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#1
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428 street strip gear
428 with 13 heads 60919 cam rhoads lifters 9.6 compression. 67 firebird 2500 Converter... thought about using a 3.90 gear...for street strip.... if a take or go back to 3.42 ill think i would runner slower maybe 0.3 to 0.4 s..... so what do guys think about 3.42 vers 3.90 gears on my combo
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#2
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I'd say the 3.90 would be more strip than street.
3.42's would make great street and some strip or even more strip.
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John Wallace - johnta1 Pontiac Power RULES !!! www.wallaceracing.com Winner of Top Class at Pontiac Nationals, 2004 Cordova Winner of Quick 16 At Ames 2004 Pontiac Tripower Nats KRE's MR-1 - 1st 5 second Pontiac block ever! "Every man has a right to his own opinion, but no man has a right to be wrong in his facts." "People demand freedom of speech to make up for the freedom of thought which they avoid." – Socrates |
#3
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3.55 or 3.73 works well with a 4" stroke.
I switched from 3.73 to 3.90 to 4.10 and noticed very little difference in ET. Roughly less than a .10 between the 3.
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66 GTO Nostalgia Super Stock/Street Legal Car 421 CID, stock block, Wenzler Intake, 2- Carter 750 AFB's, 3.90 Gears, Full Factory Interior, Full Exhaust, Stock Suspension 3750LBS 9.77@136.99 Multiple NSCA/NMCA World Champion 66 GTO 389 3x2, 4 speed, 4.33 gear, Montero Red 33K original Miles 67 GTO 2dr Post, 428, Tri Power, 3.55 Gears 80 Trans Am Black SE Y84 W72 WS6 |
The Following User Says Thank You to Mike Davis For This Useful Post: | ||
#4
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Three speed auto or four speed overdrive? 3.42 if turbo 400, 3.90 if you have an OD trans.
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#5
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Have a th400 ....
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#6
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Have a th400 ....
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#7
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3.90 is rather short for hyway speeds on the Street, stick with 3.42
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#8
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What Mike Davis said.
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#9
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Mike davis 3.73 to 4.10 results are interesting but maybe his converter stalls a lot higher than mine...so theres not so much difference
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#10
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Quote:
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63 Catalina coupe 467 cid budget drag car 11's 1/4 , 7.20 1/8th pump gas n/a 66 Star Chief Executive 57k mile 67 IH Scout project 2WD "Indian Scout" 69 Le Mans 2 dr HT 350 85k mile 15 sec 1/4 69 Firebird 400 Burgandy/Black 70 Olds Rallye 350 F85 4 speed 3.91's 70 Olds Cutlass Cruiser Red Wagon 350 101k miles 15 sec 1/4 12 sec w 455 74 Cheyenne Super C10 LWB Gen 6 454 w ZZ502 cam 3.07gear 13.1 1/4, 8.3 1/8 2020 RAM 1500 SLT 4x4 5.7 A8 Hemi 2007 Hummer H3 3.7 liter turd |
#11
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....i mean with my 2500 converter it should run a lot faster with 3.90 vers 3.55 but maybe im wrong..
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#12
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I have a 5200 Converter in my 66 with the 421.
When it was primarily a street car I had a 3500 in it and a 3.73 gear. Was a good combo for around town and short drives. With the cam shaft you are running I'd go 3.55 if you can. My 67 has a 428, #62 casting heads, 66 Tri Power, Ultradyne Cam similar to the 60919, TH400 with a 2700 Converter, 3.55 gears with a 27" tire. I like the way it cruises on the highway. I would not want much more than that.
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66 GTO Nostalgia Super Stock/Street Legal Car 421 CID, stock block, Wenzler Intake, 2- Carter 750 AFB's, 3.90 Gears, Full Factory Interior, Full Exhaust, Stock Suspension 3750LBS 9.77@136.99 Multiple NSCA/NMCA World Champion 66 GTO 389 3x2, 4 speed, 4.33 gear, Montero Red 33K original Miles 67 GTO 2dr Post, 428, Tri Power, 3.55 Gears 80 Trans Am Black SE Y84 W72 WS6 |
#13
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Guys thanks fot all your opinions an Mike thanks for your detailed info ..
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#14
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see 12.24 ET signture, only combo diff is the stroke.
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12.24/111.6MPH/1.76 60'/28"/3.54:1/SP-TH400/469 R96A/236-244-112LC/1050&TorkerI//3850Lbs//15MPG/89oct Sold 2003: 12.00/112MPH/1.61 60'/26"x3.31:1/10"/469 #48/245-255-110LSA/Q-Jet-Torker/3650Lbs//18MPG 94oct Sold 1994: 11.00/123MPH/1.50 60'/29.5"x4.10:1/10"/469 #48/245-255-110LSA/Dual600s-Wenzler/3250Lbs//94oct |
#15
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3.42
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#16
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3.42 good choice for street strip.....3.90 is too low..w/TH400. If your tire height is anything shorter than 28 you'll be hating life on the freeway with 3.90s, and even with 28s its not fun on the freeway with 3.90s
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#17
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Mike your 67 428 with 3.55 gear have you ever run on the track any quartermile results....?
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#18
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I have not run the 67 in a long time or with this combo. Just basically a cruiser now. It has been in the family since new.
The last time the car was ran, my Dad ran it in the 90's. Combo was 428 std bore, 068 cam, stock 670 heads, Ram Air Manifolds, 67 Q jet intake and carb, TH400, 3.55 gear. Car ran 12.70's.
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66 GTO Nostalgia Super Stock/Street Legal Car 421 CID, stock block, Wenzler Intake, 2- Carter 750 AFB's, 3.90 Gears, Full Factory Interior, Full Exhaust, Stock Suspension 3750LBS 9.77@136.99 Multiple NSCA/NMCA World Champion 66 GTO 389 3x2, 4 speed, 4.33 gear, Montero Red 33K original Miles 67 GTO 2dr Post, 428, Tri Power, 3.55 Gears 80 Trans Am Black SE Y84 W72 WS6 Last edited by Mike Davis; 01-21-2022 at 01:58 PM. |
#19
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Gear vendor would allow you to run more gear and cruise on the interstate.
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Be carefull of the feet you step on today.They may be attached to the a$$ you kiss tomorrow. |
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