# Rear balance shaft bearing failure in 1999 Chevrolet S-10 **URL:** \ **Category:** Maintenance/Repairs\ **Tags:** chevrolet, s-10\ **Created:** [June 17, 2018, 5:55pm UTC](https://community.cartalk.com/t/rear-balance-shaft-bearing-failure-in-1999-chevrolet-s-10/119369 "2018-06-17T17:55:44Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![MichaelRasmusson](https://avatars.discourse-cdn.com/v4/letter/m/a9a28c/32.png) [@MichaelRasmusson](https://community.cartalk.com/u/MichaelRasmusson)\ **Post date:** [June 17, 2018, 5:55pm UTC](https://community.cartalk.com/t/rear-balance-shaft-bearing-failure-in-1999-chevrolet-s-10/119369/1 "2018-06-17T17:55:44Z")
Anyone else have an issue with the 4.3 V6 taking out the rear balance shaft bearing? Mine did it when I hit resume on the cruise and it down-shifted the transmission too far and within 3 seconds had over-sped the engine. ---
**Author:** ![Mustangman](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/mustangman/32/44130_2.png) [@Mustangman](https://community.cartalk.com/u/Mustangman)\ **Post date:** [June 18, 2018, 1:52am UTC](https://community.cartalk.com/t/rear-balance-shaft-bearing-failure-in-1999-chevrolet-s-10/119369/2 "2018-06-18T01:52:05Z")
That’s a new one. I’v e never heard of that type failure on a 4.3. They usually soldier on nearly forever with minimal fuss. Why did the tranny down shift too far? ---
**Author:** ![MichaelRasmusson](https://avatars.discourse-cdn.com/v4/letter/m/a9a28c/32.png) [@MichaelRasmusson](https://community.cartalk.com/u/MichaelRasmusson)\ **Post date:** [June 18, 2018, 5:44am UTC](https://community.cartalk.com/t/rear-balance-shaft-bearing-failure-in-1999-chevrolet-s-10/119369/3 "2018-06-18T05:44:17Z")
I do not know. Cruise had always seemed to work OK, but I had never hit Resume at 40 mph when I had it set at 70. I was enjoying the fast acceleration until I hit 55 and realized it was not going to upshift. I got cruise shut off just and the noise started. I drove it the 3 miles to my neices yard and parked it. By then the main and rod bearings were gone also. The 99’s had a balance shaft added between the banks to make the engine run smoother- not like my 91 S15 that shakes your pants legs at idle. For some reason GM decided to just use a bronze bearing at the rear, subject to extreme wear at high rpm. I ended up getting a new rebuild engine put in- took me 5 years to save up the money and the wait added more problems to fix.