C6 vs C4

SLEEEPER · 11-06-2001, 11:20 PM

Which is a more preferable tranny. Is the C6 concedered a HD tranny? stronger than a c4?

PKRWUD · 11-07-2001, 02:46 AM

The c6 is damn near bullet-proof, but it weighs as much as a Sherman tank.

Take care,
-Chris

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Retired Moderator
MustangNet

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mustangman65_79 · 11-07-2001, 06:56 AM

The c6 tranny was used for the bigger, stronger engines like the 351 and 400. The c4 was used for the smaller engines like the 289 and 302. I have a c4 in my mustang, and a c6 in my bronco, I like the c6 better. I have heard of c6's being bolted up to a 302 or 289, I also heard that there were a few '66 mustangs that came stock with a c6, try to find that.

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66' Mustang 2bbl 289 coupe, stock.
79' Mustang soon to be a 302-selling-
89' Bronco 351w
AIRMEN FIRST CLASS
KASPAR T. HOWE

Ron1 · 11-07-2001, 03:42 PM

The biggest dis-advantage to the C6 is the weight. The aftermarket C4's being built today can be made to handle over a 1000 horse. Most racers prefer the C4 because of the weight advantage.

BTW...It seems every time I heard "hey it's bulletproof" always ended upbeing followed by "sorry man, it's toast"

Shaggy · 11-08-2001, 01:42 PM

Here is my expierence built (manual valve body and all) c-4's would last me about a month.....stock c-6 with a b&m shift kit still good 1 1/2 years later. I run about .3 quicker with the c-6 but I attribute that to the fact I put an 10 in convertor in with it verses the 11 in I had in the c-4 actual weight gained after transplant was less than 50 pounds and have watched a drag (hp to turn the output shaft) comparsion betweeen a c-4 and a c-6 they have the same parisitic loss. Now the thing I am sure to get the flames started with but all the sub 10 sec. fords I know either have 2 c-6's one for back up at the track or 3 c-4's one to run one for backup or one being rebuilt after only a weekend of racing verses getting a season or more out of a c-6. With that I wish you luck on your decision.

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67 Falcon Small Block,C-6,3.25 spool, best ET to date 13.2 tore that motor down and found 3 spun rod bearings and 2 flat lobes on the cam hoping for 12's with the same setup just fresh same cam grind and all.

11-06-2001, 11:20 PM	#1
SLEEEPER Registered Member Join Date: Nov 2001 Posts: 4	C6 vs C4 Which is a more preferable tranny. Is the C6 concedered a HD tranny? stronger than a c4?

11-07-2001, 02:46 AM	#2
PKRWUD Junior Member Join Date: Mar 1999 Location: Ventura, California Posts: 8,981	The c6 is damn near bullet-proof, but it weighs as much as a Sherman tank. Take care, -Chris ------------------ Retired Moderator MustangNet My site: Peckerwoods Pit Stop My teams site: Jim Porter Racing RACECAR spelled backwards is RACECAR HEY !!! Are you ASE Certified ??? If you are, ask me about iATN.

11-07-2001, 06:56 AM	#3
mustangman65_79 My poor 79 RIP Join Date: Oct 2001 Location: Suisun City, Posts: 2,320	The c6 tranny was used for the bigger, stronger engines like the 351 and 400. The c4 was used for the smaller engines like the 289 and 302. I have a c4 in my mustang, and a c6 in my bronco, I like the c6 better. I have heard of c6's being bolted up to a 302 or 289, I also heard that there were a few '66 mustangs that came stock with a c6, try to find that. ------------------ 66' Mustang 2bbl 289 coupe, stock. 79' Mustang soon to be a 302-selling- 89' Bronco 351w AIRMEN FIRST CLASS KASPAR T. HOWE

11-07-2001, 03:42 PM	#4
Ron1 Registered Member Join Date: Sep 1999 Location: Vancouver, WA USA Posts: 439	The biggest dis-advantage to the C6 is the weight. The aftermarket C4's being built today can be made to handle over a 1000 horse. Most racers prefer the C4 because of the weight advantage. BTW...It seems every time I heard "hey it's bulletproof" always ended upbeing followed by "sorry man, it's toast"

11-08-2001, 01:42 PM	#5
Shaggy Registered Member Join Date: Feb 1999 Location: Houston,TX Posts: 466	Here is my expierence built (manual valve body and all) c-4's would last me about a month.....stock c-6 with a b&m shift kit still good 1 1/2 years later. I run about .3 quicker with the c-6 but I attribute that to the fact I put an 10 in convertor in with it verses the 11 in I had in the c-4 actual weight gained after transplant was less than 50 pounds and have watched a drag (hp to turn the output shaft) comparsion betweeen a c-4 and a c-6 they have the same parisitic loss. Now the thing I am sure to get the flames started with but all the sub 10 sec. fords I know either have 2 c-6's one for back up at the track or 3 c-4's one to run one for backup or one being rebuilt after only a weekend of racing verses getting a season or more out of a c-6. With that I wish you luck on your decision. ------------------ 67 Falcon Small Block,C-6,3.25 spool, best ET to date 13.2 tore that motor down and found 3 spun rod bearings and 2 flat lobes on the cam hoping for 12's with the same setup just fresh same cam grind and all.