porterracing
Well-Known Member
Need some help, what gears do I have? 66 valiant 200 wagon 225. Was asked and had no clue! Thanks-Zach
Rear end?
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70DartMike
Too many projects
Most likely something around 2.9.
buckshotbishop
Old Soul
trapster
Well-Known Member
Jack one rear wheel off the ground, chock the other and put the car in neutral brake off.
Turn the rear wheel one revolution and count the number of times the drive shaft revolves.
I think you need to multiply this number by 2 because you are only turning one rear wheel. This will be your ratio.
It may be easier to rotate the wheel 10 times and count the revolutions of the drive shaft.
If the drive shaft revolves 13.5 times then your ratio would be 1.35 * 2 = 2.70 ish
16.25 would be 2 * 1.625 = 3.25 ish probably 3.23
it also will be easier if someone else counts the drive shaft revolutions while you count the tire revolutions.
If you cant turn the rear wheel then you may have a limited slip rear, in which case you may need to jack both rear wheels off the ground and you wouldn't need to multiply by 2. or you left the emergency brake on
Turn the rear wheel one revolution and count the number of times the drive shaft revolves.
I think you need to multiply this number by 2 because you are only turning one rear wheel. This will be your ratio.
It may be easier to rotate the wheel 10 times and count the revolutions of the drive shaft.
If the drive shaft revolves 13.5 times then your ratio would be 1.35 * 2 = 2.70 ish
16.25 would be 2 * 1.625 = 3.25 ish probably 3.23
it also will be easier if someone else counts the drive shaft revolutions while you count the tire revolutions.
If you cant turn the rear wheel then you may have a limited slip rear, in which case you may need to jack both rear wheels off the ground and you wouldn't need to multiply by 2. or you left the emergency brake on
bcschief
Well-Known Member
Most likely 3.23 ratio 7.25 rear axle but do check for a limited slip diff.
Brian
Brian
porterracing
Well-Known Member
Okay thanks for the help guys!
According to this page: http://www.hemmings.com/hcc/stories/2006/01/01/hmn_feature23.html
Rear axle
The Valiant used a hypoid gearset with semi-floating axles. The standard gear ratio was a 3.23:1 for six-cylinder-powered cars, both automatic and manual transmissions. The 273-cu.in. V-8 cars were equipped with a 2.94:1 ratio final drive; a Sure Grip differential with a 3.55:1 ratio was optional. Chrysler literature shows that the following ratios could be ordered: 2.91:1, 2.76:1, 2.94:1, 3.23:1, 3.55:1-Sure Grip and 3.91:1-Sure Grip.
That's different than what I've read about the 1964 Darts, where all 170s and manual transmissions got different gears than a 225 with an A904:
Standard axle ratios in 1964 were 2.93:1 with automatic transmission and 225 engine, or 3.23:1 with manual transmission and 225 engine, or with 170 engine and either transmission. A 3.55:1 ratio was optional.
(From: https://en.wikipedia.org/wiki/Dodge_Dart)
Rear axle
The Valiant used a hypoid gearset with semi-floating axles. The standard gear ratio was a 3.23:1 for six-cylinder-powered cars, both automatic and manual transmissions. The 273-cu.in. V-8 cars were equipped with a 2.94:1 ratio final drive; a Sure Grip differential with a 3.55:1 ratio was optional. Chrysler literature shows that the following ratios could be ordered: 2.91:1, 2.76:1, 2.94:1, 3.23:1, 3.55:1-Sure Grip and 3.91:1-Sure Grip.
That's different than what I've read about the 1964 Darts, where all 170s and manual transmissions got different gears than a 225 with an A904:
Standard axle ratios in 1964 were 2.93:1 with automatic transmission and 225 engine, or 3.23:1 with manual transmission and 225 engine, or with 170 engine and either transmission. A 3.55:1 ratio was optional.
(From: https://en.wikipedia.org/wiki/Dodge_Dart)
Woods74
Broke Senior
Everthing is right except the multiply by 2. Jack it up, neutral it, spin the tire one full turn, look at and count the revolutions of the shaft. Super easy.
69swinger340391
Well-Known Member
With one wheel chocked and one wheel spinning, you DO need to multiply driveshaft revolutions by 2 to get the correct ratio.
famous bob
mopar misfit
-------------------NOPE!!------------------------------------------------------------------------:wack:
trapster
Well-Known Member
The rear end ratio is the number of turns of the drive-shaft divided by the average number of turns of the wheels. if one wheel isn't turning then the other one is turning twice as fast. If the car is in park then the other wheel will turn backwards, averaging 0.
The outer wheel on a turn will always turn faster than the inner wheel, but the average will still maintain the ratio.
So multiply by 2.
The outer wheel on a turn will always turn faster than the inner wheel, but the average will still maintain the ratio.
So multiply by 2.
67Dart273
Well-Known Member
Sorry Bob read it again, he's right
With a "non" Sure Grip (non limited slip) axle and ONE wheel on the ground, the driveshaft "true ratio" is given when you turn the wheel TWO turns and count the shaft.
With a limited slip, you must jack up BOTH rear wheels and turn either wheel ONE turn, count the shaft.
Here's the whole deal............doing this, for me, is just about as easy as crawling around looking for axle tags WHICH MIGHT BE WRONG with a gear change in the span of 40 -50 years.
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