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BrothersGarage - 1971 521

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Thank you for the information.  The ones on my 86 work good.

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I have never seen anything before 1984 with self adjusters myself, but I have mostly dealt with 720 diesel truck frames/chassis which were the most part 1981 trucks and none of them had self adjusting brakes on the rear axle, I think I had one 1982(my first diesel) and I never had it apart, it ran great when I bought it and it ran great when I sold it after putting over 25,000 miles on it in less than 2 years, it had 350,000 miles on it by then.

Maybe the diesels were slow to sell and most of them sold in 1982 were 1981 built models.

 

I am thinking that this is a 521 frame with lengthened upper control arms, there are a few things I would check, but the easiest would be the angle of the shock tower, what size bolt head the upper control arm bolts have holding them on, 720 upper control arms are offset, I cannot tell for sure which way they are offset on the photos, but I am thinking towards the rear and that is what I had to do to get the castor set properly, from what I can see it doesn't appear to have the steering gear on the outside of the frame in the driver side photo so it is not a 720 frame/chassis, it would seem to me that if it were a late 620 balljoint/disc brake frame/chassis that they would have just left the 620 upper control arms on it, so again I am thinking 521 frame/chassis with lengthened upper control arms that are reversed to get proper castor just like I did.

 

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521 trucks used SAE  threaded fasteners, 620 trucks used metric fasteners.  Find a threaded hole anywhere on the frame.

521 trucks also have a serial number on the top of the right frame rail, aft of the front suspension.

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The 620/ 720 had a serial number on the top of the right frame rail just forward of the engine mount..... The 620 will say HL620 the  720 HL720, ML720. SL720 is unlikely for  the diesel.

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Even more specific, the 720 VIN is on top of the frame spanning where the idler arm mounts

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 The 17 digit VIN began on the 81 model. That's a made in Japan Z24, long wheelbase can't read the rest. Before '81 it was a model identification specific to Nissan and all auto makers made up their own code.

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3 minutes ago, datzenmike said:

 The 17 digit VIN began on the 81 model. That's a made in Japan Z24, long wheelbase can't read the rest. Before '81 it was a model identification specific to Nissan and all auto makers made up their own code.

 

That pic is irrelevant other than showing location. That's a front clip I cut off a donor. Wish I had grabbed the whole column too. The yard got shut down by CARB or the EPA not long after...was one of the better yards too

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Definitely not a 720 frame as the previous owner had to make custom mounts for the 720 engine to mount with the suspension.

 

eLJ0eG6.jpg

 

Should be able to make some more sense of it soon as it appears the 720's engine has given up the ghost and the swap will be happening sooner than expected.

ots of parts on the way - but the next one is a full aftermarket wiring harness: https://kwikwire.com/14-circuit-wire-harness/

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If doing a KA get the Can Am box that Icehouse sells and the engine mounts that ]2eDeYe sels. You don't need an after market wiring kit. I think there are only 4 wires to get the EFI working on a truck electrical system.

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I think it's likely a 521 frame with lengthened upper 720 control arms, if you look at the inside of the control arms real close you will likely find weld marks in the channel on the underside of the arms, they had to be lengthened at least a minimum of 5/8ths of an inch.

Also if you can get a socket on one of the bolt heads holding the upper control arms on it will likely be a 5/8ths socket, I have always told anyone doing it this way they should drill and tap them holes to except the 720 mount bolts, but right now I believe this is the only 521 truck(521 chassis) that has done it the way I did it, although I sold everything needed at the last Canby to do this balljoint modification to a 521 truck.

I do not know what the tie-rods look like on a 620 chassis, but the tie-rod in the second suspension photo sure looks like a 521 tie-rod.

We all ready know it is not a 720 chassis as the 720 chassis does not have the bumpstop mounts for the underside of the upper control arm, but the 620 did have them, but if it was a 620 chassis they likely would have left the 620 upper control arm.

I did mine this way and drove it for years, but I had an issue that I had to work thru, I also added power steering to my 521 a year or so later, this created other issues.

This was a driver until the engine gave up, correct?

 

 

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4 hours ago, datzenmike said:

If doing a KA get the Can Am box that Icehouse sells and the engine mounts that ]2eDeYe sels. You don't need an after market wiring kit. I think there are only 4 wires to get the EFI working on a truck electrical system.

 

Prob is I'm not starting with a clean harness to start with and it has a couple electrical issues, so I rather pull an entire new harness and update the entire vehicle at the same time + toss in some extras like a kill switch / easy room to expand. 

As far as swaps goes I am leaning towards the Beams 3SGE + boost down the line. 

 

2 hours ago, wayno said:

This was a driver until the engine gave up, correct?


I will be able to get a better idea though this winter as I pull the truck over to a garage and start going though it with my brother. It was running + driving just fine - then had a couple starter issues traced back to lose / corroded battery lines. Then more has unfolded - so rather than just trace though what it could be I rather pull the motor / sell the tranny / start on the swap to make it more reliable anyway. 
 

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Road trip with my brother this weekend to grab some doors from a 69.

 

eDyKZC1.jpg

 

7lD3nSz.jpg

 

 

primary rust free they come with a little bit of swag:

 

m9jazkc.jpg

 

(driver door has some small dents but also features a 9mm/38 hole from back in the day)

 

Guy had a great story about his project truck in the garage. It was his uncles / then his dads and then he sold it a decade ago. He tracked it down online in Portland - talked to the woman who owned it and bought it for more than he sold it for but finally has it back in the family. Nice guy

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Love your truck...

 

Thanks for sharing on here.

 

MikeC

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Thank's for the kind words Mike!

 

These arrived this week - new 14 circuit body harness from KwikWire and what will become my new high-beams (after some 3M treatment). 

 

Jb9ilav.jpg

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