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Author Topic: 2002 z71 transmission promblem  (Read 271 times)

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Dramarcus1983

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2002 z71 transmission promblem
« on: July 8, 2019, 13:29:03 PM »

OK guys i need help here. I bought and 02 z71 from this lady. she told me that the shift solenoids need to be changed out. there for i took my little happy camper self down to auto zone and go it. basically when i driving the truck home it wouldn't shift out of first gear and the rpm basically red lined. also it wasn't going over 30 may be 40 mph. once i changed out the 1,2,and 2,3 solenoids and the filter and stuff like that the truck now gets up to about 60 mph before red linen.

so I'm asking is there more solenoids that needs to be change out because my truck is not shifting proper  and i have no ideal. i can get in it and drive but it will not shift at all thru the gears it just go.
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EXT4ME

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Re: 2002 z71 transmission promblem
« Reply #1 on: July 8, 2019, 17:48:35 PM »

Sounds like it's time for a rebuild.

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2004 Cadillac Escalade EXT, White Diamond, New Shale front seat leather from The Seat Shop. WeatherTech FloorLiner DigitalFit. Powerflow Pro-Fit Splash Guards. Arnott/Bilstein front shocks and rear air shocks with Arnott air compressor kit. Refinish Restorer. SeaFoam. Goodyear (Now Continental) Gatorback belts. Goodyear Assurance CS TripleTred All-Seasons.

MS03 2500

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Re: 2002 z71 transmission promblem
« Reply #2 on: July 8, 2019, 22:06:52 PM »

You bought a AV with a non shifting transmission, if it was a easy fix I'm sure the owner would have fixed it herself. But things you want to look at is the wiring and fuses. The pcm controls the tranny shifting.

Just a FYI when buying a car with known issues expect that part will have to be replaced
« Last Edit: July 9, 2019, 14:49:01 PM by MS03 2500 »
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2003 2500

enoniam

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Re: 2002 z71 transmission promblem
« Reply #3 on: July 9, 2019, 06:05:27 AM »

Assuming both of your replaced solenoids are working correctly, it sounds like your 3-4 clutches, which engage in 3rd and 4th gears, are shot.  What's the mileage on the truck?
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2003 with ATK 460 HP 6.0, Speed Engineering Long Tube Headers and true dual 3" exhaust, Truetrac rear, 3200 Circle D Stall, tranny upgraded with 4L65 and other heavy-duty parts, Weld Racing 18x10 forged wheels, HPTuners custom tune, Vortech supercharger, water/meth injection, Magnavolt fuel pump voltage booster, DeatschWerks booster fuel pump, 58#/hr injectors, 13.3 @ 101 in the quarter mile.

Dramarcus1983

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Re: 2002 z71 transmission promblem
« Reply #4 on: July 9, 2019, 11:52:56 AM »

right now the mileages is at 201,000..
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enoniam

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Re: 2002 z71 transmission promblem
« Reply #5 on: July 9, 2019, 13:06:24 PM »

You're at a mileage where the transmission if it hasn't been rebuilt already it's about due.
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2003 with ATK 460 HP 6.0, Speed Engineering Long Tube Headers and true dual 3" exhaust, Truetrac rear, 3200 Circle D Stall, tranny upgraded with 4L65 and other heavy-duty parts, Weld Racing 18x10 forged wheels, HPTuners custom tune, Vortech supercharger, water/meth injection, Magnavolt fuel pump voltage booster, DeatschWerks booster fuel pump, 58#/hr injectors, 13.3 @ 101 in the quarter mile.

Dramarcus1983

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Re: 2002 z71 transmission promblem
« Reply #6 on: July 9, 2019, 21:36:47 PM »

ok i was thinking about just throwing a new one in there. i really appreciate the advice
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Dramarcus1983

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Re: 2002 z71 transmission promblem
« Reply #7 on: July 9, 2019, 21:38:09 PM »

one last thing when i changed out the solenoids the truck ran allot stronger and like i said the i got up in speed but was not shifting
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MS03 2500

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Re: 2002 z71 transmission promblem
« Reply #8 on: July 9, 2019, 22:37:31 PM »

Why not let a tranny shop look at it first.
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Dramarcus1983

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Re: 2002 z71 transmission promblem
« Reply #9 on: July 11, 2019, 10:21:50 AM »

yeah that was my next option ir just saying screw it and putting a whole new tranny in
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