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#61
Found this website, trying to figure out some stuff with my 1969 Mach 1,  it has 106,500 org miles, it was painted in the 80s, but the same color.
it is one of my favorite mustangs when i was growing up, so i finally found one for a great deal, well maybe a steal. the guy just got divorced and needed money.
anyway, its not a big block, couldnt have afforded that. its got a stock 351w 4bbl in it and still chirps second, its an automatic, as far as i know it never had any work done to it.
since i got back in 97 i have changed the wheels, fixed the door lock, fixed the choke, changed the radio, replaced the speakers, upgraded the front brakes to power and disk.
chrome valve covers, new headlight harness, upgraded headlights to halogen, upgraded to relays for the headlights and now the headlight switch to stop the flickering lights in the dash.
next on the list is the flowmaster exhaust kit i bought awhile ago. blah blah blah i have blabbed long enough.
there is some great info on this site, thanks for sharing.
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#62
When selecting a rear axle gear you need to also consider the trans.  Is it an auto or manual trans.  If its an auto trans, what torque convertor does it have.  If it's a manual trans and an old school 4 speed, is it a close ratio or a wide ratio.  Also tire size.  But assuming the tire size is close to or still stock:

Typically, if it has a C6 auto trans with a stock torque convertor, a 3.50:1 rear axle gear ratio is a popular choice for a street car.  You have to remember, on these older automatic transmissions with non-lockup type of torque convertors there is always some slippage in the torque convertor which means the motor and trans are never locked together in a 1:1 ratio.  So, the 3.50:1 rear axle gear will seem lower than it would in a manual trans car.

For a 4sp manual trans car, if it's a wide ratio trans then you can still get away with a 3.50:1 ratio since 1st gear in a wide ratio trans is fairly low.  A 3.70:1 ratio rear axle gear is also a viable choice.

For a 4sp close ratio trans car, now you will need something like a 3.89:1 ratio because 1st gear is very high in a close ratio transmission.  Like Mustangmike, I also use a 3.89:1 rear axle ratio with a close ratio top loader 4sp.  Driving around town is fun, but highway driving is not feasible.


So, if you have the first scenario listed above, I'd lean toward the 3.50:1 ratio.  My older brother had a setup like that back in the 1980's in a 69 Mach 1.  It was still fun around town and you can still do a little highway driving.
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#63
(04-03-2019, 02:15 AM)1969_Mach1 Wrote: So, if you have the first scenario listed above, I'd lean toward the 3.50:1 ratio.  My older brother had a setup like that back in the 1980's in a 69 Mach 1.  It was still fun around town and you can still do a little highway driving.

yeah, pretty sure it is 3.50:1 ratio its all factory stock minus the few things i changed. it is a Automatic transmission also.
my old 78 cobra 2 i had when i was 16 we put a shift kit in it and did some minor engine work and it would hit 2nd pretty hard and spin the tires.
got that one when i was 15 and parted ways after buying the 69 Mach 1, still miss that 78 had a lot of fun in that car.
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#64
(04-03-2019, 04:00 AM)combat32 Wrote:
(04-03-2019, 02:15 AM)1969_Mach1 Wrote: So, if you have the first scenario listed above, I'd lean toward the 3.50:1 ratio.  My older brother had a setup like that back in the 1980's in a 69 Mach 1.  It was still fun around town and you can still do a little highway driving.

yeah, pretty sure it is 3.50:1 ratio its all factory stock minus the few things i changed. it is a Automatic transmission also.
my old 78 cobra 2 i had when i was 16 we put a shift kit in it and did some minor engine work and it would hit 2nd pretty hard and spin the tires.
got that one when i was 15 and parted ways after buying the 69 Mach 1, still miss that 78 had a lot of fun in that car.

If it's all factory stock it probably has a 3.00:1 rear axle ratio from the factory.  That was the most common with a 351W 4 barrel and auto trans.  If that's the case, the 3.50:1 gear ratio will make it feel like a different car.  Double check the rear axle gear ratio.  With an open differential (non-posi of any type), with the rear axle supported on jack stands and the trans in neutral, hold one rear wheel so it cannot rotate, rotate the drive shaft and count how many revolutions the drive makes to complete two revolutions of the free rotating wheel.  I.E., for an open differential with a 3.00:1 gear ratio the driveshaft will rotate three revolutions for the free rotating wheel to revolve twice.
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