Re: Jack Slapping

[jack@domain.elided (Jack Hagerty)]

>From: JALFAjr@domain.elided

>Jack, just because you have tried most of the other items and they didn't
>affect anything, doesn't mean that you have any idea how thorough (or not) I
>was in researching this.  I changed transmission mounts, donuts, u-joints,
>center support, springs (new stock height, old, new, lowered as currently
>installed) and the only thing that has remained the same since it started, is
>the drive shaft length, the LSD, and the slap. (none of this was done
>specifically to eliminate the slap, just noting that it didn't)

OK, calm down. I think we're coming at this from opposite directions. You
apparantly have been changing those items after the problem started, while
with me the problem started after I replaced most of those things (at least 
the rubber parts) as routine maintenance because they were just flat wearing
out with age.

>I have no quarrel with what Joel says either, as I am not sure it contradicts
>me, as the slap would more likely happen on weak springs, i.e. more chances
>for maximum suspension compression.  Except that my thump doesn't come at
>acceleration from standstill, but while driving down the road at speed and
>then crossing a raised seam in the roadway.  And it really isn't a thump, but
>a "slap".

Mine too. I think I didn't read Joel's post closely enough. I wasn't going
to quarrel with the onomatopoeia of "slap" vs "thump" but I didn't notice
that he said "from a stand still." Mine is definitely only at freeway speeds
over severe bumps (like expansion joints). I can see the sagging springs
causing the driveshaft to collapse to the end of the slip yoke forceing
the shaft to bend at one of the flexible elements (U-joints or donut)
enough to hit the tunnel wall.

I think we're really on the same page here.

- - Jack

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| Jack Hagerty                |                                             |
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