3.23 or 3.55 behind 71 340 727 Auto???
#781918
08/23/10 09:52 PM
08/23/10 09:52 PM
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Joined: Apr 2003
Posts: 915 near New Haven, CT
fireeng
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OP
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I'm finally getting my car done. I have my choice of ratios as I have one of each in my stcok pile. I'm building the car mild enough so my wife could drive it if she likes. I'm leaning toward the 3.55s so its a little quicker off the liune but I'd also like to drive at 65 mph for 40 miiles or so every once and a while. I've been out of the game since I was a teenager so I could use some knowledge on how these ratios differ. Thanks....
2016 Diesel Ram 3500 Mason Dump 1971 Challenger 2013 Jeep Wrangler 1979 Dodge Ram Power Wagon 400 Mini Pumper My other car is a Fire Truck.
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Re: 3.23 or 3.55 behind 71 340 727 Auto???
[Re: derekeh]
#781921
08/23/10 10:05 PM
08/23/10 10:05 PM
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Joined: Apr 2003
Posts: 915 near New Haven, CT
fireeng
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I didn't even consider tire size. What size tire is 26" tall?
Last edited by fireeng; 08/23/10 10:07 PM.
2016 Diesel Ram 3500 Mason Dump 1971 Challenger 2013 Jeep Wrangler 1979 Dodge Ram Power Wagon 400 Mini Pumper My other car is a Fire Truck.
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Re: 3.23 or 3.55 behind 71 340 727 Auto???
[Re: fireeng]
#781923
08/23/10 10:08 PM
08/23/10 10:08 PM
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Joined: Jan 2003
Posts: 20,773 Eagle, Idaho
Neil
The Doctor is in.
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The Doctor is in.
Joined: Jan 2003
Posts: 20,773
Eagle, Idaho
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Quote:
I didn't even consider tire size. What size tire is 26" tall?
235-60-15 are advertised as being 26" in diameter.
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Re: 3.23 or 3.55 behind 71 340 727 Auto???
[Re: Neil]
#781924
08/23/10 10:11 PM
08/23/10 10:11 PM
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Joined: Apr 2003
Posts: 915 near New Haven, CT
fireeng
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OP
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235-60-15 are advertised as being 26" in diameter.
I think those are in the ball park of what I would use. Do you think the 3.55s will be really winding out for that highway ride?
2016 Diesel Ram 3500 Mason Dump 1971 Challenger 2013 Jeep Wrangler 1979 Dodge Ram Power Wagon 400 Mini Pumper My other car is a Fire Truck.
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Re: 3.23 or 3.55 behind 71 340 727 Auto???
[Re: ademon]
#781927
08/23/10 10:27 PM
08/23/10 10:27 PM
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Joined: Feb 2005
Posts: 28,312 Cincinnati, Ohio
Challenger 1
Too Many Posts
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Too Many Posts
Joined: Feb 2005
Posts: 28,312
Cincinnati, Ohio
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Quote:
3.55, especially if going with a tire taller that 26"
My 440 car with 28" tires has a 3:54 My 340/727 with 26" tire has a 3:55
I think they are perfect for the street and I can tell the difference between 26-28" tires.
I drive my 340 car with 26" tires on the highway all the time. It tachs about 5000 rpm at 120 mph with 3:55 and 26" tires. speedo says 135 but the GPS said 120mph at 4900+ rpms
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Re: 3.23 or 3.55 behind 71 340 727 Auto???
[Re: Challenger 1]
#781928
08/24/10 01:10 AM
08/24/10 01:10 AM
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Joined: Apr 2003
Posts: 1,324 Western Pa
joewhite440
pro stock
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pro stock
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Western Pa
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Quote:
Quote:
3.55, especially if going with a tire taller that 26"
My 440 car with 28" tires has a 3:54 My 340/727 with 26" tire has a 3:55
I think they are perfect for the street and I can tell the difference between 26-28" tires.
I drive my 340 car with 26" tires on the highway all the time. It tachs about 5000 rpm at 120 mph with 3:55 and 26" tires. speedo says 135 but the GPS said 120mph at 4900+ rpms
Best ratio for street use. That is why they are hard to find used. If you were going to also race the car. I would have said 3:91's and they are even harder to find used.
Good luck and glad you are "back in the game"
Joe Sr
i
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Re: 3.23 or 3.55 behind 71 340 727 Auto???
[Re: JoesMopar]
#781930
08/24/10 11:55 AM
08/24/10 11:55 AM
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Joined: Apr 2003
Posts: 915 near New Haven, CT
fireeng
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Thanks for the input. I am going to try the 3.55s and see how it goes.
2016 Diesel Ram 3500 Mason Dump 1971 Challenger 2013 Jeep Wrangler 1979 Dodge Ram Power Wagon 400 Mini Pumper My other car is a Fire Truck.
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Re: 3.23 or 3.55 behind 71 340 727 Auto???
[Re: 68bb]
#781932
08/25/10 10:39 PM
08/25/10 10:39 PM
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Joined: Jan 2003
Posts: 5,791 Hamilton, Ontario Canada
Magnum
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Hamilton, Ontario Canada
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Have you considered an overdrive? Any choice you make will always be a compromise. A highway gear is high 2's and a drag gear is 4 something.
If it's a restoration or if you don't mind spinning the engine high or enjoy driving in the right lane with everything passing you, disregard.
69 Super Bee, 93 Mustang LX, 04 Allure Super
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Re: 3.23 or 3.55 behind 71 340 727 Auto???
[Re: fireeng]
#781933
08/25/10 10:48 PM
08/25/10 10:48 PM
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Joined: Jan 2003
Posts: 5,444 Indiana
YO7_A66
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master
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Indiana
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I have ran both 3:55/26" tires and 3:91/27" tires and I like them both with my 340/727 Challenger. I don't usually run 70+ (except WOT runs) but up to 70mph cruising speed is fine with either of these combos.
1970 YO7 A66 [Canadian Export] F8 Challenger 340 (Currently in shop for stroker assy.)
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