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Old 01-20-2013, 09:20 PM   #1 (permalink)
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Default 3.55 gears..

Alright so once again I have a 1965 mustang completely stock expect the exhaust, headers, intake & carburetor. Everything else is completely stock. I found some 3.55's for $207.95. I think these are the correct ones, please let me know. And I also had another question, I've never done gears before so what should I expect out of them? Thanks again! Here is the link :
http://www.summitracing.com/parts/rmg-4901011
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Old 01-20-2013, 09:41 PM   #2 (permalink)
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Not sure what your budget is. But since you're taking the rear end out, maybe consider getting a trac-loc. Kind of pricey for it but well worth it if you're upgrading the rear end. I have trac loc with 3.40's and it's great on road and freeway
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Old 01-20-2013, 09:49 PM   #3 (permalink)
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That should work for a ford 8 inch. Im right in the middle of going from stock 2.7 to 3.25. You'll need a master installation kit also. The bearings can be difficult to remove/install so having a press will also assist you along with the swap.
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Old 01-20-2013, 11:06 PM   #4 (permalink)
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+3 for 3.40s. I put 3.55 in mine but if I did it over 3.40 would be a better choice.
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Old 01-20-2013, 11:19 PM   #5 (permalink)
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I don't know what your timeline is, but if you are patient, you can usually pick up gears for under $100 by trawling craigslist and some of the other forums more geared towards racing. I got my 3.55 for a 9" for $77 including shipping and paypal fees.
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Old 01-20-2013, 11:43 PM   #6 (permalink)
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Those look good but you'll probably want one of THESE too, along with a couple quarts of 80W-90 GL-5.

Just be prepared.....with 3.55's and a peg leg rear, you'll be spinning that inside tire like a commercial washing machine.
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Old 01-21-2013, 12:36 AM   #7 (permalink)
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Cool thanks guys.! I have a 3 speed auto transmission by the way I'm not sure which one it is but the stock one. So do you guys think the 3.40 would be better than the 3.55s'?
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Old 01-21-2013, 12:39 AM   #8 (permalink)
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Quote:
Originally Posted by Josuizzle16 View Post
Cool thanks guys.! I have a 3 speed auto transmission by the way I'm not sure which one it is but the stock one. So do you guys think the 3.40 would be better than the 3.55s'?
I would go with the 3.40 especially with a rear tire shorter then 26". You might try looking for a complete third member on Craigslist or ebay.
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Old 01-21-2013, 12:44 AM   #9 (permalink)
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Cool, this might be a dumb question, but what should I expect to see with better gears..?
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Old 01-21-2013, 12:48 AM   #10 (permalink)
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Quote:
Originally Posted by Josuizzle16 View Post
Cool, this might be a dumb question, but what should I expect to see with better gears..?
You will gain torque multiplication which will make your engine feel more powerful. You'll get better response off the line. You will see higher engine RPM with a corresponding loss in MPG. The loss in MPG will be due to 2 factors - one being the higher engine RPM and the other being your right foot. It's hard not to "get into it" to feel the power.

You'll probably also notice a smile on your face when you feel the quicker acceleration - hopefully this will offset the sadness of going the gas station more often.
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Old 01-21-2013, 12:50 AM   #11 (permalink)
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Cool, this might be a dumb question, but what should I expect to see with better gears..?
With an auto I would go with 3.25's at the most. You'll see better acceleration from a stop along with poorer fuel mileage. :-)
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Old 01-21-2013, 12:50 AM   #12 (permalink)
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Thanks for the answer I think the smile on my face will make up the gas station trips lol
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Old 01-21-2013, 01:06 AM   #13 (permalink)
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Alright so my last question.. I've heard to get 3.55, 3.40, and 3.25.. So considering everything that I have what would be the best option for me..
Stock auto 3 speed tranny, 289 with headers, exhaust, intake, and 600 CFM carburetor and I think thats it.. So what do you guys think my best option is? Thanks!
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Old 01-21-2013, 01:16 AM   #14 (permalink)
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I've got 3.00's behind a top loader (same final drive ratio in 4th as a C4 in drive), and I'm dead on 3,000rpm at 70mph on 215/65R15's. I like driving on the highway and I don't think I'd want to go much lower than this.
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Old 01-21-2013, 01:34 AM   #15 (permalink)
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Its up to you, but the higher you go the higher the rpm will rise. The 3.55 with your stock c4 will drive you crazy on the freeway. They will keep you at 55 mpr. Also I'm not sure if Richmond changed their ways, but their gears suck I would go with motive gears or something better. My.02
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