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Unread 06-24-2012, 04:10 PM   #1
jamesc59
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1959 CJ5 
 
Join Date: May 2012
Location: Fresno,CA
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question about driving in third gear.

been having a problem when in third gear, after i shift into third gear about maybe a minute in my cj-5 will just start shaking violently, scares the crap out of me everytime, im fairly new to driving stick, so im not to sure if im just not going the correct speed when shifting or ive heard that may be u-joints? anybody have any ideas what may be the cause or anybody with any experience with this?


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Unread 06-24-2012, 04:43 PM   #2
86cj74.2L
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What mph and rpm are you at when it does this?
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Unread 06-24-2012, 04:45 PM   #3
hopefulcj76
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Does this only happen in 3rd gear? Do you feel any vibrations in first when you are just getting the jeep move?
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Unread 06-24-2012, 04:51 PM   #4
NExOBLIVISCARIS
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only time my cj5 starts shaking violently is when i put it in reverse and it only shakes until the clutch is fully engaged. are you shifting when the engine starts to lug?
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Unread 06-24-2012, 05:03 PM   #5
hopefulcj76
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Mine shifted violently in first gear on the beach when the engine started to lug, it was bad, I thought that the drivetrain was going to explode at times. I replaced the engine mounts with the daystars and changed out the t-case/tranny as well. All is fixed. It's a pain, but it's worth it.
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Unread 06-24-2012, 05:11 PM   #6
86cj74.2L
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Are you lugging it? As in trying to drive in 3rd gear. Just off idle
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Unread 06-24-2012, 09:37 PM   #7
titomars
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3rd gear is also right about death wobble speed. Are you sure it's trans related and not just speed related? If this happens only at a certain speed whether you are in 3rd, 4th or neutral you probably have death wobble. Which is a worn out front suspension system. It's not u-joints. They would have to be so bad you would hear the creeking and popping when ever the Jeep moves.
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Unread 06-24-2012, 09:50 PM   #8
BagusJeep
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You could be at too low an engine speed or accelerating too agressively at a low engine speed. The vibration this sets up will be amplified by all the above sources.

You need to check the gearbox and engine mounts for play, the U joints for play and the suspension at both ends as well as wheel bearings.
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Unread 06-24-2012, 10:28 PM   #9
phritz
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Your profile says you have a 1959 CJ-5 with a 4 cylinder and 3 speed t 90 transmission pushing 33" tires. So....there are lots of things that could be wrong. The steering system on older Jeeps has lots of extra moving parts compared to the more "modern" 1972 and up Jeeps. If you don't know where the bellcrank on your Jeep is (and yes you have one ), it's time for you to find a picture of you Jeep's steering system. The bellcrank itself has three wear areas. The link between the base of the steering column and the bellcrank has two wear points. Then you have the drag link and the tie rod, with all of their associated ends. Your front axle is either a Dana 25 or Dana 27, which have knuckle bearings instead of ball joints. All of these are places to look for wear and play. Poorly balanced tires could also be your problem.

A good start would be to have someone sit in the Jeep without the engine running and slowly rock the steering wheel back and forth while you look at all of the steering system looking for play or looseness in any of the joints.

My first Jeep was a 1953 M38A1, your Jeep's military Dad. Bought it in 1974 as a "project". It had the same steering set up. It was a frame up, so I replaced everything.

Good Luck !!
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Unread 06-24-2012, 10:33 PM   #10
Skerr
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Next time it starts to do that, downshift to second. Offhand, it sounds like you're driving at too slow speed in third gear. The engine is trying to stall. OR- it's one of the other things posted above!
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Unread 07-03-2012, 02:28 AM   #11
jamesc59
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yeah im pretty sure it was just that i was driving at too low of a speed and i dont have a tachometer on it so im still getting used to having to listen to the engine! coming from a 2wd dodge ram its a big step up im glad to finally be part of the jeep community!
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