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#1
06-22-2015, 09:44 PM
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Gears
Wondering if I made the right choice picking 3.25 gears for my combo. Engine is a 461 with e heads ported to flow around 300 cfm performer rpm intake comp cam hr288xr roller cam with a th400 with a continental 10 inch 3000 stall and a kens speed and custom d1sc procharger.
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#2
06-22-2015, 09:53 PM
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Plenty of gear for a supercharged 461, you could have easily gone taller (lower numerically).
You made a good choice.
__________________
1964 Tempest Coupe LS3/4L70E/3.42 1964 Le Mans Convertible 421 HO/TH350/3.08 2002 WS6 Convertible LS1/4L60E/3.23 1966 VW Type 2 Single Cab Pickup 140hp 2276 1956 VW Type 2 Panel Van 36hp 1200 1957 VW Type 1 Beetle 180hp 2276 |
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#3
06-22-2015, 09:57 PM
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I've got a set of 3.70 for my 9 inch but was thinking it was to much. When I had 8.2 with 3.55 I don't remember the car being much fun at 75 lol
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#4
06-22-2015, 11:16 PM
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I am finding that after talking with some of the Pontiac guys in the know, that most of the time the big gear thought [3.55-3.90-4.10] are not needed with todays technology.
I have 3.90's in my car now and have been told with my combo [Stump Puller cam] I can do with a set of 3.23/3.36 gears, don't need the tall ones any more.
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color me gone |
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#5
06-22-2015, 11:26 PM
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Lower numerical gears (2.56, 3.08, 3.23) = tall gears. Tall gears are highway gears.
Higher numerical gears (3.90, 4.10, 4.56) = short gears. Short gears are for drag racing and such. Pontiacs generally like taller gears than the typical Chevy might use for maximum acceleration, because of their superior mid-range torque characteristics. You can have a very quick Pontiac 455 street car with 3.08 gears. No need to gear it down to 3.90 or 4.11 like you would a 327 Chevy.
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1964 Tempest Coupe LS3/4L70E/3.42 1964 Le Mans Convertible 421 HO/TH350/3.08 2002 WS6 Convertible LS1/4L60E/3.23 1966 VW Type 2 Single Cab Pickup 140hp 2276 1956 VW Type 2 Panel Van 36hp 1200 1957 VW Type 1 Beetle 180hp 2276 |
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#6
06-23-2015, 08:04 AM
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you for got 3.55
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color me gone |
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#7
06-23-2015, 08:28 AM
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That gear ratio with the charger on top will be the best of both worlds!
__________________
Wernher Von Braun warned before his retirement from NASA back in 1972, that the next world war would be against the ETs! And he was not talking about 1/8 or 1/4 mile ETs! 1) 1940s 100% silver 4 cup tea server set. Two dry rotted 14 x 10 Micky Thompson slicks. 1) un-mailed in gift coupon from a 1972 box of corn flakes. Two pairs of brown leather flip flops, never seen more then 2 mph. Education is what your left with once you forget things! |
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#8
06-23-2015, 09:07 AM
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Not the best highway gear but great for city driving and drag strip performance. Your only problem will be getting enough tire in there to hook that thing up when you put the hammer down.
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Tim Corcoran |
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#9
06-23-2015, 10:10 AM
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I had 2:41's and changed to 3:42's. I made the mistake of changing gears before I was done getting my engine (a complete rebuild) completely tuned. I ended up changing to E-heads via Kauffman and I'm making so much power now that I could easily handle a taller gear. I wish that I had gone with 3.08's. As it is, I'm looking for an overdrive transmission and completely avoiding highway driving. It's great around town and my commute to work doesn't have anything more than 5 miles above 55mph speed limit. On the highway, it's just pulling to many RPMs to think about a trip much over 100 miles.
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#10
06-24-2015, 06:34 PM
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Quote:
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#11
06-24-2015, 06:43 PM
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I went with 3.73's behind my 462/Th400 combo. Revs are high for highway use, but I can cruise around town at 35-50 mph comfortably in 3rd and have all the power I need to zoom around things without needing a downshift.
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-Jason 1969 Pontiac Firebird |
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#12
06-24-2015, 08:07 PM
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gear choice is dependent on how YOU use your car....not someone else.....only one way to find out what you like..
__________________
71 GTO, 463, KRE 295 cfm heads ported by SD Performance, RPM intake, Qjet, Dougs Headers, Comp cams HR 246/252 ...11 to 1 , 3.55 cogs, 3985lbs.....day three- 11.04 at 120mph ....1.53 60', 6.98 1/8 mile |
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#13
06-24-2015, 08:21 PM
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Quote:
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Karl 
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#14
06-25-2015, 07:06 AM
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Quote:
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#15
06-25-2015, 09:19 AM
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It's gonna be mostly street use track from time to time. Just wanna be able to enjoy it.
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#16
06-25-2015, 10:05 AM
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I have had 2:56, 3:23, 3:42, 3:73 in various Pontiacs. 3:23 was my favorite.
I have a 3:08 rear that I would like to install in my firebird that I would like to try. |
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#17
06-25-2015, 05:22 PM
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I really like the 3.23s in my Formula even with a smaller engine than most of you guys are running (440 ci). Plenty of punch around town and a pleasure on the freeway and mid 12s at the track.
__________________
---------------------------- '72 Formula 400 Lucerne Blue, Blue Deluxe interior - My first car! '73 Firebird 350/4-speed Black on Black, mix & match. |
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#18
08-10-2015, 08:18 AM
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time runs
Quote:
Put 342s back in went [email protected] at Norwalk |
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#19
08-10-2015, 08:19 AM
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Lost a tick on 60 1.50 to 1.52
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#20
08-10-2015, 08:38 AM
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Love my 3.15s , they pull like 3.73s in my other cars.
__________________
 1970 amc rebel 4-door, faded blue paint,290 emblems on car, 455 under the hood.Turbo 400,3.15 gear.Best so far 1/8 et,8.90 on street tires, Since that I have added 400 heads. I call it a rat sleeper. |
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