C4 tranny problem ?

COPPERN · 06-22-2010, 09:30 AM

Had my c4 rebuilt and the car won't accelerate past 5000 rpm in first gear second and third it goes to 7500 rpm no problem.

Sixty foot times are also way off normally low 1.50 now 2.00 any ideas.

THANKS.

Bill Harris · 06-22-2010, 10:58 AM

Check the intermediate band adjustment. If it's too tight it will drag badly on the high gear drum that is turning about 85% of the input RPM, but the opposite direction.

ss3011 · 06-22-2010, 09:39 PM

Sounds like the high gear clutches are centrifugally applying in first gear. This could be caused by trapped oil behind the high gear piston, or a cross leak into the high gear clutch circuit.

COPPERN · 06-23-2010, 12:09 AM

Bill and ss3011 thanks for your replies

06-22-2010, 09:30 AM	#1
COPPERN Junior Member Join Date: Apr 2009 Posts: 13 Likes: 0 Liked 0 Times in 0 Posts	C4 tranny problem ? Had my c4 rebuilt and the car won't accelerate past 5000 rpm in first gear second and third it goes to 7500 rpm no problem. Sixty foot times are also way off normally low 1.50 now 2.00 any ideas. THANKS.

06-22-2010, 10:58 AM	#2
Bill Harris Member Join Date: Mar 2002 Location: Ooltewah, TN Posts: 421 Likes: 13 Liked 26 Times in 13 Posts	Re: C4 tranny problem ? Check the intermediate band adjustment. If it's too tight it will drag badly on the high gear drum that is turning about 85% of the input RPM, but the opposite direction. __________________ Bill Harris ex 2172 STK ex 2272 S/S

06-22-2010, 09:39 PM	#3
ss3011 Senior Member Join Date: Feb 2002 Location: Southeast Michigan Posts: 905 Likes: 69 Liked 237 Times in 112 Posts	Re: C4 tranny problem ? Sounds like the high gear clutches are centrifugally applying in first gear. This could be caused by trapped oil behind the high gear piston, or a cross leak into the high gear clutch circuit.

06-23-2010, 12:09 AM	#4
COPPERN Junior Member Join Date: Apr 2009 Posts: 13 Likes: 0 Liked 0 Times in 0 Posts	Re: C4 tranny problem ? Bill and ss3011 thanks for your replies