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Father-daughter 76 annihilator build

That's a Dana 44 front and a full floater 14 bolt. K20, not K30. Also, you could not get a big block in a 4x4 yet in 1979.

Still not a terrible buy for $600. What gears are in it?

Martin
 
Wait, those are upside down U-bolts on the rear. That is how K30's come. K20's have them facing the other way. Someone just stole the Dana 60 from it, and swapped in an axle from a K20.

Martin
 
that's kinda what I was thinking is it lost it's dana 60 and the big block was added also from the looks of things. Thanks for your help it is much appreciated. Might call him on the rear and he had another 79 short bed 2 wheel that had a windshield and good doors so I might look into some of the stuff and yes I think I can get it for a good deal as he is setting a 59 delivery wagon on the 2 wheel chasis and doesn't need the rest. If it came with a 350 could it still have the 400 tranny if it was a k30?
 
Is this set up much of an improvement over what i'm running stock. Didn't look for gear ratio as I figured if doing swap I would end up regearing and rebuilding them to get to proper ratios anyhow. I thought that if you want to run 37's you need to go to at least 456 or 488 and those are not going to be stock gears, am I wrong in my thinking? This is a little ahead of where I have been researching. Planned on cage, bumpers and seats first. Safety first, after all it is my daughter that is wheeling this quite often. By the way Martin my moms family was from Lincoln area and her sister moved back out there recently to retire on or near where they grew up. Small world getting smaller all the time.
 
Factory gears in K20's and K30's are 3.73, 4.10, and 4.56. I am running 4.10's in my 1988 V10 Suburban, and I have had 37's on it. If you can buy the whole truck for $600, that is what I would do. Take the axles, and any other parts you may want, and then haul the balance in for iron.

Martin
 
I have a 79 1 ton in my front yard right now with a 44 in it. Though its nothing fancy it is known as an HD it was GM's answer to cut costs and the trucks came that way from the Factory. Just a Robbing from the Factory. Penny Pinchers.
 
TDAWG1 said:
I have a 79 1 ton in my front yard right now with a 44 in it. Though its nothing fancy it is known as an HD it was GM's answer to cut costs and the trucks came that way from the Factory. Just a Robbing from the Factory. Penny Pinchers.
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Do you have any way of proving that? I have never heard of such a thing. Martin
 
76zimmer said:
Does the T400 have the 203 behind it? That is the magic combo for a iron case doubler setup, and getting hard to find them that way.

D60F id thread:
http://coloradok5.com/forums/showthread.php?t=271194&highlight=D60F
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Thanks, the truck has part time (hubs) so it's the other (205) that I will need for a doubler because I have the full time 203 I believe currently in my Jimmy or the other way around. Still think I'll go try to get all I can off this guy seeing as parts trucks don't show up around here often.
 
Some one could have put a part time kit in the NP203. That is what it would have had from the factory (an NP203) behind an automatic. Only the 4 speed got the NP205 until 1980. My guess is it is a TH400/NP203.

Martin
 
Martin is right, thats the right spacing shock mounts spring perches etc for an actual one ton truck not a 3/4 ton

Your Jimmy probably has the 203 in it right now. You still need a 205 that came from behind a turbo 400 for a doubler though. It has the bigger input.

As far as gears go, I ran 38" swamper radials ( pretty much a 37" tall tire) with 4.10s and liked it just fine. Sucked for wheeling but the doubler took care of that.

Then I ran 40s and 42s with 4.56s those were just fine too. My motor was stock but in good shape, nothing really modded to it. The doubler really comes into play though off road. Anything off road with the 203 sucked ( as it would with a 205 because they are pretty much the same gearing) but with the doubler it was night and day.

Although lemme throw a wrench in the works for ya. I don't know how hard this is gonna get wheeled. Why not consider a 700 and a 241. With the 700s first gear and the 241s 2.72 low range it is almost as low as a turbo 350 or 400 with a doubler. 3.06 first and a 2.72 reduce you to 8.32 turbo 350 gives you a 9.8. 4.10s are about the perfect all around gear for a non over drive truck running 37s IMHO. With the 700 you could gear it to 5.13s no problem that will actually give you back all that you give up with a 350 or 400 and a doubler.

Of course you can use the 241 as your front case in a doubler too :D:D

Just trying to demonstrate there are many many ways you can go.

The costs may be slightly in the favor of a turbo 400 or turbo 350 doubler setup. A 700 will require a rebuild adding some performance parts to it to make it better ( some on here will boo me for even suggesting a 700) plus you will need to find a 241 out of an 89 with the mechanical speedo and then you would have to do a slip yoke eliminator on it. Then gear the axles.

Kind of depends on how much you can do yourself where the costs come in.
 
Thanks for the ton of info, I will more then likely end up for awhile with the 350 engine hopefully with a 400 doubler setup. The wheeling here is vast and changes a lot with where your at so the doubler sounds like it handles the widest variety. Not much mud around but lots of rocks and washes you can wheel up sometimes for miles. Mining roads galore but many of them get off canter big time with huge drops to bottom so you error on safe side. Shall be fun to get cage in first to work on welding skills and fab work looks fun to me, all the angles and bends. When you start ordering Dom is 8 ft lengths enough for most everything? Saw somewhere advertising 8 and 4 ft lenths and seems that might not be long enough for some of the stuff I've seen you'll fabbing. Thinking out loud haven't started measuring yet. Thinking of speedway bender like zim used.
 
blazinzuk said:
The costs may be slightly in the favor of a turbo 400 or turbo 350 doubler setup. A 700 will require a rebuild adding some performance parts to it to make it better (some on here will boo me for even suggesting a 700) plus you will need to find a 241 out of an 89 with the mechanical speedo and then you would have to do a slip yoke eliminator on it. Then gear the axles.
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Not me. As far as I am concerned TH700R4 > TH350 > TH400.

Unless you need all out brute strength, TH400's suck. They burn up too much power, having crappy gearing, no overdrive, have a hokey kick down setup, and are hard on fuel economy, and if you really need brute strength, than you should be running an SM465.

Martin
 
If you are bending a cage you need full sticks for at least a couple of bars.

B pillar usually uses about 12-15 feet. If you do a front halo or a rear halo both of those are going to be 10 ft +

You need to find a local steel supply store. Kind of sounds like you are just looking on line.

Martin I am with you on the 400 great for brute strength. Mud truck, puller, high HP sand machine sure, but I think the weaknesses out weight the strengths on a truck like this.

Zsnoman, have you heard of the 400s cracking problems. I have seen it many times. But you usually don't hear about it, it cracks the case on the back towards the output. Doesn't happen all the time but it does happen,

Of course the 700 and 350 pull the threads out of the transmission, so you have to helicoil them. :D

Lots of guys will tell you that you need a 400 because its the strongest, well sometimes the strongest is not the best in a certain situation.

Oh yah a 700 has a lockup tq converter so you can get slightly better mileage even if the gearing is setup so you are running the exact same overall gearing. The lockup will drop the rpms a hundred or so
 
Other than the research I did and the Truck siiting outside in my driveway. No I can't IT has everything Badging Siera Grand 3500 TH400 203 Tcase/ FF14blt rear one ton springs. Everything but the 60front.
 
TDAWG1 said:
Other than the research I did and the Truck siiting outside in my driveway. No I can't IT has everything Badging Siera Grand 3500 TH400 203 Tcase/ FF14blt rear one ton springs. Everything but the 60front.
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I think this is going to be a case where there is no way of proving it, and each party will continue to believe they are right. I personally beleive that your truck originally had a d60.
 
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