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  Mustangsandmore Forum Archive
  '64 1/2 to '68 1/2 -- The Classic Mustang
  rear gears

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Author Topic:   rear gears
thedave66
Gearhead

Posts: 244
From: mountain home, idaho
Registered: Sep 2001

posted 01-02-2002 08:47 PM     Click Here to See the Profile for thedave66        Reply w/Quote
Right now I have a set of 3.00:1 8" gears cuz thats what came in the rearend when i bought the unit. I've got a 289 4 bbl and a 5-speed manual trans. It's a cruising car and i want to keep decent mileage on the freeway. would a set of 3.55:1's make a big difference in revs on the freeway?

dave

V8 Thumper
Gearhead

Posts: 4777
From: Phoenix, Arizona
Registered: Dec 2001

posted 01-02-2002 08:57 PM     Click Here to See the Profile for V8 Thumper        Reply w/Quote
Not with that 5 speed, it shouldn't. Depending on your tire size, at 70 mph with 3.55's you'll be turning 2600 rpm, +/-.

V8 Thumper
Gearhead

Posts: 4777
From: Phoenix, Arizona
Registered: Dec 2001

posted 01-02-2002 08:58 PM     Click Here to See the Profile for V8 Thumper        Reply w/Quote
Not with that 5 speed, it shouldn't. Depending on your tire size, at 70 mph with 3.55's you'll be turning 2600 rpm, plus or minus 100 rpm.

pthornton
Gearhead

Posts: 607
From: Austin, TX USA
Registered: Jun 99

posted 01-02-2002 11:19 PM     Click Here to See the Profile for pthornton        Reply w/Quote
Not sure what ratios are available with 8" rears, but with a 5 speed overdrive I would run a 3.73 or 4.11. As a matter of fact, I run a 3.73 in my 96 Saleen. It cruises like a dream on the interstate and gets 18 MPG in town and runs high 13 seconds in the quarter.

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Boss 302 & Saleen S281

iamblackjack
Gearhead

Posts: 219
From: A small town in South East Texas ............Houston.
Registered: Jan 2002

posted 01-03-2002 01:23 AM     Click Here to See the Profile for iamblackjack        Reply w/Quote
I've got 3.50 gears in my 65 and I got 17.7 on a road trip, with 600#s of people in it, and pulling a 4x8 trailer full of camping gear at 65 to 70 mph. I didn't believe it so I checked it on my way home. 16.9 mpg. I think I turned about 2300 to 2500 rpm. Oh yeah, I have a T-5 5 speed in it.

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Pair of '65s from Texas

thedave66
Gearhead

Posts: 244
From: mountain home, idaho
Registered: Sep 2001

posted 01-03-2002 05:40 PM     Click Here to See the Profile for thedave66        Reply w/Quote
well i'm convinced. Anybody got a spare set they're lookin to get rid of?

dave

65_289
Gearhead

Posts: 761
From:
Registered: Jul 2001

posted 01-03-2002 06:47 PM     Click Here to See the Profile for 65_289        Reply w/Quote
With my Tremec 3550, I have decided to go with 4.11's. Since I have a double pumper, heads, cam, etc, I figured what's a little more gas mileage gonna matter? Besides, they'll really help me from bogging off the line, and since I am crossing the line in 3rd gear, they should put me near 5200 rpm at my current trap speed.

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1965 Coupe, Tremec 3550, Steeda Tri-Ax, Cable Clutch conversion, 3.25 gears, Ford XB3 longblock, x303 heads, B-Cam, 9:1 comp., Tri-y headers, cut-outs, Ford Racing high-torque mini-starter, Pertronix Ignitor & Flamethrower coil, 650 double pumper, Edelbrock RPM intake, K&N air, Holley electric fuel pump & AFPR, dual 2-chamber Flowmasters, Summit 3-way fronts, Rancho 5-way rears, 5-leaf springs, Chrome Export Brace, Griffen Radiator, Comp. Eng. subs.

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