Vibrations in lockup - Dodge Cummins Diesel Forum
94-98 Powertrain Discussion of components that are directly involved in the power production and all that is needed to get and keep the truck moving . Engine , Transmission Ect...NO ADVERTISING

 
LinkBack Thread Tools Display Modes
post #1 of 9 (permalink) Old 03-22-2012, 12:41 AM Thread Starter
Cummins Fanatic
 
TYONEON's Avatar
 
Join Date: Dec 2010
Location: Kimberley, B.C.
Posts: 182
Thanks: 6
Thanked 5 Times in 4 Posts
iTrader Score: 0 reviews
Vibrations in lockup

I know my truck feels the road vibration alot but when i'm on the go pedal and OD hits and then when LU hits I feel even more. Its not a steady shake but more of a increase in feeling the damn road vibration. Hard to explain but could the drop in RPM let me feel more of it or can there be a issue with my driveline? Seems to be mainly when im hard on the pedal


1994 SLT Laramie RCLB Auto 4X4 SOLD!
2015 2500 SLT CCLB 5.7 Hemi 4x4
TYONEON is offline  
Sponsored Links
Advertisement
 
post #2 of 9 (permalink) Old 03-22-2012, 02:15 AM
Diesel Freak
 
whitlers's Avatar
 
Join Date: Oct 2011
Location: Canada
Posts: 559
Thanks: 12
Thanked 45 Times in 42 Posts
iTrader Score: 0 reviews
Just throwin in out there. D shaft center bearing or worn u joints

96' 2500, AFC mods, 3 GSK, 60 lb springs, BD 3pc manifold, PS 62/65/12, DAP 5x.012's, A1 studs, Tork -Tek OFV, BHAF, 4" exhuast, 475 hp Southbend
whitlers is offline  
post #3 of 9 (permalink) Old 03-22-2012, 09:07 PM
Diesel Head
 
Join Date: Mar 2008
Location: Rockford, Illinois
Posts: 1,878
Thanks: 37
Thanked 39 Times in 36 Posts
iTrader Score: 0 reviews
I have the same issue during lock up or at 40mph I get a wicked vibration. Im planning on replacing all U-joints in the near future as Im sure they are all original or close to it. Let me know what ya figure out.

Daily Driver: 2004 Ram 2500 Quad Cab 4x4 Long Bed Automatic 5.9l CTD 23k miles and counting, 4" MBRP Turbo Back exhaust 1995 ram 2500 4x4 auto trans
abe568 is offline  
Sponsored Links
Advertisement
 
post #4 of 9 (permalink) Old 03-22-2012, 10:10 PM
Diesel Head
 
liteweight's Avatar
 
Join Date: Oct 2009
Location: Winterpeg, Manitoba,Canada
Posts: 1,675
Thanks: 105
Thanked 195 Times in 173 Posts
iTrader Score: 3 reviews
Are you sure it's not converter lock up clutch shutter??? This is a very common problem especially when your on the go pedal. Simple check is to manually disconnect the LU converter at the speed you think it's doing it. If the vibration goes away, you have converter shutter. NOT Good & don't continue letting it do it

liteweight

96 4X4 2500,KDP,16.5*,40hp injectors,boost elbow,3K,ground plate to 0,AFC mods,5" exh.BD pressure loc kit,lock up switch,low stall,Rebuilt trans.all billet Boost,Pyro & Trans. gauges,rear air bags,3.54's, 315/70/16's
liteweight is offline  
post #5 of 9 (permalink) Old 03-23-2012, 02:09 AM
Newbie
 
deadstilll's Avatar
 
Join Date: Apr 2010
Location: Orange County
Posts: 32
Thanks: 10
Thanked 0 Times in 0 Posts
iTrader Score: 0 reviews
It's the converter doods, too much power for the weak trans.... Especially at low rpm there's little line pressure when the motor makes the most torque.
Get a billet converter and a valve body. Goerend is awesome.

94 12v 4x4 190k SCLB, 100 plate, 4000 gsk, 4" no cat back, bhaf, 16* timing, goerend trans/ triple disc, kdp tabbed , 33" tires, gauges
deadstilll is offline  
post #6 of 9 (permalink) Old 03-23-2012, 02:24 AM Thread Starter
Cummins Fanatic
 
TYONEON's Avatar
 
Join Date: Dec 2010
Location: Kimberley, B.C.
Posts: 182
Thanks: 6
Thanked 5 Times in 4 Posts
iTrader Score: 0 reviews
I have felt clutch shutter in my old rig, this isn't it. Its not driveline vibration, I have been thru the entire truck and cured everything I can.
I just put over 1000lbs in the box and the shake is still the same, the truck rides realy nice now though. Its like because the RPM drop in LU allows me to feel the road vibration more than when under load off the line.
Maybe I just worry to much and should just deal with the fact these trucks drive like tractors?

1994 SLT Laramie RCLB Auto 4X4 SOLD!
2015 2500 SLT CCLB 5.7 Hemi 4x4
TYONEON is offline  
post #7 of 9 (permalink) Old 03-23-2012, 03:10 AM
Newbie
 
deadstilll's Avatar
 
Join Date: Apr 2010
Location: Orange County
Posts: 32
Thanks: 10
Thanked 0 Times in 0 Posts
iTrader Score: 0 reviews
If it only happens in lock up in od.Anything more than an ez ,very ez, acceleration will make a stock converter shake. It just does, sorry but it's an expensive upgrade and even I didn't want to do it. I'm happy I did.
Belive what you want, this is a common issue.
Btw the more weight you put in it will increase the problem as the converter is flexing then slipping before power is transmitted to the wheels. A lighter weight truck won't run in to this issue as frequent.
Check your tps sensor, if it's out of spec it will pot the trans in od too early before there is enough line pressure. Tv cable adjustment could also affect these things but I suspect the tps if your truck goes to od before 45.
Search for the tps stuff it's all here.
The trans pump is making more line pressure at 45 but still not enough rpm for heavy acceleration to wot. Line pressure holds the converter tight... Not until 1600 or 1700 is there enough line pressure for wot.
The stock trans SUCKS even for a stock truck, even if it's new or rebuilt. It needs the beef! Your truck will thank you. I love feeling the torque down low instead of shaky truck...
At least consider a valve body and single billit torque converter and definitely check the tps, all you need is a multi meter and paper clip. Replacement tps is about 250 last time I checked.
Don't let this happen or you will be forced to correct the problem sooner than later. If you ruin your converter ,clutch friction material will get all up in the trans and soon the trans will need a rebuild. Not to mention if your truck fails to lock up the cooling circut will not engage and heat will continue to destroy the trans until it quits. We don't have trans temp on our trucks but even stock stock transmissions run the upper limit of acceptable operating temps.
Doood, I didn't see that you have a 3gsk and 10 plate, but the 3gsk changes the pedal/ fueling profile. Notice how you have to use less pedal for a response fron the truck? This correlates to the tps as well as line pressure relative to the amount of power the engine is making at a given rpm.
I had my 4gsk , fuel plate, and timing tools sitting in a box until I fixed up the tranny.....
I couldn't believe I paid more for the trans than i did for the whole truck! And I still plan on billet shafts later on,even then I'll sell the 47rh and do an Allison 1000 6speed. ( when I find a spare 10gs)

This gets pretty dam ridiculous. quick .

Why can't we just be happy with a 160 hp cool sounding truck....

94 12v 4x4 190k SCLB, 100 plate, 4000 gsk, 4" no cat back, bhaf, 16* timing, goerend trans/ triple disc, kdp tabbed , 33" tires, gauges
deadstilll is offline  
post #8 of 9 (permalink) Old 03-23-2012, 09:53 AM
Diesel Head
 
liteweight's Avatar
 
Join Date: Oct 2009
Location: Winterpeg, Manitoba,Canada
Posts: 1,675
Thanks: 105
Thanked 195 Times in 173 Posts
iTrader Score: 3 reviews
I bought one of these when I first purchased my truck. It is a GREAT investment for converter shutter. Any time there is a call for the converter to be locked, wheather through the TPS or you manually lock it through a bypassed switch, this will pull the trans pressure to max pressure, even at part throttle.
Now, as far as your vibration, if your 100% sure it's NOT converter shutter due to previous experience, then you may have a couple bad engine mounts.


BD Power - Product: PressureLoc

liteweight

96 4X4 2500,KDP,16.5*,40hp injectors,boost elbow,3K,ground plate to 0,AFC mods,5" exh.BD pressure loc kit,lock up switch,low stall,Rebuilt trans.all billet Boost,Pyro & Trans. gauges,rear air bags,3.54's, 315/70/16's

Last edited by liteweight; 03-23-2012 at 10:12 AM.
liteweight is offline  
post #9 of 9 (permalink) Old 03-23-2012, 11:30 AM
Newbie
 
deadstilll's Avatar
 
Join Date: Apr 2010
Location: Orange County
Posts: 32
Thanks: 10
Thanked 0 Times in 0 Posts
iTrader Score: 0 reviews
Those help to correct for throttle position .BUT you can't magically make the pump in the trans spin faster than it does at any given engine rpm ( other than unlocking the converter)

Pump speed/ engine rpm increases available line pressure, the vb just puts that pressure to work

That lil doodad just helps use what line pressure has built up there at a given rpm, and is like a band aid that will eventually fall off if you keep adding power.
But it's cheaper than a new trans...

If you let your truck shake , start saving money for tranny work or new walking shoes

94 12v 4x4 190k SCLB, 100 plate, 4000 gsk, 4" no cat back, bhaf, 16* timing, goerend trans/ triple disc, kdp tabbed , 33" tires, gauges
deadstilll is offline  
Sponsored Links
Advertisement
 
Closed Thread

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Dodge Cummins Diesel Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in










Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome