2004 Chevy Silverado shutter, shakes, RPM changes under lig

SHEPHERDK

MEMBER
2004 CHEVROLET SILVERADO

Shakes or Wobbles problem
2004 Chevy Silverado V8 Two Wheel Drive Automatic 90K miles

When under light load the truck shutters, and shakes at speeds of 45 mph. Accelerate past this speed and its OK. Under this speed its OK. Seems to shift normally.

Changed plugs and wires, have same problem.

Dont know what to check, Transmission, U-Joints, fuel filter?

No engie codes.

4 Replies

DOCFIXIT

MECHANIC
18,828 POSTS

May have problem with the lock up torque convertor solenoid. At about that speed convertor clutch locks giving final drive ratio if there is a fault the convertor will engage and disengage causing shutter. Press above the convertor stays locked below it 's diengaged

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Monday, December 29th, 2008 AT 9:13 AM

SHEPHERDK

MEMBER
2 POSTS

I appreciate your information very much. I have learned a lot about torque converters, auto transmissions and drive line componnents.
Turns out the rear Universal Joint was bad, the torque converter was locking up at speeds just over 40 mph, tapping the brake, the rpm increased about 250rpm and proved the torque converter released. When the vibration occured speeding up or slowing down got past the primary vibration of the U joint. Manually checking the U joint proved it to be the problem. Replacing both front and back U joints cost about $150.
Thanks you very much for your input, with a bit more research I am sure I saved literally thousands of dollars.

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Wednesday, December 31st, 2008 AT 9:04 AM

DOCFIXIT

MECHANIC
18,828 POSTS

Good job U-joints that is one I will remember

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Thursday, January 1st, 2009 AT 3:40 PM

HONDAMIKE

MECHANIC
71 POSTS

Same symptoms with my Silverado (vibration - tap brakes/accel and goes away). Is solenoid the problem, or does torque converter need to be replaced?

Thanks!

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Thursday, May 5th, 2011 AT 2:50 PM