Shudder when going into 1st gear on 93 K1500 - Pirate4x4.Com : 4x4 and Off-Road Forum
 
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Old 06-29-2009, 09:29 PM   #1 (permalink)
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Shudder when going into 1st gear on 93 K1500

I recently picked up a 1993 Cheyenne with the TBI 305 motor, 5 speed manual trans, 4x4, and a 14 bolt rear end... It has a 3 inch body lift as well as 2 inch blocks under the rear leaf springs....the front suspension has been lifted as well.

When I'm going into first gear, I get a really bad shudder like I'm not working the clutch right....I don't believe thats the case though since the majority of vehicles I've driven have been manual.... I can hear loud noises comming from under the truck....almost like a poping noise. If it jerks hard enough, my transfer case will jump into neutral.....so I have to come to a stop and throw it back down into 2wd.

My 4 low and 4 high work, so I don't think its a problem with the transfer case....When I say if it jerks hard enough.....it literally throws me around in the truck. If I granny the clutch and take off slower then an 18 wheeler, I get a light shudder....My ECU isn't throwing any codes or anything like that....and once I'm moving and fully into 1st gear, I don't have any issues. In reverse, I get the same thing but it isn't nearly as bad.

What could cause this? I'm sure someone has come across this before....this is the first big truck that I've owned so I'm kinda new to the whole thing.... Please any help or advise would be great. Thanks

Here are a few pics







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Old 06-29-2009, 10:42 PM   #2 (permalink)
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clutch is smoked, if its a new clutch , the disc is in backwards or the flywheel has been machined to much to be usable.
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Old 06-29-2009, 10:43 PM   #3 (permalink)
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bleh got beat to it edited..

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Old 06-29-2009, 11:11 PM   #4 (permalink)
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Thanks for the replies...

The guy I bought it from did tell me that it recently had a new clutch put in. The clutch its self feels good too....

How would I go about checking the flywheel to see if the machining on it is bad? Is it the same concept as checking rotors?

Would I be better off buying a new flywheel (I'm finding them for about $75 brand new) or getting mine machined? What kind of places would machine it?
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Old 06-29-2009, 11:25 PM   #5 (permalink)
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i couldnt tell you where to find the accept able thickness but right off the bat you will see that the heads of the flywheel bolts will be beat up, the torsion springs for the disc will be beat up and shiny, and if its been going on for a while the surface will be shitty looking.

my whole point in the first post was that the flaywheel has been machined to the point where its overall thickness is to thin.

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Old 06-29-2009, 11:33 PM   #6 (permalink)
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OK I understand what you're saying. I'll break it down and see how things are looking. Sounds like I have my work cut out for me tomorrow.

As far as the transfer case jumping into neutral when it jerks too hard starting off in first, is that a normal symptom of the flywheel or is that going to be a different problem?
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Old 06-29-2009, 11:48 PM   #7 (permalink)
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if its doing what i think it may have passed damage down the line and beat the tcase guts up to the point that its jumping out from the shocking and shuttering, it may clear up when you figure out exactly whats going on, it maybe too late.

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Old 06-29-2009, 11:50 PM   #8 (permalink)
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Alright. I'll take a look at things here in the next few days and give a status update on it. Hopefully I can have the problem cleared up without too much time and money haha
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Old 06-30-2009, 03:22 AM   #9 (permalink)
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You probably have a broken motor or trans mount. The movement of the drivetrain causes the linkage to pull the t-case out of gear since the shifter is attached to the body.
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Old 06-30-2009, 07:46 AM   #10 (permalink)
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Make sure that the rear leaf spring u-bolts are tight.
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Old 06-30-2009, 10:25 AM   #11 (permalink)
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Quote:
Originally Posted by KWTMECH View Post
Make sure that the rear leaf spring u-bolts are tight.
They are actually brand new. I just put new blocks on the back. That is the first thing that I thought of so I bought new blocks and hardware. Turned out one of the old blocks was cracked so it needed to be replaced anyways.

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Old 06-30-2009, 12:24 PM   #12 (permalink)
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Also check engine and transmission mounts.

My truck used to do the same, except it was both 1st or 2nd gear from standstill.

And depending on how much the clutch was feathered or gas applied while taking off, sometimes it would shake the whole truck like it was possessed.

I found that the tranmission mounts were shot, as well as one mounting bolt broken, the other loose.

Engine mounts were destroyed.

Basically, the whole powerplant was just flopping around in there.
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Old 06-30-2009, 12:35 PM   #13 (permalink)
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WOO! those are my pics!

Let me know when you want to break it down and ill give you a hand dropping the transmission. Summit Racing sells flywheels for $72 for your 305. We can always drop by a junkyard and get a cheap one and get it machined. It would cost you a lot less then buying a new one.

The idea for checking the mounts is an excellent idea. Even my brothers '96 had trashed mounts when we got to it, and when we got them changed out, there was a noticeable difference in the smoothness of the shifts, but that would have also been the clutch, pressure plate, and master cylinder that we just dropped in.

EDIT: I told you if you post in here you would get a pretty damn quick answer!! FTW
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Old 06-30-2009, 06:21 PM   #14 (permalink)
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Haha hey Matt. Today was much better then the other day wasn't it? I have to fix todays damage before anything though....

It seems like some water got into the motor....maybe a little too deep for the truck....We got pics and video of it that will be posted ASAP.

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Originally Posted by metalmatt47 View Post
WOO! those are my pics!

Let me know when you want to break it down and ill give you a hand dropping the transmission. Summit Racing sells flywheels for $72 for your 305. We can always drop by a junkyard and get a cheap one and get it machined. It would cost you a lot less then buying a new one.

The idea for checking the mounts is an excellent idea. Even my brothers '96 had trashed mounts when we got to it, and when we got them changed out, there was a noticeable difference in the smoothness of the shifts, but that would have also been the clutch, pressure plate, and master cylinder that we just dropped in.

EDIT: I told you if you post in here you would get a pretty damn quick answer!! FTW
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Old 07-01-2009, 11:15 AM   #15 (permalink)
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I checked out both the motor and trans mounts and they checked out OK....so I guess the next thing in line is the flywheel

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Old 07-01-2009, 06:56 PM   #16 (permalink)
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Something else that causes the chatter on engagement on mine:

The bearing retainer that the throwout bearing rides on is worn out of round along the length. So it makes for an uneven transistion when the clutch is engaging.

Check it out.
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Old 07-01-2009, 07:29 PM   #17 (permalink)
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i also forgot to mention to check the bellhousing to block bolts.
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