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Lloyd Elliott

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  1. #1
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    Default Pros and cons of swapping from a 60e to a 400

    so im really thinking about swaping over my car from a cpt pro race built 60e to a cpt 400 with a brake but i need some. pros and cons from everyone so it can make my choice a little easier.
    set up
    350
    H/C
    DANA 60 -4.10 GEAR
    STALL AS IS RIGHT NOW 3600-3800
    NITROUS CAR ON A PROGRESSIVE 125 SHOT
    26" TIRE

  2. #2
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    AL
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    Default

    Well the brake is definitely a plus. Other than that, you lose overdrive. Unless the 400 has better gear ratios for your application.

  3. #3
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    Default

    Upside - TH400 can be built for more power (but Cahall can build a killer 60E), easy to run a brake and a manual valve body.

    Downside - heavy, larger drivetrain losses (saw over 20% drivetrain loss at 750 HP with a non-locking converter). And as mentioned above, no O/D (unless you add a heavy, expensive Gear Vendors O/D). Then there's the 2.48:1 1st Gear, vs. 3.06:1 in a 4L60E. New driveshaft required. New/modified trans cross-member

    With the TH400 and 4.11 gears I was running close to 4,000 RPM at 70 MPH with street tires. The GV lowered it to a bit above 3,000 RPM.
    Last edited by Injuneer; 02-07-2018 at 07:18 PM.

    94 Formula A3+1: 381ci forged stroker - Callies Stealth, Oliver 5.85 billet rods, BME nitrous pistons / CNC LT4 heads / Comp Cams solid roller / TH400+GearVendors OD / 4.11's/Strange 12-bolt / 300-shot (dry) N2O / Spohn Suspension / 6-pt roll bar /AutoMeter instrumentation / MoTeC M48 Pro engine management system /a few other odds 'n ends.

  4. #4
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    Jeff Green
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    Default

    Unless you're over 1200 HP there is no good reason to go to a 400. If built right a 4L60E can take up to 1300 HP and you can put a brake on a 4L60E.

    I had a Rossler 4L60E in a 4500 pound Impala and got it to a best of 9.2 at 157 MPH. There is a video on u-tube that someone took of the Impala on a test pass that shows 9.4 at 153 MPH and that was on a 4L60E with a factory ten bolt rear end and at 4500 pounds. I think you can find the video searching "Jeff Green 9.4". The video quality is bad but it shows what can be done.

    In a Camero that weighs 1000 pounds less or more, you should never hurt a 4L60E if its built right. You should be able to run it into the 8's with a lighter car.

    So my vote would be not to put a 400 in your car.

  5. #5
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    Alex Rauld
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    That's an amazing testament to what the 4L60e is capable of in the proper hands.
    1994 Trans Am GT - HPS Ported Heads/Intake, LE Cam, FTI 3600, TP Built 4L60e, Moser 9" w/ 3.90's, BMR Suspension, Formato Tuned

  6. #6
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    @Cahall has built 4l60e's that go 9's and 10's all day for camaros and impalas as well.

    Sent from my SM-N950U using Tapatalk
    2009 G8 GXP #871 - Stock and faster than my LT1

    1994 Z28 T56 - Le2 H/C, SBE, Hooker lt's, some rod ended suspension stuff, and a whole lotta tetanus

    The wrench for LTConvert's 94 Z28- Ellwein 383/LE Trickflows/ P600B/ CPT Pro Race/Pro Torque 3200

  7. #7
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    THIS IS A CPT TRANS FROM FRANK. just trying to get pros and cons.

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