Ford C-6 rpms

dr.gonzo! · June 8th, 2007, 01:12 PM

My transmission is about to go out and I was wondering If I should go with the c6 or with the aod. Is the c6 ok for a daily driver and does anyone know what the rpms would be with 3.73 gears?

ryans88gt · June 8th, 2007, 01:38 PM

sure a c6 is OK if you don't mind the 25-30% drivetrain loss from the transmission alone. Not to mention they weigh a TON.

Did you mean a C-4? Much better transmission for a mustang. Without overdrive you are going to be pretty high up in the RPMs. It will be the same as only having 4 gears in a T-5.

Off the cuff, I would guess about 3000 rpms at 70 mph with 25-26" tires.
If you do a lot of highway driving you'll want an AOD. PA has some decently build AODs.

dr.gonzo! · June 8th, 2007, 02:16 PM

I heard it is a huge p.i.t.a. to convert to a manual and I thought a rwd already loses 30% loss so an aod takes 30% more?

ryans88gt · June 8th, 2007, 04:17 PM

No I was talking about a c6. It has a huge rotational mass and is also a big heavy tranmission. I wouldn't put a C6 in a mustang, period.

20% power loss is what I normally figure for driveline loss from a good automatic from the flywheel to the wheels

15% loss for a manual car

30% loss for something like a C6

An AOD is fine, a C4 is better for racing because it is light, has a low rotational mass, and can be built relatively strong. A C4 is no good on the highway though with 3.73s and street tires.

1slo5.0 · June 8th, 2007, 05:52 PM

A C6 is good for scrap and that's about it. A C4 is a much better choice.

5literJeff · June 8th, 2007, 05:58 PM

I have a c-6 and even though it shifts rock solid I wish I had gone with a c-4 instead. The powerloss from going to a c-6 from an AOD was noticeable.

Racinjason81 · June 9th, 2007, 12:05 AM

swapping over to a manual trans is a very easy conversion and is a lot more fun on the street.

turp · June 9th, 2007, 02:03 AM

How about an E4od? I know they are fairly good tranny's I have had no problems out of the one I had in my bronco.

June 8th, 2007, 05:52 PM	#5
1slo5.0 MM Ninjas! 1990 Mustang LX 9.36@143 mph Join Date: Jan 2006 Location: North Fond du Lac, Wisconsin Posts: 11,375 iTrader: 1 reviews	A C6 is good for scrap and that's about it. A C4 is a much better choice. __________________ My daily driver has 16 cylinders and 4400hp @ 1000 rpm.... ***1988 Mustang GT - Stock....almost

June 9th, 2007, 12:05 AM	#7
Racinjason81 Hardcore Enthusiast Join Date: Feb 2007 Location: New jersey Posts: 1,559 iTrader: 0 reviews	swapping over to a manual trans is a very easy conversion and is a lot more fun on the street. __________________ Heres a real funny video youtube.com/watch?v=ojB7KkaR03I VTEC stands for Very Torqueless Economy Car Honda stands for Hold On Not Done Accelerating 1991 LX 5.0 H/B(T-70 turbo coming soon)

June 9th, 2007, 02:03 AM	#8
turp My Stallion is Bigger! 1989 Eddie Bauer Bronco 3 feet... Join Date: Aug 2005 Location: VA Beach Posts: 3,012 iTrader: 0 reviews	How about an E4od? I know they are fairly good tranny's I have had no problems out of the one I had in my bronco. __________________

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June 8th, 2007, 01:38 PM	#2
ryans88gt MM Fanatic Join Date: May 2007 Location: Bloomington, IL Posts: 4,737 iTrader: 0 reviews	sure a c6 is OK if you don't mind the 25-30% drivetrain loss from the transmission alone. Not to mention they weigh a TON. Did you mean a C-4? Much better transmission for a mustang. Without overdrive you are going to be pretty high up in the RPMs. It will be the same as only having 4 gears in a T-5. Off the cuff, I would guess about 3000 rpms at 70 mph with 25-26" tires. If you do a lot of highway driving you'll want an AOD. PA has some decently build AODs.

June 8th, 2007, 04:17 PM	#4
ryans88gt MM Fanatic Join Date: May 2007 Location: Bloomington, IL Posts: 4,737 iTrader: 0 reviews	No I was talking about a c6. It has a huge rotational mass and is also a big heavy tranmission. I wouldn't put a C6 in a mustang, period. 20% power loss is what I normally figure for driveline loss from a good automatic from the flywheel to the wheels 15% loss for a manual car 30% loss for something like a C6 An AOD is fine, a C4 is better for racing because it is light, has a low rotational mass, and can be built relatively strong. A C4 is no good on the highway though with 3.73s and street tires.

June 8th, 2007, 05:58 PM	#6
5literJeff Regular Join Date: Jul 2006 Location: Blue Ridge, South Carolina Posts: 260 iTrader: 0 reviews	I have a c-6 and even though it shifts rock solid I wish I had gone with a c-4 instead. The powerloss from going to a c-6 from an AOD was noticeable.

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