Transfer case not working properly

HRNDZ69

MEMBER
1999 GMC JIMMY
4.3L
6 CYL
4WD
AUTOMATIC
220,000 MILES

I have checked and replaced all vacuum lines and inspected the vacuum actuator and cable going to front differential and everything seems to be working fine. Transfer control module and motor seems to be working properly, with all that being said, I tried to manually shift the transfer case into 2 wheel drive but seems to only shift in 2 gears and not 4, my? Is, should it have 4 different gears, by the way I have the 4 button selector switch.

6 Replies

PORTAFISHING

MEMBER
37 POSTS

My name is Stephen,

If I'm understanding correctly your shifting into 2 wheel drive and your transmission is not shifting in all 4 gears?

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Sunday, February 9th, 2020 AT 5:50 PM

HRNDZ69

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4 POSTS

Hi Stephen,

it's in 4 lo, it acts like it's shifting into different gears, but just goes back to 4 lo.

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Monday, February 10th, 2020 AT 7:03 AM

PORTAFISHING

MEMBER
37 POSTS

Sounds like an actuator problem like it's trying to come out but it's not fully disengaging. So it goes right back into 4 Low. Do you have access to a scan tool?

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Monday, February 10th, 2020 AT 7:26 AM

HRNDZ69

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4 POSTS

No I don't.

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Monday, February 10th, 2020 AT 8:36 AM

HRNDZ69

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4 POSTS

Where would I find the actuator that you are talking about, I know where the actuator is under the battery, and the one on the firewall, but is there another somewhere else?