mach 1 stock comparison tech ???

ohfourmachone · June 21st, 2008, 01:56 AM

my buddies stock 04 mach1 (manual) redlines @ 6900rpm. my 04 mach 1 (auto)redlines @ 5900.can anybody out there help me figure out why? i know the stick has a forged crank as opposed to the autos casted crank but thats all ive been able to figure out. has to be more, help please? i was under the impression that the mach 1 had the same internals as the cobra but i know thats not the case.

TheBusher · June 24th, 2008, 01:29 PM

I'm not 100% sure, but I'm gonna assume the auto can't handle 7000 rpm

Doc8224 · June 24th, 2008, 05:58 PM

Its just the rev limit ford set for the auto. When mine was auto I turned it up to 6200. When I did the intake and exhaust it pulled to 6200-6300 very nicely. If the auto couldn't take 7k the cobra guys wouldn't be running it. The cast crank can take 7k too. It just a ford thing, no realy great reason.

TheBusher · June 24th, 2008, 07:33 PM

Originally Posted by Doc8224

Its just the rev limit ford set for the auto. When mine was auto I turned it up to 6200. When I did the intake and exhaust it pulled to 6200-6300 very nicely. If the auto couldn't take 7k the cobra guys wouldn't be running it. The cast crank can take 7k too. It just a ford thing, no realy great reason.

Are the cobra guys bolting on stock autos or built autos?

Doc8224 · June 25th, 2008, 04:13 AM

Originally Posted by TheBusher

Are the cobra guys bolting on stock autos or built autos?

Both. A stock 4R70 will handle 700 ft/lbs. A good converter and valve body is about the only thing you realy need to do. The rest of it will hold alot. If your a pushing realy big power then you would want a built one, but the auto is not the limited to 5900-6k rpm.

TheBusher · June 25th, 2008, 04:49 PM

Originally Posted by Doc8224

Both. A stock 4R70 will handle 700 ft/lbs. A good converter and valve body is about the only thing you realy need to do. The rest of it will hold alot. If your a pushing realy big power then you would want a built one, but the auto is not the limited to 5900-6k rpm.

Well then I guess that was just another poor decision by ford...

mr03mach1 · June 29th, 2008, 09:40 PM

The reason for the two different redlines is simply this,
03 & 04 Mach1 5speed came with the forged cobra crankshafts,
the autos came with cast crankshafts. Hope this helps.

TheBusher · June 30th, 2008, 12:27 PM

Originally Posted by mr03mach1

The reason for the two different redlines is simply this,
03 & 04 Mach1 5speed came with the forged cobra crankshafts,
the autos came with cast crankshafts. Hope this helps.

well if that's the reason then why would Ford cheap out on the autos and just use a cast crank?

June 21st, 2008, 01:56 AM	#1
ohfourmachone Look Ma! My First Post! 2004 mustang mach 1 13.59 Join Date: Jun 2008 Location: l.a. Posts: 1 iTrader: 0 reviews	mach 1 stock comparison tech ??? my buddies stock 04 mach1 (manual) redlines @ 6900rpm. my 04 mach 1 (auto)redlines @ 5900.can anybody out there help me figure out why? i know the stick has a forged crank as opposed to the autos casted crank but thats all ive been able to figure out. has to be more, help please? i was under the impression that the mach 1 had the same internals as the cobra but i know thats not the case.

June 24th, 2008, 05:58 PM	#3
Doc8224 N/A 4v Guru 2003 Mach 1 Join Date: Oct 2007 Location: Afghanistan Posts: 3,463 Blog Entries: 2 iTrader: 1 reviews	Its just the rev limit ford set for the auto. When mine was auto I turned it up to 6200. When I did the intake and exhaust it pulled to 6200-6300 very nicely. If the auto couldn't take 7k the cobra guys wouldn't be running it. The cast crank can take 7k too. It just a ford thing, no realy great reason. __________________ Military Crew U.S. Army Aviation Apache's Lead The Way

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June 29th, 2008, 09:40 PM	#7
mr03mach1 Look Ma! My First Post! Join Date: Aug 2007 Location: NH Posts: 1 iTrader: 0 reviews	The reason for the two different redlines is simply this, 03 & 04 Mach1 5speed came with the forged cobra crankshafts, the autos came with cast crankshafts. Hope this helps.

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