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.

What Tranny do i have? and what tcase?

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by 85blaze, Mar 30, 2000.

  1. 85blaze

    85blaze 1/2 ton status

    Joined:
    Feb 20, 2000
    Posts:
    117
    Likes Received:
    0
    Location:
    Corning NY
    Its an 85, came stock with a 305 in it... I am just wondering what its got, or what it came with, and how long it will hold up behind a built motor... ex. 400+hp and 420ftlbs... I don't really want my tranny to fall out to soon, its got 72000 miles..

    Blaze On ----- into the $$$ pit! Dang these things can cost ya alot!
     
  2. hpfire7227

    hpfire7227 Registered Member

    Joined:
    Mar 14, 2000
    Posts:
    75
    Likes Received:
    0
    Location:
    Holland Patent, NY
    If it's stock and unadulterated, then you have a turbo-hydramatic 700-R4 (TH700-R4)tranny, and a New Process 208 (NP208) t-case. And yes, these will stand up to 400hp, 450 ftlb.....for about a week of hard use.

    10 BOLTS O' FUN
     
  3. Boss

    Boss 1/2 ton status Author

    Joined:
    Feb 17, 2000
    Posts:
    2,550
    Likes Received:
    0
    Location:
    Maryland
    Is it manual or auto? If auto, is it a 3 speed or does it have OverDrive? If its a 3 speed, then you have the TH350. If it has OD, then you have the 700R4. I heard the early model 700R4 were very weak. Not sure when they corrected the problem, I have to do some research to find out, but the newer version are pretty sturdy and very popular b/c of the OD.
    Oh, and you have a NP208 chain driven t-case
    Boss
     
  4. 85blaze

    85blaze 1/2 ton status

    Joined:
    Feb 20, 2000
    Posts:
    117
    Likes Received:
    0
    Location:
    Corning NY
    Looks like I will be going EASY on it for about 4 months till summer rolls around and i can afford a new Jet. It must be the 700R4, because its got over drive... what would be a good tcase upgrade?

    Blaze On ----- into the $$$ pit! Dang these things can cost ya alot!
     
  5. Boss

    Boss 1/2 ton status Author

    Joined:
    Feb 17, 2000
    Posts:
    2,550
    Likes Received:
    0
    Location:
    Maryland
    the NP208 is a good tcase. But it is made of aluminum, so that makes it weaker, but lighter then the cast iron NP205 and NP203. The NP205 is the best upgrade I can think of. It is gear driven and is virtually bullet proof. If you can get your hands on one of those babys, go for it.
    Boss
     
  6. DangerB

    DangerB 1/2 ton status

    Joined:
    Feb 17, 2000
    Posts:
    420
    Likes Received:
    0
    Location:
    Frisco, TX.
    i THINK THE 3 SPEED AUTO THAT YEAR WAS A th400?
    oops, sorry bout the CAPS.

    DangerBrett[​IMG]
    <font color=blue>harder, faster, longer, stronger</font color=blue>
     
  7. Boss

    Boss 1/2 ton status Author

    Joined:
    Feb 17, 2000
    Posts:
    2,550
    Likes Received:
    0
    Location:
    Maryland
    you sure about that Danger B? I didn't think TH400's came in 1/2 ton rigs. I'm almost 99% sure that the 3 speed trans in 85 K5's were TH350s.
    Boss
     
  8. Crash90K5

    Crash90K5 Registered Member

    Joined:
    Feb 17, 2000
    Posts:
    84
    Likes Received:
    0
    Location:
    Santa Clara, CA.
    The only bummer with the 205 is the 2:1 low range. If you got extra $$ laying around, go for the Atlas II t-case. Is has a 3.7:1 OR a 4.3:1 low range. Great for multiplying those gears when you need the low range. It's all gear driven, so the internals are sturdy and it has an aluminum case. Personally, I'm looking at putting the Atlas II behind a NV-4500 manual. This is a 5 speed tranny with a granny low of 5.6:1 and an overdrive 0.7:1. Its reputation is a good all around tranny, giving both dependability, and efficiency. Haven't researched auto tranny options, but I suppose the 4L80E, but you would need to get the computer as it is electronically shifted. All of this is $$ The Atlas goes for over $2K and the NV-4500 is anywhere between $1300 and $2K. If you have the 700R4, you can rebuild that to the JET specs for a lot cheaper than they sell it for, if you do it yourself. I'm guessing you could pick up a rebuilt 205 for pretty cheap (someone on this board said they found one for $650) if you have a core.

    Hope I didn't confuse you,

    [​IMG] <font color=blue>Crash90K5</font color=blue> [​IMG]
     
  9. bad_bo_ti

    bad_bo_ti 1/2 ton status

    Joined:
    Feb 17, 2000
    Posts:
    1,027
    Likes Received:
    0
    Location:
    OhiO
    you guys have any identification techniques to tell what t-case you got, i know i have turbo 350 tranny, but i was jsut wondering if you knew what t-case, its in an 84 blazer, and how good are the turbo 350 trannys?
     
  10. Crash90K5

    Crash90K5 Registered Member

    Joined:
    Feb 17, 2000
    Posts:
    84
    Likes Received:
    0
    Location:
    Santa Clara, CA.
    Climb under your rig and look at the rear output side of the case. In the upper right corner should be a round tag that is colored red and silver. It should read NP-2nn (nn=03, 05, 08, 41, etc.)

    [​IMG] <font color=blue>Crash90K5</font color=blue> [​IMG]
     
  11. DangerB

    DangerB 1/2 ton status

    Joined:
    Feb 17, 2000
    Posts:
    420
    Likes Received:
    0
    Location:
    Frisco, TX.
    Good call Boss, the 400 was 3/4 and 1 ton. Ill pull my head out of my ass now.
    Bo_ti as far as identification
    the 203 is cast iron with aluminum covers
    the205 is all cast iron
    the 208 is all aluminum
    Right?


    DangerBrett[​IMG]
    <font color=blue>harder, faster, longer, stronger</font color=blue>
     
  12. DangerB

    DangerB 1/2 ton status

    Joined:
    Feb 17, 2000
    Posts:
    420
    Likes Received:
    0
    Location:
    Frisco, TX.
    Good call Boss, the 400 was 3/4 and 1 ton. Ill pull my head out of my ass now.
    Bo_ti as far as identification
    the 203 is cast iron with aluminum covers
    the205 is all cast iron
    the 208 is all aluminum
    Right?

    I beleive that in'85 the manual tranny had 205, auto had 208


    DangerBrett[​IMG]
    <font color=blue>harder, faster, longer, stronger</font color=blue>
     
  13. 85blaze

    85blaze 1/2 ton status

    Joined:
    Feb 20, 2000
    Posts:
    117
    Likes Received:
    0
    Location:
    Corning NY
    If the four speed isn't a 700R4 then what would it be?? I don't plan on being to rough on the truck, I am only in H School, I just need to shut some kids um when i stomp on the gas, if i do... and beat that dam 2000 pony car...

    Blaze On ----- into the $$$ pit! Dang these things can cost ya alot!
     
  14. Boss

    Boss 1/2 ton status Author

    Joined:
    Feb 17, 2000
    Posts:
    2,550
    Likes Received:
    0
    Location:
    Maryland
    the 4 speed is a 700R4.
    Boss
     
  15. 85blaze

    85blaze 1/2 ton status

    Joined:
    Feb 20, 2000
    Posts:
    117
    Likes Received:
    0
    Location:
    Corning NY
    Looks like the rebuild it yourself will be what fits my budget... I already have about 3 grand in it and its not even on the road yet... well it doesn't have hardly any body on it right now actually, arn't resto's fun?

    Blaze On ----- into the $$$ pit! Dang these things can cost ya alot!
     
  16. 85blaze

    85blaze 1/2 ton status

    Joined:
    Feb 20, 2000
    Posts:
    117
    Likes Received:
    0
    Location:
    Corning NY
    Sorry if i am being redundant but how stong are these 700's

    Blaze On ----- into the $$$ pit! Dang these things can cost ya alot!
     
  17. 6.2Blazer

    6.2Blazer 1/2 ton status

    Joined:
    Feb 24, 2000
    Posts:
    4,675
    Likes Received:
    26
    Location:
    Ohio
    If it's a stock 4 speed auto with O/D, I'm about 99.9% sure it would be a 700r4 for an '85 1/2 ton pickup. One thing I would recommend is to install an auxillary transmission cooler, and change the trans fluid while you're at it. Getting too hot will kill an auto tranny quicker then anything else.
     
  18. 85blaze

    85blaze 1/2 ton status

    Joined:
    Feb 20, 2000
    Posts:
    117
    Likes Received:
    0
    Location:
    Corning NY
    Thanks for the info guys, Sorry for the dumb Questions, I guess you would call me a sportruck convert... from the s10 scene to the 4x4 scene, mainly because of snow and well, i found a couple a good mud holes...

    Blaze On ----- into the $$$ pit! Dang these things can cost ya alot!
     

Share This Page