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Thread: 4l60e help

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    Default 4l60e help

    I have a 1994 z28 the trans went out so I bought another from local shop .my transmission has 12 pins in the case the one I bought from the shop has 13 pins in the case will it work in my 94 ? This is the numbers off the one I bought 7chd255h is this a 1994 4l60e my tras mission numbers or 4ffd2. H .will it work or do I take it back?

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    Quote Originally Posted by Marvin Boleware View Post
    I have a 1994 z28 the trans went out so I bought another from local shop .my transmission has 12 pins in the case the one I bought from the shop has 13 pins in the case will it work in my 94 ? This is the numbers off the one I bought 7chd255h is this a 1994 4l60e my tras mission numbers or 4ffd2. H .will it work or do I take it back?
    No, it's a newer pwm style, the lock up won't work right and when it down shifts it'll go 4th neutral 2nd instead of 4th-2nd. @Cahall

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    Quote Originally Posted by Tubby Z28 View Post
    No, it's a newer pwm style, the lock up won't work right and when it down shifts it'll go 4th neutral 2nd instead of 4th-2nd. @Cahall

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    Same reason u needed the different trans in the impala with the obd1 conversion???

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    Quote Originally Posted by popo8 View Post
    Same reason u needed the different trans in the impala with the obd1 conversion???

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    Correct, Frank had to put an obd1 valve body/harness/standard lockup pump in it. Remember at dyno day how hard it was downshifting? That was why.

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    No it will not work.
    94 trans am forged 355, le 21* trickflows, le cam, a4 3800 stall

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    Pull the pan on the trans you bought and see if it actually has a PWM solenoid. All aftermarket harnesses have 13 pins because they're universal. The PWM solenoid sticks out of the front of the valve body, on the passengers side. There will be a similar solenoid on the drivers side for 3-2 downshift. You can also look for the letters "PWM" cast in the front of the pump. If it has the letters "PWM" and/or the PWM solenoid, it won't work.
    There's a "sticky" in the drivetrain section explaining the differences.

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    Quote Originally Posted by Cahall View Post
    Pull the pan on the trans you bought and see if it actually has a PWM solenoid. All aftermarket harnesses have 13 pins because they're universal. The PWM solenoid sticks out of the front of the valve body, on the passengers side. There will be a similar solenoid on the drivers side for 3-2 downshift. You can also look for the letters "PWM" cast in the front of the pump. If it has the letters "PWM" and/or the PWM solenoid, it won't work.
    There's a "sticky" in the drivetrain section explaining the differences.

    Frank
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    Default

    Thanks guys. The one I bought don't have pwm on the front of the pump . I looked up the numbers 7chd and it came out of a 1997 2500 van

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    So if don't have pwm stamped on the pump and don't have the solenoids it will work?

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    Quote Originally Posted by Marvin Boleware View Post
    So if don't have pwm stamped on the pump and don't have the solenoids it will work?
    You can't always go by the numbers on the case. 4L60E cases were interchangeable from 1993-1997. The case and internal wiring harness may have both been swapped. If the pump doesn't have the "PWM" stamped in it, it's definitely a non PWM pump. I would just check and confirm on the solenoid. Pull the pan and take a couple pictures and post them. I'll let you know what you have.

    Frank
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