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05-02-2009, 07:16 PM
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#1 |
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Another Day, Another Dollar
Join Date: Nov 2008
Location: North Vancouver, BC
Posts: 1,316
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truck "shuddering" under load in reverse
hey guys,
today while backing up my steep driveway i noticed some fairly intense shuddering coming from somewhere in the drivetrane. you could hear it as well as feel it. i am wondering if it is perhaps the U-Joint? 454 turbo 400 14 bolt full floater 4x4 35's any ideas?
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-78 K20 Cheyenne 454 long box, 4" lift, 35" MT's, '84 cab, '80 box "its hip to be square" 
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05-03-2009, 04:36 AM
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#2 |
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Cheyenne Super
Join Date: Nov 2008
Location: Dallas Texas
Posts: 545
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Re: truck "shuddering" under load in reverse
Was the engine lugging? if not maybe bad motor mount?
Is there a 'CLUNK' when shifting? |
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05-04-2009, 11:08 AM
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#3 |
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Registered User
Join Date: Mar 2007
Location: Farmington, MN
Posts: 928
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Re: truck "shuddering" under load in reverse
Could be the trans. check your fluid. Reverse is usually the first to go.
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I can still count my vehicles on two... wait three hands. |
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05-04-2009, 02:26 PM
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#4 |
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Registered User
 
Join Date: Apr 2005
Location: Medford, MA
Posts: 307
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Re: truck "shuddering" under load in reverse
Mine does the same shuddering thing in reverse, but I've got a standard. It shudders like crazy when I'm feathering the clutch in reverse under load. Like when I'm trying to back up a hill slowly. But since yours is an automatic, I'd check the fluid level and color. Could be the clutches starting to wear out.
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05-04-2009, 03:33 PM
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#5 |
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Registered User
Join Date: Sep 2008
Location: Bailey, NC
Posts: 2,462
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Re: truck "shuddering" under load in reverse
Check the rear transmission mount. If it is broken, it will cause the trans tailshaft to lift up in reverse. That causes the pinion angle to be incorrect, thus causing a shudder.
__________________
Jeramy '84 GMC project truck '85 Chevy 4X4 SOLD '07 Chevy Trailblazer SS 5th Annual SHPHC Car/Truck Show Pics http://67-72chevytrucks.com/vboard/s...d.php?t=543605 UPDATED PICS! CHECK 'EM OUT |
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05-07-2009, 09:11 PM
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#6 |
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Another Day, Another Dollar
Join Date: Nov 2008
Location: North Vancouver, BC
Posts: 1,316
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Re: truck "shuddering" under load in reverse
fluid is good. mounts are good.
its slipping pretty bad now, im going to take it to the tranny shop in the next few days. i just had it rebuilt a few months back so i think (hope) its still under warrenty.
__________________
-78 K20 Cheyenne 454 long box, 4" lift, 35" MT's, '84 cab, '80 box "its hip to be square"
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05-07-2009, 09:31 PM
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#7 |
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Robert Olson Transport
 
Join Date: Oct 2002
Location: recent transplant to NC USA
Posts: 20,277
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Re: truck "shuddering" under load in reverse
stupid question do you have a one piece drive shaft or a split one with the carrier bearing,, ive had bad vibrations from a bad carrier bearing
__________________
Bob 1951 International running on a squarebody chassis "If a man's worth is judged by the people he associates himself with, then i am the richest man in the world knowing some of the fine people of this board" http://67-72chevytrucks.com/vboard/a...t.php?f=25&a=9 (you can review the site rules here!) PM Me for your vehicle/parts hauling needs in the North East US or see my Facebook page Robert Olson Transport Live each day to the fullest.. you never know when fate is going to pull the rug out from under you... I hate cancer!! |
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05-07-2009, 09:32 PM
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#8 |
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Registered User
Join Date: Mar 2009
Location: Midland, Tx
Posts: 418
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Re: truck "shuddering" under load in reverse
Converter?
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1972 GMC C10 |
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05-08-2009, 05:32 AM
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#9 |
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>130dB Moderator
Join Date: Aug 2006
Location: Sacramento, CA
Posts: 2,130
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Re: truck "shuddering" under load in reverse
 Check the timing, steering column, and shift linkage.
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Living Life @ 130dB LED Tail Light Conversion; How-to Friend. Father. Brother. RIP El Jay ------------------------------------------------------------------------------------------------------------------------- CLICK HERE and for less than $0.07 a day, you too can help support and build a better forum. |
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05-08-2009, 08:44 AM
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#10 |
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Junior Member
Join Date: Feb 2005
Location: Huntingburg IN
Posts: 620
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Re: truck "shuddering" under load in reverse
More than likely you are experiencing axle wrap and pinion preload. other than putting a four link in it not really to much you can do about it other than new stiffer leafs or adding a leaf. Sometimes your shocks can be worn out which helps induce it and putting on new shocks can help...
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05-08-2009, 08:20 PM
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#11 |
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>130dB Moderator
Join Date: Aug 2006
Location: Sacramento, CA
Posts: 2,130
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Re: truck "shuddering" under load in reverse
Maybe add traction bars to solve the axle wrap issue?
__________________
Living Life @ 130dB LED Tail Light Conversion; How-to Friend. Father. Brother. RIP El Jay ------------------------------------------------------------------------------------------------------------------------- CLICK HERE and for less than $0.07 a day, you too can help support and build a better forum. |
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05-08-2009, 11:20 PM
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#12 | |
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Registered User
Join Date: Feb 2009
Location: mt. Pleasant, MI
Posts: 246
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Re: truck "shuddering" under load in reverse
Quote:
the thing that really makes me laugh is that the bunny has two pancakes on it's head 
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1974 chevy Cheyenne C10 "The Mutt":4x4 convertion, NP208, 700-R4, stock 350, edelbrock Torker intake, edelbrock 600 CFM carb, duels 2001 Pontiac Grand Prix GT: 3.8L supercharged, 9.2:1 comprestion, ZZP XP cam, home made intake, 2 1/2" exhuast, 10psi of boost 
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05-10-2009, 10:00 PM
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#13 |
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Another Day, Another Dollar
Join Date: Nov 2008
Location: North Vancouver, BC
Posts: 1,316
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Re: truck "shuddering" under load in reverse
took it into the tranny shop.
they said the reverse band?? is slipping. anyhow i had it rebuilt in september and its still under warrenty 
__________________
-78 K20 Cheyenne 454 long box, 4" lift, 35" MT's, '84 cab, '80 box "its hip to be square"
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05-11-2009, 10:17 AM
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#14 | |
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Junior Member
Join Date: Feb 2005
Location: Huntingburg IN
Posts: 620
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Re: truck "shuddering" under load in reverse
Quote:
Traction bars are only going to stop the axle wrap under forward acceleration. |
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05-11-2009, 07:16 PM
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#15 |
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Registered User
Join Date: Mar 2007
Location: Farmington, MN
Posts: 928
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Re: truck "shuddering" under load in reverse
Sweet! Hopefully they are doing the R&R on the trans? I'd be pretty upset if I had to pull it out.
__________________
I can still count my vehicles on two... wait three hands. |
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