+ Reply to Thread
Page 1 of 5 1 2 3 ... LastLast
Results 1 to 10 of 46

Thread: 4L60e or TH400?

  1. #1
    Join Date
    Jan 2008
    Posts
    1,550

    4L60e or TH400?

    Ok so with my new found power, Im kind of worrying about my slightly built 60e and circle d 3C. It runs and shifts absolutely perfectly but I dont want to wait till one or the other gives out to do a swap because if one goes then both are going to be practically worthless. So should I be really worried as much as I am? Im looking to push it to around 650rwhp and want to be 100% confident that my tranny and stall will hold. I talked to my tranny builder and I he said he has a few turbo 400's at the shop and will build one to the max for me for only $900, that includes the tranny and rebuilding it and he is really good. I did a little research and it looks like I will need to get a new flexplate and im looking at the TCI unit which is $230. I will also have to get a stall capable of 800-1000 hp and Im still confused as to what brand and what style converter, SBC or retro LSX or what. Im wanting to go with the 400 rather than a 4L80 because its easily 65lbs lighter, way cheaper and simpler. Im also throwing around the idea of a transbrake but im not sure yet. So what do yall think about me doing the swap and if anybody has already done it can you please lend some advice.

    04 RCSB 5.3, Homemade 80mm FM, TU1, TH400

  2. #2
    Join Date
    Nov 2003
    Location
    Denton Texas
    Posts
    20,540
    get a neal chance convertor. Call them and tell them your application and they'll build you one mean mother convertor.
    See my truck data in the "My Garage" section here... http://www.ls1truck.com/forums/my-ga...tml#post191709

  3. #3
    Join Date
    Jan 2008
    Posts
    1,550
    Thats one of the companies my tranny guy recommended! Do you have a 400?

    04 RCSB 5.3, Homemade 80mm FM, TU1, TH400

  4. #4
    Join Date
    Nov 2003
    Location
    Denton Texas
    Posts
    20,540
    nope, 4L80e and run a precision industries 3600 vigilante convertor custom built to fit a LSx flexplate. I like having overdrive even though I run 3.23 gears. Low RPMs means less oil vapors plus turbos love numerically low gearing.
    See my truck data in the "My Garage" section here... http://www.ls1truck.com/forums/my-ga...tml#post191709

  5. #5
    Join Date
    Jan 2008
    Posts
    1,550
    Yea Ill also be swapping the 4.10s out for some 3.42s.

    04 RCSB 5.3, Homemade 80mm FM, TU1, TH400

  6. #6
    Join Date
    Sep 2010
    Location
    San Antonio, TX
    Posts
    468
    With the TH400 my main concern would be the loss of overdrive. I drive my stuff around too much to do with out. If you wont have that problem then go 400
    @J_Industries ON INSTGRAM

    TURBO MIC PERFORMANCE
    MAZZULLA OFF-ROAD
    KING SHOCKS

    [HOONIGAN]

  7. #7
    Join Date
    Jan 2008
    Posts
    1,550
    Yea, ive thought about it and Im not too concerned about it

    04 RCSB 5.3, Homemade 80mm FM, TU1, TH400

  8. #8
    Join Date
    Nov 2007
    Location
    Pittsburgh, PA
    Posts
    3,581
    4l80 vs th400 isnt much of a weight difference
    2002 Lightning - GT headed 5.5Litre w/ Twin 7665s
    2002 Silverado - 427Lsx w/ Twin gt4202s
    2010 Silverado crewcab Z71 - 5.3litre w/ procharger
    2000 Wrangler - 5.3litre with some stance
    2014 Xsport- 3.5 Eco boost
    412 Motorsports

    it ain't that I'm too big to listen to the rumors, It's just that I'm too damn big to pay attention to 'em..That's the difference

  9. #9
    Join Date
    May 2008
    Location
    Crowder, OK
    Posts
    8,005
    Its a street truck. A 400 weighs about the same as an 80e. I'd do 80e all the way.

    1969 Chevy RCLB C10 350/TH400 SOLD
    2007 Chevy RCSB 4.8 4x4 LS SOLD
    2008 Chevy RCSB 5.3 4x4 LT SOLD
    2010 Chevy CCSB 6.2 4x4 LT SOLD
    2005 GMC CCLB DRW 6.6 Duramax 4x4 191,000 and counting
    2013 FORD CCSB F350 6.7 Powerstroke 4x4


  10. #10
    Join Date
    Nov 2003
    Location
    Denton Texas
    Posts
    20,540
    400 is lighter but not that much. The benefits of having an overdrive outweigh the added weight. The convertor is where a lot of the added mass comes from on an 80e and if you're getting an aftermarket convertor then you can reduce weight by getting a 9.5-10.5" converter to drop about 35 lbs during the conversion.
    See my truck data in the "My Garage" section here... http://www.ls1truck.com/forums/my-ga...tml#post191709

+ Reply to Thread

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts