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Classic Mustangs Talk General Discussions

General discussions specific to 1964-1967, 1968-1970, and 1971-1973 Classic Mustangs. Discuss all non-technical topics related Vintage Mustangs here.

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Unread 04-14-2009   #1 (permalink)
ottawa1967 is offline Rookie

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Default Need rear end gear ratio advice

Hey Guys, I thought this question should be in the classic talk and not the classic tech section because the answer is pretty subjective. But thats what I want to hear.
I have a 67 fastback with the stock 8" rear end-it's coming out.
I recently installed a 347 stroker that I guestimate at 400hp/425 lbs of torque at 6000rpm. The transmission is a 5 speed TKO 600.
Here is my question. Whats a good street gear? I plan on running a 18" 285/35 tire with a trac loc posi. I want it to hook up in first gear at around 2000/2500 rpm or so with a soft/medium compund at 75 degrees of pavement temp.
I am wondering if a 4.11 is too radical. Any input would be greatly appreciated.
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Unread 04-14-2009   #2 (permalink)
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welcome to the forum i think 4.11 would be great, would sure gt u off the line in a hurry, that or 3.90
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Unread 04-14-2009   #3 (permalink)
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'Whats a good street gear?' What do you consider street gear? 0-30mph, 30-60, 70+ hwy? Be sure to be honest with yourself as to what 90% of your driving will be. That said, here's a neat calculator where you can add all your variables - tire size, rear gear, RPM, MPH and see what each gear size will do. I put them all into a spreadsheet so I could look across the columns and picked the gear that met 90% of my driving time.
Randy's Ring & Pinion. RPM Calculator.
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Unread 04-14-2009   #4 (permalink)
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I assume you are putting a 9" in. I also assume you are seeking advice based on personal experience. A third assumption necessary is the operating range of your 347, 2000-6000 rpm; probably peaking power around 5800 with a sweet spot from 3500 on up.

That being assumed, with the 5 speed, you need at least 3.50 gears. Personally, I think 4.11 is the maximum for any regular street use, even with the 5 speed. Personall, I have a 306 with an E cam and am running a 5 speed with 3.50 gears and it is just fine. Sure, 4.11's would get me down the quarter quicker but I don't go to the track often.
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Unread 04-14-2009   #5 (permalink)
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I think 4.11 would be a little low for street driving but with a 5 speed you can easily use 3.50 or maybe the 3.90. Try the calculator that Jonk67 posted and put in different gears.
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Unread 04-15-2009   #6 (permalink)
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Hi guys, great forum and thanks for the reponse to my question.
I'm looking for a good one two pull up to around 50-60mph.
I just want it to hook up fairly good. Not going to do any 1/4 mile stuff on a regular basis. I took a look at the calculator and when I punch in the numbers for my second gear ratio and a 25.8" tall tire I get 5760 RPM at 60mph (right in the sweet spot)
I think I have my answer. And yes, it is a 9" that's going in.
Thanks for the calculator.
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Unread 04-15-2009   #7 (permalink)
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i'm running 3.73's on mine and it seems to come off the line quick and highway rpms were good (with a 302)
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Unread 04-15-2009   #8 (permalink)
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Measure your actual tire height also, I found the tire ht. calc. to be off from my actual tire height.
Jon
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Unread 04-19-2009   #9 (permalink)
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Hey RemRem, when you say highway rpms were good - at what speeds and where abouts where your rpms sitting? Mine is mainly for driving around town but I want to be able to take random road trips down the highway if I want. Thanks.
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