clunk from 3rd to 2nd in 2.8 tip, but only under heavy braking

**loustylez** · 04-24-2008 03:45 PM

What would cause a clunk when downshifting from 3rd to 2nd in a 2.8 30v auto/tip (does it in both modes) when braking for a stop. But, if I roll up to the slop slowly, it won't do it. Also, I can brake hard for the stop but let off on the brake right when I know it's going to clunk and it'll shift smoother too.

The point in which it downshifts and clunks seems to take place right at the torque split "dead spot" that the 2.8's are known for. Obviously that makes sense that it would clunk at the spot it's supposed to shift, but I dunno, makes me think tranny/diff mounts?

Only thing I have to go off of is that supposadly a magnet may have gone through the tranny from getting knocked out of the bottom of the tranny pan since a mechanic noticed a dent on the pan that looked like something had been ran over. He showed me some debris in the oil when I had it flushed but to this day I'm not 100% sure that's the culprit.

I will say that I recently fought a CEL issue with cat inefficiency and when I'd reset the CEL the car would drive MUCH smoother. All I've done is used defoulers on the rear o2's to get rid of the CEL but it hasn't seemed to been driving any better.

**andyrew** · 04-24-2008 05:42 PM

Might also be your driveshaft carrier bearing.

How many miles do you have?

**loustylez** · 04-24-2008 07:13 PM

132k

you have no idea how happy i'd be with this car if i could fix this. else, i'm looking to sell.

what are some things to look for under the car?

**andyrew** · 04-24-2008 07:44 PM

If it is your driveshaft carrier bearing or a joint in the driveshaft, you could take off the heat shield over the driveshaft and give it a tug looking at the carrier bearing, notice if there is any tears or such or if it moves quite a bit. That clunk could be the driveshaft jumping up and down under differing power loads.

**Tiluleshpingen** · 04-24-2008 08:02 PM

sounds like bad motor mount.
does it actualy sound like "thud"?

**andyrew** · 04-24-2008 08:50 PM

One option is to get it on a lift and take a pry bar to all the mounts and everything and give it some pressure to see if anything moves... That will help determine if you have any bad mounts..