C4, C6 Question

Dave Noll · 12-08-2014, 11:33 PM

I guess I'll start this by saying that my health is a limiting issue on doing heavy work on my car. That said, given one of each transmission comparibly prepared with similar convertors, EXCEPT, the C6 has a 2.75 gearset in it & my car is still a little light for "N". (the car 72 Cougar 351C 2BBL that has yet to touch its index) Opinion's ?

7423 · 12-09-2014, 12:56 AM

Without a doubt, the C4 is the better choice. Lighter, faster, cheaper, more room for headers. With a 2.91 low gear set, that 2V Cleveland will be very happy.

Dave Noll · 12-09-2014, 02:18 AM

How well do those 2.92 gear sets hold up ? I killed one of the stock 3 gear planets in my last C4. My headers will clear a C6, now..

vic guilmino · 12-09-2014, 08:05 AM

get a pro trans gear set for the c-4

Jim Caughlin · 12-09-2014, 12:12 PM

AS few years back, we swapped from a C6 to a C4 in a 2900# bracket car, small block, both trans were 8" converter, no trans brake. It went .25 quicker. Wasn't a perfect back to back test but pretty close. I have no question that there would be significant improvement switching to the C4. Lots of good parts for C4's these days, no reason for strength issues to be a problem.

Dave Noll · 12-12-2014, 03:07 AM

C4 it is,Thanks Guys. Guess I better get to selling some stuff to get one of those gearsets.

12-08-2014, 11:33 PM	#1
Dave Noll Senior Member Join Date: Nov 2007 Location: Div. 6, Eastern, WA Posts: 710 Likes: 2,681 Liked 240 Times in 112 Posts	C4, C6 Question I guess I'll start this by saying that my health is a limiting issue on doing heavy work on my car. That said, given one of each transmission comparibly prepared with similar convertors, EXCEPT, the C6 has a 2.75 gearset in it & my car is still a little light for "N". (the car 72 Cougar 351C 2BBL that has yet to touch its index) Opinion's ? __________________ Dave Noll, EF/S ,?/SA 6526

12-09-2014, 12:56 AM	#2
7423 Senior Member Join Date: Dec 2006 Posts: 639 Likes: 0 Liked 1 Time in 1 Post	Re: C4, C6 Question Without a doubt, the C4 is the better choice. Lighter, faster, cheaper, more room for headers. With a 2.91 low gear set, that 2V Cleveland will be very happy.

12-09-2014, 02:18 AM	#3
Dave Noll Senior Member Join Date: Nov 2007 Location: Div. 6, Eastern, WA Posts: 710 Likes: 2,681 Liked 240 Times in 112 Posts	Re: C4, C6 Question How well do those 2.92 gear sets hold up ? I killed one of the stock 3 gear planets in my last C4. My headers will clear a C6, now.. __________________ Dave Noll, EF/S ,?/SA 6526

12-09-2014, 08:05 AM	#4
vic guilmino Senior Member Join Date: Dec 2001 Location: wv Posts: 884 Likes: 42 Liked 56 Times in 21 Posts	Re: C4, C6 Question get a pro trans gear set for the c-4 __________________ Vic Guilmino 1129 STK

12-09-2014, 12:12 PM	#5
Jim Caughlin Senior Member Join Date: Mar 2002 Location: Woodburn, Or Posts: 685 Likes: 83 Liked 805 Times in 245 Posts	Re: C4, C6 Question AS few years back, we swapped from a C6 to a C4 in a 2900# bracket car, small block, both trans were 8" converter, no trans brake. It went .25 quicker. Wasn't a perfect back to back test but pretty close. I have no question that there would be significant improvement switching to the C4. Lots of good parts for C4's these days, no reason for strength issues to be a problem.

12-12-2014, 03:07 AM	#6
Dave Noll Senior Member Join Date: Nov 2007 Location: Div. 6, Eastern, WA Posts: 710 Likes: 2,681 Liked 240 Times in 112 Posts	Re: C4, C6 Question C4 it is,Thanks Guys. Guess I better get to selling some stuff to get one of those gearsets. __________________ Dave Noll, EF/S ,?/SA 6526 Last edited by Dave Noll; 12-12-2014 at 03:33 AM.