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  1. #1
    Join Date
    Oct 2012
    Posts
    7

    Default Proper GEARS needed!

    Hello Everyone, I have a 1964 Buick Riviera (401) with some upgrades. I recently had a cam (w/ new springs, lifters), and a TA 25 torque converter installed. I am considering, putting new gears in, but not sure what ratio would be a good match for my set up without hacking or tampering with the rear end too much. I would like a more responsive launch off the line because right now it does not have any low end at all. Any advice or help would be greatly appreciated! Thank you for your time.

  2. #2
    Join Date
    Apr 2009
    Location
    Hoboken, NJ
    Posts
    123

    Default Re: Proper GEARS needed!

    You are going to get 100 responses here and the best advice I can give you is to call JEGS and speak to a tech, It will take 5 minutes and they will ask you what you have now and what you are looking to get out of your car and give you the best options that match exactly what setup you have

  3. #3
    Join Date
    Oct 2012
    Posts
    7

    Default Re: Proper GEARS needed!

    No aftermarket parts available from JEGS for full sized buick rear ends.

  4. #4
    Join Date
    Feb 2002
    Location
    North Carolina
    Posts
    26,492

    Default Re: Proper GEARS needed!

    JEGS has no tech that knows squat about this.

    You will have to post in Parts Wanted for a used set of gears. At this time no one makes Buick 9 3/8s.
    Jim Lore
    BPG 1037
    "If you cannot clear up the confusion at least make the confusion clear."

  5. #5
    Join Date
    Mar 2004
    Location
    Edmonton Alberta
    Posts
    15,373

    Default Re: Proper GEARS needed!

    Contact Jim he can set you up with the right parts:

    http://www.v8buick.com/member.php?3880-monzaz
    __________________________________________________ __________________________________
    My book called Small Block Buick Performance covering the V6, 215, 300, 340, and Buick 350 engines will be released soon.

    http://www.v8buick.com/forumdisplay....rformance-Book
    __________________________________________________ ____________________________
    1970 Buick Skylark Turbo 350 street/strip

  6. #6
    Join Date
    May 2010
    Location
    Southwest Ohio
    Posts
    5,068

    Default Re: Proper GEARS needed!

    Quote Originally Posted by sean Buick 76 View Post
    Contact Jim he can set you up with the right parts:

    http://www.v8buick.com/member.php?3880-monzaz
    This^^^

    If anybody can hook you up, Jim (Monzaz) can.
    Shawn
    "I drive too fast to worry about my cholesterol..."
    -72 Skylark- Project "Rusty Hulk"- 462ci 4 speed street bruiser
    Build Thread: http://www.v8buick.com/showthread.php?293656-Build-Thread-Project-Rusty-Hulk
    -72 Skylark- The wifes ride, " Elsa " - bone stock and classy cruiser
    BPG #2288 (RIP)
    BCA Member #???? (For Now)

    "The garage looks like the house of
    Dr. Jeckyl and Mr. Hyde..."






  7. Default Re: Proper GEARS needed!

    I have a 3.42 Riviera differential for sale. Going @ $650.
    Plus shipping from Cincinnati to wherever you are
    Deceptively Proficient.

    Ted Nagel
    64 LeSabre Wagon
    65 Wildcat 4-speed
    65 Gran Sport 4-speed
    67 Wildcat
    68 GS 400
    69 GS Stage 1 4-speed
    70 GS Stage 1 4-speed

  8. #8
    Join Date
    Feb 2002
    Location
    Scottsdale AZ
    Posts
    515

    Default Re: Proper GEARS needed!

    One of the easiest things you could do to help your dead stop acceleration would be to have a 2.75:1 first gear set installed into your T400 trans. Not sure who sells this gear set today but it will make a difference. 3.00:1 are even better but I'm not sure if anyone is still making them.
    Mike Tomaszewski
    TA Performance Products Inc.
    www.taperformance.com
    480-922-6807

  9. #9
    Join Date
    Dec 2002
    Location
    Bucks County, Pa
    Posts
    6,576

    Default Re: Proper GEARS needed!

    A bigger cam will reduce low end power, but increase top-end power. That's just how it is.

    Your '64 trans doesn't have the switch-pitch converter, so a higher stall one will get the engine more into the power band.

    Modifying the distributor for a quicker mechanical advance as well as more initial advance will likely boost off the line performance, I'd suggest starting there. Either find a 2x4 or a Dynaflow distributor or have yours modified.

    Shorter rear tires will have the same effect as increasing the gears. What size tires do you have?
    Walt K
    (1)'66 GS Astro Blue, 13.41 et (2)'66 GS Saddle Mist, L76 Q-jet option, 1 of 132 (3)'66 GS Flame Red, Calif car (4)'66 GS Silver Mist, 4 speed (5)'66 Special, Flame Red, 300 (6)'79 Turbo Regal, 14.1 et (7)'65 GS 4 speed 'vert

  10. #10
    Join Date
    Feb 2002
    Location
    North Carolina
    Posts
    26,492

    Default Re: Proper GEARS needed!

    http://www.kilgoretrans.com/html/gearsets.html

    John Kilgore racing for the TH400 3 to 1 gear ratio.
    Jim Lore
    BPG 1037
    "If you cannot clear up the confusion at least make the confusion clear."

  11. #11
    Join Date
    Apr 2002
    Location
    Worcester, MA
    Posts
    3,047

    Default Re: Proper GEARS needed!

    I've used a 2.75 gearset for decades, it worked great with my 2.56 rearend and switch-pitch.

    I used to have a 3.00:1 gearset, however I managed to break that. Most people will probably not have the same problem I did - I was using a pretty big nitrous shot on top of an already healthy 455. I have beat the crap out of the 2.75 gearset, and never had any issues.

    There is a noticable difference in "stoplight response" when using the 3.00 gearset, for sure. The difference is also there with 2.75:1, although obviously not quite the same.

    -Bob C.

  12. #12
    Join Date
    Oct 2012
    Posts
    7

    Thumbs up Re: Proper GEARS needed!

    Quote Originally Posted by sean Buick 76 View Post
    Contact Jim he can set you up with the right parts:



    http://www.v8buick.com/member.php?3880-monzaz

    Thank you Sir for the referral. I have left him a message!

  13. #13
    Join Date
    Oct 2012
    Posts
    7

    Default Re: Proper GEARS needed!

    Quote Originally Posted by flynbuick View Post
    JEGS has no tech that knows squat about this.

    You will have to post in Parts Wanted for a used set of gears. At this time no one makes Buick 9 3/8s.

    LOL!
    Yeah, Thats what its lookin like! Kinda sucks on how rare some of these parts are...

  14. #14
    Join Date
    Oct 2012
    Posts
    7

    Default Re: Proper GEARS needed!

    Quote Originally Posted by TA Perf View Post
    One of the easiest things you could do to help your dead stop acceleration would be to have a 2.75:1 first gear set installed into your T400 trans. Not sure who sells this gear set today but it will make a difference. 3.00:1 are even better but I'm not sure if anyone is still making them.
    Thank you Mike for the info. I'm hoping to find 3.42's, but like you said not sure if anyone is reproducing them. Also, if I have the factory 3.07, will my axles need to be changed if converted to 3.42?

  15. #15
    Join Date
    Oct 2012
    Posts
    7

    Default Re: Proper GEARS needed!

    Quote Originally Posted by flynbuick View Post
    http://www.kilgoretrans.com/html/gearsets.html

    John Kilgore racing for the TH400 3 to 1 gear ratio.



    Thanks
    for the info., but a little out of my price range.

  16. #16
    Join Date
    Oct 2012
    Posts
    7

    Default Re: Proper GEARS needed!

    Quote Originally Posted by bobc455 View Post
    I've used a 2.75 gearset for decades, it worked great with my 2.56 rearend and switch-pitch.

    I used to have a 3.00:1 gearset, however I managed to break that. Most people will probably not have the same problem I did - I was using a pretty big nitrous shot on top of an already healthy 455. I have beat the crap out of the 2.75 gearset, and never had any issues.

    There is a noticable difference in "stoplight response" when using the 3.00 gearset, for sure. The difference is also there with 2.75:1, although obviously not quite the same.

    -Bob C.
    Thanks Bob for the input! Much appreciated. Yeah I think I'm leaning toward the 3.00:1 gear set for freeway use/ drivability as well. I hope I will be able to make the conversion!

  17. Default Re: Proper GEARS needed!

    One of my cars is a 67 GS California, 340 with 110 cam. I kept the 2.78:1 rear end. Tried the switch pitch ST300 with modified convertor and it
    was OK, then replaced it with a TH350 that has a low gear first and a higher stall convertor. Man is that a great combination.
    Deceptively Proficient.

    Ted Nagel
    64 LeSabre Wagon
    65 Wildcat 4-speed
    65 Gran Sport 4-speed
    67 Wildcat
    68 GS 400
    69 GS Stage 1 4-speed
    70 GS Stage 1 4-speed

 

 

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