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TH700R4/NP208 Toasted/Upgrade NEEDED!!

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by Blazinit, Nov 26, 2001.

  1. Blazinit

    Blazinit Registered Member

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    I bought my '84 this summer (best thing I ever did), but the 4HI was out on the NP208, no problems, just run in 4LO until I got the money to replace it, well.....The TH700r4 took a turn for the worst this weekend and now I need to replace it as well. My thoughts are this...IF YOU HAVE TO REPLACE, WHY NOT UPGRADE? So this is my question for you folks, What do I upgrade to that is going to be strong (knowing that I will have to replace the 10 bolts eventually) and get me to where I want to go (freeway). Should I go with a TH350 and a NP205 or would that be too much of a hassle for what it's worth? Or should I stay with the 700r4 and upgrade the TC or stay the same and rebuild? HELP!!!
    <P ID="edit"><FONT class="small">Edited by Blazinit on 11/26/01 04:47 AM.</FONT></P>
     
  2. 89GMCSuburban

    89GMCSuburban 1/2 ton status

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    I'd go with rebuilding stock stuff. Least amount of questions and you know it will work. However, maybe get a TCI 700R4 for the 4wd. It'll be stronger than the one you have now. If you wanted a quality, cheap rebuild, I got a guy who'll rebuild the 700 for $450. Take it to him and he'll do it all. Problem is, he lives here in Texas... Anyway, I'm sure you could rebuild the TC yourself. It's not too hard if you follow instructions. The tranny, take it somewhere or get the TCI shipped tou your front door.

    Red 1989 GMC Suburban SLE V1500 - TBI 350, 700R4 w/ shift kit, Quad-shock front, 31/10.50/15 Pro Comp MT, 4.10 gears, Duals off cat
     
  3. Blazinit

    Blazinit Registered Member

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    Going with the stock would be OK, I checked out the TCI site and it gives no prices, does anyone know what a TCI 700r4 would run? Does anyone know where I could find instructions and a "kit" to rebuild the NP208?

    '84 K5 Blazer 4"Rancho w/Quad Diamond Backs 350/TH700r4/NP208/35" BFG AT/10 bolt F&R
    Washington, USA
     
  4. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    For the price of an aftermarket 700R4 (Raptor, TCI, Art Carr) you could swap in a TH350/NP205 and new driveshafts and plenty left over for beer. If I had to run a slushbox I'd take a TH350 over a 700R4...but I'd take a TH400 over any of them.

    Just my two cents...stock sucks.

    Rene

    <font color=green>Dyslexics of the world...UNTIE!</font color=green>
    <a target="_blank" href=http://coloradok5.com/gallery/project_T2> tRusty pics...</a>
     
  5. Chaz88K5

    Chaz88K5 1/2 ton status

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    i have a 700R4/208 converted to fixed yoke ill sell ya...the tranny has about 25000 on it and the T-case maybe 4000 on it...used only once at the blazer safari...I am in Lodi CA so depending where you are shipping may be a pain in the ass

    <font color=green>Chaz</font color=green>

    <a target="_blank" href=http://community.webshots.com/user/chaz88k5>http://community.webshots.com/user/chaz88k5</a>
     
  6. Mr.Chevy4x4

    Mr.Chevy4x4 1/2 ton status

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    I've had the same problem and I am tired of having 700r4 and NP208 problems so I am scrapping them and going with 400/205 combo. I'm tired of having reliability issues, something is always going to break and when it does it needs to be something I can fix on the trail.

    '85 K5 : Run it til it breaks, then fix it and go again!
     
  7. CaptCrunch

    CaptCrunch 1/2 ton status

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    I love the 700r4 if it is built right... Art Carr, Raptor, and TCI are all excellent ways to go for a daily driver. The 208 case is crap! The 241 really isn't much better, but for the right coin it can be made a fixed yoke. Unfortuently it is pretty tough to mate a 205 to a 700, but since you are getting the tranny talk to your tranny guy. You can change the tail shaft in the 700 to make a 205 from a th350 work so I hear. That would be the route to go. Otherwise if you have another vehicle for milage or it is mostly a trail only rig do as Rene said and go th400 and forget it!

    -Mikey
    1987 Chevy K5 Blazer- 350 TBI
    <a target="_blank" href=http://coloradok5.com/gallery/captcrunch>http://coloradok5.com/gallery/captcrunch</a>
     
  8. Blazinit

    Blazinit Registered Member

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    Thanks for all of your help folks, I really appreciate it!!! Consensus goes both ways, but I think that putting in the extra effort to convert to a 400/NP205 would be my best bet in the long run. Now the question is, what am I going to need and where am I going to find it? Is there anything that I need to take into considerations before I go and start in on this?

    '84 K5 Blazer 4"Rancho w/Quad Diamond Backs 350/TH700r4/NP208/35" BFG AT/10 bolt F&amp;R
    Washington, USA
     
  9. 55Willy

    55Willy 3/4 ton status

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    <blockquote><font class="small">In reply to:</font><hr>

    stock sucks

    <hr></blockquote>
    where did you get that idea...(look at my title),LOL I would go with a TH400 and NP205

    <font color=red>Life is like a mud hole:</font color=red><font color=blue>
    When the S#!T gets deep, you have to keep moving and friends can always pull you out</font color=blue>
    55 Willy's
     
  10. shawnboy

    shawnboy 1/2 ton status

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    Nothing wrong with the 700-208 combo. The 208 has a lower crawl ratio than a 205 and the overdrive on the 700 helps if you run tall gears. Advice on the 700, look for one from a 88 or newer because there have been upgrades from the factory in the newer ones that address certain issues that made the older ones" suck." If you are worried about or have been warned about the 208 not being able to stand up to being banged around while off roading use skid plates.
    Shawnboy.

    <font color=red>If you are having too much fun it's probably illegal.</font color=red>
     
  11. 89GMCSuburban

    89GMCSuburban 1/2 ton status

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    A TCI 700R4 for a 4wd costs $1,299 from Jeg's. They put in a higher strength type of clutch, add additional clutches to the 3-4 pack, improve oiling and modify the valve body. Supports up to 450 ft.lbs. of torque. A TCI 400 is $734.99 and a TCI 350 is $689.99. All prices plus shipping. My 89 700R4 has been VERY reliable for being in such a heavy truck.

    Red 1989 GMC Suburban SLE V1500 - TBI 350, 700R4 w/ shift kit, Quad-shock front, 31/10.50/15 Pro Comp MT, 4.10 gears, Duals off cat
     
  12. Blazer_Boy

    Blazer_Boy 1/2 ton status

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    <a target="_blank" href=http://cheap-cds.com/surf/play/35456ae.mp3>Stuck in ol' Lodi again, eh?</a>

    <a target="_blank" href=http://new.wavlist.com/movies/031/ag-blow.wav>"I ain't nobody, dork."</a>
    <a target="_blank" href=http://www.geocities.com/bigkern76>http://www.geocities.com/bigkern76</a>
     
  13. K10ANDYKHAMNIC

    K10ANDYKHAMNIC 1/2 ton status

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    208s are good ive never had a prob with mine , and plus i can convert mine and have done for about nothing ! hah dont bash my chit ! ;) its ok im not really offended it just an opinion like mine !



    dents ....
    O R D's axles
    NO BREAKAGE :)
     
  14. CaptCrunch

    CaptCrunch 1/2 ton status

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    How can you get the conversion done for nothing... it sounds like a PIA... and better yet when you gonna hook me up w/ the free conversion ??? [​IMG] LOL

    -Mikey
    1987 Chevy K5 Blazer- 350 TBI
    <a target="_blank" href=http://coloradok5.com/gallery/captcrunch>http://coloradok5.com/gallery/captcrunch</a>
     
  15. K10ANDYKHAMNIC

    K10ANDYKHAMNIC 1/2 ton status

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    my family owns a machine an welding shop , we everything repair new stuff yah dah yah dah theres nothing really to the conversion , machine a lil piece of alum rod to about 1 high by 5/8s id and 1" od get it tig weldded in place , my broken housing works great as a jig ;) and thats it and decide what output you wanna run , on the dodge ucan run a front shaft flange or whatever else u can come up with with 32 splines:)
    look at my pics page and youll see



    dents ....
    O R D's axles
    NO BREAKAGE :)
     
  16. CaptCrunch

    CaptCrunch 1/2 ton status

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    hmmm... cool. I have heard from a couple guys that have them that something had to be done or modifed on the case. Where is your pics page at?

    -Mikey
    1987 Chevy K5 Blazer- 350 TBI
    <a target="_blank" href=http://coloradok5.com/gallery/captcrunch>http://coloradok5.com/gallery/captcrunch</a>
     
  17. K10ANDYKHAMNIC

    K10ANDYKHAMNIC 1/2 ton status

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    <a target="_blank" href=http://www.imagestation.com/album/?id=4292257869>http://www.imagestation.com/album/?id=4292257869</a>



    dents ....
    O R D's axles
    NO BREAKAGE :)
     

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