1-2 Shift Bump/Knock/Shake - 2000 LS

**WhiteSilver** · 05-17-2009, 08:08 PM

Hey guys, I've got a 2000 Silverado LS (5.3L) with 110k on the clock and sometimes, usually after it heats up, when I'm accelerating slowly and it goes to shift into second gear, I feel a bumping/shaking/knocking for a second or two. It reminds me of wheel hop but its more subtle than that. I read somewhere that it might be a shift servo? Anyone experience this before? Is there a way to correct/fix this?

Also, does anyone know what transmission I have in my truck or how I can find out?

Thanks in advance.

**WhiteSilver** · 06-04-2009, 01:33 AM

No one has any idea?

**Jimmiee** · 06-04-2009, 09:34 AM

Originally Posted by WhiteSilver

Hey guys, I've got a 2000 Silverado LS (5.3L) with 110k on the clock and sometimes, usually after it heats up, when I'm accelerating slowly and it goes to shift into second gear, I feel a bumping/shaking/knocking for a second or two. It reminds me of wheel hop but its more subtle than that. I read somewhere that it might be a shift servo? Anyone experience this before? Is there a way to correct/fix this?

Also, does anyone know what transmission I have in my truck or how I can find out?

Thanks in advance.

You have a 4L60E transmission. Your servo piston has seals that usually do not wear out. The chatter may be from a weak EPC <electronic pressure control> solenoid but it could be caused by any number or other problems. Have you checked for codes?