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Bosshos
New User
| Posts: 2
| Joined: 08/07
Posted: 08/25/07
08:57 PM
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My C6 Tranny for my 390 FE, in my 69 Mach 1 is needing a rebuild. My question is how much horse power am I giving up with the C6 compared to a C4, TKO500, a T5, a 4 speed top loader, or a street/strip preped C6? Has anyone ever compared the horse power differences on a chassis dyno? I know that the C6 absorbs quite a few horses, but how many or how much more that a manual trans or a C4? Can a hot C6 rebuild free up any horses? I rebuilt the engine and has been chassis dynoed to about 300hp. What can I expect in the real world after a new tranny? 
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Falcon67
Enthusiast
| Posts: 474
| Joined: 12/06
Posted: 08/30/07
02:45 PM
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Here's a thread on that: http://www.network54.com/Forum/119419/thread/1051282664/
"Found an old July, 1991 issue of Hot Rod that references hp loss for all major trans types. Data provided by Torque Convertors, Inc. more commonly known as TCI."
Transmission - HP Loss
Powerglide - 18
TH350 - 36
TH400 - 44
Ford C6 - 55-60
Ford C4 - 28
Chrysler A904 - 25
Chrysler 727 - 45
1967 Falcon 4 door 351C-4V
1970 Mustang 351C-2V
http://raceabilene.com/kelly/hotrod
Owner built, owner abused.
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