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ctmandu
PostPosted: Mon Jul 02, 2007 9:06 pm 
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my truck has stared to vibrate only in 4th gear @2000/2400 RPMS and i only feel it in the gas pedal... has never don this before so any ideas i cant seam to find anything loos or wrong

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Last edited by ctmandu on Sun Jul 08, 2007 11:44 am, edited 1 time in total.

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Dustinicus
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PostPosted: Mon Jul 02, 2007 9:21 pm 
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i think it is something you may have over looked, im posative it has to be something in the bushings or oin the pedal, try removing it and replacing any bolts or parts that may be worn... thats all i can think of... its just REALLY odd....

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Dustinicus
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PostPosted: Mon Jul 02, 2007 9:26 pm 
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it may be a bad bearing in the gear just throwing out ideas man, if i think of more ill throw them out too....

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erronisme
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PostPosted: Mon Jul 02, 2007 11:19 pm 
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U-joints are pretty easy to check, Id start there.

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ctmandu
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PostPosted: Mon Jul 02, 2007 11:21 pm 
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ok , thanks guys

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tumwatertaz
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PostPosted: Tue Jul 03, 2007 12:20 am 
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Yeah...if it ain't the u-joints, then it could be a bad bearing in the tranny. Most likely it's a u-joint though...most stock Luv tranny bearings are pretty tough.

Usually it's a synchro that will start acting up first - mostly second gear because it gets the most wear-n-tear from daily driving.

(Especially if you drive like I do... :D )
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ctmandu
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PostPosted: Tue Jul 03, 2007 10:18 pm 
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well its not the u-joints

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Luvrv8
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PostPosted: Tue Jul 03, 2007 10:32 pm 
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How is the trans mount? How about the rear trans output shaft bushing? If you can grab the drive line and shake it up and down in the trans the bushing/bearing could be bad.

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ctmandu
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PostPosted: Tue Jul 03, 2007 10:37 pm 
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mount is good ...i check water pump alternator intake exhaust anything that could be loose... i guess i need to build the G200 with G180 head and throw in the 5 spd i have, just wasn't ready to do it yet... even checked the wheels and suspension... i am lost now idea...

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Last edited by ctmandu on Wed Jul 04, 2007 1:00 am, edited 1 time in total.

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Luvrv8
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PostPosted: Tue Jul 03, 2007 10:44 pm 
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If I had to place a bet on this I would go with a drive shaft out of balance.

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rondog
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PostPosted: Tue Jul 03, 2007 11:56 pm 
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Who cares if it shakes. As long as it's clean, you look good getting there. :lol:

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ctmandu
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PostPosted: Wed Jul 04, 2007 12:59 am 
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Luvrv8 wrote:
If I had to place a bet on this I would go with a drive shaft out of balance.

now that could be a possibility, didnt think of that one

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erronisme
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PostPosted: Wed Jul 04, 2007 11:52 am 
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maybe the input on the rear end too...but I would think that you would have noticed the input and output on the trans and rear diff

If its only vibrating at a certian speed I think Luvrv8 might be right. As long as its related to your mph and not your engine rpms or what gear your in.

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ctmandu
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PostPosted: Wed Jul 04, 2007 1:26 pm 
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well i tried all the gears and found it will do it at 4k rpm in 3rd gear and 2-2500k in fourth only and all the rest is good up to about 6500rpm... i have to have the drive shaft checked but anymore ideas keep them a coming... and thinks to all for the help sofar

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mikew
 Post subject: tranny
PostPosted: Wed Jul 04, 2007 6:25 pm 
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I've never seen this in a standard trany but I've seen it in a automatic trany. It would shimmy and vibrate when goin up a hill or and time the trany had a load on it.Caused from pullin trailers without turnin the overdrive off. Have you pulled anything with your truck in 4th that would lug the tranny. I would think that if you did it would hurt your clutch before the tranny but I don't no that.
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ctmandu
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PostPosted: Wed Jul 04, 2007 7:28 pm 
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clutch is great and i have never pulled anything with the truck but have no clue before me

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800xl
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PostPosted: Thu Jul 05, 2007 7:33 pm 
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Could it be pinion angle? If the u-joints are slightly out of phase it will cause a light shimmy that might only show up at certain driveline RPMs. Do those gear/engine rpm spot it happens correspond to the same MPH? If you are lowered a bit in the rear it could be that the pinion angle changed just enough to cause a bit of wobble.

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rizewitdafallen7
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PostPosted: Thu Jul 05, 2007 8:01 pm 
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my truck does the same if im doing over 65 and it gets realy loud so i think it just gets scared of the road and shakes haha dont worry if its shaking after 65 it seems like they all do a little vib but if ur vibration is kicking in b4 65 then u might wanna check the u-joints
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ctmandu
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PostPosted: Thu Jul 05, 2007 9:18 pm 
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800XL not any lower then it has been for the last 3 years, i think it might be my suspension it seams to be getting sloppy ( more play then normal) but again cant see anything that would cause it...

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Luvrv8
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PostPosted: Thu Jul 05, 2007 9:38 pm 
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Alittle off topic but it is very important to put in wedge shims on the rear end if it is lowered. It will keep the pinion angle correct.

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