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Thread: 406 s10 powerglide or th350 or gear swap

  1. #1

    406 s10 powerglide or th350 or gear swap

    I HAVE A 406 SBC IT HAS DISHED PISTONS TO MAKE IT A 10.25 TO 1 CR IT HAS 5.7 HBEAMS.MOTOWN 220 HEADS AND PORT MATCHED INTAKE. 253/261 @.050 WITH 585/595 WITH 1.6 ROCKERS SOLID FLAT TAPPET
    I CURRENTLY HAVE IT IN A 2800-3200 LB S10 WITH A POWERGLIDE AND 4.10 GEAR WITH 4500 STALL.
    .
    .
    MY PROBLEM IS SHOULD I INSTALL A TH350 OR JUST RUN A STEEPER GEAR.4.56OR 488 I FEEL THAT THE 4.10 WITH A GLIDE AND NO NOS IS JUST HURTING ME.I WANT IT TO RUN THE BEST 1/4 MILE ET THAT I CAN. I JUST STREET DRIVE AND TEST AND TUNE . NEVER RUN FOR MONEY JUST ENJOYMENT.
    PLEASE GIVE ME SOME ADVISE . THE GEAR IS THE EASY WY TO GO.

  2. #2
    Senior Member RACING JUNKIE
    Join Date
    Jan 2006
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    La.
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    2,890
    May not be the answer you want to hear, but i have a friend who has a S10 with a 383 and 350 trans, 410 gears. drives it everywhere and to the track. It runs 11.60's on motor and with a 150 shot of nitrous it runs 10.80's on drag radials.

    Zip.

  3. #3
    well doing a tran swap in the truck will only take 2-3 hours but i still have to build the tranny. but i have enough tuff parts to make a nice manual shift th350 but if im going to shell out cash for a manual valvebody i might want to try a tbrake just for the hell of it..
    this engine ran a 11.78 in a 77 firebird with th350 and 4.11 but now ive installed 1.6 rockers to get my lift to 585.595 and i bought a motown 220 intake and an electric waterpump..the truck hooks good . i had 1.52 60foot last year with an old 406 combo. more than likely i will throw togeathger a budget th350 and se how long it lasts. ive had good luck with junk th350's.


    thanks for the advise

  4. #4
    Senior Member DYNO OPERATOR
    Join Date
    Nov 2006
    Location
    NC
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    558
    The turbo 350 has a steeper first gear I believe than a glide .That should help 60 ft it . You may have to do a gear change too or as you say your just having fun with it try the trans change. Do the trans brake their FUN!!!!! David

  5. #5
    Senior Member RACING JUNKIE
    Join Date
    Mar 2003
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    Fountain,MICHIGAN
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    856

    Trans?

    Get YOUR Wallet out,when you go to Purchase that T/Brake for the 350!!!
    Heres My Advise?
    1st of all???How tall of a Tire?
    If you have less than a 28"Tire,keep the 4.10 and go to the 3-spd.
    Bigger Tire(Depending)?
    Leave the Glide in,Loosen the Converter,and either the 4.56 or 4.86?
    Lots of UNKNOWNS Here?
    Hope this Helps?
    Later
    G 8)

  6. #6
    Senior Member RACING JUNKIE jmarksdragster's Avatar
    Join Date
    Jul 2007
    Location
    Florida
    Posts
    635
    You will probably find the 350 is slower. Leave the glide in.
    Mark Whitener
    http://racingfuelsystems.myfunforum.org
    __________

    Good work isn't cheap, and cheap work can't be good.

  7. #7
    thanks
    i have a 28/12.50/15 et street .
    my thoughts are to try the 4.88 gear and bring her out hard . my convertor is about 4500 but when cruising at 2700 rpm and whack the throttle it flashes to about 48/5000.
    .
    im not sure on the rule of thumb but i have a 12.5/8 inch long input turbo spline and i was told that that is a 1.82 first gear. the trans is a tci competition built by tci with manual forward pattern. i was told that a 12.5/8 long shaft ment it wasa 1.82.
    a th350 has a 2.52 first gear i believe
    th400 has a 2.42 .
    thanks for the responses


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