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.

Life expectancy.

Discussion in 'The Garage' started by crazyrc, Mar 30, 2003.

  1. crazyrc

    crazyrc 1/2 ton status

    Joined:
    Jan 20, 2003
    Posts:
    106
    Likes Received:
    0
    Location:
    Northern Alberta, Canada
    New Engine dynoed at 460HP and 540lbs torque. /forums/images/graemlins/grin.gifI've got a decently built 700R4 and a 208. Which one is more likely to break first. 4.56 and Lockers front and rear.

    Has anyone had a 208 last with this much truck. There are no rocks up here, so the truck only plays in the mud.
    I'm thinking t400 and 205.
     
  2. j20m715

    j20m715 1/2 ton status

    Joined:
    Aug 25, 2001
    Posts:
    1,056
    Likes Received:
    3
    Location:
    Murphy,Tx
    Id put money on the 700 breaking first!!!
    If the 208 is in good shape it will be the 700.

    Let us know how it goes.
     
  3. Grim-Reaper

    Grim-Reaper 3/4 ton status Author

    Joined:
    Feb 17, 2000
    Posts:
    7,385
    Likes Received:
    0
    Location:
    Atlanta
    Time for a TH400 and a NP205 dude!
    GM didn't put the 700R4 behind the big blocks for a reason.
     
  4. Topdown

    Topdown 1/2 ton status

    Joined:
    Nov 26, 2002
    Posts:
    2,598
    Likes Received:
    0
    Location:
    Vancouver, Washington, U.S.A
    I'd put a bet on the 700R breaking first... unless you bought a really beefed/bulletproof version.

    I agree also with the TH400... I see one of those in your future.

    -Ryan /forums/images/graemlins/k5.gif
     
  5. 83ZZ502_Jimmy

    83ZZ502_Jimmy 1/2 ton status

    Joined:
    Feb 7, 2001
    Posts:
    3,103
    Likes Received:
    0
    Location:
    Richmond, VA
    IMO the 208 should be fine, thats what I run in all my trucks. The 700R4 will go pretty quick.

    If you play in the mud, I would look into a 400/205 combo.

    John [​IMG]
     
  6. TXsizeK5

    TXsizeK5 1/2 ton status

    Joined:
    Aug 26, 2001
    Posts:
    2,518
    Likes Received:
    0
    Location:
    College Station, TX
    [ QUOTE ]
    I would look into a 400/205 combo.


    [/ QUOTE ]

    Yeah, you rarely need the 2.61 low ratio for mud. You might also want to look into an sm465 atleast IMHO.

    I usually always use 1st and 4hi for mud and 4lo for hills and whatnot. BUt that was with 4.56 and 35's now with 4.10's i might have to use 4lo it more often.
     
  7. yellowK20

    yellowK20 Well Lubricated Premium Member GMOTM Winner

    Joined:
    Dec 26, 2002
    Posts:
    7,602
    Likes Received:
    554
    Location:
    Wasilla AK,
    The 208 is done if you have a good Well built 700r-4 I've shelled 3 208 since december On the street I have a built 377 small block 4.88 gears 37" mtr's and a TCI trans with a 2800 stall covertor it I keep Knocking High range out I'm not exactly sure what's happening to them cuz I've been turning them in for cores at the junk yard /forums/images/graemlins/truck.gif
     
  8. Kyle89K5

    Kyle89K5 1/2 ton status

    Joined:
    Feb 17, 2000
    Posts:
    2,273
    Likes Received:
    0
    Location:
    OKLAHOMA
    If you are bent on keeping the 700, then do to it what you did to the motor. Build it. They can be made to standup to the power, you just have to invest a little in it.

    Personally, I'm a fan of the 700. Mine's been built up pretty well and should hold up just fine behind my stock 350.
     
  9. CHEVY 4WD

    CHEVY 4WD 1/2 ton status

    Joined:
    May 14, 2002
    Posts:
    1,773
    Likes Received:
    0
    Location:
    Florida
    Ok ok you might need a stronger tranny and t-case
    but I want to hear about this MOTOR PLEASE tell me its a SB I love bad sb's oh yea go easy on it when your on the pavement and try to get off the gas when it shifts. /forums/images/graemlins/rotfl.gif/forums/images/graemlins/thumb.gif
     
  10. crazyrc

    crazyrc 1/2 ton status

    Joined:
    Jan 20, 2003
    Posts:
    106
    Likes Received:
    0
    Location:
    Northern Alberta, Canada
    Yes its a SB 400. I'm running Dart heads with larger intake and exhaust valves and many...many hours on the flowbench. The intake valves are 2.05. /forums/images/graemlins/grin.gifEverything else is pretty normal.
    Edelbrock RPM intake
    Holley Truck Avenger Carb
    9.8:1 Compression
    balanced
    Flow Tech headers
    Proform Billet Distributor
    MSD Wires.
    Comp 4x4 extreme energy roller cam /forums/images/graemlins/grin.gif
     
  11. crazyrc

    crazyrc 1/2 ton status

    Joined:
    Jan 20, 2003
    Posts:
    106
    Likes Received:
    0
    Location:
    Northern Alberta, Canada
    I've talked to some race tranny builders. They say the 700 could handle it, but the 700 is weak when going from stationary to moving. Once its moving they say it will take a lot if built right. Options are as follows...
    T400 manual shift about 1100 Can (blue plate etc) +conv.
    T400 automatic shift same price
    4l80 manual shift about 2600 Can + converter. /forums/images/graemlins/shocked.gif
    I'll go 205 regardless. He says the 4l80 would handle 900HP
    These tranny'swould more money but the tranny shop is helping me out.
    Would you guys consider installing the lower gear sets in either tranny. Lower first and second. about 450 US I think
     
  12. CHEVY 4WD

    CHEVY 4WD 1/2 ton status

    Joined:
    May 14, 2002
    Posts:
    1,773
    Likes Received:
    0
    Location:
    Florida
    Thats pretty inpressive for the only really extreme thing is the heads I bet you still get decent gas milage too /forums/images/graemlins/thumb.gif How much do you think you go in the heads if you dont mind telling us
     
  13. crazyrc

    crazyrc 1/2 ton status

    Joined:
    Jan 20, 2003
    Posts:
    106
    Likes Received:
    0
    Location:
    Northern Alberta, Canada
    There's a story behind the heads. A race shop gave the heads to their best flowbench guy. They simply told him to make them flow as much as possible. After about 60 hours on the bench he was satisfied. I'll have to dig to find the flow numbers. They built these heads as reference piece. I was the lucky one who ended up with them. They said if a customer came in and wanted that the same numbers they would be looking around 3500-4000 Can. I saved a pile because they ran them on their shop truck for a few months and then parted out the shop truck. They put new valves etc. in them(although not necessary) and sold them to me with the engine I had them build.
     

Share This Page