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08-30-2018, 07:38 AM
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#1 |
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Registered User
 
Join Date: Aug 2013
Location: Atlanta, GA
Posts: 702
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Transmission Advice
I have a 1969 K20 with a 396, NP205, TH400. It has a 4" lift and I run 35's. It is not a garage queen and I use this truck and like the power and durability of what I have. I am now getting to a point where I want it more streetable without sacrificing the performance I have now. I was considering adding a gear vendors Over/Under Drive to the truck but now I am wondering if I might just be better off with a modern 4x4 transmission with overdrive. I want something that is tough and will stand up to off road but still allow me to take a long road trip without breaking the bank on fuel.
What advice do you have for me on this? I want something that can stand up to 450 - 500 HP and the torque requirements. What transmission/what do I need to convert over, etc. All opinions welcome and thanks in advance.
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1968 C10 292/3 spd - sold 1969 K10 350/3 spd/205 - sold 1971 K5 350/4 spd/ 205 - sold 1970 K20 350/350/205 - sold 1969 K20 396/400/205 - work in process |
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08-30-2018, 09:56 AM
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#2 |
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Registered User
Join Date: Dec 2011
Location: Yuma Arizona
Posts: 1,525
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Re: Transmission Advice
4l80e or nv4500.The gear vendors isn't cheap and your still left with a non-lockup transmission, although it would be the easiest to install.
Cheap-reliable-easy: you can pick two. Decisions decisions. |
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08-30-2018, 10:58 AM
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#3 |
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Senior Member
Join Date: May 2004
Location: Binghamton, NY
Posts: 3,469
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Re: Transmission Advice
4l80. Can be bought relatively cheap, and the controllers are cheaper now too. Plus not overly difficult to hook up to a 205.
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08-30-2018, 11:16 AM
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#4 |
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Registered User
Join Date: May 2012
Location: horseheads,ny rust belt
Posts: 2,794
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Re: Transmission Advice
4l80-e if you like auto . since you have a th400/205 your 205 should be 32 spline input . fairly easy to get adaptor for .
then look here for a great controler unit . www.usshift.com you want the quick 4 unit for the 4l80-e
__________________
77-k30lb BIG truck build . 87-k30lb budget beater build . 85-k30lb the plow machine build . 85-c10sb summer fun toy . ----------------------------- HOLLEY SNIPER efi = worst case of p.i.t.a i ever had . EDELBROCK pro flo 4 = best deal going so far . love my setup works great. |
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08-30-2018, 07:01 PM
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#5 |
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Registered User
Join Date: Aug 2013
Location: Atlanta, GA
Posts: 702
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Re: Transmission Advice
Thanks Guly!!! I like the auto. Will I still be able to run my stock speedo with this set up?
__________________
1968 C10 292/3 spd - sold 1969 K10 350/3 spd/205 - sold 1971 K5 350/4 spd/ 205 - sold 1970 K20 350/350/205 - sold 1969 K20 396/400/205 - work in process |
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08-30-2018, 09:08 PM
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#6 | |
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Registered User
Join Date: May 2012
Location: horseheads,ny rust belt
Posts: 2,794
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Re: Transmission Advice
Quote:
lots of guys do a 2wd 4l80 to use the speed sensors in the trans and keep the 205 cable drive . others do the 4wd trans and modify the rear t-case output for vss sensor to let the controler shift correctly in 4w low . some add in a cable signal transducer and piggy back the cable on that still . www.offroaddesign.com offeres the vss sensor mod option if you go that route .
__________________
77-k30lb BIG truck build . 87-k30lb budget beater build . 85-k30lb the plow machine build . 85-c10sb summer fun toy . ----------------------------- HOLLEY SNIPER efi = worst case of p.i.t.a i ever had . EDELBROCK pro flo 4 = best deal going so far . love my setup works great. |
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