Funny noise in 4th and 5th Gear

[reblawyer]

I'm getting a vibration about halfway through 4th gear (RPM wise) and the same n 5th gear. The vibration and noise seems to correspond with a feeling like the clutch is yet not fully engaged. Any thoughts?

 

[rdixiemiller]

How hiogh is your clutch pedal? You may have an adjustment issue, in which case it needs fixing ASAP. You may have a clutch going out, or a bad universal joint. A bad u-joint can give you that vibration that starts at a certain speed, then gets worse as you go faster. Probably be after the transfer case, or it would do it in any gear once you hit a certain RPM.

 

[reblawyer]

Doesn't feel like a u-joint, plus it gets better once the truck gets up to the middle to top end of the speed in whatever gear it is in. Clutch seems to engage adequately for shifting at about 2/3 depression but the pedal is run all the way up.

 

[poppop]

If the petal has no free play then the release bearing is running all the time. The bearing could be vibrating at certain RPMs but i don't know why it does'nt do it in every gear. If the bearing is running all the time it won't ;ast long.

 

[bottleworks]

Here is the PS mag on the clutch. The bearing is an intermittent use bearing. It will fail if it is allowed to constantly turn with the engine. If it's out of adjustment, it needs to be fixed ASAP.

 

[reblawyer]

Thanks guys, got my weekend project laid out for me now.

 

[m35a2cowner]

clutch

If you think the clutch is slipping in 4th or 5th when you feel the vibration, floor it. If the clutch is slipping the engine speed will increase much faster than the trucks speed. Does it vibrate when the truck is moving at the speed you experience the vibration with the motor idling? If so it might be a tire or drive shaft out of phase (eyes of the u-joints not lined up) or a bad u-joint of carrier bearing (if so equipped). I agree that you should check the clutch adjustment. Also check to see if the clutch linkage is not binding (has it been greased?) Make sure the transmission is tight to the bell housing and the bell housing is tight to the motor. Also check all engine mounts as well as the the mounts on the transfer case. Good luck

 

[reblawyer]

RE: clutch

Checked out the clutch adjustment and it has adequate free play. The engine rpm does increase much faster than the actual truck speed. Can anyone tell me how to visually id the lube point for the clutch linkage?

 

[rdixiemiller]

RE: clutch

Is the clutch slipping? the pedal height may be good because the clutch pedal has been adjusted. If the disk is too thin, the clutch will slip under load. This is usually noticed when climbing a hill in 4th or 5th gear. The engine will start running faster and faster, while the truck slows down. You can usually smell the clutch frying when that happens.

 

[reblawyer]

RE: clutch

Well, its not losing speed on hills, at least not because of slippage. Think I'm going to have to take it out for a run and see what other symptoms I can find.

 

[DomUnique]

RE: clutch

I know this is a bit old but have you found the problem?

 

[jwaller]

RE: clutch

pull the bell housing cover on the bottom and check the free play and lube the release bearing.

 

[bottleworks]

Re: RE: clutch

pull the bell housing cover on the bottom and check the free play and lube the release bearing.

I had no idea that the throwout bearing could be greased. Just a zerk fitting? I will have to do that tonight!

 

[clinto]

RE: Re: RE: clutch

Just a zerk fitting?

yupp

 

[bradmachine]

might be rusty bearings in the 4/5 gear countershaft. might eventually lead to excess spline wear causing it to jump out of 4th or 5th gear... might check to see if there is water in oil in the trans....oil might look like a milk shake after it has been driven...water settles out and rusts the bearings in the lower countershaft....which is 4th and 5th......if the truck has set outside without a top on the cab then there is a chance of water in the tranny....rain runs down the gearshift lever and if the boot isn't absolutely water tight, a little gets by and drips into the trans....settles to the bottom, eventually gets up to that bottom shaft which is 4/5 gear....I learned all this the hard way...

 

[Recovry4x4]

Speaking of the 5th gear countershaft, I've got a tranny with a chunk out of the 5th countergear. Anyone have one?

 

[m-35tom]

trans

actually, the counter gear is for every speed except 4th (on overdrive trans) 4th is straight through and puts no load on anything in trans except bearings. kenng i have a good counter gear.........

 

[bradmachine]

OK,,,, 5th is overdrive on mine, is there any fix for jumping out of gear ,4th and 5th. mainly 5th on a long pull....???.....

 

[bradmachine]

OK,,,, 5th is overdrive on mine, is there any fix for jumping out of gear ,4th and 5th. mainly 5th on a long pull....???.....

 

[m-35tom]

uh, rebuild trans before it gets worse and breaks