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Engine/trans swap for 86 Blazer Question

Discussion in 'The Garage' started by nascardude18, Feb 5, 2006.

  1. nascardude18

    nascardude18 Registered Member

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    Hello, I am from Canada, New Brunswick. I am getting ready to swap out a engine for a fresh 350 stock rebuilt and a 400 turbo transmission as well. The orginal trans is still in the truck, It was a auto- overdrive(still in the truck) and was bolted up to a 305 cid when I first got it. My question is, how much different is the other trans to the 400 turbo. I was told that it may be longer and have to make my drive shaft shorter. I have a 4 inch lift kit for suspension installed and my rear drive shaft is a touch short as it is. Is the 400 trans a bit longer then the stock 350 trans that came with the 86 Blazer full size?. I am also wondering if the transfercase is going to make a big difference as well. Any help would be great.Thanks
     
  2. u2slow

    u2slow 1/2 ton status

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    If you are going from a TH350/NP208 or TH700/NP208 to a TH400/NP208, the lengths stay the same.

    But, a TH350 in a '86 4x4 doesn't sound stock... makes me wonder if you have a t-case other than the 208. :thinking:
     
  3. nascardude18

    nascardude18 Registered Member

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    How can I find out what I have , I am fairly upto par with mechanics, It has the over drive in it.Not sure where I can find that information, on the truck.So I guess I will have to find out what transfercase I have and what trans as well.What I know at this point is, It's a silverado K5 86 blazer, it had a 305 engine with polition control, now gone lol, any help would be great thanks... I will check on line for more info...
     
  4. nascardude18

    nascardude18 Registered Member

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    Does anyone have a blazer setup like I do, I was told it prob has a t-case trans case.My question is will the transmission fit up to the transfercase? or will it be longer or wider?Any help would be great .
     
  5. bigbadchev84

    bigbadchev84 1/2 ton status

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    i did the exact same swap as you did with no modifications, its a bolt up and go, i believe they are the exact same lenth it is the adaptor that determines the overall length. it sounds like you have a 700r4/208 combo. were you planing on using the same t-case with the new 400? or does it have a different one?
     
  6. bear76

    bear76 1/2 ton status

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    My LMC catalog helped me identify everything, best use for it so far.
     

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