rail and intake assembly, and the 94 sensors

    Sent from my SAMSUNG-SM-G935A using Tapatalk
    2021 Charger Scat 392
    1994 Firebird Formula 381 stroker - Carrying the torch! - 9.90 @ 134.3mph on a 200 shot

    The wrench/driver for LTConvert's 94 Z28- Ellwein 383/LE Trickflows/ D1SC / CPT Ultra Pro Race 4L60E
    10.78 @ 125mph. Shooting for 9.99 for Frank Cahall!

  5. #5
    LTx Guru


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    Fred
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    1994 Formula - SOLD
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    Central NJ
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    Default

    On the other hand, the 93 ECM doesn't control the trans, so life is simpler in that respect.
    SOLD - GONE TO A (VERY) GOOD HOME ! - 94 Formula A3+1: 381ci forged stroker - Callies Stealth, Oliver 5.85 billet rods, BME nitrous pistons / CNC LT4 heads / CC solid roller / TH400+GearVendors OD / 4.11 Strange 12-bolt / 300-shot N2O / Spohn Suspension / roll bar / MoTeC M48 Pro engine management system /a few other odds 'n ends.

  6. The Following User Says Thank You to Injuneer For This Post:


  7. #6
    The FABRICATOR!


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    When you get a harness, if its from an auto car, just tie up any transmission connections or get rid of them if you're positive you'll never run a computer controlled trans again. Program the pcm for a manual transmission and you're golden.
    Chris
    1985 Monte Carlo SS
    Mods: 9:1 383 LT1, Ported Trick Flow heads, D1SC Procharger, 4L80E, 3.50 9"
    Check out the M122 MCSS build thread here!

  8. #7
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    Adam
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    Default

    I currently have the whole car so ill take that idea up with my 93 harness. Thank you

  9. #8
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    Adam
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    Default

    If the 93 PCM doesn't control the trans, then why does it have to be reprogrammed to think its for a manual trans? Sorry if this sounds like a stupid question, I'm just a little puzzled as to why

  10. #9
    The Nitrous Outlet Junkie


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    Troy
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    if you go the 94 PCM and harness way ... i have pulled mine out cause i am going carb
    94 Formula "budget build" #thebeaterbird
    10.177 @128.31 on a lil 250 shot
    350, LT1, carb, LE grind cam, th400, 4k stall, ford 8.8 w/ 4.10s

  11. #10
    LTx Guru


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    Quote Originally Posted by LT-1/74Chevelle View Post
    If the 93 PCM doesn't control the trans, then why does it have to be reprogrammed to think its for a manual trans? Sorry if this sounds like a stupid question, I'm just a little puzzled as to why
    If you go with a 94 PCM as he recommended, the 94 does try and control the trans. Reflashing as a manual eliminates the codes and consequences.
    SOLD - GONE TO A (VERY) GOOD HOME ! - 94 Formula A3+1: 381ci forged stroker - Callies Stealth, Oliver 5.85 billet rods, BME nitrous pistons / CNC LT4 heads / CC solid roller / TH400+GearVendors OD / 4.11 Strange 12-bolt / 300-shot N2O / Spohn Suspension / roll bar / MoTeC M48 Pro engine management system /a few other odds 'n ends.

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