Rearend gear selection help needed.
#2413734
12/05/17 07:00 PM
12/05/17 07:00 PM
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Joined: May 2009
Posts: 836 Missouri
galen
OP
super stock
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OP
super stock
Joined: May 2009
Posts: 836
Missouri
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This is mainly a cruise night type car that will be making a few 100 plus mile trips for shows, etc. 68 Plymouth Satellite. Engine is a 588, Koleno block, 572-13 heads. Peak torque 817 at 6200. Redline 7000rpm. Tires are M&H 325/45/17 drag radials 28" diam. I am a paraplegic and drive with hand throttle and brake. In turn I opted for a fully programmable TCI 6X with upgrades. Gear ratios are 2.97,2.23,1.57,1.18,1.00,0.75. 3600 stall. I am leaning toward a 3.73 in a Strange S60. I want acceleration more than top end. It is a heavy all steel car, AC etc. I value your opinions. Thanks, Galen
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Re: Rearend gear selection help needed.
[Re: galen]
#2413739
12/05/17 07:09 PM
12/05/17 07:09 PM
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Joined: Jan 2003
Posts: 3,842 N.E. Ohio
6bblFLASH
master
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master
Joined: Jan 2003
Posts: 3,842
N.E. Ohio
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Even a 3.54 would be plenty,Thats a healthy engine!!
70` Cuda`,440 6BBL Jerico,Dana 4.56 Still on 93 Pump Gas 9.87 @ 136/1.31-60ft.`09 Mopar Nationals PASSON PERFORMANCE "Stick-Shift" Champ! 2013 StickShift Challenge Winner@ Mopar Nationals!
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Re: Rearend gear selection help needed.
[Re: 6bblFLASH]
#2413751
12/05/17 07:21 PM
12/05/17 07:21 PM
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Joined: Dec 2004
Posts: 10,556 Rittman Ohio
fourgearsavoy
I Live Here
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I Live Here
Joined: Dec 2004
Posts: 10,556
Rittman Ohio
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Yeah with that 2.97 first gear a 3.54 will be plenty. I had a 3.27 low gear in my Richmond and 3.54 gears in the rear and it came out of the hole quite nicely Gus
Last edited by fourgearsavoy; 12/05/17 07:21 PM.
64 Plymouth Savoy 493 Indy EZ's by Nick at Compu-Flow 5-Speed Richmond faceplate Liberty box Dana 60
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Re: Rearend gear selection help needed.
[Re: fourgearsavoy]
#2413752
12/05/17 07:22 PM
12/05/17 07:22 PM
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Joined: Jan 2003
Posts: 13,385 Marion, South Carolina [><]
an8sec70cuda
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 13,385
Marion, South Carolina [><]
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With that first gear ratio and a 28" tall tire, I'd go w/ 3.54s.
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
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Re: Rearend gear selection help needed.
[Re: galen]
#2413840
12/05/17 09:44 PM
12/05/17 09:44 PM
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Joined: Dec 2005
Posts: 11,668 Fulton County, PA
CMcAllister
Mr. Helpful
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Mr. Helpful
Joined: Dec 2005
Posts: 11,668
Fulton County, PA
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3.73 or even a 3.54 with those gear ratios? It's going to be a tire baking machine. Honestly, if you could eliminate using the 2.97 and just use 2.23 as low gear, it would work much nicer I think. Then maybe the 3.73 is manageable. 3.73x2.23=8.32 And with the overdrive, it will be OK on the highway.
If the results don't match the theory, change the theory.
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Re: Rearend gear selection help needed.
[Re: galen]
#2414162
12/06/17 01:29 PM
12/06/17 01:29 PM
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Joined: Jan 2003
Posts: 13,385 Marion, South Carolina [><]
an8sec70cuda
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 13,385
Marion, South Carolina [><]
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dvw...I agree that even a 3.54 w/ his 1st gear is too much SLR for his motor, but (as you know) the 3.54 is the lowest numerically commonly available gearset for the Dana. If he could find a taller gear, not sure what Strange has for them, that'd definitely be better. The car is set up more like a street cruiser even though it has a serious motor, so the 3.54 will likely be fine for him. It'll be like driving on ice from a dig though w/ that SLR and 17" drag radials on the street.
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
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Re: Rearend gear selection help needed.
[Re: galen]
#2414612
12/07/17 11:31 AM
12/07/17 11:31 AM
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Joined: Jan 2003
Posts: 13,385 Marion, South Carolina [><]
an8sec70cuda
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 13,385
Marion, South Carolina [><]
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Pros and cons both ways on the tires. The drag radials drive a lot better, but won't hook nearly as good on the street as a bias ply tire. If you're concerned w/ traction, go w/ a bias ply tire but use a sticky one...like the Hoosier Quicktime Pro or M/T ET Street. Don't waste your time w/ a M/T sportsman or the normal quicktime tire. They are bias ply, but will handle like one AND not hook worth a damn.
If traction is your main concern, stick w/ a 15" rim.
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
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Re: Rearend gear selection help needed.
[Re: galen]
#2414641
12/07/17 12:39 PM
12/07/17 12:39 PM
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Joined: Oct 2007
Posts: 4,210 New York
polyspheric
master
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master
Joined: Oct 2007
Posts: 4,210
New York
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What does your converter manufacturer say is your minimum cruise RPM for acceptable converter slip?
Boffin Emeritus
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