Junkyard Jimmy Super Low Buck Build Thread

[70rs/ss]

Make sure you didn't wipe a bearing, if the pump wasn't working for any amount of time, it might have done some damage. As for the oil pressure a stock 350 will run 15-20 lbs at idle and up to about 40psi under higher RPM's and a bandaid for lower oil pressure is thicker oil, 20w50 or straight 50 if in the warmer months. The 4X 4 lo or 4hi will make a different feel wheather the 4X works or not as 4lo still makes the rear 4 lo, so you should notice high RPM and slow moving in 1st gear. To check the 4X4 you need to be sure the hubs lock and that is it, the transfer case is gear driven, so once in 4X the front axle will turn unless the transfer case makes loud noises!

[Big J]

An easy way to test the 4wd is to put it in 4wd then cut the wheels all the way to one side. You should feel the truck not want to go and lurch as you apply throttle. Do it in the dirt. I've tried it that way many a time on concrete or asphalt but you can break an axle that way. Congrats on findin' some oil pressure.

[hgs_notes]

Originally Posted by 70rs/ss

Make sure you didn't wipe a bearing, ... and a bandaid for lower oil pressure is thicker oil, 20w50 or straight 50 if in the warmer months.

I checked the front main, which was ok, but didn't check the rods. I figured they were not great to begin with. I'll run it like it is 'till I notice rod knock or other symptoms. As for the oil weight, I'm not sure heavier is better in this case.

Here's why, if I run lighter oil that flows easier, it should increase actual flow to the bearings, and should also be better in an engine with gunk build up in pushrods and lifters, etc. If I run heavier oil, the pressure will increase at the gage due to back pressure against the bearings, etc. It looks better at the gage, but may not be better lubrication. For now, I started with 5w-30 and I'll be treating it to clean the engine out some. When or if the oil starts looking cleaner after a few changes, I'll bump it up to 10w-40, or maybe 50. It sounds great, starts and idles like a champ, no knocks or clacking, etc.

Originally Posted by Big J

An easy way to test the 4wd is to put it in 4wd then cut the wheels all the way to one side. You should feel the truck not want to go and lurch as you apply throttle.

Thanks, I am pretty sure everything is good. I shifted it through all the different points and it drove each time, except neutral of course. I'm certain the transfer case is fine, oh yeah, I need to check the oil in that too. Anyway, I did feel the normal front axle lurch while turning. I guess the only thing I'm unsure of is whether both hubs are locking in. Is there a way to test this? Maybe jack up the front axle and turn the wheels by hand. Will the other wheel spin if it's not locked? Does it spin same direction if it has a posi only and reverse for open? If one wheel is in the air and the hub is open, will it spin freely? Then not spin when locked, cause the other wheel is on the ground and the transfer case is engaged?

Just throwing ideas out there. All my other 4wd trucks have been auto hubs, shift on the fly, etc. This is my first old school 4wd.

[70rs/ss]

Yeah, jack up one front tire at a time, lock the hub and you should feel hear it lock and it won't spin (in gear, 4 locked) mind you, then try other side same way. As for the thicker oil it actually fills the space in the case of worn or loose bearing tolerances. I guess the thicker oil could cause an issue, but if there is a restriction thin or thick it's going to happen. I run 20w50 in the winter, and straight 50 or 60 in the summer in my older v-8. The oil helps to keep the metal parts from touching the other metal parts! If you wiped a bearing, you'd hear it and the OP would be pretty low. Run straight 30 in it and get the cheapest auto parts brand oil you can find, as you are going to run it for a short period of time (with either the seafoam or auto trans fluid) just don't run it hard or drive it, just start it and let it idle, then dump it and change filter. I have heard of guys getting lucky and you seem to have a good bit of it!! I had a buddy lose a brand new motor because he didn't prime the OP and it ran with assembly lube and then welded stopped! I am still in complete awe of this build, the budget is rediculous, and that is why I love it so much. I have a couple of vehicles around here and lots of parts, once I can get around and do the work (back surgery 5 weeks ago) I will give this low dollar build idea a shot!!

[70rs/ss]

I had an old timer tell me the same thing, he used diesel in the oil and put a little in the gas to loosen carbon off the valves, but I was always a little scared to try it. The motor flush is pretty harsh I hear, but if it ruined motors I doubt they'd stay in busines?? I think any of the above stuff would work, I just knew some guys here praised seafoam?

[hgs_notes]

Thanks for the tips everyone.

On a side note, I know a guy up in northern MN that is into these trucks big time (no internet, no email). Anyway, I was working up there this week and stopped by. Told him about my luck at the junkyard and he may be trading me some parts for the step side fender I found. I might be able to get some significant parts for my $25 investment.

I also spotted some trucks at a metal recycler north of Thief River Falls. Talked to the owner and was told that he could not sell parts, but I could take some small stuff. So for $0 I got an arm rest, visors, ash tray, radio delete, transfer case shift knob, horn button, dome light with harness and a few other doo-dads. I might have been able to get more, but I didn't want to push my luck. All this stuff was quick and easy to get. Access was not good. As always, what I can't use for my own projects will eventually be sold.

During the 900 plus miles I put on since sunday, I looked at 2 trucks in the scrap pile, 2 along the road with for sale signs, 2 along the road w/out for sale signs (one was possibly abandoned) and then stopped at Flynns place (see above). He has a gorgeous red 72 long bed, copper 72 blazer, blue panel, green 4x4 long bed, another blazer he restored. I think he has a suburban in his shop and another couple trucks, oh yeah and a GMC 4x4 snow plow truck. He does restoration on his own projects all summer, then drives truck over the winter. Very good guy.

[hgs_notes]

Hows this for an update, pics of my daughter driving the beast.




She said it was hard to steer, she's used to moms denali. She said she wouldn't drive it unless I painted it and got rid of the GMC on the windshield. We'll have to see how picky she is about the paint.

[Jtrux]

Originally Posted by hgs_notes

Hows this for an update, pics of my daughter driving the beast.




She said it was hard to steer, she's used to moms denali. She said she wouldn't drive it unless I painted it and got rid of the GMC on the windshield. We'll have to see how picky she is about the paint.

It's perfect the way it is.

[badpeanut]

Originally Posted by hgs_notes

She said it was hard to steer, she's used to moms denali. She said she wouldn't drive it unless I painted it and got rid of the GMC on the windshield. We'll have to see how picky she is about the paint.

The paint on the body isn't too bad, why not paint just the hood?

My remanufactured power steering box in my Blazer has less effort than the original power steering box, so a steering box swap could be an option for you.

[hgs_notes]

Originally Posted by 71swb4x4

What's your dollar total right now?

With the new oil pump, I'm up to $388.

Originally Posted by badpeanut

The paint on the body isn't too bad, why not paint just the hood?

My remanufactured power steering box in my Blazer has less effort than the original power steering box, so a steering box swap could be an option for you.

The paint on the body is worse than it looks in the pics, You could never match it. Too much fade. The steering gets easier everytime I drive it, and it really is not bad, she just has nothing but the denali to compare it too. If anything, the pump might be weak, you can here it whine. I'll check the fluid level again and if it's good, I'll probably swap the pumps I have already.

Here's a short list of what I'm searching for:
pass side fender
steering wheel with or without column
ignition switch bezel
wheel trim rings (very high priority item)
Time, time, time

Hmmm, junkyard is open, I know where I can get at least 2 of those items. Talk you you all later.

[Long Roof]

Trans fluid (dexron) is high in detergents so it should clean up the engine. Just don't drive with it. My dad ran a service shop back in the day so he has done the trans fluid cleaner before. He also used to trickle it down the carb as the engine was running to clean up the valves. You have to keep the RPM's elevated a bit for this procedure and its better if the engine is at operating temp.

Looks like you are lucky. It happens every once in a while.

[71swb4x4]

What's your dollar total right now?

[71swb4x4]

Did you replace the pump? If so, did you bleed it? Mine was tough too, then I bled it and it was easy as pie to turn.

[hgs_notes]

Originally Posted by 71swb4x4

Did you replace the pump? If so, did you bleed it? Mine was tough too, then I bled it and it was easy as pie to turn.

It wasn't new, but a drained used one. It's really not hard. It's only slightly harder than my C-10, which should be expected considering the tire size alone. I'm not very concerned about it.

BTW, what are you working on lately?

[bigbadchev72]

tire size shouldnt be a problem, im running 38s on mine and can turn it with ease. noisy pump sounds like air in the system, is your fluid frothy? jack up your front end and turn for side to side with it running to bleed out the air.

Looking good

[hgs_notes]

Originally Posted by bigbadchev72

tire size shouldnt be a problem, im running 38s on mine and can turn it with ease. noisy pump sounds like air in the system, is your fluid frothy? jack up your front end and turn for side to side with it running to bleed out the air.

Looking good

The second time I added some fluid, it was a little frothy and I figured there was some air in it. I'll try this out when I work on it next.

[hgs_notes]

Tried bleeding the air out, but not sure it worked. Oil was still kinda frothy. I think the pump is just weak. I have another one to try on it, when the air dries out a bit. The dew point right now is 71, sweating just doesn't help much in those conditions. While the front was jacked up, I tried something else with the front axle. Hubs locked, turn the tire, opposite side spins opposite direction. Unluck hub, wheel turns on it's own freely, same thing for other side. Drove it again in 4wd and it's definitely locking up good. Got the transfer case shifter on, sweet.

I also found a pet living in it, time to test out the dryer sheet /rodent preventer trick. Downfall of of leaving it out at the farm.

I took it out down the highway! WOW!, Won't be trying that again for a while. Open exhaust, floor gone, weak brakes, YIKES! One plus was that after driving it at 55 mph and letting up on the gas, it was so quiet I actually thought the engine died.

Status of the apparatus:
Engine running-check
transmission working-check
transfercase working-check
front hubs locking-check
steering-needs work
lights and other electrical-needs work
brakes-yikes!
exhaust-kinda loud
floor-I'm a flintstone for now
body-who cares until other stuff is fixed

[Jtrux]

I've had best luck with bleeding the steering by turning the steering wheel to one side as far as it will go and pulling really hard on it, usually from outside the truck where I can get my body weight into it. The repeat from the other side. Usually works pretty good.

[68GMC454]

glad yu got it running i love this build...yoru lucky i dont think any of my kids would drive it.. for some reason beyond me i got stuck with kids who love imports.. im so ashamed, not sure what i did wrongg.. cool project..

[hgs_notes]

Originally Posted by 68GMC454

glad yu got it running i love this build...yoru lucky i dont think any of my kids would drive it.. for some reason beyond me i got stuck with kids who love imports.. im so ashamed, not sure what i did wrongg.. cool project..

We all have our crosses to bear...

[hgs_notes]

I really haven't worked on it much. Everytime I go over there, I end up driving it around the farm.

Anyway, I've changed the oil. Fixed the console lid (it was loose), and installed a custom steering wheel cover. Check it out.



That damn steering wheel was busted up pretty bad and sliced my fingers a couple times. Finding a cover is kinda tuff and a new wheel couldn't be found yet at the junkyards. I was looking for my duct tape when I came across some of my sons hockey tape. Perfect!

I also installed some BLING. Check out those unmatched mostly shiny trim rings. I do have wheel centers also, just need to dig them out of the garage. I'm thinking about painting the wheels black. Any opinions?



And of course, the budget. Spent $20 on the rings and $5 on an exhaust pipe coupling, yet to be installed. Total now up to $413. And I also found a spare ralley wheel for zero dollars. Just needs a tire.

[hgs_notes]

Heres a pic of my nicked crack shaft. And one of my 21st anniversary present. $200 at Northern Tool and included a load leveler. I couldn't build one for that price.

[lks dcvn]

I bought my lift last summer - I have used it for more stuff than I can remember since I got it.

Nice buy! Congrats!

[hgs_notes]

My plans for this truck over the next few months are simple. The motor will not develop any oil pressure, so I need to address that. The short block I have in the garage is going back together and will be swapped into the Jimmy. My son and I put the crank in the block today. I have to get some fresh parts washer fluid to clean up the pistons and rods before they go in. I also need to get a rear main seal (wasn't included in my cheap kit), get an oil pump, dip stick, lifters, and maybe a vibration dampener. I am going to use the old headers from my pick up if they'll fit the 4x4 chassis.

After that, I'm going through the brakes and get them up to par. And that is it for the time being.

I got my stick welder working this winter and plan on building an engine hoist for my 1st project. I am concentrating on my C-10 restoration for auto projects. I've convinced the wife to let me add onto the garage. Not to the size I want, but to what she will accept, so I have a lot of work to do there. I also have to get some kitchen cabinets refinished, get a couple walls sheetrocked and replace the kitchen window and maybe put in a new hardwood floor. Maybe with all of that I can negotiate another 60 sqft of garage space. Wish me luck.

[VA72C10]

Cool build thread...will be watching as you chip away at this thing :GMC: