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6sp shift question

3K views 15 replies 6 participants last post by  rrich 
#1 ·
I posted this question at the bottom of another thread that was running and guess it got lost from views for an answer, so I did a copy/paste of that question to a new thread. Hope someone can tell me......

"Not meaning to hijack the thread here, but brings up a question my 6sp does when shifting. It's only in 2nd gear when shifting from 1st to 2nd. As you move to 2nd while the clutch is pressed in, I can feel a bump, sort of like something wants to go in the opposite direction to knock it out of going into 2nd gear. No grinding of gears, no hard pulls to get it into 2nd, just a bump you can feel that again, feels like it wants to kick the stick back out from going into 2nd. I know this is hard to understand, it's hard to explain too.... Any ideas ?"
 
#2 ·
I hear its the syncro, I have an 05 and it does the same too if I shift too fast. I hear that syncromesh or Royal Purple will solve it, but since youre covered under the powertrain 7/700k warranty we should be able to take it back into the dealership and have them change out the oil or fix it/replace it.

Ill let you know what happens when I take it in in Hawaii, but thatll be in over a month.
 
#6 ·
Royal Purple, Slick 50, all those gimmick things will just make it worse. They make everything nice and slippery as advertised, but synchros don't want that. Synchros are a friction device - kill all the friction they don't work. It's a balance between being slippery enough to prevent wear, but not so slippery the synchros don't work. Use the right stuff the dealer sells. Specify the year, it does make a difference.

The "bump" you are feeling is the synchro hub pushing back because the gear isn't up to speed. The dogs in the synchro hub hit the gear dogs at the wrong speed and kick back. The brass ring and cone are slipping too much to speed things up fast enough.
It's usually most pronounced at the 1-2 shift. Often just getting it first after a stop is hard too. Force it you'll break something.

Shift it slowly for now to avoid internal damage. When you shift you can feel a resistance as the cones speed things up - let it hang there a slight moment, then you'll feel it "suck it in."

Change the trans oil ASAP - if you buy the proper trans oil from the dealer keep the receipt so you can prove you used the right stuff and keep the warranty in place. What the dealer sells for the trans is NOT the same as what Wal-Mart or Abdul's discounted parts has. Don't fall for advertising lies.

But - if you have to take it back under warranty - don't even tell them you changed the trans oil. What they don't know won't hurt them, or you.

If using the right oil in it doesn't help then it needs internal fixing. The biggest expense then is the labor.
 
#10 ·
I'm the 2nd owner of mine. Took it to the dealership in town yesterday and told them what was wrong. They said in '05, depending on the build time, some had 3/36 powertrain, others had the 7/70 coverage. They looked the VIN up and as luck would have it, I have the 3/36, so that's gone.

What's a ballpark figure a feller would look at to have it done at a mechanics shop, or would it need to be done at a transmission shop ?
 
#12 ·
I've got the same problem and changed my fluid with royal purple. I have the 7/70,000k warrenty, so should I change it again with mopar fluid? By the way, I don't think the royal purple helped. If anything, it made it worse.
 
#16 ·
A few might suggest using the correct fluid - most will want to sell you a trans rebuild.

Change it yourself, or at least take the fluid to the shop and tell them to use it - nothing else, no additives. Then give it a try.

Fluid change with YOUR fluid - $35-50.
Trans rebuild - $500 to 1500.

Only take it to a place that's familiar with late model Jeeps transmissions and transfer cases. They are easy to screw up if they aren't experienced with them.

But try it first, nothing to lose. I've "fixed" many manual tran's with just using the correct fluid.

If they rebuild it, make sure they use the correct fluid.
 
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