76' 1700 4x4 - Army


The workhorse

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Post Mon Jun 19, 2017 8:25 pm

76' 1700 4x4 - Army

I came across a 1976 International 4x4 that I just couldn't resist buying. It was an old Army truck sold at an auction in 1992 to the fellow I bought it from. He did nothing with it much except let it sit in the Arizona hot sun all those years. Well I have it and I want to figure out what I have. I found the LST, but in summary I think what I have:

1976 International Loadstar 4x4
SV-392 gas engine (I think with improved cooling)
T-496 5 speed transmission
T-223H transfer case
Rockwell rear end - I think 7.17 gears
NAPCO front end

What do I want to do with it? I think I want to restore the cab (frame off), repower with a 6v53T, and adjust the ring and pinion gears for better highway use to pull trailers, Airstream, and haul the occasional big truck or item for self and friends.

It should be noted that I have a complete 1975 1850 donor vehicle with a 6v53 and I have the Turbo and necessary attachments to go from a naturally aspirated engine to a turbo. I believe I may have to use the transmission in addition to the Detroit engine because the SV transmissions don't bolt up so easy to a Detroit.

What ring and pinion gear options are available to me? Also, having a NAPCO front end, does that limit me? My goal would be to keep this 4x4 with a 6v53 turbo'd Detroit.

Any thoughts, and opinions are greatly appreciated in advance.

Your humble servant,
Attachments
1976 Army Loadstar 4x4.jpg
Front view
Rear End.jpg
Rockwell rear end
NAPCO 4x4 Tag.jpg
NAPCO front axle
1976 IH Loadstar.jpg
Side view of Loadstar
76 IH LST.jpg
Line Setting Ticket

Rusty Driver
Rusty Driver

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Joined: Tue Apr 04, 2017 8:00 am

Post Mon Jun 19, 2017 9:50 pm

Re: 76' 1700 4x4 - Army

I can be of no help on your questions, but I am insanely envious ! What a great find, have fun with it.

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Post Tue Jun 20, 2017 6:26 pm

Re: 76' 1700 4x4 - Army

Thanks. There is so much I do not know and I have found a lot of valuable information here.

Golden Jubilee
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Location: Lyman, IA

Post Tue Jun 20, 2017 9:20 pm

Re: 76' 1700 4x4 - Army

I'd look on the head of the pinion for "makers mark" or logo. My guess is that it was made with gears from one of the big Diff mfg. (Eaton, Spicer, Rockwell or IHC)
Once you know the make of the gear-sets, then you have to determine the model, and from there, you can determine what ratios are available.
Two things make me think Rockwell, 1st the rear is a Rockwell and 2nd the ( ) on the ends of the front axle is a Rockwell indicator on the axle shaft.

Golden Jubilee
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Post Tue Jun 20, 2017 9:33 pm

Re: 76' 1700 4x4 - Army

The Rockwell "C" is an 11,000 LB axle and ratios go from 3.70 down to 7.20, but the "fast" ratios take a different "case" than the STD ratios, so without a case change the fastest "std" ratio that can be fitted is 5.13, which isn't a great ratio if you have 9x00 20 tires or smaller. a 6v53 maxs out around 2800 IIRC. You are not going to get great highway speeds out of the running gear you have.

Golden Jubilee
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Location: Lyman, IA

Post Wed Jun 21, 2017 12:46 pm

Re: 76' 1700 4x4 - Army

Two things lead me to think the rear is not a "C", one is too low a rateing and another is they don't list a 7.17, might be a D or F both of which are the next size up and have a 7.17 as an option. Neither list as fast a ratio as the C does, so more bad news on that front.
I think if you are going to stay 4x4 with the stock Air brake axles, your selection is going to be very limited.
For higher speed, you'll need an AUX trans between the engine and transfer case. Even with an Aux your O/D ratios are somewhat limited as well. Don't expect to be able to gear for 65-70 MPH.
If you can get "casting numbers" off the axle shaft or a part number off the pinion I might be able to narrow it down some more.

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Post Wed Jun 21, 2017 8:08 pm

Re: 76' 1700 4x4 - Army

Here are more pics off the rear axle.

If I am reading the line setting ticket right it says the following for the rear axle:

RA-44 Housing - SE 1404402520KMPQTV
Spring Main
Spring Aux
Diff Carr GR 7.17
U5-U5, 55-55, D5-U5 FLG
MAG DR PLUG REAR AXLE - 148600009D

Not sure what RA-44 represents. Also, this is where I pulled 7.17 as the gear ratio. I am assuming the rear axle is the same as what the line setting ticket says.

The numbers I see on the axle - I think - say 161018-R2 below a logo of some sort, then KD18, and below that I think a 5 and 76 (month & year?). Near the bottom of the picture next to a bolt I see a 7 and a 6.

I have heard of 4.9 gears from http://www.ouversonusa.com/rockwell_490_gearset.php - Ouverson USA that would fit a Rockwell. Obviously a no go if the front can't match those gears or I have the wrong rear axle to fit those Ouverson gears.

I notice on the LST, at the top and at the very bottom, they wrote in a different value for the overall weight rating. Inside the cab there is a military plate showing 24,000 as the GVWR. I am under CDL with that rating, but looking at the LST they crossed out the 24,000 and put 27,080 GVWR. At the bottom they individually compute it for both axles - 9,000 for the front and 18080 for the rear making 27,080 - but then they also write in some numbers '163468B1 63353H' - I assume the LST is calculating weight ratings....I could be misinterpreting this part of the LST.
Attachments
Rear Axle Rear.jpg
Rear axle with logo on back?
Rear Axle Front.jpg
Rear Axle 12 bolt
Rear Axle Numbering.jpg
Rear axle numbers

Golden Jubilee
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Post Thu Jun 22, 2017 7:18 am

Re: 76' 1700 4x4 - Army

The gear-set link is for the duece and a half top loader rears, not what you have. But I have some better news. IF your rear is an 18,000 lb rear, It is likely a Rockwell L series and gear set were made up to 3.7 and it uses only one carrier for all ratios, meaning that you can swap ratios without changing the carrier.
Look on the end of the axle shaft (part that sticks out of the hub/wheel) for a casting number, I'll see if I can cross that to a axle family.
You could also drop the driveshaft and get the numbers off the pinion and that would help.
A Photo of the front driving axle may help IIDing it as well, also the same info (axle casting, numbers on pinion) could go a long way in finding out what is in it.
Edit:
on further digging I found that the fast ratios DO take a special case, and 4.56 is the fastest "Std" ratio for the L series.
The rear axle should have 12 bolts and a forging number of 3202-E-7571 if it is an L series.

Golden Jubilee
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Posts: 5170

Joined: Thu Nov 29, 2012 9:28 pm

Location: Lyman, IA

Post Thu Jun 22, 2017 9:57 am

Re: 76' 1700 4x4 - Army

Getting out my magnifier, you rear axle has 8 bolts which eliminate the L series, so likely a H but would need more numbers to tell. It might be that whatever the rear turns out to be, the front uses the same "guts" in a special Napco housing.

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Post Thu Jun 22, 2017 1:19 pm

Re: 76' 1700 4x4 - Army

Thank you for your help. It is greatly appreciated.

If I don't get home too late tonight I will take a look at what you asked. Definitely tomorrow I can. Also I know better what to look for and can take some better pictures.
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