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.

400/205 vs. 465/205

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by KRAZIE87K5, Sep 22, 2001.

  1. KRAZIE87K5

    KRAZIE87K5 1/2 ton status

    Joined:
    Feb 23, 2001
    Posts:
    3,369
    Likes Received:
    0
    Location:
    Chicago, IL
    What kinda trouble am I asking for if I think about converting from my existing TH400/NP205 combo to a SM465/205?

    *will I have to change drive shaft lengths?
    *how much trouble is it to install the clutch pedal, hydro stuff, etc to make this thing happen?

    I know someone of the crazy folks out here has done this... My TH400 is acting up, and I am looking at $1000 at Ammco to have it fixed. If I can get the SM465/205 combo done for the same price (COMPLETELY FINISHED) then I am all over it.

    <font color=red>Just give me a tank, and point me in the right direction!</font color=red>
    <font color=blue>DONT MESS WITH AMERICA!</font color=blue>
    454/TH400/NP205 - 14BFF/D60/w/ 4.10s
     
  2. michaelm

    michaelm 1/2 ton status

    Joined:
    Feb 2, 2001
    Posts:
    872
    Likes Received:
    0
    what year is the truck?
    do you have basic mech ability and tools?
    your tranny/trancase is a valuable commodity and you should be able to trade plus cash for a manual setup. if your cab is 85+ all the places you need to drill are premarked. i have a detailed list of part #s required but the wreckers is the best place to get the clutch pedals, get the whole assembly brake and clutch pedals plus the pivot mounting pieces, master and slave and bellhousing. you have to pull your brake booster off to get to where you drill, you have to drop your steering column to change the pedal assembly out. nothing hard, but any job will have its snags(such as all metric fasteners), a bit time consuming. BTDT i love the hydro setup over the z bar junk
     
  3. KRAZIE87K5

    KRAZIE87K5 1/2 ton status

    Joined:
    Feb 23, 2001
    Posts:
    3,369
    Likes Received:
    0
    Location:
    Chicago, IL
    Yeah I know my TH400 and NP205 still are worth some coin... But I am more concerned with what will exactly have to be done. IE steering column replacement? Length of the SM465/NP205 vs. the TH400/NP205? I just put this thing together, and the driveshafts are new and fit for the current setup.

    I think the truck had a manual trans in it at one time, the hoe in the floor (shifter) and firewall (hydro) were open when I bought the rolling chassis. Would this make the job any easier? Am i just crazy for thinking about going to the SM465 - should I stay with the TH400 I have already?

    I use my truck 90% mud, and 10% climbing. Stop me if I am doing the wrong thing here...

    <font color=red>Just give me a tank, and point me in the right direction!</font color=red>
    <font color=blue>DONT MESS WITH AMERICA!</font color=blue>
    454/TH400/NP205 - 14BFF/D60/w/ 4.10s
     
  4. Grim-Reaper

    Grim-Reaper 3/4 ton status Author

    Joined:
    Feb 17, 2000
    Posts:
    7,385
    Likes Received:
    0
    Location:
    Atlanta
    It's all bolt in. Just need to get the parts off a doaner truck and bolt them in. THe peddle assembly is a peice of cake. Just pull the bottom bolts loose from the brake booster. take the bolts loose form the steerin column. Now the truck I got my parts fron had the column out and I havent installed them in my truck yet but I'm pretty sure you need to pull the column loose. Sounds worse than it is. just a couple colts up at the dash. couple plugs and a couple bolts at the floor and take the rag joint loose.
    SCREW AMMCO!. Find the local non chain shop that has new set of cars in the parking lot every day. That guy will probably rebuild your TH400 for $300-400 if you pull it out.

    I don't need no damn shop manual, I got a pornographic memory.
    <a target="_blank" href=http://communities.msn.com/OffroadK5s>communities.msn.com/OffroadK5s</a>
    75 Jimmy, Dollar
    Grim-Reaper
     
  5. KRAZIE87K5

    KRAZIE87K5 1/2 ton status

    Joined:
    Feb 23, 2001
    Posts:
    3,369
    Likes Received:
    0
    Location:
    Chicago, IL
    So the SM465/np205 combo will be the same length as the Th400/NP205 combo?!!! That is kick @$$! Having a stick in the Blazer would be awesome!

    What kinda gearing differences will I experience with the SM465? (sounding stupid AGAIN) Its a four speed right? I could use that as an excuse with the wife to IMPROVE GAS MILEAGE!!! This sounds like it might work...

    So, just to be absolutly sure, the driveshaft length will not have to be changed to install the 465/205 t&amp;t right?

    Oh yeah - I have a 454 in this truck... the 465 is just as tough as the TH400 right? I can't afford to get anything weaker. i smoked a TH350, and now the TH400 is acting funny...

    ANYONE WANT TO TRADE A TH400/NP205 combo for a SM465/NP205?

    <font color=red>Just give me a tank, and point me in the right direction!</font color=red>
    <font color=blue>DONT MESS WITH AMERICA!</font color=blue>
    454/TH400/NP205 - 14BFF/D60/w/ 4.10s
     
  6. michaelm

    michaelm 1/2 ton status

    Joined:
    Feb 2, 2001
    Posts:
    872
    Likes Received:
    0
    doubt the shafts are the same....the 465 is way tougher than a T400.
     
  7. mudddog91

    mudddog91 1/2 ton status

    Joined:
    Dec 28, 2000
    Posts:
    471
    Likes Received:
    0
    Location:
    north carolina
    YA THE 465 RULES and is way tougher than a th400 plus you get the wonderful "granny" gear!
     
  8. 84_Chevy_K10

    84_Chevy_K10 Banned

    Joined:
    May 30, 2001
    Posts:
    17,669
    Likes Received:
    0
    Location:
    IL, USA
    Sorry, the SM 465 is WAY shorter than a TH 400. I'm swapping my truck from 700R4/208 to SM 465/NP205. My friend swapped his TH 350/NP 203 combo out for the same, so did another one of my friends with a TH 400/NP 203.

    Total I think I'm going to be around $500 for the swap, with a new clutch after what I payed for the tranny/xfer.

    Around here it's $200 to get a TH 400 rebuilt if you pull it yourself, though.

    You probably won't get any better gas mileage with an SM 465. The top gear is still 1:1, but it doesn't have a torque converter slipping all the time, so you'll lower your cruise RPM a bit.

    Tim
    '84 Chevy K10, lifted, loud, fast, and 3/4 ton axles
     
  9. thatK30guy

    thatK30guy 1 ton status Premium Member

    Joined:
    Jan 12, 2001
    Posts:
    32,076
    Likes Received:
    55
    Location:
    .
    Yes, the 465 is stronger than the 400.

    The 465/205 combo is a little shorter than the 400/205 combo.

    I believe both driveshafts will need lengthening or shortening.

    You will gain more power from your motor with using the 465 because the 400 takes a little more horsepower to turn the tranny over.

    I have a 465/205 with a fixed yoke to swap with you if you are interested. PM me for more details.

    <font color=red>I'm a "black top mudder"!!!</font color=red>

    <a target="_blank" href=http://coloradok5.com/gallery/thatK30guy>http://coloradok5.com/gallery/thatK30guy</a>
     

Share This Page