C4 vs. C6

[7upstang91]

I have heard that the C6 can handle more power. But also loses 60rwhp over the C4. Not an automatic guy but my step-brother has a C6 and we wanted to know. The car came with it.

 

[tannerc91gt]

Power loss through drivetrain Is percentage based, the c6 tranny is a more stout built trans but im not sure where your getting the 60hp loss info from

 

[faststang90]

yeah i think 60 hp is to hi over the c4 power loss. i was told before that a glide is 18% loss and a 3 speed tranny is about a little more and a aod tranny is 27% loss.

 

[Darkwriter77]

yeah i think 60 hp is to hi over the c4 power loss. i was told before that a glide is 18% loss and a 3 speed tranny is about a little more and a aod tranny is 27% loss.

Damn ... if that's true, then that means my '84 only has about ... 110.5 RWHP.

 

[white 89 GT]

yeah i think 60 hp is to hi over the c4 power loss. i was told before that a glide is 18% loss and a 3 speed tranny is about a little more and a aod tranny is 27% loss.

Yeah my aod must be killing me, time for a C4. 27% thats a bunch what could I do with that extra 8-10%

 

[bentley429isBAC]

C4's suck.

 

[90lxcoupe]

27% seems awful high, whered that number come from?

 

[white 89 GT]

I think 27% is high for a fully rollerized trans, but the AOD does suck up much more hp than most autos.
I don`t think c4`s suck, I think built correctly they perform very well.

 

[tannerc91gt]

15%-20% seems to be about the generally accepted amount of loss

 

[Darkwriter77]

Well, if a stock '87-'93 5.0 is rated at 225 HP at the flywheel, what are most folks showing for RWHP on a dyno with an AOD car? (I seem to remember around 190 HP being the norm for stock setup Foxes, but I think those were mostly on T-5 cars... )

 

[faststang90]

i dont remember where i got told that. i want to say it was from j&w.

 

[bentley429isBAC]

I think 27% is high for a fully rollerized trans, but the AOD does suck up much more hp than most autos.
I don`t think c4`s suck, I think built correctly they perform very well.

They sure do perform great. Then they break all the time. Anyways what are you doing with the trans whats in front of it, and do you want a brake?

 

[white 89 GT]

They sure do perform great. Then they break all the time. Anyways what are you doing with the trans whats in front of it, and do you want a brake?

If built right it will last, some upgrades are a must like the #9 bearing needs to be converted to roller and I want to use the broader trans 2.92 first gear planet.
No brake for me, I just foot brake it @ 1500 rpm and stab it. As for the AOD thats in my car now a buddy in texas wants it.

 

[7upstang91]

So the C6 is better than the C4?

 

[bentley429isBAC]

YES. Put a TH400 in it.

 

[ChromdOutDubs]

So the C6 is better than the C4?

I hated my C6, fully built with a custom Brake from JW. Broke it three times in a row, three different parts... I end up spending big money on my Mighty Mite C4 from Dynamic and haven't had a problem with their C4. Iv heard that the C6 pulls about 5-8% more drive train loss than the C4. After swapping from the C6 to the C4 it seemed like the C6 weighed 30lbs. more too.

Just my 2 cents...

-AJ