golden2husky

I have the same cold shift issue from 1 to 2. Not bad but it is certainly there. What helped for me is turning on the heat in the garage for the winter. Same for the lack of grip with summer tires. They love the radiant heat tubing in the concrete slab. Sadly after a minute outside, the grip problem returns...

Tito59

Ok, after complaint to the dealer and GM about 1-2' 2-3 crunch when cold and 4 weeks at the dealer...... A new transmitsion was finally installed.....nite and day difference with new transmission, crunch is gone!

Lots of arguing and getting pissed off to get this problem solved! In spite of all saying it was normal and it would be away...crunching in your tranny is not normal.

Paul

SnowyATX

Glad it worked out for you. I'm surprised they gave you a new one.

Cryokid

Obviously, the temperature is a contributing factor. I noticed two things: First make sure the clutch is fully engaged and second, I noticed that it was far less of a problem if I turned the Rev Matching off. Rev Matching works great on down shifting, but I think it causes multiple problems while upshifting. Wish you could turn the upshifting portion of Rev Matching off.

pickleseimer

After a cold start with outside air temp below 40F, my C5 does this, my C6 427 vert has done this since new, and I bet my C7 will do it as well. Not so much a grind, but definitely can feel it catching a tooth or two when upshifting. My opinion is that cold trans fluid makes the synchros sluggish. I also believe that the occasional grind is not detrimental to the trans as long as it doesn't become progressively worse.

I've found on those days that if I warm the engine for two minutes, exercise the gears once while sitting there, and then shift slowly the first few shifts, none of it happens. After the first few shifts, all is good. Somewhat elaborate procedure but it works for me.

SCorvette08

would you say that maybe a aftermarket short shifter like the one you here guys put in would help the situation or would the short shifter still give you the knochy feel also

z51vett

Use torque drive by amsoil will solve most of this problem.
z51vett
Doug

Green76

I don't think a new shifter will help at all, it's the syncros and transmission oil that probably causing the problem, also the clearances of all the part inside the transmission could affect how it shifts.....
That is just my opinion....

Cryokid

I agree, I have a short shifter and although it is nice to have it doesn't do a thing for the gear catching when the oil is cold.

Cryokid

Is this opinion/experience based on actually using it in the C7? I'd certainly like to make this go away or at least be minimized.

dbisc

POWER TRAIN:MANUAL TRANSMISSION

Date Reported
SEPTEMBER 01 2014
NHTSA Reference
#10056247
TSB Reference
#PI-1276
Description: CHEVROLET: WHEN MANUAL TRANSMISSION IS VERY DIFFICULT TO SHIFT INTO GEAR AT TIMES AND IT ALSO LACKS A CRISPNESS AND FEELS LIKE SHIFTER HAS A MUSHINESS ABOUT IT. MODEL 2014 CORVETTE. *PE UPDATED 12/9/14. *PE

Repair Information for NHTSA #10056247

Date Reported
JULY 01 2014
NHTSA Reference
#10056257
TSB Reference
#PIE-0302-A
Description: CHEVROLET: WHEN TRYING TO SHIFT INTO 1ST OR 2ND GEAR, THE MANUAL TRANSMISSION IS DIFFICULT AND NOISE, CLUNK/GRIND/RATTLE AND CLUTCH PEDAL NOISE IS HEARD AND OPERATION WOULD BE POOR. MODEL 2012-2014 CAMARO, CORVETTE. *PE

Repair Information for NHTSA #10056257

C66 Racing

AMSOIL Torque-Drive Synthetic Automatic Transmission Fluid (Product Code ATD1G)

For those that would like to give the Torque Drive a try (same fluid I use in my 02 Z06 at the track), more than happy to get AMSOIL products for forum members at dealer wholesale pricing, about 25% below retail, via the AMSOIL Preferred Customer Program. Drop me a PM if interested.

"BoneStock"

I have a mgw and it did not help the situation at all. I took the car out the other day and it was about 20* outside. Thats the coldest day i have had it out in yet, i had to jam it in second when the tranny was cold. It goes in ok when its cold at 2k rpm but 3k its almost impossible. When its warm there's no issue. Im gunna try a different tranny fluid as this really irritates me.

Jacob

It's clearly heat related. My C6 Z06 did this until the transmission was up to operating temperature. Actually, when the engine oil temp is up to operating temperature (say 80C or higher) , it turns out the trans is warmed up also. The Tremec 7 speed is worse than the 6 speed. An MGW shifter won't cure it, but it will cure the OEM shifter weaknesses. The MGM shifter is so direct it allows you to "feel" the notchiness more than the OEM shifter.

Redline D4 ATF definitely improved the C6 Z06 gearbox so I will do the same fluid change on the C7 Z06 after 3000 miles.

I assume it's simply the nature of these somewhat crude but robust gearboxes.

Jacob

dbaker

I changed my trans fluid at 700 miles.It was about 1/3 qt low.

Better fluid & full (4 qts) made the difference for me.

\db2

spearfish25

Well I'll give my 2c on changing from OEM fluids. In previous GM cars, i found the Amsoil and Redline fluids smoothed out the manual transmission shifts. Did the same on my Z06 but had a different end result. I used Amsoil Torque drive. initially the shifting was better. However, the fluid didn't hold up to track events and my shift to 4th started to get the nibbling/misaligned feeling on some shifts. Swapping back to the OEM fluid made the 3-4 shift instantly better again.

BlackMoon

Is there an updated OEM fluid for the M7 or is the Dex III auto fluid still used in the manuals? Thanks!

GOLD72

My 2011 ZR1 has done that since day one upshifting to second when cold when short shifting at low rpms. Usually only on the first shift of the morning. No other gears. Now have 40k miles. My 01Z and 06Z didn't do that.

Bill Dearborn

Cold temp nibble on the 1-2 shift is normal and should go away after less than a mile of driving. A crunch /nibble on the 2-3 shift isn't normal at any temp. Either the clutch is being let out too soon or there is some other issue.

Bill

PLRX

My Z06 does it, once it warms up all works fine. On warm up, I shift 1-3-6.