Author Topic: 86 blazer with 6.2 and 3 speed auto  (Read 5680 times)

Offline DanMcG

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86 blazer with 6.2 and 3 speed auto
« on: January 07, 2017, 11:18:23 AM »
I hope to look at this truck tomorrow, but I'm clueless when it comes to diesels, any issues I should be looking for? what tranny is the 3 speed in 86? and I thought all the diesels came with 3/4 ton axles but this on appears to be 6 bolt 1/2 tons, was it just military k5's that used the 3/4's?
Thanks for any insight you can offer.

Offline VileZambonie

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Re: 86 blazer with 6.2 and 3 speed auto
« Reply #1 on: January 07, 2017, 12:50:01 PM »
M1009 should be 10 bolts with a TH400
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74 GMC, 75 K5, 84 GMC, 85 K20, 86 k20, 79 K10

Offline 82silverado

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Re: 86 blazer with 6.2 and 3 speed auto
« Reply #2 on: January 07, 2017, 01:55:59 PM »
Exactly. I have worked on those things on the job for years. Anyone that needs to know about them, feel free to ask.
« Last Edit: January 08, 2017, 02:05:05 PM by Captkaos »
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86 Buick GN
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Offline DanMcG

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Re: 86 blazer with 6.2 and 3 speed auto
« Reply #3 on: January 07, 2017, 03:04:05 PM »
So if you guys were to rate a 6.2  and a 400 tranny on a 1-10 scale where would it fall as far as desirability ... I'd like to use it foe a plow truck next winter. I see its rated for a 140 horse which seems odd to me, i thought it would more houses the a 350 gas motor.

Offline VileZambonie

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Re: 86 blazer with 6.2 and 3 speed auto
« Reply #4 on: January 07, 2017, 03:09:55 PM »
Some people love them. I personally think they are noisy slugs that aren't enjoyable to work on or drive and they typically get problematic in the cold. I would prefer a nice smooth running 350 gas engine. That being said if all you are doing is pushing around snow and it's in good shape, it may be a perfect fit for what you are looking for.
,                           ___ 
                         /  _ _ _\_
              ⌠ŻŻŻŻŻ'   [☼===☼]
              `()_);-;()_)--o--)_)

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

Offline 82silverado

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Re: 86 blazer with 6.2 and 3 speed auto
« Reply #5 on: January 07, 2017, 05:01:20 PM »
As far as the transmission goes, that is a rock solid unit. The 6.2 is not desirable to me. That is why I dropped in a BB in the 82 I own thatcame with a 6.2. But if I was only going to use it for plowing, Then Vile Zombie hit the nail on the head.
82 Silverado 454/700R4
86 Buick GN
02 WS6

Offline DanMcG

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Re: 86 blazer with 6.2 and 3 speed auto
« Reply #6 on: January 07, 2017, 05:16:07 PM »
thanks for the opinions guys, I appreciate it..
 I'l see how bad the body is and go from there. The truck was a local municipality vehicle with only 38,000 miles on it.
Does the 6.2 offer any benefits for a work truck over the 350, I notice it lists only has about 140 horses but I'm not sure if that matters for comparing power/torque.

Offline 1967KaiserM715

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86 blazer with 6.2 and 3 speed auto
« Reply #7 on: January 08, 2017, 11:20:03 AM »
The 6.2/5 platform is geared for economy not power, so they are slow, and while they can get a load moving, going up inclines slow them considerably.

If it was a municipality truck, it is very likely the military M1009. 10 bolts front and rear, rear has locker. 3.08 gearing.

I like the 6.x platform, but it's not for everyone.

Edit:military Blazers were exempt from emissions, so it would be a J-Code, probably rated closer to 165 horses; just a little FYI

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« Last Edit: January 08, 2017, 11:22:23 AM by 1967KaiserM715 »
Current Vehicles:1985 GMC K10(Daily) 1991 GMC K2500(Daily) 1975 Beetle(not running) 1985 Mercedes 300D(not running) 1952 M35    1967 M715(not running)
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Offline DanMcG

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Re: 86 blazer with 6.2 and 3 speed auto
« Reply #8 on: January 08, 2017, 11:41:57 AM »
thanks for the info 1967KaiserM715

Offline Captkaos

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Re: 86 blazer with 6.2 and 3 speed auto
« Reply #9 on: January 08, 2017, 02:06:45 PM »
If it makes a difference the 350 in those years were no more than 165hp..  So....
The Diesel you can get 20mpg out of, where the gas you cannot.

Offline fitz

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Re: 86 blazer with 6.2 and 3 speed auto
« Reply #10 on: January 14, 2017, 06:42:28 PM »
Did you buy the truck?

Offline DanMcG

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Re: 86 blazer with 6.2 and 3 speed auto
« Reply #11 on: January 15, 2017, 04:38:22 AM »
Did you buy the truck?
No the owner was out of town until today, so I had a lot of time to think it over. The more I thought about it, the more I realized a diesel might be to big a learning curve right now.

Offline fitz

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Re: 86 blazer with 6.2 and 3 speed auto
« Reply #12 on: January 16, 2017, 05:50:01 AM »
As others have pointed out, it sounds like a Military CUCV M1009. 
These trucks fall into the category where you love them or hate them.  I personally love them ( I own 1 nice clean rust free 1 and 3 rusty parts trucks M1009's).
They are as bare bones truck as you can get in that era (no air cond, radio, etc).  They also came stock with a 24 volt starting system that takes some time to understand how it works.

Offline Captkaos

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Re: 86 blazer with 6.2 and 3 speed auto
« Reply #13 on: January 17, 2017, 02:02:53 PM »
I switched the K5 I converted to 12V.  Only part of the system was 24V which adds to confusion.

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