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Another tranny thread (I know, I should have this all figured out by now)

Discussion in 'The Garage' started by bigredblzr, Apr 5, 2004.

  1. bigredblzr

    bigredblzr 1/2 ton status

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    So I went to Pick N Pull today in pursuit of a new 700r4. I only found 1 700r4 that was outta a 1/2 ton 4wd, and that truck had a fried motor, so I figured that it very possibly may have damaged the tranny as well. However I did see several 4wd S-10 Blazers with 700r4s, but didn't check to see how many of them were the 4.3L or the 2. something L. I called a Chevy dealership and asked them if the tranny from the S-10 Blazer was compatible, they said no. So I went to Napa and asked the guy there, and he said no because they had different bell housings. I called AMMCO and asked a guy there if the S-10 Blazer tranny and the K5 Blazer tranny were compatable, and he said no also because of the bell housing. However, I have heard from two other private sources that the 4.3L S-10 700r4 will work for a 5.7L Blazer. The 4.3L is just a chopped 350 block right? So why would the bell housings be all that different? If the bell housings are different, is there any way to swap them out for the one off my 5.7L- 700r4?
    Thanks,
    Nate
     
  2. big83chevy4x4

    big83chevy4x4 3/4 ton status

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    as long as they came from a 4.3l it will bolt up to the 350. you can't swap bellhousings because they are cast into the case.
     
  3. bigredblzr

    bigredblzr 1/2 ton status

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    So the fact that I mis-spoke when I talked to the people stated above and I failed to mention whether or not it was a 4.3L makes that big of a difference? It makes sense to me, but I woulda thought that people with those professions woulda asked me about what size S-10. BTW, how do you know all this usful tranny stuff? Have you performed a similar swap? Thanks AGAIN! /forums/images/graemlins/thumb.gif
     
  4. big83chevy4x4

    big83chevy4x4 3/4 ton status

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    the 4cyl and small v6 have a small bellhousing and the 4.3 and all v8 have a big bellhousing. i rebuild transmissions /forums/images/graemlins/waytogo.gif
     
  5. bigredblzr

    bigredblzr 1/2 ton status

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    Ah ha, I thought you did something along those lines. What about the strength of the 4.3L 700r4? Is it as strong as a 700r4 from a 5.7L? Does it have the same gear ratios?
     
  6. 84gmcjimmy

    84gmcjimmy 1 ton status

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    Since you rebuild tranny's you should no this, I don't, maybe im just... challenged /forums/images/graemlins/eek.gif What is the strongest automatic tranny? Thanks
     
  7. bigredblzr

    bigredblzr 1/2 ton status

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    I think the strongest from Chevy is the th400, though I'm prolly wrong... /forums/images/graemlins/ignore.gif
     
  8. big83chevy4x4

    big83chevy4x4 3/4 ton status

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    4l80e or an allison
     
  9. big83chevy4x4

    big83chevy4x4 3/4 ton status

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    yep same ratios. the strength really depends on the year more than the motor. the 700r4 got stronger the newer they are. the 4.3 trannys use the same parts as the 350 trannys.
    usually, the less power you have, the longer it'll last.
     
  10. bigredblzr

    bigredblzr 1/2 ton status

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    That's exactly what I was thinking today! That it would be much better to pull a 700r4 from a S-10 than from a k5 or other 1/2 ton because it would have seen less stress. Thanks a ton!
     
  11. bigredblzr

    bigredblzr 1/2 ton status

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    Also, would the fact that the 4.3L 700r4 has a np231 t-case behind it be a problem?
     
  12. 84_Chevy_K10

    84_Chevy_K10 Banned

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    [ QUOTE ]
    Also, would the fact that the 4.3L 700r4 has a np231 t-case behind it be a problem?

    [/ QUOTE ]

    No, all 700R4s are 27 spline output. Extract that trash and bolt up your transfer case and you're good to go. /forums/images/graemlins/rotfl.gif /forums/images/graemlins/thumb.gif
     
  13. bigredblzr

    bigredblzr 1/2 ton status

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    Thanks guys! I'm gonna pull a tranny tomorrow and get my Blazer back on the road(and off road)!;)
     
  14. testpilot

    testpilot Newbie

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    the 4.3 will have less clutches(reverse drum and 3-4 pack)... weaker 1-2 2-3 and servo springs ... may not handle the added power of the 350 to long and the shift will be softer....
     

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