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97 4L60e 94 caprice wiring harness 95 LT1, won't shift

Old 04-28-2019, 07:06 AM
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97 4L60e 94 caprice wiring harness 95 LT1, won't shift

Everything works fine except it won't shift.
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Old 04-28-2019, 08:22 AM
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Re: 97 4L60e 94 caprice wiring harness 95 LT1, won't shift

Please clarify or confirm:

- you are using a 1997 4L60E

- you are using a 1994 Caprice wiring harness

- it is in a 1995 F-Body chassis

- what year PCM are you using?

- does it shift manually?

There are significant differences between the 1994, 1995, and 1996/1997 4L60E transmissions, with regard the the converter lock-up wiring, types and internals. Perhaps this is contributing to your problem.

Just a guess.

4L60E year differences and interchanges.
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Old 04-28-2019, 08:31 AM
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Re: 97 4L60e 94 caprice wiring harness 95 LT1, won't shift

- I AM using a 1997 4L60E

- I AM using a 1994 Caprice wiring harness Exact description from Seller (1994 Chevy Caprice 9C1 Impala SS LT1 5.7 4L60E ECM Engine Wiring Harness)

- It is in a 1990 Chevy C3500 Dually

- I do my own programming with C.A.T.S. Pretty sure it's flashed at a 1995.

- does it shift manually? ----- if it does, I don't know how to make it do it.

I am aware of the differences in the years and that if you have a 95 you need a 95 trans. I never thought it would actually "not shift"
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Old 04-28-2019, 01:13 PM
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Re: 97 4L60e 94 caprice wiring harness 95 LT1, won't shift

Did you read the part about the 1996/97 changes making the valve body, 3-2 solenoid and separator plate incompatible with the 1995 trans. Add in that trying to use a 95 PCM puts it in limp mode. I'm no an auto trans person, but seems that might have something to do with it. Admittedly just guessing. I think I've explained in the past there doesn’t seem to be many (if any) people left on this site that want to answer trans questions.

By “shift manually” I mean using the manual selector lever. Your 7 word post didn’t provide a lot of info to work with.

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Old 04-29-2019, 12:01 AM
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Re: 97 4L60e 94 caprice wiring harness 95 LT1, won't shift

I guess I missed that part about the 97 transmission being incompatible I tried flashing it as a 94 Caprice police cruiser didn't change anything I guess I didn't expect it to.
I did find a video

https://youtu.be/__8nVV6lR7Q

Last edited by rrwebster; 04-29-2019 at 06:28 AM. Reason: Spelling
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Old 04-29-2019, 10:49 AM
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Re: 97 4L60e 94 caprice wiring harness 95 LT1, won't shift

I gave you a link to another site in response your other post. Probably a better chance of getting help there, since there are more people doing unusual swaps.
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Old 04-29-2019, 11:21 AM
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Re: 97 4L60e 94 caprice wiring harness 95 LT1, won't shift

Thank you!!!
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Old 04-29-2019, 11:31 AM
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Re: 97 4L60e 94 caprice wiring harness 95 LT1, won't shift

Can't find that link on the other post.... is that here?? or on LS1 board?
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Old 04-29-2019, 04:21 PM
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Re: 97 4L60e 94 caprice wiring harness 95 LT1, won't shift

Your other post from yesterday in the “.bin files” thread.

https://www.camaroz28.com/forums/com...-files-460017/
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