# Shift on the fly 4 wheel drive

**URL:** <https://community.cartalk.com/t/shift-on-the-fly-4-wheel-drive/10509>\
**Category:** Maintenance/Repairs\
**Created:** [February 11, 2008, 2:18pm UTC](https://community.cartalk.com/t/shift-on-the-fly-4-wheel-drive/10509 "2008-02-11T14:18:28Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![denyedjim](https://avatars.discourse-cdn.com/v4/letter/d/a3d4f5/32.png) [@denyedjim](https://community.cartalk.com/u/denyedjim)\
**Post date:** [February 11, 2008, 2:18pm UTC](https://community.cartalk.com/t/shift-on-the-fly-4-wheel-drive/10509/1 "2008-02-11T14:18:28Z")

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i have a 99 chevy blazer zr2 4 wheel drive,when i try to shift to 4 wheel,sometimes it works fine,other times the 4 wheel indicator light just flashes and it won’t go into 4 wheel. what could be causing this?

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**Author:** ![KLRTom](https://avatars.discourse-cdn.com/v4/letter/k/57b2e6/32.png) [@KLRTom](https://community.cartalk.com/u/KLRTom)\
**Post date:** [February 12, 2008, 1:27am UTC](https://community.cartalk.com/t/shift-on-the-fly-4-wheel-drive/10509/2 "2008-02-12T01:27:27Z")

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Have you checked your shift linkage?

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**Author:** ![mconn](https://avatars.discourse-cdn.com/v4/letter/m/9fc348/32.png) [@mconn](https://community.cartalk.com/u/mconn)\
**Post date:** [February 12, 2008, 1:45am UTC](https://community.cartalk.com/t/shift-on-the-fly-4-wheel-drive/10509/3 "2008-02-12T01:45:43Z")

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I assume you have auto hubs…I would check their 2 nd. They may not be engaging.

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**Author:** ![pleasedodgevan](https://avatars.discourse-cdn.com/v4/letter/p/51bf81/32.png) [@pleasedodgevan](https://community.cartalk.com/u/pleasedodgevan)\
**Post date:** [February 12, 2008, 3:34am UTC](https://community.cartalk.com/t/shift-on-the-fly-4-wheel-drive/10509/4 "2008-02-12T03:34:02Z")

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Don’t shift on the fly unless you are going below thirty. Go slower than that.