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Old 05-06-2021, 08:15 AM   #26
LT7A
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Re: HG's Plow Truck, '78 GMC K35 Dually

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Originally Posted by hgs_notes View Post
Almost a year! It has a 400 sbc and TH400. I think it's a 208 transfer case. Rear axle is a Dana 70 with a posi. Front axle is a Dana 44. Or was. I'm just finishing up the Dana 60 swap. It had 4.56 gears but I'm changing to 4.10s.
That's a stack of good stuff. That truck is set up to get the work done but will be cool to drive whenever for whatever.
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Old 05-07-2021, 06:26 PM   #27
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Re: HG's Plow Truck, '78 GMC K35 Dually

After a couple days on the road I got back on it. New brake line, both new hoses on, new shocks and steering stabilizer. Brakes bled, oil in the diff. Time for a test drive! No issues there. I checked bearing temps after. Might need to bleed the brakes again but they work fine. Just not as hard a peddle as before, which was a bit stiff anyway.

I'm still doing a couple more things to spiff it up but the axle swap is DONE!: The front is about 2" taller than before. Actually a little higher than the back now. The ride is stiff but not noticably harder than before. It looks so much better now.
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Old 05-08-2021, 08:41 PM   #28
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Re: HG's Plow Truck, '78 GMC K35 Dually

Next step mechanically is to get the rear axle regeared. I bought another posi carrier and set of 4.10 gears.

For now though I don't need 4wd. Instead I did a couple cosmetic things. A friend gave me a drop hitch bumper. It was bent/twisted because some welds broke and the weight of the load twisted it. The welds were crap. Half inch plate that had a tiny little fillet welds. No penetration. When I dropped off the wheels for powder coating I asked them about the cost of doing the bumper and if they could straighten it. They wanted to give it a shot. Their welding wasn't great looking either but it was substantial anyway. It came out pretty decent. I've never seen one that wasn't chrome. This one was too before coating. But I love the look matching the wheels.

And the other thing was getting a little paint on the sides of the truck where the stripe was. I just went over it with the random orbital and rattle canned it. Just got the driver side done so far. The silver tailgate definitely needed to change. It had a little rust hole on the bottom left so I did a patch on it first. Then rattle canned it too. I'll do regular automotive paint once rust repair is done, whenever that happens. It needs rockers, maybe cab corners, some patches behind the rear wheel wells, and at least 1 cab support.

I'm really happy with how it's looking now though. Black and white is always in style.
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Old 05-10-2021, 05:42 PM   #29
Low Elco
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Re: HG's Plow Truck, '78 GMC K35 Dually

It's coming along nicely! Now ya gotta go find something big to hook it to and drag stuff around.
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Old 05-10-2021, 08:25 PM   #30
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Re: HG's Plow Truck, '78 GMC K35 Dually

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It's coming along nicely! Now ya gotta go find something big to hook it to and drag stuff around.
Hell yeah!!

Couple things to do first. Now the front axle is 4.10 ratio and the rear is 4.56. I have a set of gears and locker diff to get installed. When I took it out on the highway for the test drive it was lugging a bit. I've had problems with grit in the fuel clogging the jets so I put a filter on but there may still be a problem. It will need to be aligned. I put collector plates on it so to drive it anywhere I just have to contact the insurance company so it's legal.

The next upgrade I'm planning is exhaust. It has a tiny single exhaust that is choking the big 400. But that's going to wait a bit. I need to diagnose a problem with my 71 engine and get the crewcab back together. Finally done with working weekends for a while and it's warming up so that's what I'll be wrenching on.

Pic for attention...
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