Re: What converter and gear?
[Re: Cab_Burge]
#2041050
03/29/16 10:39 AM
03/29/16 10:39 AM
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Joined: Jan 2003
Posts: 13,375 Marion, South Carolina [><]
an8sec70cuda
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I Live Here
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Posts: 13,375
Marion, South Carolina [><]
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A 4.10 gear ought to be about right. Converters are one of those parts where you definitely get what you pay for. I'd give Ultimate Converter Concepts a call.
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: What converter and gear?
[Re: spurman]
#2041144
03/29/16 01:07 PM
03/29/16 01:07 PM
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Joined: Jan 2003
Posts: 17,918 Akron, Ohio
ProSport
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I Live Here
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Akron, Ohio
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What size is your rear tire Spurman? Driving to the track or trailering?
1970 Challenger, all aluminum 528 Hemi, HDK suspension, Tremec 5 speed manual
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Re: What converter and gear?
[Re: spurman]
#2041193
03/29/16 02:34 PM
03/29/16 02:34 PM
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Joined: Jan 2003
Posts: 17,918 Akron, Ohio
ProSport
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I Live Here
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Akron, Ohio
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With that small of a back tire and a fairly stock motor I think I'd run a 3.73 gear, maybe a 3.91.
And traction could be an issue with an 8" converter but it'd sure be fun!
1970 Challenger, all aluminum 528 Hemi, HDK suspension, Tremec 5 speed manual
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Re: What converter and gear?
[Re: spurman]
#2041276
03/29/16 05:15 PM
03/29/16 05:15 PM
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Joined: Aug 2003
Posts: 43,232 Bend,OR USA
Cab_Burge
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I Win
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Posts: 43,232
Bend,OR USA
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Last edited by Cab_Burge; 03/29/16 05:25 PM.
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: What converter and gear?
[Re: spurman]
#2041703
03/30/16 03:19 AM
03/30/16 03:19 AM
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Joined: Jun 2003
Posts: 52,972 Romeo MI
MR_P_BODY
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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What rear suspension are you running.. your chassis set up will make a lot of difference... do you have 5" of travel in the front
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Re: What converter and gear?
[Re: spurman]
#2041731
03/30/16 08:15 AM
03/30/16 08:15 AM
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Joined: Feb 2004
Posts: 3,934 Nova Scotia Canada B2Y 1E4
SANDYinNS Canada
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master
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Posts: 3,934
Nova Scotia Canada B2Y 1E4
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9.5 are great converters... With that much motor/torque, it is going to stall the converter higher that say a std 440 therefore the tightest converter is probably going to stall at least 3500 ...there are only so many combinations of pumps and stators
Sandy in Nova Scotia formerly drdodge340 68 coronet wagon, 68 formula s 340 fb barracuda-69 super bee-72 aussie charger-72 aussie vh dodge ute -76 feather duster-76 duster-77 street van - 98 ram 1500 SS/T-99 ram 1500-13 ram red express truck- 2015 hellcat challenger
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Re: What converter and gear?
[Re: spurman]
#2042077
03/30/16 05:02 PM
03/30/16 05:02 PM
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Joined: Aug 2003
Posts: 43,232 Bend,OR USA
Cab_Burge
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I Win
Joined: Aug 2003
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Bend,OR USA
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The 4.10 should be okay at that elevation and on the 1/4 mile track, the 4.30 might be a tiny bit quicker in the 1/8 mile but they may limit you at a lower elevatiion 1/4 mile track. It use to be consider normal to have the motor run out of steam, reach peak HP RPM, between 1100 and 1200 ft at a 1/4 mile track on a all out drag race combination I've done that, it gets old real quick when the car quits pulling the last 200 to 300 ft at the track I made my old NHRA A/SA M.W. stocker quicker in the 60 ft, 330, 660 and 1/4 mile by adding a low gear set (2.77 verus the stock 2.45 1st gear ratio) and changing the rear gear ratio from a set of 4.89 to a set of 4.56 Some other racers with the same combination tried that and spun the tires, I guess my car worked better than thiers did on the starting line
Last edited by Cab_Burge; 03/30/16 05:03 PM.
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: What converter and gear?
[Re: spurman]
#2042289
03/30/16 10:46 PM
03/30/16 10:46 PM
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Joined: Jan 2003
Posts: 17,918 Akron, Ohio
ProSport
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I Live Here
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I don't have much experience with racing at 5200 feet but I'm thinking a 26" tire with a 4.10 is gonna put him through the traps at around 6400 RPM, I was basing that on 118MPH as I really don't know what his combo will run for MPH. Seems like that RPM is slightly high for that combo but I might be wrong if the altitude brings the RPM down some.
1970 Challenger, all aluminum 528 Hemi, HDK suspension, Tremec 5 speed manual
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