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.

stay with 700r4 or go with th400

Discussion in 'The Garage' started by wraenking, Mar 27, 2006.

?

stay with 700r4 or go with th400

  1. 700r4

    46 vote(s)
    53.5%
  2. th400

    40 vote(s)
    46.5%
  1. wraenking

    wraenking 1/2 ton status

    Joined:
    Apr 30, 2003
    Posts:
    1,493
    Likes Received:
    0
    Location:
    Toms River, NJ
    im still up in the air on what i should do. ill be doing some offroading and some around town driving. no long trips.

    keep in mind, i have access to anything i need to complete the th400 swap for a good price. i also have 3/4 tons with 4.10's if that adds into it.


    also, is there a good write up on doing the th400 swap?
     
  2. yoshisv

    yoshisv 1/2 ton status

    Joined:
    Feb 19, 2006
    Posts:
    266
    Likes Received:
    0
    Location:
    Hartsville, Tennessee
    What are wanting to gain by converting to a 400? I converted from a 700r4 to a sm465. It took about a day, And so far it is holding up better than the 700r4.
     
  3. wayne

    wayne 3/4 ton status

    Joined:
    Feb 1, 2001
    Posts:
    6,178
    Likes Received:
    0
    Location:
    Carlisle, Pa
    I did the swap in my 89 then again in my 90. If you do the th400 switch and have to rebuild the trans then put a low gear set in it. I did not hook up the kickdown and have had no problems with it over the past 3 years. You will also need vacumme to the modulator. Overall it is a pretty easy swap.
     
  4. wraenking

    wraenking 1/2 ton status

    Joined:
    Apr 30, 2003
    Posts:
    1,493
    Likes Received:
    0
    Location:
    Toms River, NJ
    the guys saying no, can you give the reasons?
     
  5. BranndonC

    BranndonC 3/4 ton status

    Joined:
    Mar 18, 2002
    Posts:
    8,591
    Likes Received:
    0
    Location:
    Anaheim, Ca
    what power are you putting through it, what transfer case? I have a th400. But would love the OD of the 700r4 but I need the strength of the 400
     
  6. 1985_K5_Silverado

    1985_K5_Silverado 1/2 ton status

    Joined:
    Dec 21, 2005
    Posts:
    984
    Likes Received:
    0
    Location:
    Corn Country
  7. yellowK20

    yellowK20 Well Lubricated Premium Member GMOTM Winner

    Joined:
    Dec 26, 2002
    Posts:
    7,603
    Likes Received:
    555
    Location:
    Wasilla AK,
    Overdrive and lower first gear. lower thn the "low gearsets available for the Th400. 3.64 to one versus 2 something for the Th400 and the r-4 can be built nearly as tough........of course the 4L80 would be the best of both worlds
     
  8. Hossbaby50

    Hossbaby50 3/4 ton status

    Joined:
    Sep 1, 2001
    Posts:
    8,972
    Likes Received:
    0
    Location:
    Peoria, AZ
    I am building my truck for crawling. I am after strength and reliability so I am going to swap in a TH400 next. The low 1st in the 700R4 is nice (3.06:1) but it won't hurt me that bad crawling. The Tuned Port makes plenty of lowend grunt to crawl with.

    I am on 700R4 #6 currently and this is the last one I am going to try. I am going to swap the TH400 in and forget about it.

    Harley
     
  9. yellowK20

    yellowK20 Well Lubricated Premium Member GMOTM Winner

    Joined:
    Dec 26, 2002
    Posts:
    7,603
    Likes Received:
    555
    Location:
    Wasilla AK,
    bowtie overdrives
     
  10. Hossbaby50

    Hossbaby50 3/4 ton status

    Joined:
    Sep 1, 2001
    Posts:
    8,972
    Likes Received:
    0
    Location:
    Peoria, AZ
    no thanks. I already have a TH400 sitting in the garage. The K5 doesn't see alot of highway use anymore anyway to the OD is pretty much useless to me. The TH400 will cost me less to build and last longer.

    Harley
     
  11. yellowK20

    yellowK20 Well Lubricated Premium Member GMOTM Winner

    Joined:
    Dec 26, 2002
    Posts:
    7,603
    Likes Received:
    555
    Location:
    Wasilla AK,
    That's cool the TH400 is a good trans .
     
  12. Masiony

    Masiony 1/2 ton status

    Joined:
    Sep 2, 2005
    Posts:
    729
    Likes Received:
    0
    Location:
    Springfield, OR
    im going to run the factory 700r4 in my 85' till it fails me, im giving it just one chance (though my friends think im foolish). then im going to a 400. im also giving that just one chance, and if i break that one, i will be going to a sm465. i dont think you can break those. and even if you do, it typically will still be good for a 100,000 miles after anyways.
     
  13. Jishory

    Jishory 1/2 ton status

    Joined:
    Jan 8, 2002
    Posts:
    1,367
    Likes Received:
    0
    Location:
    Palmdale, CA
    holy freaking crap, you did that in a day?

    if you can afford it i would say go with a built 700r4
     
  14. wraenking

    wraenking 1/2 ton status

    Joined:
    Apr 30, 2003
    Posts:
    1,493
    Likes Received:
    0
    Location:
    Toms River, NJ
    jeez. why does my poll have to be around 50/50?

    lol

    im running a sb 350 bored .30 over. truck avenger carb, 4.10 gears and a 208 transfer case.
     
  15. mostwanted

    mostwanted 1/2 ton status

    Joined:
    Feb 5, 2006
    Posts:
    765
    Likes Received:
    0
    Location:
    Kansas City, MO
    What about the 4L80E? Too expensive? Any problems/
     
  16. gonger

    gonger Registered Member

    Joined:
    Nov 8, 2004
    Posts:
    42
    Likes Received:
    0
    I like my 700 with 37s' and 4.88 gear, stock motor.
     
  17. MarcS

    MarcS 1/2 ton status

    Joined:
    Oct 4, 2002
    Posts:
    515
    Likes Received:
    0
    Location:
    NJ

    It doesn't sound like your making a huge amount of power/torque, I would just go with a built 700-r4. Nice 1st gear and OD if you need it.
     
  18. wraenking

    wraenking 1/2 ton status

    Joined:
    Apr 30, 2003
    Posts:
    1,493
    Likes Received:
    0
    Location:
    Toms River, NJ
    i just talke to the guy that will be swapping the trannies for me and he said the same thing.

    ill stick witht the 700r4 and have hime beef it up a bit ans make damn sure i put the support arms from the cover to the engine mounts in!!
     
  19. goldwing2000

    goldwing2000 Guest

    I wouldn't use a 700R4, even if it was free.
     
  20. jekbrown

    jekbrown I am CK5 Premium Member GMOTM Winner Author

    Joined:
    May 19, 2001
    Posts:
    45,031
    Likes Received:
    366
    Location:
    Vancouver, WA, USA
    th400 is tough as hell and cheap to build. Can't beat that combo for a trail rig IMO. I have had a built 700.. and its never let me down before, but if your future plans are full of hardcore wheelin, BBCs, huge tires etc... just go 400 from the start. In hindsight, thats prolly what I should have done.

    My 400 will have a deep cast pan, Redneck Trans reverse full manual valvebody w/ compression braking, 34 element sprag, stock-stall TC, Art Carr cable shifter, B&M cooler, remote filter and a temp guage. Don't forsee the thing breaking anytime soon, which is good because I plan on beating the crap out of it. :grin:

    j
     

Share This Page