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Trans Selection

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by jaybird, Nov 16, 2001.

  1. jaybird

    jaybird Registered Member

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    Arlington, Texas
    I've got a 79 Jimmy with a 454, 700r4, NP205, D44, and Corp 14 Bolt. The engine is putting out 400 - 450 ft lbs of torque and seems to over power the trans during hard acceleration. This trans has a shift kit, and higher stall convertor. Should I get another 700r4 or go for a TH400.

    Jay VT
    79 Jimmy 454,D44, 14 bolt, 38's
     
  2. Thunder

    Thunder 3/4 ton status

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    I think you should go with the TH 400 unless having the overdrive is a major issue with you. The TH 400 will hold up better behind a big block, and are a lot cheaper to build and buy. But if you want to stick with the 700r4 heres a couple of places that can build a tranny that can handle a 454.
    <a target="_blank" href=http://www.transmissioncenter.net/highperflist.htm>Raptor transmissions.</a>

    <a target="_blank" href=http://jetchip.com/transmissions/700r4trans.cfm>jet transmissions</a>

    <a target="_blank" href=http://coloradok5.com/gallery/Thunders-Blaze>http://coloradok5.com/gallery/Thunders-Blaze</a>
    <font color=blue>NEVADA: Where the pavement ends, and the West begins.</font color=blue>
     
  3. BadDog

    BadDog SOL Staff Member Super Moderator Author

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    With that much torque, I would go TH400. However, I have successfully run a mildly built up TH350 behind a mild 454 (similar to yours, maybe a little more) Blazer on 35s. I ran it because it was already there and it didn't give me any trouble. If I had put it together, I would have installed a TH400. They are really hard to beat for strength and abuse. However, the previous owner of said 454 Blazer chose the TH350 due to less parasitic power loss than the TH400.

    Or, if you want OD and are more adventurous (with more $$$), go 480LE. Seems like I saw a kit to put the electronic trannies in older trucks somewhere but I don't know where it was. Painless maybe?

    Russ

    85 K30 CUCV, 350 TBI, TH400, 205, D60/C14, 4.56 Locked
    Some day: 4" lift, 44" tires, massive cutting, shorter wb and rear overhang.
     
  4. michaelm

    michaelm 1/2 ton status

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    trans choices boil down to a sm465 or nv4500
     
  5. jekbrown

    jekbrown I am CK5 Premium Member GMOTM Winner Author

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    If you wanna keep your overdrive, you might look into getting a beefy 700R4. I am about to install PATC's version of the 700R4, the Raptor this coming week. I think the www addy is...

    www.transmissioncenter.net

    They have all the details on it listed, what HD parts they have used etc. Peeps here at CK5 that have dealt with them (ie not just ordering, but repairs, warranty issues, and rebuilds) seem to dig their customer service too. The Raptor runs around $1500. A no brainer for me, since a couple of trans shops were quoting me $1k just rebuild my crappy old 700R4 with regular old plain-jane parts. As if! ;)

    BTW, if you get one during november, you get a free t-shirt and your choice of a deep trans oil pan or an oil cooler. Not bad. =)

    J


    See the on-going build up of my '85 Jimmy! http://community.webshots.com/user/jekbrown
     
  6. BadDog

    BadDog SOL Staff Member Super Moderator Author

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    Maybe it is just me, but I can't see putting that kind of money into a 700R4. For that kind of money and wanting OD, I would be looking into the 480LE. Actually, I expect you could get the 480 for quite a bit less than $1500 including the extra stuff for the conversion. Of course that is just a guess, I've never looked that far into it since I have never been cursed with a 700R4 (although I've seen plenty of others cursing it).

    Russ

    85 K30 CUCV, 350 TBI, TH400, 205, D60/C14, 4.56 Locked
    Some day: 4" lift, 44" tires, massive cutting, shorter wb and rear overhang.
     
  7. Stephen

    Stephen 1/2 ton status Moderator Vendor

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    I have an Art Carr behind my 468, I do have a couple of secret weapons though, one is altitude, I run a lot over 5Kft, and a good bit over 3500, so I lose motor power. And the trans has some good beefy parts like a new sun gear shell, etc so they rate it for 700HP. It's not cheap, but a big part of the price of my trans was the new sun shell and the manual valvebody.
    I had a really tough time deciding between the TH700 and a TH400, but by the time I added the low gear to the TH400 along with the manual VB it was close to the same price as a TH400, so I took the OD gear and ran with it.

    Making the world better, one truck at a time.
    SW-ORD
    <a target="_blank" href=http://www.offroaddesign.com>www.offroaddesign.com</a>
     

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