# 2000 silverado rev during shifting **URL:** \ **Category:** Maintenance/Repairs\ **Tags:** chevrolet, transmissions\ **Created:** [November 12, 2018, 10:48pm UTC](https://community.cartalk.com/t/2000-silverado-rev-during-shifting/128724 "2018-11-12T22:48:24Z")\ **Posts on this page:** 4\ **Page:** 1
**Author:** ![Tyler\_Clark](https://avatars.discourse-cdn.com/v4/letter/t/a698b9/32.png) [@Tyler\_Clark](https://community.cartalk.com/u/Tyler_Clark)\ **Post date:** [November 12, 2018, 10:48pm UTC](https://community.cartalk.com/t/2000-silverado-rev-during-shifting/128724/1 "2018-11-12T22:48:24Z")
My 2000 Silverado with a 5.3l v8 engine is shifting funny after a rear main seal was replaced. I replaced it and it was the first time I ever dropped a transmission. I know the seal is in properly but now the Rpms increase when shifting mostly in second and third gear and it’s making me nervous any ideas on what’s wrong? ---
**Author:** ![Tester](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/tester/32/15976_2.png) [@Tester](https://community.cartalk.com/u/Tester)\ **Post date:** [November 13, 2018, 12:28am UTC](https://community.cartalk.com/t/2000-silverado-rev-during-shifting/128724/2 "2018-11-13T00:28:49Z")
You probably disconnected the battery when you did this repair. When you do this, it erases the adaptive memory the PCM has learned. Erasing the PCM’s adaptive memory may also affect the way the transmission shifts and feels. The transmission may not feel the same until the PCM or transmission control module relearns the shift adjustments. This may take 50 to 75 miles of driving. Tester ---
**Author:** ![Tyler\_Clark](https://avatars.discourse-cdn.com/v4/letter/t/a698b9/32.png) [@Tyler\_Clark](https://community.cartalk.com/u/Tyler_Clark)\ **Post date:** [November 16, 2018, 12:53am UTC](https://community.cartalk.com/t/2000-silverado-rev-during-shifting/128724/3 "2018-11-16T00:53:15Z")
It feels way better now I appreciate the response I was really worried I’m trying to Learn this stuff but I should’ve bought a junket to try it out on first not my daily ---
**Author:** ![George\_San\_Jose1](https://avatars.discourse-cdn.com/v4/letter/g/e5b9ba/32.png) [@George\_San\_Jose1](https://community.cartalk.com/u/George_San_Jose1)\ **Post date:** [November 16, 2018, 3:29am UTC](https://community.cartalk.com/t/2000-silverado-rev-during-shifting/128724/4 "2018-11-16T03:29:18Z")
Hopefully it’s just the re-learning thing posted above. Still, w/this system and the fact you removed the transmission to replace the engine seal, it’s a good idea to make sure the transmission fluid level remains correct.