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crossmember fitment for 465 swap

Discussion in 'The Garage' started by az ranger, Feb 23, 2005.

  1. az ranger

    az ranger 1/2 ton status

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    I am going from 700r4 w/NP208 to the 465 with same 208 transfer case. does any body know if the stock crossmember will still bolt in the same place or will I need to modify it.

    Thanks
     
  2. supersize75k5

    supersize75k5 OrganDonorRacing.com

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    interesting

    now I am curious
    :confused:
     
  3. sled_dog

    sled_dog 1 ton status

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    You can't go to a 465 with 208 combo from 700R4-208 and reuse the 208 without replacing the input gear. The 208 has a 27 spline input gear. The 465 is either 10 spline or 32 spline.(32 spline was the factory setup with a 208 behind a 465) As for the crossmember, there are a bunch of different crossmembers with a bunch of different setups, so I can't say on that. I replaced a 700R4 with a 465 and used the same frame mounting holes
    I couldn't reuse the crossmember, it wouldn't have bolted to the 465 I had. However my 1989 Suburban had a different adapter on the 465 that was the same as the 700R4 I had replaced once before, so there I could have used the crossmember.
     
  4. dyeager535

    dyeager535 1 ton status Premium Member

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    After about '85, there were only two crossmembers used. (double hump and single hump as I call them. Previous there was a flat one with the "tall" adapter) The length of the adapter/transmission is what governs where it bolts in.

    My frame was an '81, had to drill the frame for an early 465/205 combo. After '85 the adapter length changed 465/205 and again I have to redrill.

    Basically, all you need to do is measure the overall length of the tranny to the mounting point for the adapter.
     
  5. sled_dog

    sled_dog 1 ton status

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    mounting point from bellhousing to adapter mounting point on any 32 spline 465 will be the same as the 700R4. I've measured and checked that before. When I replaced the 700R4 with 465 the flat(84) crossmember bolted right to the 700R4 holes in the frame. When I replaced the 89 "single hump" crossmember with the flat one I had to drill new holes. Actually I just slotted the crossmember holes instead of trying to drill new holes in the frame from underneath the rig.

    A short(85+) 465 to 208 adapter should bolt in place of a 700R4. I have not done it so I'm only like 90% on that one.
     
  6. az ranger

    az ranger 1/2 ton status

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    i am replacing the 208 input gear for the 32 spline I ihave the adapter to mount the long 32 spline output 465 to the 208 I have not actually measured it yet but I am pretty sure it will be the same length as the 700r4 to 208 that was in there. I figured since it was the same length the crossmember should go back in with out any trouble. if not which one do I need.

    thanks
     
  7. sled_dog

    sled_dog 1 ton status

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    if you have the tall adapter you will need this crossmember. Its flat besides that dip down. Thats what I have in my burb. The shorter adapter will likely work with the 700R4 mount. I'm not 100% on that though.
     
  8. big4x4ride

    big4x4ride 1/2 ton status

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    i just did a 465/208 swap in my 79 Jimmy, it had a 700r4/np208, used the same crossmember and the same mounting holes
     

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