WELCOME ALL NEW MEMBERS INTRODUCE YOURSELF HERE !
#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.
Reply
#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.
Reply
#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.
Reply
#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.
Reply


Possibly Related Threads...
Thread Author Replies Views Last Post
  hello members kylerobison 5 5,821 02-13-2013, 12:26 AM
Last Post: Rare Pony
  For the Cali Members TorqueKingsFounder 1 3,739 04-22-2012, 02:35 AM
Last Post: Steven Harris
  Introduce myself Endroman 5 4,983 09-23-2011, 11:51 AM
Last Post: 1969jimmach
  Introduce Myself Charlie Brown 5 5,528 08-07-2011, 01:39 PM
Last Post: Steven Harris
  Welcome all new members! Mach 1 Club 21 42,194 01-08-2011, 09:33 AM
Last Post: Mach 1 Club
  Introduce myself c9zx 9 9,793 07-09-2010, 06:46 AM
Last Post: jimbo

Forum Jump:


Users browsing this thread: 1 Guest(s)
[-]
Latest Threads
Rear brake issue
Last Post: Mustangmike
Yesterday 09:46 AM
» Replies: 8
» Views: 318
Is this noise normal?
Last Post: 1969_Mach1
04-17-2019 03:37 AM
» Replies: 9
» Views: 619
hdshadpar
Last Post: snah04
04-14-2019 10:47 PM
» Replies: 4
» Views: 920
70 Boss 302 - Night Mission build blog
Last Post: SWPruett
04-14-2019 01:29 PM
» Replies: 117
» Views: 92371
69 Mach 1 Headlight switch reinstall iss...
Last Post: combat32
04-12-2019 10:10 PM
» Replies: 9
» Views: 661
One piece headliners?
Last Post: SWPruett
04-11-2019 12:28 PM
» Replies: 9
» Views: 651
Garage Shots
Last Post: JTS71 Mach1
04-05-2019 09:51 AM
» Replies: 24
» Views: 15113
WELCOME ALL NEW MEMBERS INTRODUCE YOURSE...
Last Post: 1969_Mach1
04-03-2019 11:59 AM
» Replies: 63
» Views: 56776
Why are Americans so stupid? Stop buying...
Last Post: mymachone
04-02-2019 09:14 PM
» Replies: 9
» Views: 9064
Need Data plate decode help pls.
Last Post: Aris
03-30-2019 05:33 AM
» Replies: 6
» Views: 1027
1969 Mustang Paint Codes & Colors
Last Post: BLACK JADE 69
03-28-2019 02:46 AM
» Replies: 25
» Views: 14996
Been Awhile... '71 Rustang
Last Post: Mister 4x4
03-25-2019 07:22 AM
» Replies: 144
» Views: 116545
Throwback Picture
Last Post: Oztrailer
03-22-2019 07:05 PM
» Replies: 2
» Views: 629
1973 Mach 1 parts
Last Post: Oztrailer
03-21-2019 07:39 PM
» Replies: 7
» Views: 1701
Will buy parts in real good condition or...
Last Post: shopcarpro
03-21-2019 10:39 AM
» Replies: 2
» Views: 642
Manual Trans Gear Oil
Last Post: JTS71 Mach1
03-21-2019 10:21 AM
» Replies: 11
» Views: 1462
"Jacobra"
Last Post: Mustangmike
03-07-2019 09:03 AM
» Replies: 69
» Views: 27032
My Newest Project - My Youngest Child
Last Post: Steven Harris
03-05-2019 11:56 AM
» Replies: 39
» Views: 11585
1971 moch 1
Last Post: JTS71 Mach1
03-04-2019 07:11 AM
» Replies: 16
» Views: 1984
new member
Last Post: JTS71 Mach1
03-04-2019 07:09 AM
» Replies: 3
» Views: 598

>