C4 tranny shifts

WeCircleTheProblem · September 13th, 2008, 02:25 AM

I have a 1968 coupe with a J-Code 302 and a c4...

my c4 seems to be shifting roughly 4-4200 rpms...

ok so ive done some research and found the 302 is more of a high rpm motor and ive also found that they make max hp at roughly 4800 rpms...should my trans be shifting higher? how do i change it?

(i havent owned this car to long but the previous owner told me they put a new valve assembly in the trans...and there is this box that i think is a rev limiter...)

MustangOne · September 13th, 2008, 01:25 PM

If your talking about Drag racing, Just shift manually.

Im sure you drive this car every day.

A stock 302 runs best from Idle to 5000 rpms. max hp of 225 hp for a 4V in a 1968 Stang.

The main question is what are you looking to get out of you car.

The Box should be a MSD Ignition box

The MSD 6A is the base model of the capacitive multiple spark discharge 6 Series design.

WeCircleTheProblem · September 13th, 2008, 09:35 PM

its a flame thrower ignition and shifting manually it wont got above 4200

MustangOne · September 14th, 2008, 01:25 AM

Going over 4200 rpms is not the C4.

Think of it like this, Try breathing through a straw.

That is what you are trying to ask your stock 302 to do.

What you need is more air flow in your motor.

Heads, Intake Carb, & Cam. Well let you car breath and go higher rpms.

My motor will spin 7500 RPMs and pull hard the all the way to it.
and I use a Stock C4 with a shift kit.

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WeCircleTheProblem · September 14th, 2008, 04:31 AM

i have a new intake, a new carb, and a new cam.

stalker · September 14th, 2008, 01:02 PM

nice ride mustang one!

MustangOne · September 14th, 2008, 01:44 PM

Just buying new stuff will not make it better,
You have to match it for what you want to do with it.
What did you buy?
Cam specs?
Intake brand type?
Carb brand size?

Thx, Stalker

WeCircleTheProblem · September 14th, 2008, 03:08 PM

i didnt do any of it the guy before me did.

i know its a edelbrock intake, a edelbrock 650 carb, but the cam i have no idea...

Kobra Killer · September 14th, 2008, 03:51 PM

The intake is probably the EB Performer & with that carb should go to 5500rpm.
I would also suggest headers & 2 1/2" exhaust, getting air in is only 1/2 of it.
Sounds like the cam, lifters, and/or valve springs is limiting your rpms.
Can you find out the make/model of the cam & lifters?

MustangOne · September 14th, 2008, 04:53 PM

What are you wanting to do with you car?

WeCircleTheProblem · September 14th, 2008, 08:52 PM

exhaust is my next thing. Its a weekend cruiser but i want it to have some ass for those occasional track days

September 13th, 2008, 02:25 AM	#1
WeCircleTheProblem Regular 1968 302 Coupe Join Date: Jul 2006 Location: Bel Air, MD Posts: 421 iTrader: 0 reviews	C4 tranny shifts I have a 1968 coupe with a J-Code 302 and a c4... my c4 seems to be shifting roughly 4-4200 rpms... ok so ive done some research and found the 302 is more of a high rpm motor and ive also found that they make max hp at roughly 4800 rpms...should my trans be shifting higher? how do i change it? (i havent owned this car to long but the previous owner told me they put a new valve assembly in the trans...and there is this box that i think is a rev limiter...) __________________ Mustang Club of Maryland Member Maryland Patriot Stangs & Fast Fords #002 Silver Mustang Club #0376 Daily Driver: '04 3.9L 5speed Weekend Cruiser: '68 302 Coupe

September 13th, 2008, 01:25 PM	#2
MustangOne Lost in the 60's 1968 GT 500 Super Snake 12.6 @ 114.3 Join Date: Mar 2008 Location: Sapulpa Oklahoma Posts: 1,950 iTrader: 0 reviews	If your talking about Drag racing, Just shift manually. Im sure you drive this car every day. A stock 302 runs best from Idle to 5000 rpms. max hp of 225 hp for a 4V in a 1968 Stang. The main question is what are you looking to get out of you car. The Box should be a MSD Ignition box The MSD 6A is the base model of the capacitive multiple spark discharge 6 Series design. __________________ MustangOne's Car's How to post Photos in Your Thread. Vote for your Favorite Ride of the month, Every Month Modded Mustangs Facebook Last edited by MustangOne; September 13th, 2008 at 01:30 PM.

September 13th, 2008, 09:35 PM	#3
WeCircleTheProblem Regular 1968 302 Coupe Join Date: Jul 2006 Location: Bel Air, MD Posts: 421 iTrader: 0 reviews	its a flame thrower ignition and shifting manually it wont got above 4200 __________________ Mustang Club of Maryland Member Maryland Patriot Stangs & Fast Fords #002 Silver Mustang Club #0376 Daily Driver: '04 3.9L 5speed Weekend Cruiser: '68 302 Coupe

September 14th, 2008, 04:31 AM	#5
WeCircleTheProblem Regular 1968 302 Coupe Join Date: Jul 2006 Location: Bel Air, MD Posts: 421 iTrader: 0 reviews	i have a new intake, a new carb, and a new cam. __________________ Mustang Club of Maryland Member Maryland Patriot Stangs & Fast Fords #002 Silver Mustang Club #0376 Daily Driver: '04 3.9L 5speed Weekend Cruiser: '68 302 Coupe

September 14th, 2008, 01:44 PM	#7
MustangOne Lost in the 60's 1968 GT 500 Super Snake 12.6 @ 114.3 Join Date: Mar 2008 Location: Sapulpa Oklahoma Posts: 1,950 iTrader: 0 reviews	Just buying new stuff will not make it better, You have to match it for what you want to do with it. What did you buy? Cam specs? Intake brand type? Carb brand size? Thx, Stalker __________________ MustangOne's Car's How to post Photos in Your Thread. Vote for your Favorite Ride of the month, Every Month Modded Mustangs Facebook

September 14th, 2008, 01:02 PM	#6
stalker Newbie Join Date: Aug 2008 Posts: 35 iTrader: 0 reviews	nice ride mustang one!

September 14th, 2008, 03:08 PM	#8
WeCircleTheProblem Regular 1968 302 Coupe Join Date: Jul 2006 Location: Bel Air, MD Posts: 421 iTrader: 0 reviews	i didnt do any of it the guy before me did. i know its a edelbrock intake, a edelbrock 650 carb, but the cam i have no idea... __________________ Mustang Club of Maryland Member Maryland Patriot Stangs & Fast Fords #002 Silver Mustang Club #0376 Daily Driver: '04 3.9L 5speed Weekend Cruiser: '68 302 Coupe

September 14th, 2008, 03:51 PM	#9
Kobra Killer Regular Join Date: Sep 2006 Posts: 123 iTrader: 0 reviews	The intake is probably the EB Performer & with that carb should go to 5500rpm. I would also suggest headers & 2 1/2" exhaust, getting air in is only 1/2 of it. Sounds like the cam, lifters, and/or valve springs is limiting your rpms. Can you find out the make/model of the cam & lifters? __________________ Clevelands Rule https://home.comcast.net/~jimmiephil...er_project.htm

September 14th, 2008, 04:53 PM	#10
MustangOne Lost in the 60's 1968 GT 500 Super Snake 12.6 @ 114.3 Join Date: Mar 2008 Location: Sapulpa Oklahoma Posts: 1,950 iTrader: 0 reviews	What are you wanting to do with you car? __________________ MustangOne's Car's How to post Photos in Your Thread. Vote for your Favorite Ride of the month, Every Month Modded Mustangs Facebook

September 14th, 2008, 08:52 PM	#11
WeCircleTheProblem Regular 1968 302 Coupe Join Date: Jul 2006 Location: Bel Air, MD Posts: 421 iTrader: 0 reviews	exhaust is my next thing. Its a weekend cruiser but i want it to have some ass for those occasional track days __________________ Mustang Club of Maryland Member Maryland Patriot Stangs & Fast Fords #002 Silver Mustang Club #0376 Daily Driver: '04 3.9L 5speed Weekend Cruiser: '68 302 Coupe

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