Author Topic: Need advice for 86 1/2 ton K10  (Read 1609 times)

Offline louder50

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Need advice for 86 1/2 ton K10
« on: April 12, 2024, 05:20:21 AM »
I bought an 86 1/2 ton K10 with no drivetrain other than the front and rear 3.43 axles. It came originally with a v6 and 4 speed manual trans. I have a rebuilt 350 to install but I don't know what to do about a trans and transfer case. I'd like to be able to drive it on the freeway and am thinking a 700r4 would be good. I'm not off roading it just a year round driver in Michigan. If I put a 4 speed manual back in it I don't think it would be good on the freeway but am I wrong? What would I need for 700r4 swap?

Offline VileZambonie

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Re: Need advice for 86 1/2 ton K10
« Reply #1 on: April 12, 2024, 07:06:23 AM »
700R4/NP208 is an easy find and good fit. Find someone parting out, junkyard or buy a parts truck and you'll get all you need.
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74 GMC, 75 K5, 84 GMC, 85 K20, 86 k20, 79 K10

Offline louder50

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Re: Need advice for 86 1/2 ton K10
« Reply #2 on: April 12, 2024, 05:00:29 PM »
Should I even consider just finding a sm465 and np205 and putting it back to what it was? With 4th gear being 1:1 and 3.43 gears could it keep up in the expressway?

Offline VileZambonie

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Re: Need advice for 86 1/2 ton K10
« Reply #3 on: April 12, 2024, 05:52:30 PM »
Keep up? Depends where you live and if everyone drives slow  :D Where I live you get tailgated at 95MPH on the highway so school bus trans isn't exactly the best option for that. The 465 is old school and good around town. Not made for today's crazy highway driving.
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              ⌠ŻŻŻŻŻ'   [☼===☼]
              `()_);-;()_)--o--)_)

74 GMC, 75 K5, 84 GMC, 85 K20, 86 k20, 79 K10

Offline louder50

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Re: Need advice for 86 1/2 ton K10
« Reply #4 on: April 12, 2024, 06:35:00 PM »
Thank you I appreciate the info

Offline philo_beddoe

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Re: Need advice for 86 1/2 ton K10
« Reply #5 on: May 22, 2024, 04:40:58 PM »
Keep up? Depends where you live and if everyone drives slow  :D Where I live you get tailgated at 95MPH on the highway so school bus trans isn't exactly the best option for that. The 465 is old school and good around town. Not made for today's crazy highway driving.
No kidding! I drive an unmarked cruiser, not that you can’t tell what it is, at 80 people are on my rear end! Unbelievable, some nerve people have. I’m not local or state, so we don’t pull people over, but THEY don’t know that!
Behold, the day of the LORD cometh, and thy spoil shall be divided in the midst of thee.  Zechariah 14:1

Offline VileZambonie

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Re: Need advice for 86 1/2 ton K10
« Reply #6 on: June 08, 2024, 06:16:32 PM »
Most of them are unregistered, uninsured, and don't pull over...
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74 GMC, 75 K5, 84 GMC, 85 K20, 86 k20, 79 K10

Online Shifty

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Re: Need advice for 86 1/2 ton K10
« Reply #7 on: June 10, 2024, 09:38:37 AM »
I'm thinking one of those 10-speed autos, a Gear Vendor, and a mid-2.5 rear gear....if I can get it going around 120, I might be able to pace the traffic on my daily commute.... :o

I swear folks think it's the Bonneville Salt Flats out there....
87 V20 Standard Cab Longbed (current)

87 R30 3+3 Longbed (days of yore)

98 C2500 ext cab longbed