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01-01-2001, 02:22 PM | #1 |
Registered Member
Join Date: Dec 2000
Location: Atlanta, GA USA
Posts: 6
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3.25 or 3.55
I have been reading about whivh gear set to go with, but im getting mixed results. I currently have the stock 2.75 in the back, which is great for highway use, however im mainly on traffic streets. I was thinking about a 3.55, but ive been told by somepeople that the engine will be spinning pretty high on the freeway. My trans is C4, out of a 79-81 mustang. It does have a B&M shiftkit, and a TCI torque converter. If any suggestions please help.
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01-01-2001, 03:18 PM | #2 |
Registered Member
Join Date: Nov 1998
Location: Houston, Tx.
Posts: 3,887
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With a c-4 and 26" tires, I'm turning 3000 rpm at 70 mph with my C-4 and a3.25. If I was running a 3.55, I'd be running 3275 rpm's at 70mph. That's a little much for me, but it's something only you can decide. Hope this helps a little.
------------------ '66 Coupe, 306, 300 HP, C-4, 13.97 e.t., 100.3 mph 1/4 mi. |
01-03-2001, 11:12 AM | #3 |
Registered Member
Join Date: Sep 2000
Location: Conn.
Posts: 220
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My 65 with 25 1/2" tires and a 3.50 gear turns 2850 rpm @ 60 mph. If the bulk of your driving is mainly in town the extra snap of the 3.55's is the way to go. Also, as Rev mentioned, overall tire diameter has a definite effect on your cruising rpm
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