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3.54 vs 3.73 performance difference #2648597
04/24/19 08:10 PM
04/24/19 08:10 PM
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clarks summit pa
73cuda340 Offline OP
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Has anybody done a comparison between 3.54 and 3.73 gears in the 1/4? I'm getting a new Dana 60 for my cuda but I'm unsure about which ratio to go with. Car is street/ strip but no highway driving, just around town and back roads. Car has 528 Hemi with a 4 speed and 295/55/15s.


1973 Cuda 528 all aluminum Hemi, 4 speed, 3.23 Sure-Grip, (JA5) Silver Frost Metallic 1973 Challenger Rallye 340 1985 W150 Power Ram prospector 1986 Camaro IROC-Z 305 tpi
Re: 3.54 vs 3.73 performance difference [Re: 73cuda340] #2648600
04/24/19 08:26 PM
04/24/19 08:26 PM
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Byron, NY
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not enough to notice on the street


'01 P1500, Blown/Inj BAE,/Veney ,Bruno/CS2,Dana 60
'01 Dodge 3500 S Cummins Auto, Fresh air kit, 4" Exhaust,
'05 Dodge Magnum R/T - Too Much to list
'60 Willys CJ5
'01 International LPX - Project,DT466, Allison
'64 Plymouth Valiant, Inj 528 Hemi, 2spd
Re: 3.54 vs 3.73 performance difference [Re: 73cuda340] #2648648
04/24/19 10:18 PM
04/24/19 10:18 PM
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Bend,OR USA
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If it was me I would buy the 3:73 for the stick tranny, 3:54 for a 727 up
is your tranny a NP833 standard ratio, non O.D.,or which tranny are you using and what is the first gear ratio?


Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
Re: 3.54 vs 3.73 performance difference [Re: Cab_Burge] #2648699
04/25/19 08:06 AM
04/25/19 08:06 AM
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Marion, South Carolina [><]
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iagree Not enough to notice. I'd probably go with the 3.73 though. twocents


CHIP
'70 hemicuda, 575" Hemi, 727, Dana 60
'69 road runner, 440-6, 18 spline 4 speed, Dana 60
'71 Demon, 340, low gear 904, 8.75
'73 Chrysler New Yorker, 440, 727, 8.75
'90 Chevy 454SS Silverado, 476" BBC, TH400, 14 bolt
'06 GMC 2500HD LBZ Duramax
Re: 3.54 vs 3.73 performance difference [Re: 73cuda340] #2648709
04/25/19 08:19 AM
04/25/19 08:19 AM
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Benton, IL.
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DaveRS23 Offline
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iagree Not much difference. On a street car, I would be more interested in whether one set would be quieter than the other. Lots and lots of noisy gear sets out there nowadays. Dr. Diff is the go-to guy on these matters. Here is a good calculator for you:

http://www.wallaceracing.com/calc-gear-tire-rpm-mph.php


Master, again and still
Re: 3.54 vs 3.73 performance difference [Re: 73cuda340] #2648743
04/25/19 10:06 AM
04/25/19 10:06 AM
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So. Burlington, Vt.
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No highway use, street/strip........

If the ET is a factor in deciding on which gears, I’d probably go 4.10’s with a stick.


68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123
Dealer for Comp Cams/Indy Heads
Re: 3.54 vs 3.73 performance difference [Re: fast68plymouth] #2648791
04/25/19 11:31 AM
04/25/19 11:31 AM
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TN
1DGEMAN Offline
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Since you are just putting around back roads and no freeway driving put the gears in it that work the best for the strip. At least 4.10's


Real Men shift for themselves
Re: 3.54 vs 3.73 performance difference [Re: 73cuda340] #2648823
04/25/19 12:21 PM
04/25/19 12:21 PM
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central il.
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second 70 Offline
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I changed from a 3:54 to 4:10 on my hemi cuda and it only raised the rpm at 70mph 500. It's a 426 4speed and has 28" tall tires. It is a lot more fun to drive now.

Re: 3.54 vs 3.73 performance difference [Re: second 70] #2648827
04/25/19 12:25 PM
04/25/19 12:25 PM
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clarks summit pa
73cuda340 Offline OP
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My car has a 71 18 spline hemi 4 speed which should be a 2.44 first gear.


1973 Cuda 528 all aluminum Hemi, 4 speed, 3.23 Sure-Grip, (JA5) Silver Frost Metallic 1973 Challenger Rallye 340 1985 W150 Power Ram prospector 1986 Camaro IROC-Z 305 tpi
Re: 3.54 vs 3.73 performance difference [Re: 73cuda340] #2648842
04/25/19 12:50 PM
04/25/19 12:50 PM
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I thought all the 18 spline hemi tranny had either the 2.65(red stripe?) or 2.66 (blue stripe?)first gear ratio, no close ratio like in the 1970 23 spline AAR and T/A and in the 1971 and later 23 spline tranny in production vehicles confused


Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
Re: 3.54 vs 3.73 performance difference [Re: 73cuda340] #2648843
04/25/19 12:51 PM
04/25/19 12:51 PM
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Graz, Austria
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Originally Posted by 73cuda340
My car has a 71 18 spline hemi 4 speed which should be a 2.44 first gear.


I would go with the 3.73 then. Starting line ratio is about 9.1 vs. 8.6 with the 3.54 gears.

Re: 3.54 vs 3.73 performance difference [Re: 73cuda340] #2649005
04/25/19 08:29 PM
04/25/19 08:29 PM
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Prospect, PA
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Originally Posted by 73cuda340
Has anybody done a comparison between 3.54 and 3.73 gears in the 1/4? .........Car has 528 Hemi with a 4 speed and 295/55/15s.


No, I have not done a comparison. In your question above, will the car have street tires, or slicks?

Generally, from my experience, traction limited cars (i.e. street tires at the track) usually show little change in ET because the benefit of the higher gear is lost in the lack of improvement in 60 ft due to the traction limitation of the tire.

But if the car will never be on the highway, why would you not go with the higher gear ratio. It will be more fun to drive.

Re: 3.54 vs 3.73 performance difference [Re: Cab_Burge] #2649571
04/27/19 03:41 PM
04/27/19 03:41 PM
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clarks summit pa
73cuda340 Offline OP
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Originally Posted by Cab_Burge
I thought all the 18 spline hemi tranny had either the 2.65(red stripe?) or 2.66 (blue stripe?)first gear ratio, no close ratio like in the 1970 23 spline AAR and T/A and in the 1971 and later 23 spline tranny in production vehicles confused


I could be wrong, but I read that 70 and earlier hemi 4 speeds had the 2.65 and the 71 had the other.


1973 Cuda 528 all aluminum Hemi, 4 speed, 3.23 Sure-Grip, (JA5) Silver Frost Metallic 1973 Challenger Rallye 340 1985 W150 Power Ram prospector 1986 Camaro IROC-Z 305 tpi
Re: 3.54 vs 3.73 performance difference [Re: 73cuda340] #2649669
04/27/19 09:09 PM
04/27/19 09:09 PM
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Of them 2 selections with a 528 Hemi I would go with the 3.73's. Good luck , Ron

Re: 3.54 vs 3.73 performance difference [Re: BSB67] #2649811
04/28/19 10:21 AM
04/28/19 10:21 AM
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clarks summit pa
73cuda340 Offline OP
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Originally Posted by BSB67
Originally Posted by 73cuda340
Has anybody done a comparison between 3.54 and 3.73 gears in the 1/4? .........Car has 528 Hemi with a 4 speed and 295/55/15s.


No, I have not done a comparison. In your question above, will the car have street tires, or slicks?

Generally, from my experience, traction limited cars (i.e. street tires at the track) usually show little change in ET because the benefit of the higher gear is lost in the lack of improvement in 60 ft due to the traction limitation of the tire.

But if the car will never be on the highway, why would you not go with the higher gear ratio. It will be more fun to drive.


The car has drag radials on it.


1973 Cuda 528 all aluminum Hemi, 4 speed, 3.23 Sure-Grip, (JA5) Silver Frost Metallic 1973 Challenger Rallye 340 1985 W150 Power Ram prospector 1986 Camaro IROC-Z 305 tpi
Re: 3.54 vs 3.73 performance difference [Re: 73cuda340] #2649878
04/28/19 01:06 PM
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Originally Posted by 73cuda340
Originally Posted by Cab_Burge
I thought all the 18 spline hemi tranny had either the 2.65(red stripe?) or 2.66 (blue stripe?)first gear ratio, no close ratio like in the 1970 23 spline AAR and T/A and in the 1971 and later 23 spline tranny in production vehicles confused


I could be wrong, but I read that 70 and earlier hemi 4 speeds had the 2.65 and the 71 had the other.

Mopar added the close ratio to the 23 spline trannys in 1970 on the AAR and T/A cars, they then drop the 2.66,265, ratio in the 23 spline tranny only (is what I'm under the impression) and put the close ratio trannys in all the 1971 4 speed cars except the Hemi and 440 HP cars confused
I've never had a 1971 hemi or 440 18 spline tranny to check the first gear ratio, maybe some one here who has one can chime in work

Last edited by Cab_Burge; 04/28/19 01:08 PM.

Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
Re: 3.54 vs 3.73 performance difference [Re: 73cuda340] #2649882
04/28/19 01:14 PM
04/28/19 01:14 PM
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Originally Posted by 73cuda340
Has anybody done a comparison between 3.54 and 3.73 gears in the 1/4? I'm getting a new Dana 60 for my cuda but I'm unsure about which ratio to go with. Car is street/ strip but no highway driving, just around town and back roads. Car has 528 Hemi with a 4 speed and 295/55/15s.


Welcome to the slippery slope! I originally just wanted a good 4-barrel on my 383 Satellite..... haha.


LemonWedge - Street heavy / Strip ready - 11.07 @ 120
Re: 3.54 vs 3.73 performance difference [Re: StealthWedge67] #2649980
04/28/19 07:26 PM
04/28/19 07:26 PM
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clarks summit pa
73cuda340 Offline OP
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1973 Cuda 528 all aluminum Hemi, 4 speed, 3.23 Sure-Grip, (JA5) Silver Frost Metallic 1973 Challenger Rallye 340 1985 W150 Power Ram prospector 1986 Camaro IROC-Z 305 tpi
Re: 3.54 vs 3.73 performance difference [Re: 73cuda340] #2650043
04/28/19 10:43 PM
04/28/19 10:43 PM
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Originally Posted by 73cuda340
http://www.brewersperformance.com/history.php



https://www.allpar.com/mopar/transmissions/four-speed-manual.html

Here's the two sources where it lists the 2.44 first gear ratio for 1971.

Those are the first and only things I've seen in writing about the 18 spline 1st gear ratio being change for 1971 bow blush

Last edited by Cab_Burge; 04/28/19 10:43 PM.

Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
Re: 3.54 vs 3.73 performance difference [Re: Cab_Burge] #2650246
04/29/19 03:17 PM
04/29/19 03:17 PM
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Gilroy,CA.
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This leads me to a question, I currently have 3.73s in a Dana 60, would the jump to 4.10s be substantial? Currently have an OD trans.


408 Stroker 533 HP 520 FT LBS...........................1970 Dart RMS AlterKation
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