C4 auto hard shift

Tired of racKing your head? Tap in to someone else's experience, just asK for some advice.

C4 auto hard shift

Postby douglashwy » Sun Jun 24, 2018 3:40 pm

So taking off from a stop if I baby it the tranny won't shift too hard give it more gas and it stays in first for awhile and then jerks from 1st to 2 nd and chirps the tires sometimes goes sideways any suggestions
douglashwy
Kommitted
 
Posts: 167
Joined: Sun May 17, 2015 4:36 pm
Location: Utah

Re: C4 auto hard shift

Postby C6ZZKGT » Mon Jun 25, 2018 8:32 pm

Is this a new symptom?

-Fred-
66 K GT Fastback Silver Frost / Black Pony Interior
66 K GT Fastback Signal Flare Red / Black Pony Interior
65 K Coupe Phoenician Yellow / Black Standard Interior
65 A Code 4 speed Ranchero
64 289 4 Speed Falcon Sedan Delivery
66 Corvette 427 Roadster
User avatar
C6ZZKGT
Klassic
 
Posts: 7757
Joined: Fri Nov 25, 2011 10:35 am
Location: Canyon Country, California

Re: C4 auto hard shift

Postby jwc66k » Mon Jun 25, 2018 9:10 pm

douglashwy wrote:So taking off from a stop - if I baby it - the tranny won't shift too hard - give it more gas and it stays in first for awhile and then jerks from 1st to 2 nd and chirps the tires sometimes goes sideways any suggestions

I had difficulty reading this, so I put in some "stops".
The "symptoms" may be normal.
Jim
jwc66k
RidiKulous
 
Posts: 401
Joined: Fri Nov 25, 2011 11:07 am

Re: C4 auto hard shift

Postby douglashwy » Tue Jun 26, 2018 6:59 am

C6ZZKGT wrote:Is this a new symptom?

-Fred-

No not new. It's like it pauses for a sec and the boom 2 nd gear and tires chirp. I have to time it and take foot off gas an it will shift with less jerk but it definitely does not feel normal. It also engages hard from Park to drive.
douglashwy
Kommitted
 
Posts: 167
Joined: Sun May 17, 2015 4:36 pm
Location: Utah

Re: C4 auto hard shift

Postby C6ZZKGT » Tue Jun 26, 2018 8:42 am

douglashwy wrote:
C6ZZKGT wrote:Is this a new symptom?

-Fred-

No not new. It's like it pauses for a sec and the boom 2 nd gear and tires chirp. I have to time it and take foot off gas an it will shift with less jerk but it definitely does not feel normal. It also engages hard from Park to drive.


This is generally symptomatic of a failing transmission modulator. It can also be caused by a vacuum leak in the hose and tube assembly going to the modulator. The hose at the engine side of the vacuum tube is usually pretty solid but the 90 degree hose at the modulator can easily fall off or crack.

-Fred-
66 K GT Fastback Silver Frost / Black Pony Interior
66 K GT Fastback Signal Flare Red / Black Pony Interior
65 K Coupe Phoenician Yellow / Black Standard Interior
65 A Code 4 speed Ranchero
64 289 4 Speed Falcon Sedan Delivery
66 Corvette 427 Roadster
User avatar
C6ZZKGT
Klassic
 
Posts: 7757
Joined: Fri Nov 25, 2011 10:35 am
Location: Canyon Country, California

Re: C4 auto hard shift

Postby douglashwy » Tue Jun 26, 2018 4:55 pm

Thanks Fred I'll check it out
douglashwy
Kommitted
 
Posts: 167
Joined: Sun May 17, 2015 4:36 pm
Location: Utah


Return to Koncerns & Troubleshooting

Who is online

Users browsing this forum: No registered users and 1 guest