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#1 |
Registered User
Join Date: Mar 2011
Location: Brandon,Iowa
Posts: 391
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72 K20 4speed to 700R4 swap questions
I am thinking about swapping my truck (K20) from the 4 speed trans to a 700R4 overdrive. From what I understand, the 4 speed 205 transfer case has a different input shaft than the automatic TH350 version.
I have an 84 K20 that has, I believe,the 208 TC . I have an adaptor for the 208-700R4,, and I have a 4x4 700R4. Has anyone done this swap ? Would I be better off finding an automatic 205 TC ? I believe I still need an adaptor to go from the 700 to the 205 correct ? I'm looking for ideas and input !! All reasonable suggestions are welcome !! My ultimate goal is to have an automatic and soften the 4:10's with an overdrive !! Have a great day everyone !! Tom |
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#2 |
Senior Member
![]() Join Date: Oct 2009
Location: Godley, TX
Posts: 17,962
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Re: 72 K20 4speed to 700R4 swap questions
This is a great question, and I've only seen it before when replacing an automatic, but you pose a new twist when going from the 4-speed. You will need to replace the output of the 700R4, at a minimum - and then ensure it will mate to the 205. I believe there are a few things to consider -
engine may need to be approx 2" fwd of where it was stock (even with the adapter installed) - have read (although can't find it for a reference) that moving motor mount rear hole to the fwd motor mount hole works about right (and then re-drill for forward holes. But someone should confirm before drillin away... But, this is doable. Good question about the 4-speed transfer case vs TH350/700R4 t-case. I don't know - hopefully someone knows that one on here. BUT, here's what I'd do: Call advance Adapters and tell them exactly what you're doing - Replacing factory 4-speed woth 700R4 and mating it to the NP205 tc. It might require more than 1 kit, but might not. They will know what to do - EXCELLENT customer service to boot. Advance Adapters adapter kit page(s): http://www.advanceadapters.com/categ...pter-kits/191/ Advance adapters OEM page: http://www.advanceadapters.com/categ...equipment/192/ a useful site thread: http://67-72chevytrucks.com/vboard/s...d.php?t=495513 |
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#3 |
Registered User
Join Date: Mar 2011
Location: Brandon,Iowa
Posts: 391
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Re: 72 K20 4speed to 700R4 swap questions
Jocko
Thanks for the links !! I will research them in the next few days as time allows !! I found this thread, Post #8 describes the different input shafts. http://67-72chevytrucks.com/vboard/s...+transfer+case I'm going to look into the 700R4/208 Combo,,, still learning !!! Keep the comments and info coming !!! Take care all !!! Tom |
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#4 |
Registered User
![]() Join Date: Apr 2012
Location: So. Florida
Posts: 873
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Re: 72 K20 4speed to 700R4 swap questions
Checkout BowTie overdrives. Great info there.
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#5 |
Registered User
![]() Join Date: May 2005
Location: Blackfalds, Alberta
Posts: 585
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Re: 72 K20 4speed to 700R4 swap questions
This thread should have some useful information:
http://67-72chevytrucks.com/vboard/s...79#post5559379
__________________
1971 Chevrolet K10 - SWB, 5.3LS, 4L60e 1970 Chevrolet K5 Blazer - Project 1969 Chevrolet C10 - SWB, 350 Holley Sniper, 700r4 1969 GMC Suburban - 5.3 LS, 4L60e |
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