Dismiss Notice

Welcome To CK5!

Registering is free and easy! Hope to see you on the forums soon.

Score a FREE t-shirt and membership sticker when you sign up for a Premium Membership and choose the recurring plan.

Why did GM use Torsen bars?

Discussion in 'The Garage' started by Pookster, Jun 13, 2004.

  1. Pookster

    Pookster 1/2 ton status

    Joined:
    Nov 21, 2000
    Posts:
    3,195
    Likes Received:
    0
    Location:
    NYC, NY, USA
    So I keep thinking to myself....

    Ford uses Leaf Springs for the front axle. (250+)
    Dodge uses Coil Springs
    GM uses Torsen bars (4wd) and now using springs in the rear of their 1/2 tons.

    ok, other than "thats what they decided to do"... it would have seemed like springs (proven) woulda worked better and smoother than torsen?
     
  2. K5MONSTERCHEV

    K5MONSTERCHEV 1/2 ton status

    Joined:
    Jan 27, 2003
    Posts:
    3,254
    Likes Received:
    0
    Location:
    Castro Valley, CA
    GM has the tortion bars on their 2wds also.

    There supposed to be smoother riding.
     
  3. Pookster

    Pookster 1/2 ton status

    Joined:
    Nov 21, 2000
    Posts:
    3,195
    Likes Received:
    0
    Location:
    NYC, NY, USA
    /forums/images/graemlins/thinking.gif Which two wheel drives ? all the FS trucks in 2wd I've seen use only coils. Though there are the random Solid front 2wd models with.. leafs...
     
  4. pauly383

    pauly383 Daddy383 Staff Member Moderator

    Joined:
    Jul 22, 2001
    Posts:
    16,217
    Likes Received:
    1
    Location:
    Mesa , Arizona USA
    Well since GM went to Independent front suspension, and its four wheel drive, seems to me if they used coil springs , you couldn't have an axleshaft in that space . And as for rear of the trucks, I believe only the Hummer and Tahoes etc got rear coils. Most pickups and the Colorado for sure have rear leaves /forums/images/graemlins/k5.gif
     
  5. u2slow

    u2slow 1/2 ton status

    Joined:
    May 9, 2001
    Posts:
    2,217
    Likes Received:
    0
    Location:
    BC Canada
    The 2wd trucks changed to torsion bars for '99 in the re-styled Silverado/Sierra. 2wd vans changed to torsion bars for '03.
    EDIT:

    Torsion bars makes production easier. Now a 2wd is just a gutted 4x4.

    Avalanche and Suburban 1500 are rear coil as well for improved ride.
     
  6. 84_Chevy_K10

    84_Chevy_K10 Banned

    Joined:
    May 30, 2001
    Posts:
    17,669
    Likes Received:
    0
    Location:
    IL, USA
    [ QUOTE ]
    Well since GM went to Independent front suspension, and its four wheel drive, seems to me if they used coil springs , you couldn't have an axleshaft in that space .

    [/ QUOTE ]

    You wouldn't have an axle shaft in that exact place but that doesn't make it impossible.

    Check out a hummer H1 sometime or a HMMWV.
     
  7. BadDog

    BadDog SOL Staff Member Super Moderator Author

    Joined:
    Feb 24, 2001
    Posts:
    7,777
    Likes Received:
    11
    Location:
    Phoenix, AZ
    For one thing, springs don't have to go in the center of the upper/lower arms. There are a variety of ways to do it, one of the most common alternatives being on top of the upper.

    T-bars are simple, inexpensive, compact, easily tune-able, and robust. They also have a natural tendency to increase rate as lever angle increases (assuming starting near horizontal) due to changes in rotational force (think component vectors) as the lever gets more vertical.
     
  8. pauly383

    pauly383 Daddy383 Staff Member Moderator

    Joined:
    Jul 22, 2001
    Posts:
    16,217
    Likes Received:
    1
    Location:
    Mesa , Arizona USA
    [ QUOTE ]
    You wouldn't have an axle shaft in that exact place but that doesn't make it impossible.

    Check out a hummer H1 sometime or a HMMWV.


    [/ QUOTE ]

    It may be possible, but those trucks you mentioned were not designed for the general public. I may not be an expert , but I do know that GM would of took the easy way out and made the trucks as cheap as they could , including R+D money, they are a business you know. /forums/images/graemlins/k5.gif
     
  9. 84_Chevy_K10

    84_Chevy_K10 Banned

    Joined:
    May 30, 2001
    Posts:
    17,669
    Likes Received:
    0
    Location:
    IL, USA
    There are others, those are just the examples I can think of. I believe the newer toyota trucks use coils up front with IFS. I don't much care for IFS so I don't research it very much at all....but I know there are plenty of rigs on the market with a arms and coils.
     
  10. pauly383

    pauly383 Daddy383 Staff Member Moderator

    Joined:
    Jul 22, 2001
    Posts:
    16,217
    Likes Received:
    1
    Location:
    Mesa , Arizona USA
    Thats one of the reasons I can never a buy a new truck (for wheeling), IFS is fine for the wifes car, but not my truck. /forums/images/graemlins/waytogo.gif
     
  11. 84_Chevy_K10

    84_Chevy_K10 Banned

    Joined:
    May 30, 2001
    Posts:
    17,669
    Likes Received:
    0
    Location:
    IL, USA
    I have an IFS rig for a daily driver, but I never expect to do anything with it. /forums/images/graemlins/thumb.gif
     
  12. sled_dog

    sled_dog 1 ton status

    Joined:
    Sep 3, 2002
    Posts:
    16,870
    Likes Received:
    0
    Location:
    Austin, TX
    The new F150s have Coil spring A arm 4wd setups. My daily driver has IFS as well, no transfer case or front diff either /forums/images/graemlins/wink.gif
     
  13. kennyw

    kennyw N9PHW Premium Member

    Joined:
    Jun 9, 2002
    Posts:
    13,223
    Likes Received:
    94
    Location:
    Stevens Pass Highway, WA
    [ QUOTE ]
    /forums/images/graemlins/thinking.gif Which two wheel drives ? all the FS trucks in 2wd I've seen use only coils. Though there are the random Solid front 2wd models with.. leafs...

    [/ QUOTE ]

    1960-62 Chevy and GMC were torsion bar front suspension on the 2wd's /forums/images/graemlins/thumb.gif Even used them all the way up to the large 2 ton and bigger trucks. Makes one heck of a smooth ride compared to leaf spring front suspensions and alot easier to package together than the coil springs on 4x4 IFS trucks.
     
  14. 55Willy

    55Willy 3/4 ton status

    Joined:
    Jun 2, 2001
    Posts:
    9,946
    Likes Received:
    0
    Location:
    Keizer, Or
    the new dodges are torsion as well.
     
  15. sled_dog

    sled_dog 1 ton status

    Joined:
    Sep 3, 2002
    Posts:
    16,870
    Likes Received:
    0
    Location:
    Austin, TX
    1/2 tons thats correct. Durangos and Dakotas have been for a long time.
     
  16. beater_k20

    beater_k20 Banned

    Joined:
    Dec 9, 2003
    Posts:
    10,276
    Likes Received:
    0
    Location:
    Elkhart, IN
    [ QUOTE ]
    And as for rear of the trucks, I believe only the Hummer and Tahoes etc got rear coils. Most pickups and the Colorado for sure have rear leaves /forums/images/graemlins/k5.gif

    [/ QUOTE ]

    Hummer H1 was the only truck, sonce 1972 to come with rear leaf suspension. the H2 is just built on a K2500 chassis, so nothing special there.
     
  17. BlazerGuy

    BlazerGuy 3/4 ton status

    Joined:
    Apr 20, 2000
    Posts:
    9,206
    Likes Received:
    0
    Location:
    abcde
    [ QUOTE ]
    Hummer H1 was the only truck, sonce 1972 to come with rear leaf suspension.

    [/ QUOTE ]

    /forums/images/graemlins/thinking.gif
     
  18. Bullet

    Bullet 1/2 ton status

    Joined:
    Mar 14, 2001
    Posts:
    1,222
    Likes Received:
    0
    Location:
    Abilene, Texas
    [ QUOTE ]
    The 2wd trucks changed to torsion bars for '99 in the re-styled Silverado/Sierra. 2wd vans changed to torsion bars for '03.
    EDIT:

    Torsion bars makes production easier. Now a 2wd is just a gutted 4x4.

    Avalanche and Suburban 1500 are rear coil as well for improved ride.

    [/ QUOTE ]

    My 2001 Chevy regular cab shortbed has coil springs /forums/images/graemlins/thinking.gif
     
  19. m j

    m j 1/2 ton status

    Joined:
    Dec 28, 2001
    Posts:
    4,606
    Likes Received:
    0
    a coil spring is just a bent up torsion bar
    the torsion bar is the best spring design
    lowest friction loss
     
  20. Pookster

    Pookster 1/2 ton status

    Joined:
    Nov 21, 2000
    Posts:
    3,195
    Likes Received:
    0
    Location:
    NYC, NY, USA
    Dunno, my k2500 rides a lot rougher than my friends yukon XL does.
     

Share This Page