3.25 or 3.55

Rizz67 · 01-01-2001, 02:22 PM

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.

Rev · 01-01-2001, 03:18 PM

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.

Jaydee · 01-03-2001, 11:12 AM

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

01-01-2001, 02:22 PM	#1 (permalink)
Rizz67 Registered Member Join Date: Dec 2000 Location: Atlanta, GA USA Posts: 6	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.

Thread Tools
Show Printable Version Email this Page
Display Modes	Rate This Thread
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode	Rate This Thread:

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
3.55 gears.	66StangGuy	Classic Mustangs	6	08-12-2002 03:40 PM
3.55 vs. 3.73	TwiLighTBluEGT	Windsor Power	8	06-21-2002 01:44 PM
3.55 or 3.73?	DemonGT	Windsor Power	17	06-15-2001 02:54 AM
3.55, 3.73 or 4.10	Mouse Eater	Windsor Power	12	01-15-2001 08:03 AM
What about 3.55 Gears	rbenne	Classic Mustangs	6	11-25-2000 07:23 AM

01-01-2001, 03:18 PM	#2 (permalink)
Rev Registered Member Join Date: Nov 1998 Location: Houston, Tx. Posts: 3,887	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 (permalink)
Jaydee Registered Member Join Date: Sep 2000 Location: Conn. Posts: 220	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

Sponsored Links