imarcr2
imarcr2 New Reader
12/8/13 7:17 p.m.

2007 1500 2wd work truck with 4.8 and 4 speed auto. Today it started having a vibration I could feel thru the floorboard and hear slightly when shifting from 2nd to third gear especially when lightly accelerating. Doesn't seem to happen on the first to second or third to fourth shift.

What say you GRM?

JKleiner
JKleiner Reader
12/8/13 7:43 p.m.

U-joint.

Jeff

imarcr2
imarcr2 New Reader
12/8/13 7:47 p.m.

Jeff, does it make sense that I only notice it on the 2-3 shift?

gofastbobby
gofastbobby Reader
12/8/13 8:12 p.m.

trans shudder?

imarcr2
imarcr2 New Reader
12/8/13 8:19 p.m.

Truck has just under 30k with no towing or heavy use

gofastbobby
gofastbobby Reader
12/8/13 8:31 p.m.

I may have to retract my previous comment. The common flaw with the 4l60e is a 2-3 shift flare. I knew it was something, but didn't remember accurately.

imarcr2
imarcr2 New Reader
12/8/13 8:50 p.m.

I will have to experiment tomorrow but I think the problem is only noticeable under light acceleration. When I accelerated hard, either the trans didn't have the vibration or it shifted quick enough so that I didn't hear it.

Shift flare appears to be a problem mostly with full throttle shifts....according to a quick search via google

gofastbobby
gofastbobby Reader
12/8/13 8:57 p.m.

yeah. I know it's not even close to the same vehicle, but my mustang will shudder under light throttle during shifts. under more than 1/4 throttle its not noticeable.

imarcr2
imarcr2 New Reader
12/8/13 9:01 p.m.

Thanks guys, I will experiment more tomorrow to really isolate when the vibration occurs

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