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Rear end slap #4436847
06/20/17 03:23 PM
06/20/17 03:23 PM
Joined: Jan 2016
Posts: 782
Nebraska
Duffyjr Offline OP
Duffyjr  Offline OP

Joined: Jan 2016
Posts: 782
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.


89 GMC Sierra VWB 5w30/TG3980
08 Lucerne CX Magnatec 5w30/TG3387A
02 DeVille VWB 5w30/CQ Blue
18 Toro Super Recycler T5 10w30
Re: Rear end slap [Re: Duffyjr] #4436852
06/20/17 03:30 PM
06/20/17 03:30 PM
Joined: Dec 2003
Posts: 10,092
Florida, Cape Coral
Eddie Offline
Eddie  Offline

Joined: Dec 2003
Posts: 10,092
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


CX5 Touring 2.5L :-)
Re: Rear end slap [Re: Duffyjr] #4436885
06/20/17 04:11 PM
06/20/17 04:11 PM
Joined: Jan 2011
Posts: 1,083
Columbus Nebraska
old1 Offline
old1  Offline

Joined: Jan 2011
Posts: 1,083
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.


2017 Nissan Frontier 4.0 5w30
1965 Mustang 200 c/4 10w30 QS defy
1964 Ford Ranchero 302 c/4 15/40 Delo
1929 ford model A No filters, and 15/40 oil
Re: Rear end slap [Re: Duffyjr] #4436916
06/20/17 04:55 PM
06/20/17 04:55 PM
Joined: Feb 2015
Posts: 67
Hamburg Michigan
Elevguy Online content
Elevguy  Online Content

Joined: Feb 2015
Posts: 67
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

Re: Rear end slap [Re: Duffyjr] #4437018
06/20/17 07:04 PM
06/20/17 07:04 PM
Joined: Sep 2015
Posts: 6,179
Kalifornia Kollective
BrocLuno Offline
BrocLuno  Offline

Joined: Sep 2015
Posts: 6,179
Kalifornia Kollective
Two piece drive line?


Formerly in marine engineering. In an earlier life I owned my own petroleum tank truck, and hauled for the majors and independent's.
Re: Rear end slap [Re: Duffyjr] #4437031
06/20/17 07:18 PM
06/20/17 07:18 PM
Joined: May 2013
Posts: 704
Florida
SilverSnake Offline
SilverSnake  Offline

Joined: May 2013
Posts: 704
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.


2016 Charger, 6.4L-485 HP (PUP 0W-40)
2017 BMW 330i, 2L-248 HP (BMW 0W-20)
2018 Jeep GC, 5.7L-360 HP (PUP 5W-20)
2008 20KW Generac (Amsoil 10W-30/30)
Re: Rear end slap [Re: Duffyjr] #4437124
06/20/17 09:24 PM
06/20/17 09:24 PM
Joined: Apr 2010
Posts: 235
Detroit
Kurtatron Offline
Kurtatron  Offline

Joined: Apr 2010
Posts: 235
Detroit
This thread wins for best thread title.

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