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Thread: 350 TBI + 4L60E S10 Swap Computer Questions

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  1. #1
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    If you can get a wiring harness from a TBI S10 you will probably save yourself some work. There are a bunch of differences between the W code truck and the Z code. Many of the 93-94 trucks came with a CPI engine. That harness will be close but it will be short a set of wires for one of the TBI injectors.

  2. #2
    Super Moderator dave w's Avatar
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    1995 S10 VIN W - VCM wiring schematics attached.
    Attached Files Attached Files

  3. #3
    Fuel Injected!
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    i think 95 was when the s10 changed body style n

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    Super Moderator dave w's Avatar
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    Quote Originally Posted by dave w View Post
    1995 S10 VIN W - VCM wiring schematics attached.
    After reviewing the VIN W - VCM wiring schematics the 96 ~ 99 Vortec 5.7 engine with a Black Box PCM or '0411 PCM would be a better option.

  5. #5
    Super Moderator dave w's Avatar
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    Quote Originally Posted by dave w View Post
    After reviewing the VIN W - VCM wiring schematics the 96 ~ 99 Vortec 5.7 engine with a Black Box PCM or '0411 PCM would be a better option.
    More schematics, possibly helpful?

  6. #6
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    Thanks for the replies everyone, I already bought the 7427 computer before the other replies came through. I will figure out how to make that work.

    My main goal with this truck is to get it moving, not necessarily to get max HP. Is there anything I should change in the tune other than gear ratio and tire size? I am still working my way through the beginner tune pro thread.

  7. #7
    Super Moderator dave w's Avatar
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    I’m not sure about the S10 you have, the full size 1995 4L60E transmissions are a “one year only” because the torque converter lockup is pulse width modulation (PWM).

  8. #8
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    There are many ways to make the 7427 work. Keep in mind that a changing directions with your PCM may be much cheaper than buying connectors and sensors necessary for using the '95 harness with the older pcm.

    I have owned a few S10's and I do still remember a few interesting things about them. For example, using a full-size truck transmission in my '95 Blazer required changing the transmission to transfer case adapter and it required cutting ears off the bottom of the bellhousing so the braces from the engine mounts would fit.

    The S10 transmissions generally used converters with a higher stall speed than a V8 powered truck. These converters work with a V8 but a stock engine will not be able to apply torque immediately off idle as it could do with a truck converter. The S10 transmissions used fewer clutches in at least one clutch pack and some folks worry that can lead to reliability issues with V8 swaps. As mentioned, a '95 transmission will have a different TCC strategy and may not work well with an older pcm. I think if I were planning to use an older computer I would also use an older transmission from a full size truck if possible.

    94/95 was the beginning of a new generation of S10 and trucks from these years were designed knowing OBDII was coming. There were many changes over the previous generation of trucks. For example, it would be wise to check the wiring diagrams to see what component sends a signal to the speedometer and to make sure, if it's the pcm, that the 7427 can provide the same signal. If you are planning to use cruise control it would be a good idea to see if the older truck uses the same cruise configuration. Things like power steering hose threads may need to be checked, and A/C controls and wiring if retaining A/C. If you are going to TBI you may need to install additional circuits to power the second TBI injector.

    There are some interesting solutions for radiator mounting out there... be sure to look at other folks' solutions. Even the engine mounts may not match up correctly. JTR books were good about pointing out these types of issues.

    Good luck!

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