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Author
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Topic: Mustang II Center Section in a 65 Mustang?
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65 fastback
Journeyman Posts:
From:
Registered:
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posted 09-17-2006 11:22 PM
 
I have a chance to buy a 3.55 8-inch LSD center section from a Mustang II for my 65 Mustang with a C-4 automatic. Before I dish out the cash, will this work in my car? The yoke looks smaller than the 65, if so, can it be swapped out? What do you guys think of the 3.55 gears? I have 24 inch dia. tires, and do a little highway driving, so revs will be high at 65-70 mph. Any help would be appreciated.
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68 Coop
Gearhead Posts: 5847
From: Mesquite, NV. 89027
Registered: Oct 2004
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posted 09-18-2006 12:04 AM
quote:
Originally posted by 65 fastback:
What do you guys think of the 3.55 gears? I have 24 inch dia. tires, and do a little highway driving, so revs will be high at 65-70 mph. Any help would be appreciated.
I have 3.55's, and the rpm's went up a little at highway speeds, but nothing drastic. I was running 2.79's before these. I'm also running 295 50's in the rear. Hope this helps some  .------------------
William
M&M# 4256
MCA# 64831 68 Coupe
289
C4
3:55's/Trac-Lok
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Ryan Wilke
Gearhead Posts: 3237
From: Stanton, Michigan, zip 48888
Registered: Oct 2000
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posted 09-18-2006 10:31 AM
quote:
Originally posted by 65 fastback:
What do you guys think of the 3.55 gears? I have 24 inch dia. tires, and do a little highway driving, so revs will be high at 65-70 mph.
Sorry, I don't have any experience about what yoke comes on a MII or what yoke you have now. Shooting from the hip though, I'd say they should swap out ok... Regarding highway rpms being higher, higher than,,,what? What rearend gear ratio are you running now? If you can determine your current rearend ratio, you can determine the highway rpms (if you don't have a tach now) by using this formula and then plug the 3.55 gear into the formula and compare.... http://users.erols.com/srweiss/calcrpm.htm If you plug in the values of:
65mph,
a 3.55 gear,
on a 24" tire,
C-4 high gear of 1.0
.........it gives you 3230rpms.
Is that "too high"? That's up to you. I'd suggest that if you'd do more than 25 highway miles one way @ 3200+ rpms and if you have a "performance" exhaust system, you may want to wear ear plugs for the drive! Good Luck!
Ryan 
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Ryan Wilke
Gearhead Posts: 3237
From: Stanton, Michigan, zip 48888
Registered: Oct 2000
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posted 09-18-2006 10:46 AM
quote:
Originally posted by 68 Coop:
I have 3.55's, and the rpm's went up a little at highway speeds, but nothing drastic. I was running 2.79's before these. I'm also running 295 50's in the rear.
William, Keep in mind that your 295/50 tires (I'm assuming they're on 15" rims) is quite a bit taller than Dustin's 24" tires. Your tirs are probably about 2.7" taller. So when YOUR tire diameter is plugged into the formula; http://users.erols.com/srweiss/calcrpm.htm 65 mph
3.55 gear
26.7" tire
C-4 3rd gear of 1.0 ...give you just 2904 rpms.
...300+ rpms less than what Dustin would see with his 24" tires. Ryan
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Moneymaker
Administrator Posts: 29200
From: Lyons, IL, USA
Registered: May 99
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posted 09-18-2006 12:48 PM
The swap is a piece of cake.
The yokes can be interchanged as well.
Go for it!------------------
Alex Denysenko
Co-Administrator and Moderator NHRA/SRA member and licensed Superstock driver
NHRA and IHRA SS/LA & SS/MA National Record Holder '00,'01,'02,'03,'04 &'05
First NHRA & IHRA 289 automatic Superstock Mustang in the TENS 06-99
First SS/MA in the TENS 04-03
IHRA division 5 Superstock Champion
Fleet of FoMoCo products including 88 ASC McLaren Mustang #28 The Barry of BarrysGrrl Quote #1: "I never met a magazine mechanic I liked."
Quote #2: "Make sure brain is in gear before engaging mouth!"
Quote #3: "If you can't run with the big dogs, stay on the porch!"
www.moneymakerracing.com
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68 Coop
Gearhead Posts: 5847
From: Mesquite, NV. 89027
Registered: Oct 2004
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posted 09-18-2006 12:51 PM
Thanks Ryan, I can't really tell how much it threw it off, but the speedo is wrong now. I was just going by the tach, and it jumped up to right around what you have posted. I don't get on the highway much any more tho, Hell I don't even drive it much any more, bad starter pinion/flex plate makes it too hard to start. I wish I knew 1/2 of what you know about these cars .------------------
William
M&M# 4256
MCA# 64831 68 Coupe
289
C4
3:55's/Trac-Lok
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65 fastback
Journeyman Posts:
From:
Registered:
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posted 09-18-2006 10:57 PM
I picked up the center section this evening and it has the same measurements as my stock axle. Thanks for everyone's input.
Mike
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