hey guys is it okay to shift from 3rd to 6th? or is it normal for it to grind if you do this? i usually merge onto a highway in 3rd and then drop it into 6th at cruising speed.

edit my car is an 08 with 55000km ~34kmiles

 

yeah dude, its normal.
depending on your year, try searching for "throwout bearing"

the grind usually happens when u shift from 4th to 5th, but ur issue may be related, and it also happens with the clutch fully pressed.

GL op!

 

Shifting from 3rd to 6th should not grind; no shift should grind. I've gone from 2nd to 6th, and 6th to 2nd, same with 3rd, 4th, and 5th. If it grinds have it checked out.

 

thats my opinion too, im gonna go try get a new tranny under warranty, i can replicate the problem every time

 

You will get a NEW trans, clutch, and flywheel all for the cost of rental car insurance(if you decide to go with it/need a rental)

I have an 08 also and at ~21k miles it would do the same thing. Nissan will pay for it all...

 

booked in for a test drive for 2morrow with shop forman at nissan here... once and if i get a new one should i change my shifting habbits? i mean is it wrong to shift like that i get mixed responces from people i talk too. i personnaly have always driven like this and this has been the first car that has issues with it lol, i guess it has more power then the others though too

 

I skip gears more often than not. Done this for years and haven't noticed any issues.

 

My friend just had his replaced for 5th gear grind input shaft bearing was bad something with the cd009 for the hr causes them to wear quickly mines bad but I'm turboed so I'm out of luck

 

The only extra wear it *may* cause on the transmission is synchro wear and that's only if you're trying to jump rpms a ton. Other than that, there's no difference.

 

thanks for the input guys, gonna get it looked at 2morrow

 

Skipping gears like that is fine but you should double clutch to prevent extra wear on your syncros.

 

Ive heard quite the opposite.

Especially downshifting.

EDIT:: appears you posted on this tho too, my bad.. i agree, synchros issues

Youre asking far too much of your synchros to move from a taller gear to a far shorter gear and do your rev matching for you, you will grind for sure going from 6th to 3rd.

The grind you are experiencing OP is likely due to the same issue, change in synchro from short to very tall at the same trans speed..

if it doesnt happen in the normal shift pattern when you go 1-2-3-4-5-6 i doubt you have a physical issue or damage.

If you cant go from 1-2 with out grinding, or from 6-5 w out grinding, its fairly common.

Things to research, has your trans ever been removed for clutch work etc? If so, many techs have no idea theres a shifter adjsutment procedure that has to be done at the 3 bolt shifter plate upon reinstalation of the parts.. or you can grind every gear.

Your clutch may be dragging due to air in your line, wear of the clutch, or misadjustment of the pedal.

You could ahve a bent shift fork..

but again, lots to searchand read for yourself here now.

If the car shifts fine 1-2-3-4-5-6, its not broke.

 

You've just shifted out of 3rd, so the input shaft is still spinning at high RPMs. The synchronizer needs to slow the shaft, attached gears, and clutch disc down to match the speed of 6th gear. That's a much bigger job than they'd have when shifting out of 5th to 6th at the same speed.

I expect the Nissan guy is going to tell you the transmission isn't designed for skipping that many gears without using a slightly different shifting technique, which you obviously haven't mastered yet. Once they think you've been abusing the transmission with your poor driving technique, your chances of getting a new transmission for free are close to zero.

 

look how smart we all are haha.

 

You can shift into any gear from any other gear, although the problem starts when you try to do it too soon. The others are right here. The synchros will try to slow or speed up the shaft to match whatever gear your going into. What I do if I know I'm going to jump gears like that is I match the revs before putting the shifter into the gear I want to be in. Ex: going from 3rd to 6th, when coming out of 3rd I will wait a sec or two until my rpms drop then put it into 6th so that my tach doesn't jump up or down when I let go of the clutch. If the tach jumps up or down then you are working your synchros harder than they need to.

 

Thanks for the post and the feedback. I experienced this once or twice (3rd to 6th grind). I just stopped doing it.. otherwise, trans is fine.

 

IMHO, that's way to many gears to skip for one shift. Think of it this way, say you are biking and you shift from 1st gear to 4th gear, isn't that hard to do? Sure you can do it, but you'll be lugging the engine anyway just like you will be lugging yourself when you go biking.

 

If he's winding it out to 5000 in 3rd (1.624:1) while accelerating on the freeway, he'll be running about 2500 when he shifts into 6th (.794:1) for cruising. That's not gonna be lugging the engine.

 

hey guys i took it in, and was able to get it to grind 3-6, 4-6, and slightly from 5-6. they called me monday and they said they would pull my tranny to take it apart and determine if its a warranty issue ??? as far as i know my tranny has warranty so why the hell wouldnt it be warranty. they want me to authorize a 650$ bill for the diagnostic work that will be charged to me if its not warranty ?!?!? also should they be rebuidlign my tranny if there is a fault or replacing it with new one? i dont want tranny rebuild butchers hammering on gears scuffing shafts etc, id want a new tranny know what i mean? what are my rights here?

 

It's not lugging the engine, but as others have stated, that's a huge rpm jump to ask of the synchros.

We typically hear of issues most commonly in 2nd and 3rd gears, because those are the two jumps (from 1 to 2, and from 2 to 3) where the gears are spaced farthest apart. This is also the reason many manual trans will have "beefier" synchros in the first few gears (e.g. triple-coned carbon vs dual brass for the later gears) -- they take more abuse.

Jumping from 3rd to 6th is the same kind of a jump -- sure, the synchros can speed down the input shaft, but guess what -- synchros are a wear item! You're just wearing them down faster.

Again, as others have stated, if you want to skip gears on an UPSHIFT....wait a second or two for the rpms to drop off, which they will naturally do when you clutch in.

If you want to skip gears on a DOWNSHIFT...you should rev-match, and preferably double-clutch rev-match if you want to preserve wear on your synchros. Example -- if you downshift from 3 to 2, you feel some resistance, right? That's the synchros doing their job. Now what if you downshift from 6 to 2 -- extreme example, but you feel a LOT more resistance, don't you? That's b/c you're asking your synchros to "sync" a MASSIVE rpm difference -- the spread of multiple gear ratios. Not good!

The fact that it grinds going from 4 to 6 or 5 to 6 doesn't make a difference *if 6th gear synchro is already damaged*, which may have been caused from the skip-shifts -- it's very hard to tell without observing your shifting habits.

The fact that it grinds less on the smaller jumps is also hard to diagnose, b/c the rpms may be dropping off enough that the synchros aren't really being used much. E.g., the rpm drop from 5 to 6 is small enough that just clutching in & out may cause it to drop to where it *should be* in 6th, meaning the synchros didn't even get used much, if at all.