C6 vs C4
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From: s'toon sask
C6 vs C4
okay heres my problem. i've been running C6/351w combo in 89 ford 1/2 ton that sees frequent drag strip duty. last season the bell housing on the C6 split so i am going to have to replace it. should i replace it with a built C4 or go back to the C6. I heard that it takes significantly more power to turn a C6 than it does to drive a C4, but is this savings worth the loss in stength.
I now there are some pretty wild mustangs out there running C4's and i am wondering if they are standing up alright or if they are frequently destroyed. thanks.
I now there are some pretty wild mustangs out there running C4's and i am wondering if they are standing up alright or if they are frequently destroyed. thanks.
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if you were to chek you would find that before they came up with the "trick" transmissions they presently have for the drag strip there were quite a few people driving bowties and MOPARS that had adapted C6 for its strength. i would be curious how the housing broke. the C6 like the GM turbo 400 is a heavy trans but will take a tremendous amounr of abuse. the C4 even tricked out can only withstand so much torque. there is only so much room for strengthening. I am not trying to insult your understanding but i have had some peoplr assume they had a C6 because they knew it was not a C4 but turned out to be FMX. a lot of the 351w had the FMX
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From: s'toon sask
don't worry about insulting me, but this is definitly a C6. i am familiar with both the C6 and the FMX. This paticular 351w is origianlly out of a 73 mercury which had the FMX. when i rebuilt it and put it into this truck, which originally had an AOD, i swapped in the C6. The housing cracked immediatly after putting traction bars on so i am assuming it was just from the torque. i have heard of people also installing different internals in a C6 to make them more efficient. do you know anything about this.
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In an '89, it would be a C6 unless someone swapped in an FMX. The C6 has the one-piece housing, the FMX has a seperate bellhousing. I agree the C6 is a better choice than the C4 for a hard use/high torque application. The C6 and TH400 are about the strongest pickup truck auto transmissions ever made.
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Joined: Nov 2003
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From: Central Virginia
A well built C4 should be able to handle 400+ HP, while the C6 can handle 600+ HP / 600+ ft.-lbs. of torque... 
Running like you are, I would stay with the C6 and look into some heavy-duty
transmission upgrades..
http://www.transmissioncenter.net/C4_C6.htm
Running like you are, I would stay with the C6 and look into some heavy-duty
transmission upgrades..
http://www.transmissioncenter.net/C4_C6.htm
Last edited by Technonut; Jul 25, 2004 at 03:22 AM.
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I disagree Technonut. http://www.jegs.com/cgi-bin/ncommerc...27&prmenbr=361 Just add the bell housing of whatever motor you want to put it behind and you're all set. The company that makes it sells a bell housing made of a high strength aluminum alloy with bolt patterns for the 5.0/5.8, the 4.6, the 5.4, the V10, and the 390 and 428 FE.
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