1. Join the Community!

    DSMtuners is a massive archive of DSM information - but more importantly, it's a COMMUNITY! Join in and participate with other DSMers, and invite all of your DSM friends to make this place their home. Chat with others, create a build thread, post questions and answers. Get involved! Logging in will also remove many of the advertisements, along with this notice. ;)

1G To weld the center diff or not That is the question!

Posted by Charliethatguy, May 6, 2019

Please Support STM Tuned
Please Support Fuel Injector Clinic
  1. Charliethatguy

    Charliethatguy Proven Member

    48
    13
    Joined Apr 14, 2018
    Madison, Wisconsin
    Ok So here is the deal. I have the common 2nd gear grind in my trans and am looking to do a rebuild. I have done some research and one of the mods I see guys talking about is Welding the center diff. I have read the threads and some swear by them and some say to stay away. My main question is at what power level do you need to consider doing this and would you recommend it for my current build below.

    1992 Eagle Talon Tsi
    1991 Trans
    Stock Drive train besides new front axles
    16G and bolt ons
    making 350 hp according to Ecm link.
    Goal is around 450 for hp

    Any Input is appreciated!
     

    Street Build 516  3

    1992 Eagle Talon TSi AWD
    awd · manual · 1G DSM
    Loading...
  2. Boomdeeze

    Boomdeeze Proven Member

    2,078
    306
    Joined Jul 5, 2009
    Independence, Minnesota
    With a 16g and being mostly a street car I would say no you don't need a welded center diff.
     

    Street Build 5K  1

    1997 Mitsubishi Eclipse GSX
    10.793 @ 128.98 · 2G DSM
    Loading...
  3. Canadian_CD9A

    Canadian_CD9A Proven Member

    670
    284
    Joined Feb 10, 2012
    Winnipeg, MB, Canada
    It's not a power thing, it's got more to do with how often you drag race it. A welded center diff is hell on a street car, and utterly pointless if you're not racing it.
     
    ThunderChild likes this.
  4. BLACK'98DSM

    BLACK'98DSM Proven Member

    2,394
    724
    Joined Feb 9, 2019
    Hoover, Alabama
    If you weld your diff, you have to make sure it is a quality weld or else it will break and your diff will be toast from the debris.

    But I don't recommend it if you drive much because it will eat up your tires and negatively effect your steering.

    Drag strip = yes
    Street = no
     

    Road Race Build 4K  11  24

    1998 Mitsubishi Eclipse N/T
    fwd · manual · 2G DSM

    110  3

    2010 Subaru WRX
    awd · manual · Misc Vehicles
    Loading...
  5. ThunderChild

    ThunderChild Supporting VIP

    3,757
    1,109
    Joined Jan 5, 2012
    Rathdrum, Idaho
    I have my diff welded, flyin' miata power steering delete and drive my car often, essentially DD. I didn't have a better monetary option when I redid the trans.

    Its not great to drive in a daily, but it's not horrible, just be aware things get rough when you have to make tight turns. Mine is worse than most since I don't have power steering either, but if I were in the same position, I wouldn't hesitate to weld it again.

    If money is not as tight, a 4 spider diff is a very nice option, @bastarddsm makes a very nice one that will hold gobs of power, but still give you drivability. It's spendy and idk if he has parts for them currently, there are other vendors that can do the same such as @twicks69 maybe?

    Basically, if you want stock-like drivability with better power handling and it's not a sole drag car, a 4 spider is good for you as long as you don't mind spending the money on it.
    If you want the ultimate in power holding, drivability-be-dammed, welded works great and is cheap. Just don't be bummed when it's a bicth to drive in the parking lot.

    Also FWIW, I welded mine in my shop with a mig welder and pre-heating with a rose-bud. Has ~25-30 drag passes/hard launches on it and 20+k miles, zero issues.
     

    Street Build 1K  3

    1990 Plymouth Laser N/T
    fwd · manual · 1G DSM

    1K  8

    1987 Toyota Pickup/Hilux
    awd · manual · Misc Vehicles

    Street Build 2K  7

    1997 Mitsubishi Eclipse Spyder GST
    fwd · manual · 2G DSM

    2K  0

    1992 Eagle Talon TSi AWD
    manual · 1G DSM

    Street Build 3K  10

    1992 Eagle Talon TSi AWD
    awd · manual · 1G DSM
    Loading...
    tk106 likes this.
  6. Charliethatguy

    Charliethatguy Proven Member

    48
    13
    Joined Apr 14, 2018
    Madison, Wisconsin
    Ok I mostly do street pulls and only take it out for a highway or strip cruise. I just read that the stock 2 gear can cause strain on other drivetrain parts and make them break sooner. If I would weld it I would have jacks do it when I send them my gear sets so the quality wouldnt be an issue. Im just worried about hurting the trans parts if I dont do it.
     

    Street Build 516  3

    1992 Eagle Talon TSi AWD
    awd · manual · 1G DSM
    Loading...
  7. Chumpaumpalumpa

    Chumpaumpalumpa Proven Member

    1,551
    297
    Joined Jun 16, 2014
    La Habra, California
    I’ve had two 4 spiders and two welded diffs. I have power steering. It’s fine. You only really notice it on u-turns. These cars have a horrific turning radius already so it’s not like you won’t be making a 3 point turn anyways. Send it out to Jack’s.
     

    Street Build 4K  22

    1990 Eagle Talon TSi AWD
    awd · manual · 1G DSM
    Loading...
    ThunderChild likes this.
  8. Charliethatguy

    Charliethatguy Proven Member

    48
    13
    Joined Apr 14, 2018
    Madison, Wisconsin
    Cool Thanks for the Input guys!
     

    Street Build 516  3

    1992 Eagle Talon TSi AWD
    awd · manual · 1G DSM
    Loading...
    BLACK'98DSM likes this.
  9. Bo0sTeD 4G63

    Bo0sTeD 4G63 Proven Member

    456
    74
    Joined Aug 31, 2008
    Miami, Florida
    I welded my center diff and haven't had a problem. but are you talking about center diff or front diff?
     

    Street Build 1K  1

    1997 Mitsubishi Eclipse GSX
    awd · automatic · 2G DSM
    Loading...
  10. TK's9d2TSi

    TK's9d2TSi Supporting Member

    4,425
    1,760
    Joined Sep 11, 2017
    Cincinnati, Ohio
    I also have a welded diff on my 1g and had 4 spider on my old 2g. 4 spider was nice, no problems driving street and launches at track (407 to the wheels). The welded is a pain like everyone mentioned especially in reverse, forward isn’t as bad and manageable. If you parallel park often, I wouldn’t recommend it.
     

    617  3

    2000 Jeep Cherokee Sport - Classic
    awd · automatic · Misc Vehicles

    673  4

    93 Civic 4 Door -sold-
    fwd · manual · Misc Vehicles

    Street Build 4K  6

    1992 Eagle Talon TSi AWD
    12.2 @ 120 · 1G DSM
    Loading...
  11. TK's9d2TSi

    TK's9d2TSi Supporting Member

    4,425
    1,760
    Joined Sep 11, 2017
    Cincinnati, Ohio
    You can not turn the wheel more than halfway to full lock from a stop and reverse without it starting to bind the rear diff.
     

    617  3

    2000 Jeep Cherokee Sport - Classic
    awd · automatic · Misc Vehicles

    673  4

    93 Civic 4 Door -sold-
    fwd · manual · Misc Vehicles

    Street Build 4K  6

    1992 Eagle Talon TSi AWD
    12.2 @ 120 · 1G DSM
    Loading...
  12. donniekak

    donniekak DSM Wiseman

    5,614
    949
    Joined Mar 23, 2008
    Surprise, Arizona
    This is what happens when you launch on a stock or 4 spider diff.



    This is a welded diff launch, much smoother.

     

    Street Build 4K  0

    1991 Eagle Talon TSi AWD
    manual · 1G DSM
    Loading...
    We're on Boost likes this.
  13. motomattx

    motomattx Proven Member

    3,274
    1,181
    Joined Dec 9, 2010
    wampum, Pennsylvania
    Center diff yes, front diff no unless your racing it.
     

    Drag Race Build 4K  10  24

    1995 Mitsubishi Eclipse GST
    fwd · manual · 2G DSM
    Loading...
  14. Charliethatguy

    Charliethatguy Proven Member

    48
    13
    Joined Apr 14, 2018
    Madison, Wisconsin
    Yeah no this would be a street car. I don't street park it so it would never be parallel parked. I was just worried about maybe breaking more drive train parts if I welded it. Its on street tires
     

    Street Build 516  3

    1992 Eagle Talon TSi AWD
    awd · manual · 1G DSM
    Loading...
  15. Charliethatguy

    Charliethatguy Proven Member

    48
    13
    Joined Apr 14, 2018
    Madison, Wisconsin
    @donniekak Thanks for the video that makes it way easier to see the difference.
     

    Street Build 516  3

    1992 Eagle Talon TSi AWD
    awd · manual · 1G DSM
    Loading...

Share This Page

Support Vendors who Support the DSM Community
Boosted Fabrication ECM Tuning ExtremePSI Feal Suspension Fuel Injector Clinic Jacks Transmissions JNZ Tuning Kiggly Racing Morrison Fabrications MyMitsubishiStore.com OHM Racing Raven Fabrication RixRacing RockAuto RTM Racing SouthBay Fuel Injectors STM Tuned VR Speed Factory