Pontiac - Street No question too basic here!

          
View Poll Results: Wide or close ratio TKX and gear options *street car*
Wide ratio w/ 3.08 gear 6 20.69%
Wide ratio w/ 3.36 gear 10 34.48%
Close ratio w/ 3.55 gear 6 20.69%
Close ratio w/ 3.73 gear 7 24.14%
Voters: 29. You may not vote on this poll

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  #1  
Old 11-01-2024, 03:41 PM
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scott70 scott70 is offline
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Originally Posted by jhein View Post
Obviously, that's the set up that I have. I think it's near perfect. It's like having a M20 with a 3.77 rear gear in first and 2.68 rear gear in 4th. I think you're gonna love it.
Actually got a email today… dennys driveshaft shipped today. Sounds like a good combination for the OP.

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72 lemans,455 e-head, UD 255/263 solid flat,3.73 gears,,,10" 4400 converter,, 6.68 at 101.8 mph,,1.44 60 ft.2007
(cam 271/278 roller)9"CC.4.11gear 6.41 at 106.32 mph 1.42 60 ft.(2009) SOLD,SOLD
1970 GTO 455 4 speed #matching,, 3.31 posi.Stock manifolds. # 64 heads.A factory mint tuquoise ,69' judge stripe car. 8.45 @ 88.1 mph on slippery street tires.Bad 2.19 60ft.Owned since 86'
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Old 11-01-2024, 10:41 PM
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jhein jhein is offline
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Originally Posted by scott70 View Post
Actually got a email today… dennys driveshaft shipped today. Sounds like a good combination for the OP.
Yeah I thought about that too. I was just wondering about the fact that the OPs motor is a stockish 400. So I thought that may tolerate a 2.87 1st gear with a 3.73 rear a little better.

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70 TA, 467 cid IAII, Edelbrock D-port heads, 9.94:1, Butler HR 236/242 @ .050, 520/540 lift, 112 LSA, Q-jet, TKX (2.87 1st/.81 OD), 3.31 rear

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  #3  
Old 11-02-2024, 10:50 AM
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Originally Posted by jhein View Post
Yeah I thought about that too. I was just wondering about the fact that the OPs motor is a stockish 400. So I thought that may tolerate a 2.87 1st gear with a 3.73 rear a little better.
The OP has been driving his GTO with a 2.52 first gear and a 2.93 rear gear (effective 7.4 ratio).

I think a 2.87 first gear alone would be more than 'tolerable', even with the current 2.93 rear (8.4 effective ratio - a 12% improvement).

Going to a 3.73 rear would take a major change in his driving habits to avoid doing burnouts from every stop sign/stop light.

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