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Re: 4 speed rear gear ratios
[Re: rbstroker]
#1273288
07/24/12 10:32 PM
07/24/12 10:32 PM
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Joined: Aug 2003
Posts: 8,779
Mt.Gilead, Ohio
OhioMopar
master
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master
Joined: Aug 2003
Posts: 8,779
Mt.Gilead, Ohio
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Was 4.10 available before '69? I thought the Dana was only available with a 3.54 until the Super Track Pack came out?
1969 Dart GTS 340
1969 Super Bee X9 N-96
1969 Coronet R/T X9 N-96
2015 Dodge Dart GT
2019 Ram 2500 Big Horn.
Looking for the original block for my Bee. The last 4 are 7449
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Re: 4 speed rear gear ratios
[Re: rbstroker]
#1273289
07/25/12 09:35 AM
07/25/12 09:35 AM
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Joined: Sep 2006
Posts: 1,139
West Tennessee
rbstroker
OP
super stock
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OP
super stock
Joined: Sep 2006
Posts: 1,139
West Tennessee
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Quote:
In the late 60's-early 70's I think that most big block 4 speed Mopars came with 3.23's and had 3.55 or 4.10 as an option. Did the options go the other way also, like 2.94 or 2.76?
I guess my question isn't clear. I am wondering if numerically smaller rear gear ratios were available in big block 4 speed cars. I have never seen anything smaller than a 3.23. When I changed to 29" tires from the original 26.2", my engine/trans/clutch effectively are looking at a 2.92 ratio. Trying to figure if I should change to a 3.55 in order to get everything back to the factory configuration. I do have to slip the clutch a bit on launch with the current 3.23. Clear as mud now, huh?
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Re: 4 speed rear gear ratios
[Re: rbstroker]
#1273292
07/25/12 12:47 PM
07/25/12 12:47 PM
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Joined: Jan 2003
Posts: 75,095
A Banana Republic near you.
JohnRR
I Win
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I Win
Joined: Jan 2003
Posts: 75,095
A Banana Republic near you.
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Quote:
Quote:
In the late 60's-early 70's I think that most big block 4 speed Mopars came with 3.23's and had 3.55 or 4.10 as an option. Did the options go the other way also, like 2.94 or 2.76?
I guess my question isn't clear. I am wondering if numerically smaller rear gear ratios were available in big block 4 speed cars. I have never seen anything smaller than a 3.23. When I changed to 29" tires from the original 26.2", my engine/trans/clutch effectively are looking at a 2.92 ratio. Trying to figure if I should change to a 3.55 in order to get everything back to the factory configuration. I do have to slip the clutch a bit on launch with the current 3.23. Clear as mud now, huh?
Someone said it above , factory ratio in a big block 4 speed PERFORMANCE car was 3.23 , I don't think the lower gear ratios were optional in a big block.
If you want to get back gear ratio with your taller tire then you need to put a higher numerical ratio gear in the car or swap the trans to something with a taller first gear ... 3.09 ... , but then you have a big gear spread from 1st to 2nd.
Quote:
Looks like I am way off base. http://www.allpar.com/cars/plymouth/GTX.html
Apparantly the 4 speed GTX cars came with a 3.55 which means that I need a 3.91 to compensate with the 29" tires.
you didn't say what car , but if you have a factory 440 4 speed car it would have a dana 60 and the lowest gear in a dana in a performance car was 3.54 , 3.55 is an 8 3/4 gear ratio. You'll have a very hard time finding a 3.91 for a dana 60, don't think it was ever available. Chrysler didn't offer this but a 3.73 is available, next up is 4.10.
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