jasonberkeley

I am having a problem when up-shifting from 5th gear to 6th gear during hard acceleration. There is a slight grinding / rubbing noise as I go into 6th gear.

Car has 43,000 mostly highway miles, and a Ripper Shifter. Never had problems before. Car has seen a weekend up at Road America, but you can't get up to 6th gear there (barely touch 5th). All fluids (including gearbox) were changed before and after the weekend, as well as the clutch slave cylinder.

On my 104 mile daily round trip to work, car is 6th gear 90% of the time.

Anybody have an ideas? :confused: I was thinking maybe the synchros were going on 6th gear? Car shifts perfectly at all other times.

Thanks for any help,

Jason

SDVette

Don't you need to be going, like 180 MPH to wind out 5th gear? What RPM are you shifting into 6th?

gpflepsen

Jason, you better not be broke come September 29-30!

I think the linkage can be adjusted on the shifter. This might not be the problem though. Why was the slave replaced? If it is because it wasn't releasing the clutch all the way? If that is the case the syncros will take a beating. I think the MN6 only has one syncro on 6th gear.

Also, the shifting forks are made of some plastic stuff and can wear out/break/bend.

wwashing

One would think that "hard shifting" into 6th gear would be a fruitless activity? I'd think you need to be going unbelievably fast to not work your synchros pretty hard to go into 6th gear "under hard accelleration".

You can probably work around this problem easily by not shifting into 6th under hard accelleration. Hard accelleration up to and including 5th gear would seem the be the only rewarding strategy anyway?

:eek:


[Modified by wwashing, 2:00 PM 8/28/2001]

jasonberkeley

To clarify:

- I'm not winding out fifth gear, however, I am well over 100mph on the freeway and feel no need to use the additional revs when I don't have to.

- I'm also not SHIFTING hard. I am shifting very easily and taking my time completing the shift. The problem only seems to happen when I am accelerating hard (i.e. throttle floored or pretty close to it.)

- Jerry - I will DEFINITELY be at RA 9/29 and 9/30! Worst case is my gearbox goes at the track, and I replace under warranty and have a Z06 box with the better ratios put in! Also, only had the fluid changed in the slave cylinder. I actually did not request specifically that they do this. I brought the car into the dealership and told them to replace fluids in the diff, gearbox, engine oil, and brake fluid. They just kinda figured they would do that one too!

gpflepsen

And you bitch about all the speeding tickets you get :confused: :eek:

:D

I would have it diagnosed by the service department so if trouble comes your way 2-3 years down the road you can try to fall back on this.

Throwing in a set of Z06 gears might be nice too.

200plus

I have this same problem. (2000 FRC) I have to very carefully go into 6th,
and then very gently eas out the clutch. It's as though the shift lever
doesn't go back far enough to fully engage....

jasonberkeley

200plus:

Do you have a Ripper Shifter or stock unit?

Dr_Tony

Jason, why you would be flooring it between 5th and 6th is beyond me.

Someone said fruitless. I agree.

:confused:

66ImpalaLT1

The 5th/6th synchro is one of the smallest synchros in a t56, second only to the reverse synchro, and neither of these have cones. In other words its not designed to be shifted into under hard acceleration.

If you've been driving like this a lot, then I'm not suprised that you're having a problem. :eek:

Eric

Viprklr

I still don't see why you would be shifting from 5th to 6th with your foot to the floor. :confused: At 100 mph you'd have maybe 3500-3800 rpms in 5th gear right? Why not just wait until your foot is not on the floor and shift up to 6th? To me 6th gear is for cruising only. :crazy:

jasonberkeley

To all confused individuals:

It is very simple, and I guess if you don't drive well over 100mph on a regular basis for longer distances you wouldn't understand.

I want to continue to accelerate without using all of the extra engine revs (i.e I put alot of miles on the car and want to go easy on the engine. Cruising at 120 on the highway is not hard on the car).

The throttle is not always floored, but I am accelerating still. Shifts are done very slowly and deliberately.

Jason

SDVette

Personally, I stay in 5th until I'm done accelerating, then shift into 6th to cruise. 6th gear is way too tall for anything except slight acceleration, and if it's true that the syncros are lighter, I think the designers agree.

BatMobile

Agreed.

Do NOT use 6th gear for acceleration...drop to 5th, get to where you want to be, shift into 6th for steady state cruising.

FWIW

Neill

gpflepsen

How did this go from a question on shifting hard/grinding into 6th to a lecture on driving habits?
:rolleyes: :mad :confused: :D :eek: :cool: :cheers: :smash: :crazy: :yesnod: :lol: :blueangel: :jester :hat :conehead :p: :troll :U :seeya :boxing :chevy :cry ;) :( :sleep: :bb :bs :reddevil :spam :nopity :cuss :nono:

SDVette

It's not a lecture on anything! I was simply stating my (humble) opinion that he has damaged the syncro gears on his transmission by using 6th gear in the mannor he described. And since I drive differently, and my transmission is fine, I thought is was valuable information.

But maybe not - why don't you tell us your opinion instead of playing with the icons?

gpflepsen

SD, I don't mean to step on toes and ruffle feathers. Nothing was directed at you.

I guess all the icons didn't carry my lighthearted tone across.

FWIW I gave my opinion towards the top. :cheers:

SDVette

:cheers:

I think sarcasm is the most difficult thing to convey via email, even with emoticons!

Good luck,

SDVette (Fred)

jasonberkeley

How is accelerating in 6th gear, at fewer than 3000 rpms going to damage the syncros?