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#1
03-28-2016, 03:44 PM
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Rear Gear with 32 inch Tires
What Rear End Gears are you people running with 32 inch Tall Slicks? I'm leaning toward 4:11.This is for the Quarter Mile not Eighth. This is for a Back-Halved 72 Ventura with a Stroker 400 (455) and a Trans-Brake Powerglide.
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#2
03-28-2016, 03:50 PM
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i currently have 3.89s and i am crossing the line pretty low, ie 6600 or so. i am going to a 14x32ish slick which should help. I currently have MT 15x33s. they have about 2 weekends left in them, and then i think i too am going to install 4.11s. combinations will vary, mine is a about 830hp 535.
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#3
03-28-2016, 03:57 PM
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4:11 here, cross line about 6200-6300 at about 132
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#4
03-28-2016, 04:04 PM
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I originally had 3.89 gears naturally aspirated, but I switched to 3.50 gears when I supercharged to keep trap RPM under 8,000 with the higher speeds.
I run 32 X 14 slicks and a Powerglide. By my calculations, I have a lot of torque converter slippage at the big end (very loose converter). Jim
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****'63 Tempest, 475" IAII, Wenzler Super Chief heads, converted to blown alcohol, Birdcatcher, Littlefield 10-71 high helix. Best pass to date: 7.67 @ 181.59 (1/4 mi.), 4.95 @ 143.67 (1/8 mi.), 1.18 (60 ft) 7.75 @ 178 pass: https://www.youtube.com/watch?v=Iez3...ature=youtu.be First seven second pass(7.98): https://wwwoutube.com/watch?v=DK17...ature=youtu.be Thanks to Paul Carter @ Koerner Racing Engines 
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#5
03-28-2016, 04:45 PM
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I'm convinced the weight of the car also determines what RPM it crosses at....2920lbs 32-14.5 825hp 4.11 crossed at. 6900rpm.....changed to a 4.30 and it crossed at 7200RPM
Now I'm at 2800lbs & 1000+hp 4.30 gear and a 32-14.5 tire and I'm hoping to cross at 7400ish might change to a 33 tall tire
__________________
"You have to evaluate the past,Focus on the future,and that tells you what you have to do in the present"--Lou Holtz “It’s the process it takes to get to goals that sets us apart, the execution on every single play, one play,one life” Notre Dame Head Coach Marcus Freeman 69 GTO NHRA Super Street Car 2860lbs 10.82@159.91 in Joliet May 2024 ….157.56 MPH in Gainesville in March ‘23 |
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#6
03-28-2016, 07:33 PM
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I would run a 4.33 with that size tire. I guess it depends on the mph/rpm you are wanting to run. I go through the traps at 7000 with a 31" (96" rollout) slick with a 4.11 and a glide at 143 mph.
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Come take a ride http://www.youtube.com/watch?v=P7Y8Awfk2I0 2008, 2013, 2015, 2016, 2019 Central Il Dragway Mod track champion and 2015 IHRA Div 5 Mod champion 
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#7
03-28-2016, 07:44 PM
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Quote:
__________________
"You have to evaluate the past,Focus on the future,and that tells you what you have to do in the present"--Lou Holtz “It’s the process it takes to get to goals that sets us apart, the execution on every single play, one play,one life” Notre Dame Head Coach Marcus Freeman 69 GTO NHRA Super Street Car 2860lbs 10.82@159.91 in Joliet May 2024 ….157.56 MPH in Gainesville in March ‘23 |
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#8
03-28-2016, 08:21 PM
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I have 33x16 Hosiers on my 63 Tempest in Super Street with 4:88s. I'll know after this weekend what I cross at. I'm thinking 7400 at 143.
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1965 TriPower GTO, 1967 GTO, 1969 GTO, 1969 Judge, 1972 GTO, 1977 Smokey and the Bandit, 1989 TA ProStreet, 1968 Firebird NHRA 10.90 racecar, 1963 Tempest S/Gas |
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#9
03-28-2016, 09:13 PM
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I was running 4.10 in my 63 with 33 tall tire. Switched to 4.30, but haven't ran yet.
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65 Lemans Street Car - 521, T400, 3.70 9". 10.13 @ 135. 3770 lbs. Drag Week ‘14, ‘15, ‘17 63 Lemans Race Car- 8.81 @ 151, 5.60 @ 123(SOLD) 67 Bonneville ragtop 74 Firebird - 455, e heads, TK0600 in process |
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#10
03-28-2016, 11:20 PM
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4.29 with my 14 X 32 on signature car.
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 ECM member. 2008 Outlaw Pontiac Drag Series Champion MANDRA Do it now fool! Life is short. 69 Grand Prix/3163lbs / IAII 535 w/ Tiger heads by Gaydosh....9.35@ 144 so far..  through mufflers. 1.26 60'. Going back to track with pump gas engine.... My 60 Ventura retired to street/strip duty.. |
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#11
03-29-2016, 01:07 AM
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Thanks for all the input, I think my original idea is in the ballpark as I don't want to scream it too high (not a small block chevy) the car has 4.86 in it now but that is too much gear for my engine I'm thinking.
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#12
03-29-2016, 01:12 AM
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That looks like where I want to be for RPM.I'm seeiing these Avatars of the 60 Pontiacs and thinking of my first car (60 Poncho),what a great car for the Drive Ins
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#13
03-29-2016, 06:28 PM
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I'm running a 15X33, 2900 pounds,4.11 and trap at 6700. Going to a 4.29 for more trap rpm
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#14
03-30-2016, 10:48 PM
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3450# 64 GTO 15x32 430 gear 7050 rpm @132 mph
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#15
03-30-2016, 11:23 PM
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Okay, my turn. 2750# 64 GTO 15x32.5 4.71 gear 82-8300rpm @164mph quarter mile.
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Bill 64 GTO, tube chassis w/606" IA tall deck, PG & a pro geared Fab 9". 2750 lbs. 8.2550@164.17-1/4, 5.2901@131.97-1/8, 1.1981-60-ft. 8/10/08 
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#16
04-02-2016, 12:23 PM
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Quote:
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1964 GTO 501, Edelbrock Heads NA, 3460 lbs. 9.76 @ 137mph 1971 Trans Am Lucy Blue, 11.56 @ 115 1966 LeMans. 462, SD prepped Kaufman D ports. 11.90 @ 112 1976 Trans Am twin turbo 462, SD Edelbrock heads 8.50@159 2009 G8 GT |
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#17
04-02-2016, 12:28 PM
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Old stats in my sig. Running 9.95 @ 132 now. Same weight.
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1964 GTO 501, Edelbrock Heads NA, 3460 lbs. 9.76 @ 137mph 1971 Trans Am Lucy Blue, 11.56 @ 115 1966 LeMans. 462, SD prepped Kaufman D ports. 11.90 @ 112 1976 Trans Am twin turbo 462, SD Edelbrock heads 8.50@159 2009 G8 GT |
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#18
04-09-2016, 09:24 PM
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never checked it i have a conan 5500 stall. I wonder if the tach could be off.
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