2 70 f100 problems
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2 70 f100 problems
Working bugs out of my f100.
Speedo is 10 mph slow (60=50)
Bad vibration from 62 to 70 mph.
Swapped drive shafts with new u joints, problems still there.
302, c4, short bed with one piece drive shaft.
Any Ideas helpful.
Speedo is 10 mph slow (60=50)
Bad vibration from 62 to 70 mph.
Swapped drive shafts with new u joints, problems still there.
302, c4, short bed with one piece drive shaft.
Any Ideas helpful.
Senior User
Joined: Feb 2005
Posts: 146
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From: Lewiston
71 problems
Have you balanced all four tires and wheels? If not, look for bent wheels when you have it done. Also, you may have a bearing problem too. I had the same problem on my 67 mustang, just about the same speed. I had the tranny rebuilt this past year, now the vibrations is gone. Just my two cents worth
Ford Parts Specialist
Joined: Nov 2006
Posts: 88,826
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From: Simi Valley, CA
Ford's plastic speedo DRIVEN gears (on the end of the cable) can be plus or minus 7-10 MPH.
If the speedo reads 10 MPH too slow, take away one tooth. If you take away two teeth, the speedo will read too fast.
The gears are all still available, the most expensive is: $3.47.
Vibration: Look for a broken rear spring: If a leaf breaks, the entire spring pack will shift over to one side taking the rear axle along with it.
This will cause a vibration and dog-tracking.
Dog-tracking: Ever follow directly behind a vehicle and be able to see ALL four tires instead of the usual two?
That's caused by a broken rear spring.
If the speedo reads 10 MPH too slow, take away one tooth. If you take away two teeth, the speedo will read too fast.
The gears are all still available, the most expensive is: $3.47.
Vibration: Look for a broken rear spring: If a leaf breaks, the entire spring pack will shift over to one side taking the rear axle along with it.
This will cause a vibration and dog-tracking.
Dog-tracking: Ever follow directly behind a vehicle and be able to see ALL four tires instead of the usual two?
That's caused by a broken rear spring.
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From: Faibanks Ak.
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From: East Flat Rock NC
Doc In Chatt
Welcome to ( FTE ) !
I think that you should make sure you have the Tires in the ( Size ) that you plan on running
,Low Profile, or Tall Tires will change your SpeedO reading, just make sure before buying
Parts or fixing the Problem, that this Problem may (REAPEAR) after a simple tire change!
Wally Womack
Welcome to ( FTE ) !
I think that you should make sure you have the Tires in the ( Size ) that you plan on running
,Low Profile, or Tall Tires will change your SpeedO reading, just make sure before buying
Parts or fixing the Problem, that this Problem may (REAPEAR) after a simple tire change!
Wally Womack
Last edited by Pro-Street/StateTK; Apr 22, 2009 at 08:24 AM. Reason: watching my Ps and Qs
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Fleet Mechanic
Joined: Dec 2006
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From: UPSTATE NY
when you serviced the driveshaft did you remember to put it back the same way it was? this can affect balancing if you do not mark it with chalk and if you installed it 90 degrees off in relation to the yolk for example. er um, the problem was happening before you even touched the driveshaft? nevermind
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Found most of the vibration was 2 out of balance tires.
Going to go back over the motor and trans mounts and everything else.
Got it from a guy that let a chevy driver install the motor and trans.
He pitched the 80,000 aod in the dumpster because he didn't know how to hook up the 3 wires coming out of it and put in a points distributer but forgot to tighten all transmission bolts.
Found that the hard way by loosing the starter on the interstate in Atlanta.
Going to go back over the motor and trans mounts and everything else.
Got it from a guy that let a chevy driver install the motor and trans.
He pitched the 80,000 aod in the dumpster because he didn't know how to hook up the 3 wires coming out of it and put in a points distributer but forgot to tighten all transmission bolts.
Found that the hard way by loosing the starter on the interstate in Atlanta.
