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K30 w/hydroboost clutch pedal solution

Discussion in 'Manual Transmission & Clutch' started by Frankenchevy, Oct 18, 2020.

  1. Frankenchevy

    Frankenchevy Lying Dog-Faced Pony Soldier

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    Not sure until I pull the th400/208 apart. My 4500 will be here Tuesday. I’ll be able to better wrap my head around it then. I’ll be diving in next week. Just some prep this weekend, might pull the 400/208...

    I’m going to weld up a crossmember to avoid the 4” block spacer. Seems like a better idea than plopping a chunk of 4” box tubing on top of the existing flat crossmember.
     
  2. TubeTruck

    TubeTruck I like anything fast enough to do something stupid

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    Part of the reason I like my Suburban. The seats sit back further. I'm 6'2" and wear a 34-36" inseam but I feel like there is so much more room in the Suburban. I just need a tilt column and I'm set.
     
  3. SquareRoot

    SquareRoot Full Access Member

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    Ok, just in. I just verified measurements on the over length of my th400 to the mounting face of the 208. It is 26 3/8th which is EXACTLY the same as the NV4500/4wd adapter sitting in my garage.

    Also, the trans mounting location for/aft is exactly the same. Not sure about the height location, it may need a spacer once I get it under the truck.

    So, I'm gonna do this conversion in two stages. I'll swap pedal assembly, hydro boost and trans first. Leaving the 208 in so I'll be able to drive it until I'm ready to swap the 205/twin-stick stuff a little later.
     
    Last edited: Oct 31, 2020
  4. Frankenchevy

    Frankenchevy Lying Dog-Faced Pony Soldier

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    So your NV 4500 has a four-wheel-drive adapter? Everything I’ve seen, Which admittedly isn’t much, the 208 bolts directly to the back of the transmission with no adapter.
     
  5. SquareRoot

    SquareRoot Full Access Member

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    They all have an adapter unless it's a 2wd version with a slip yoke.
     
  6. Frankenchevy

    Frankenchevy Lying Dog-Faced Pony Soldier

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    Hmm, I got a 96 and up four-wheel-drive transmission from advance adapters and their bell housing. They told me that I bolt my 208 directly to the back of the NV 4500. Like I said, I guess I will be able to make better heads and tails of it once I have all the pieces in front of me.

    edit: I see what you’re talking about now. I stand corrected. What was tripping me up is them saying to remove the adapter, but that’s referring to the pedestal adapter for the 400...
     
    Last edited: Oct 31, 2020
  7. SquareRoot

    SquareRoot Full Access Member

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    Yup. That's correct. Just like mine. The tail housing (adapter) comes in 3 configurations. They're all 6 bolt round pattern. Bolt her up and go. IMG_20201031_140357741_HDR_copy_2000x1500.jpg
     
  8. Frankenchevy

    Frankenchevy Lying Dog-Faced Pony Soldier

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    Nice! 95 & down right?
     
  9. AuroraGirl

    AuroraGirl Supporting Member Supporting Member

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    Those studs on the bracket for hte pedals.. how come some trucks have 4, some have 2? its the brake pedal part that reinforces against the firewall/booster area.
     
  10. Frankenchevy

    Frankenchevy Lying Dog-Faced Pony Soldier

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    Hydro boost have 2 more studs coming from the engine bay side, so the pedals only have the other two out of four.
     
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  11. SquareRoot

    SquareRoot Full Access Member

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    They all have 4. It's just that ones with two have the missing two pressed in from the other direction. I think it's so you don't try to get them mixed up because the brake rod and clutch rod have different lengths and geometry.
     
  12. SquareRoot

    SquareRoot Full Access Member

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    Got my vacuum booster out. What a pain in the ass! And yep, the whole instrument panel and guage pod had to come out. And insult to injury, the steering column has to come out. You can't get the pedal assembly in or out with the pedals attached otherwise.
     
  13. SquareRoot

    SquareRoot Full Access Member

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    Ya. I got two of them. Ones a spare that needs rebuilt. Some nimrod ran regular gear oil in it.
     
  14. SquareRoot

    SquareRoot Full Access Member

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    Here's the other side of the firewall. Just pulled the vac an hour ago. The hydro boost has two studs pressed in from the engine side. I noticed the casting won't allow for a flanged nut to clear so they pressed studs in with small diameter heads. You just have to crawl under the dash to find the nuts instead of bending over the fender. IMG_20201031_182057425~2_copy_2000x1500.jpg
     
  15. Slybeanx

    Slybeanx Full Access Member

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    Glad I found your thread while digging through manual swap stuff. Looking to find all the parts to throw an AR5 in mine.
     
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