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#4436847 - 06/20/17 03:23 PM Rear end slap
Duffyjr Offline


Registered: 01/13/16
Posts: 508
Loc: Nebraska
Every once in a while when I put my truck (see sig) in reverse it makes a clunking sound, no other time does it do this. So the last time I had my truck into the mechanic I mentioned that and would he check every thing under there. When I picked up the truck he said every thing was solid but what I may be experiencing is rear end slap. He said it's normal for these old trucks but I gotta tell you it scares the heck of me when it happens, it sounds like something under there is breaking.

I have done little searching and apparently this is for real. But my questions is, were they like that when new, is it just the way it's designed or is it wearing out? I also see that guys with newer trucks are having the same thing happen, 2014/15/16.

Truck has 76k but don't know the history.
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#4436852 - 06/20/17 03:30 PM Re: Rear end slap [Re: Duffyjr]
Eddie Online   sleepy


Registered: 12/07/03
Posts: 9569
Loc: Florida, Cape Coral
No expert here but, I'd be checking the universal Joint's and lubricate the splines where the driveshaft enters the rear of the transmission. Ed
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#4436885 - 06/20/17 04:11 PM Re: Rear end slap [Re: Duffyjr]
old1 Offline


Registered: 01/04/11
Posts: 1001
Loc: Columbus Nebraska
I have had many older vehicles that do that. It is just the combination of all the clearances which were tight in the forward direction when stopped, then reversing direction and all the various normal clearances being taken up in the opposite direction. If the u-joints ate good, and surely the mechanic checked them, not to worry. Just don't rev up the engine, then drop it in gear.
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#4436916 - 06/20/17 04:55 PM Re: Rear end slap [Re: Duffyjr]
Elevguy Offline


Registered: 02/19/15
Posts: 64
Loc: Hamburg Michigan
It's the side gears in differential. You may be able to shim them. When I worked at a Mopar dealer in the 70's they had kits for that purpose

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#4437018 - 06/20/17 07:04 PM Re: Rear end slap [Re: Duffyjr]
BrocLuno Offline


Registered: 09/06/15
Posts: 5519
Loc: Kalifornia Kollective
Two piece drive line?
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Formerly in marine engineering. In an earlier life I owned my own petroleum tank truck, and hauled for the majors and independent's.

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#4437031 - 06/20/17 07:18 PM Re: Rear end slap [Re: Duffyjr]
SilverSnake Offline


Registered: 05/29/13
Posts: 592
Loc: Florida
Used to have the same issue with my old Chevrolet and GMC pick ups. Switched to Rams in 2001 and have not had the problem since.
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#4437124 - 06/20/17 09:24 PM Re: Rear end slap [Re: Duffyjr]
Kurtatron Online   content


Registered: 04/06/10
Posts: 168
Loc: Detroit
This thread wins for best thread title.

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