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#1 |
Account Suspended
Join Date: Apr 2009
Location: hazard, ky
Posts: 1,674
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Re: 1978 full-time 4x4. Is a 700r4 worth it?
just lock it in 4wd when you get out in a storm in general if your that afraid of the 2wd. me i just use 4wd when i know its something it wont climb in 2wd.
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#2 |
Account Suspended
Join Date: Apr 2009
Location: hazard, ky
Posts: 1,674
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Re: 1978 full-time 4x4. Is a 700r4 worth it?
or use auto hubs. cake you can eat.
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#3 |
Registered User
Join Date: Feb 2014
Location: Ontario
Posts: 11
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Re: 1978 full-time 4x4. Is a 700r4 worth it?
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#4 |
Registered User
Join Date: May 2010
Location: Lewis County, WA
Posts: 1,523
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Re: 1978 full-time 4x4. Is a 700r4 worth it?
That is about right.
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'77 K35 - 454, SM465/NP205, 4.56 D60/14bFF |
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#5 |
78K & 79C Jimmys
Join Date: Nov 2009
Location: Ottawa Ont CANADA
Posts: 7,901
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Re: 1978 full-time 4x4. Is a 700r4 worth it?
Rocking back and forth "stuck" can make them autos engage /disengage
not a good idea with spinning wheels
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John 1978 GMCJimmy4X4-350/203 1979 GMCJimmy4X2-305/350 |
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#6 |
Account Suspended
Join Date: Apr 2009
Location: hazard, ky
Posts: 1,674
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Re: 1978 full-time 4x4. Is a 700r4 worth it?
never had any problems on the 84 i had and it had a million miles on it. unless your doing some kind of severe offroading i dont see it being a problem. that said a new truck has no hub selector only thing goes out has nothing to do with the fact there locked. so i cant see it being a harm to leave em locked.
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#7 |
Registered User
Join Date: Feb 2007
Location: Memphis MI
Posts: 1,851
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Re: 1978 full-time 4x4. Is a 700r4 worth it?
The key is, find your motors torque curve and gear for it. ALL my trucks run 1600-1650RPM at 55 - 5.3/4L60E/3.23 3/4 ton, 4.3/700R4/3.08 1/2 ton, and 6.2 diese/700R4/3.08 1/2 ton. Any less RPM, lugs excessively. Any more, wasting fuel.
One of th rare cases where math is your friend. But be honest - if you want MPG buy a Cruze and use your truck only when desperately needed.
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1987 2 ton ![]() 1982 ![]() Dad's 1981 ![]() Plus a mess o' tractors |
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#8 | |
just can't cover up my redneck
Join Date: May 2004
Location: Columbus OH
Posts: 11,414
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Re: 1978 full-time 4x4. Is a 700r4 worth it?
You can't lug a carbureted engine down that low and expect anything out of it. The mileage will suffer as well as throttle response/driveability
You really shouldn't with injection either, unless you really never drive that slow....
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#9 | |
Registered User
Join Date: Feb 2014
Location: Ontario
Posts: 11
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Re: 1978 full-time 4x4. Is a 700r4 worth it?
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#10 |
Registered User
Join Date: Sep 2010
Location: Lake Tahoe, Nevada
Posts: 755
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Re: 1978 full-time 4x4. Is a 700r4 worth it?
I've been thinking this same project. Of course, my TH350 and NP203 are in good running condition, so swapping them isn't as high a priority. But here are my thoughts and research:
First, I don't really care for all-wheel drive. It's an open differential between front and rear, so if any set of tires slip then all the power goes to them anyways. I don't believe it buys you anything substantial over 2wd. I don't know about the NP203, but I know lots of people like the NP205, and they need to get creative to make it fit because of driveline clearance issues. The NP203 might be similar. Personally, I think you would be better off with a transfer case specifically designed to work with the 700R4 like the forementioned NP208 or NP241. If it's a money issue, I bet you could find a transfer case for possibly cheaper than an adapter for the NP203. If the goal is milage, then I'd still advise you to dump the 203. Spinning all that front running gear is just eating gas. You want selectable hubs and the ability to just run 2wd. If convience is your issue, I don't think there is anything devastating about running selectable hubs locked all the time. Sure, it will increase the wear and tear, but it can't be worse than an NP203 that is already running them locked all the time, right? I do this in the winter on my Ford pickup up and over mountain passes. Lock the front hubs, but keep the transfer case in 2wd. If I hit snow, put the transfer case in 4WD and I'm golden. I lock my hubs usually around early November, and unlock them around March. Like I said, I'm in the same boat. I've got the same package, and I'm looking for the same change. I just don't see any major reason to keep that NP203. I researched it once, but I can't remember the reasons that led me to choose the 241 over the 208. But I DO remember they only had a speedometer cable for one year, and then they switched to electronic speedo. So I'm looking for a 700R4/NP241 combo from an 89 Blazer.
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I know a little about cars, but if you have a question about electricity or sport quads, I'm your man!!! |
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#11 | |
Registered User
Join Date: Feb 2014
Location: Ontario
Posts: 11
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Re: 1978 full-time 4x4. Is a 700r4 worth it?
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#12 |
Account Suspended
Join Date: Apr 2009
Location: hazard, ky
Posts: 1,674
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Re: 1978 full-time 4x4. Is a 700r4 worth it?
my 01 ran 1800-1900 at 70 it was 4wd would never get under 17-18 mpg no matter how fast you drove it. most of the time was in the 20-21 mpg range. saw about 23-24 mpg once on the highway. i dont see that your lugging it like mentioned. most v8s dont lug until there under 1500 rpm. my dads 4.3 s10 was the same it was 67 at 1900.
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#13 |
Registered User
Join Date: Jan 2010
Location: Tonasket, Washington
Posts: 316
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Re: 1978 full-time 4x4. Is a 700r4 worth it?
Jankovic,
I know what you mean about your 203/fulltime. I've thought about doing the same as your thinking and using a 700r4. But just in the thought process. May never do it. Anyways...along time ago I changed mine to part time and have regreted it ever since. I don't wheel or beat in my truck so I don't need a beefier transfer case. And I found that now when I am in 4wd it catches when I turn in a parking lot if there is an area that isn't slick. Also I find that I got even tire wear with the full time and terrible tire wear with part time. So some day I'll change it back. Anyway just sharing thoughts and saying I understand where you are coming from.
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-Aaron '15.5 Chevy Duramax LTZ/Z71, LML, CC/SB '77 Chevy K10, 4" lift, 33-12.50, 350/350 '55 Chevy Short Box (In Pieces)MII,4-link,Bagged,383 Stroker,700r4,3.73posi (SOLD) My 55.2 Chevy 3100 Build |
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#14 | |
Account Suspended
Join Date: Apr 2009
Location: hazard, ky
Posts: 1,674
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Re: 1978 full-time 4x4. Is a 700r4 worth it?
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#15 |
Registered User
Join Date: Jan 2010
Location: Tonasket, Washington
Posts: 316
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Re: 1978 full-time 4x4. Is a 700r4 worth it?
Ahhh...good to know!! Thanks
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-Aaron '15.5 Chevy Duramax LTZ/Z71, LML, CC/SB '77 Chevy K10, 4" lift, 33-12.50, 350/350 '55 Chevy Short Box (In Pieces)MII,4-link,Bagged,383 Stroker,700r4,3.73posi (SOLD) My 55.2 Chevy 3100 Build |
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#16 | |
Registered User
Join Date: Feb 2014
Location: Ontario
Posts: 11
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Re: 1978 full-time 4x4. Is a 700r4 worth it?
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#17 |
Registered User
Join Date: Jan 2010
Location: Tonasket, Washington
Posts: 316
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Re: 1978 full-time 4x4. Is a 700r4 worth it?
I used the mile marker conversion.
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-Aaron '15.5 Chevy Duramax LTZ/Z71, LML, CC/SB '77 Chevy K10, 4" lift, 33-12.50, 350/350 '55 Chevy Short Box (In Pieces)MII,4-link,Bagged,383 Stroker,700r4,3.73posi (SOLD) My 55.2 Chevy 3100 Build |
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#18 |
Registered User
Join Date: Feb 2014
Location: Ontario
Posts: 11
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Re: 1978 full-time 4x4. Is a 700r4 worth it?
Well from what I've been reading, the first step is definitely a vacuum gauge regardless of the gearing and transmission. I just might be steering to the 700r4 - np208 - locking hubs configuration.
I like the idea of just keeping the hubs locked in the winter months and unlocking them in the warmer months. Being honest with myself, I have got stuck in snow way more than in mud. Mainly because if it seems muddy, I stop and ask myself whether it is worth it. (stuck, get out walk, get a tractor, or go to the neighbors and ask for their tractor all the while in a soupy mess). Snow isn't as bad. I'll chew on this for a bit. Whatever install I do, I will be back on this thread to update what configuration gave me the best fuel mileage. I plan on working on the truck once the weather warms up (currently -19C or -2.2F haha). |
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#19 |
Account Suspended
Join Date: Apr 2009
Location: hazard, ky
Posts: 1,674
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Re: 1978 full-time 4x4. Is a 700r4 worth it?
he did the 203 conversion. i hear nothing but horror stories out of it from the jeep guys.
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#20 |
Registered User
Join Date: Feb 2014
Location: Ontario
Posts: 11
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Re: 1978 full-time 4x4. Is a 700r4 worth it?
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#21 |
Account Suspended
Join Date: Apr 2009
Location: hazard, ky
Posts: 1,674
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Re: 1978 full-time 4x4. Is a 700r4 worth it?
wasnt in the truck i had which was a k20 or the few k5s and k10s ive rode in. i dont see how it could really in the front the thing is completely free spinning in the shiftable 4wds when not engaged. its just like throwing a trans in neutral. the later trucks like my 04-01 your hubs stay engaged even and ive never had that issue. now ive had rear posi do that in curve on a hill some times but that has nothing to do with a 4wd system since its occured even in a 2wd truck ive driven.
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#22 |
Account Suspended
Join Date: Apr 2009
Location: hazard, ky
Posts: 1,674
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Re: 1978 full-time 4x4. Is a 700r4 worth it?
i odnt think you will complain with the set up at all. how healty is your engine btw you may look into a ls/60e swap with the 208 if your going to need a better engine soon anyhow.
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#23 |
Registered User
Join Date: Oct 2013
Location: Maine
Posts: 2,357
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Re: 1978 full-time 4x4. Is a 700r4 worth it?
Running your front hubs locked while in 2wd on ice is going to make for some funky handling. Those front wheels aren't going to roll as easy as being unlocked and will be sliding instead of rolling. You don't want to learn that the hard way. If you don't need all wheel drive in your climate then a part time transfer is all you need.
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76 Chevy K20 76 GMC K15 77 Chevy C10 77 Chevy K10 |
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#24 |
Account Suspended
Join Date: Apr 2009
Location: hazard, ky
Posts: 1,674
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Re: 1978 full-time 4x4. Is a 700r4 worth it?
you do realize that all trucks built in the past 20 years besides superduties have the front wheels locked all the time from the factory. i just drove my 04 in 2wd on ice you dont notice it really.
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14 bolt, 350 sbc, 700r4, mpg, th400 |
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