2016 C7 M7 Trans
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Joined: Feb 2015
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From: Knoxville TN
2016 C7 M7 Trans
I have a new C7 with M7. I am up to 1,000 miles and I still get a little transmission grind going into second gear when cold unless I wait a few seconds before pulling in. I thought it might just need some breakin time but I may have a problem. Anybody else had this experience? What was your solution?
E-Ray, 3LZ, ZER, LIFT
Joined: Sep 2007
Posts: 35,004
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From: NE South Carolina
I have a new C7 with M7. I am up to 1,000 miles and I still get a little transmission grind going into second gear when cold unless I wait a few seconds before pulling in. I thought it might just need some breakin time but I may have a problem. Anybody else had this experience? What was your solution?
FWIW, I find the cue ball shift **** I added is a help with the 1st to 2nd shift and pulling over to 7th. It also cuts the shift distance about 12% since it sits lower on the stick. This is a PDF of my install with lots of pics and some tricks if interested: http://wat.readyhosting.com/Shift_Knob.pdf
Great ****, reduces shift stroke and makes 1st to 2nd and side control better,
Team Owner
Joined: Oct 2004
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I have a new C7 with M7. I am up to 1,000 miles and I still get a little transmission grind going into second gear when cold unless I wait a few seconds before pulling in. I thought it might just need some breakin time but I may have a problem. Anybody else had this experience? What was your solution?
In the meantime, just be gentle and shift at a more leisurely pace. If it doesn't start getting noticeably smoother by 2K miles, I'd have it looked at.
Last edited by Foosh; Jun 17, 2016 at 10:14 AM.
Melting Slicks
Joined: Nov 1999
Posts: 2,372
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From: N Cal
I will be changing my trans fluid at 1500 miles. Draining out the assembly lube and fine metal from break in will help. Use the factory fill fluid and you will notice a HUGE improvement.
Le Mans Master
Joined: Nov 2015
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From: Lake Havasu City Arizona
I don't know if this helps. But my buddy has an M7 2016 and he has 10K on it. He had that grind issue and still does. He now just double clutches from first to second and that works for him. Shouldn't have to, but go figure.
Last edited by joemessman; Jun 17, 2016 at 11:03 AM.
E-Ray, 3LZ, ZER, LIFT
Joined: Sep 2007
Posts: 35,004
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From: NE South Carolina
Lots of threads about that issue, it is more common than not. In the summer I have no issue but in 40 degree weather it is harder. Some folks just go into 3rd until it's warm!
Last edited by JerryU; Jun 17, 2016 at 11:09 AM.
E-Ray, 3LZ, ZER, LIFT
Joined: Sep 2007
Posts: 35,004
Likes: 12,393
From: NE South Carolina
Some have and changed to other fluids and some just replaced with GM fluid, not cheap either way. As I recall no help for cold weather hard 1st to 2nd shift.
Lots of threads about that issue, it is more common than not. In the summer I have no issue but in 40 degree weather it is harder. Some folks just go into 3rd until it's warm!
Lots of threads about that issue, it is more common than not. In the summer I have no issue but in 40 degree weather it is harder. Some folks just go into 3rd until it's warm!
Toward the end he discusses multiple syncro's (although only two) and mentions paper linings (as in all automatic tans clutches) but the Tremic M7 has triple synrocs in some gears (no doubt in 2nd) and some are carbon faced.
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Joined: Dec 2014
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From: Carlsbad, CA
I have a new C7 with M7. I am up to 1,000 miles and I still get a little transmission grind going into second gear when cold unless I wait a few seconds before pulling in. I thought it might just need some breakin time but I may have a problem. Anybody else had this experience? What was your solution?
Team Owner
Joined: Sep 1999
Posts: 41,732
Likes: 1,718
From: Springfield MO
Common complaint in the C6 also. GM going to the carbon faced cones mid cycle helped some.
Many of us tried other lubricants. I first tried Royal Purple and it made things worse. Then I drained it and went with Mobil1 synthetic DEXIII ATF and it did help the cold shifting a little. Some reported good results using Redline.
When cold I don't double clutch, but I hesitate a half second, or so, when I pass through the neutral gate between 1st & 2nd gear, to allow time for the gear to match the shaft speed.
Many of us tried other lubricants. I first tried Royal Purple and it made things worse. Then I drained it and went with Mobil1 synthetic DEXIII ATF and it did help the cold shifting a little. Some reported good results using Redline.
When cold I don't double clutch, but I hesitate a half second, or so, when I pass through the neutral gate between 1st & 2nd gear, to allow time for the gear to match the shaft speed.
Last edited by JoesC5; Jun 18, 2016 at 10:38 AM.
Instructor
Joined: Jan 2015
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It will improve, just put some miles on the car. I assumed an issue on my m7 14' stingray. 1st to 2nd gear shift was by far the most un-smooth transition in any manual car I've ever driven.
Now with almost 6k on my car, problem isn't as noticeable or as harsh as when I first purchased the car.
Every time I've taken it to the dealer, I've dealt with new reps every time claiming they aren't smooth shifting cars simply because it is a tremec.
Atleast half of the concerns I've pointed out have been ignored by gm and staff. Some problems they have fixed, but some not simply because my "vin doesn't display a bulletin or recall"
Now with almost 6k on my car, problem isn't as noticeable or as harsh as when I first purchased the car.
Every time I've taken it to the dealer, I've dealt with new reps every time claiming they aren't smooth shifting cars simply because it is a tremec.
Atleast half of the concerns I've pointed out have been ignored by gm and staff. Some problems they have fixed, but some not simply because my "vin doesn't display a bulletin or recall"
E-Ray, 3LZ, ZER, LIFT
Joined: Sep 2007
Posts: 35,004
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From: NE South Carolina
Insides of an M7. The gears and gear clusters in an M7 are massive to handle the torque. Not like shifting a 2 Liter Honda!.
Last edited by JerryU; Jun 17, 2016 at 03:33 PM.
Safety Car
Joined: Mar 2014
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From: Kilmarnock Va
Double Cluth with synchronizers is A waste of his leg.
Safety Car
Joined: Oct 2012
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From: Austin Texas
St. Jude Donor '15
Clutch all the way in? I had a bit of trouble getting used to the clutch and found that I had to make certain that it was fully engaged before shifting. Now its old hat and the car shifts fine.
E-Ray, 3LZ, ZER, LIFT
Joined: Sep 2007
Posts: 35,004
Likes: 12,393
From: NE South Carolina
With warm trans fluid (after driving a few miles in the winter and always in the summer) never have difficulty with the 1st to 2nd or any other shift. When it's colder than ~45/50F in the first 2 or 3 miles I just pull harder in the 1st to 2nd shift but no syncro teeth grinding with that same amount of clutch depression. FWIW
Team Owner
Joined: Sep 1999
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From: Springfield MO
But, that didn't eliminate the "nibbles' when shifting from 1st to 2nd when the transmission fluid is cold.
Melting Slicks
Joined: Feb 2006
Posts: 2,172
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From: Des Moines Iowa
On my C6 Z06, I noticed that I wasn't fully depressing the clutch pedal because of the pedal position and the slope of the floorboard/firewall. I purchased a pedal extension( about 1.5" thick) for the clutch pedal and it makes driving much easier. Now I don't have to rotate my ankle to fully depress the clutch pedal.
But, that didn't eliminate the "nibbles' when shifting from 1st to 2nd when the transmission fluid is cold.
But, that didn't eliminate the "nibbles' when shifting from 1st to 2nd when the transmission fluid is cold.