Choosing a 9-inch Rear End, '66

Grvy65 · April 1st, 2007, 12:30 PM

I'm converting to a mild 347 with intention of a daily driver. Any suggestions on differential considerations (limited-slip, posi, etc)? Sources in the Sacramento area? I'm leaning towards limited slip, about 3:25 - 3:40.

Thanks,

Fred

Horseshoeing · April 2nd, 2007, 05:48 AM

limited-slip. Do you have a Auto?

Grvy65 · April 2nd, 2007, 09:33 AM

Thanks. Yes, it's a '66 GT Coupe, four-speed.

Racinjason81 · April 2nd, 2007, 04:00 PM

how huch highway driving do you do?limited slip and posi is the same,but stay away form lockers for a DD.What type of engine parts are you using.

Grvy65 · April 3rd, 2007, 12:04 AM

...it'll be mostly open road driving, pleasure / daily driver. The 347 is a stroked 302, about 400 hp / 400 Lbs Tq., 9.7:1 compression, fully roller, very streetable with a nice lob to it, nothing too wild. Also converting to a T5z tranny.

Horseshoeing · April 3rd, 2007, 06:28 AM

A limited slip and posi are NOT the same. You want a limited slip. A posi unit is locked all the time and is not for street use. With a T-5 in the works, I would get a 3.55 to 3.89 rear end gear.

April 1st, 2007, 12:30 PM	#1
Grvy65 Newbie Join Date: Mar 2007 Posts: 9	Choosing a 9-inch Rear End, '66 I'm converting to a mild 347 with intention of a daily driver. Any suggestions on differential considerations (limited-slip, posi, etc)? Sources in the Sacramento area? I'm leaning towards limited slip, about 3:25 - 3:40. Thanks, Fred

April 2nd, 2007, 05:48 AM	#2
Horseshoeing Classic Moderator Join Date: Aug 2005 Location: GA Posts: 4,179	limited-slip. Do you have a Auto? __________________ Classic Mustangs are the best! Get one.

April 2nd, 2007, 04:00 PM	#4
Racinjason81 Hardcore Enthusiast Join Date: Feb 2007 Location: New jersey Posts: 1,198	how huch highway driving do you do?limited slip and posi is the same,but stay away form lockers for a DD.What type of engine parts are you using. __________________ Speed kills drive an import and live forever. 1991 LX 5.0 H/B 1990 T-BIRD SC

April 3rd, 2007, 06:28 AM	#6
Horseshoeing Classic Moderator Join Date: Aug 2005 Location: GA Posts: 4,179	A limited slip and posi are NOT the same. You want a limited slip. A posi unit is locked all the time and is not for street use. With a T-5 in the works, I would get a 3.55 to 3.89 rear end gear. __________________ Classic Mustangs are the best! Get one.

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April 2nd, 2007, 09:33 AM	#3
Grvy65 Newbie Join Date: Mar 2007 Posts: 9	Thanks. Yes, it's a '66 GT Coupe, four-speed.

April 3rd, 2007, 12:04 AM	#5
Grvy65 Newbie Join Date: Mar 2007 Posts: 9	...it'll be mostly open road driving, pleasure / daily driver. The 347 is a stroked 302, about 400 hp / 400 Lbs Tq., 9.7:1 compression, fully roller, very streetable with a nice lob to it, nothing too wild. Also converting to a T5z tranny.

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