Dudeman Posted June 17, 2009 Report Share Posted June 17, 2009 So in the near future I'm planning on upgrading the front brakes on my '79 620 to hardbody rotors (drilled and slotted of course :D) and calipers, as well as Isuzu rears with fineline's brackets, and figure while I'm at it might as well replace worn out steering and suspension components. My question is am I able to use OEM 620 ball joints, or do I need hardbody ones? Is there even a difference? I'm wondering the same thing about bearings as well. All the research I've done indicate that the front brakes are a bolt-on affair, has anyone run into any trouble getting it to work? As always help and advice is appreciated! Quote Link to comment
yello620 Posted June 18, 2009 Report Share Posted June 18, 2009 You need to use the stock ball joints. The mounting stud on the ball joint is identical to the hardbody. The HB ball joint won't mount to the stock 620 arm though. In order to run the HB calipers, you need to run the HB spindles too, the caliper mounts different. While you are at it, make sure that you use rotors and calipers from a 2wd v-6 hardbody. Quote Link to comment
Dudeman Posted June 18, 2009 Author Report Share Posted June 18, 2009 (edited) Ya as soon as I get paid I'm going to hit the junkyards in search of some spindles and two piston calipers to rebuild. Any idea of a good master cylinder to use when running four wheel discs? I suppose one from anything with discs all around would work, but is there anything in particular that is easy to find/mount on a 620 firewall? And what are your 3.70 gears out of? Seems a bit tall, but I do want to gear up at some point, do you like your 3.70's? Gracias for the info man. Edited June 18, 2009 by Dudeman Quote Link to comment
slodat Posted June 18, 2009 Report Share Posted June 18, 2009 early (79-81) 280zx is a good candidate. Quote Link to comment
yello620 Posted June 18, 2009 Report Share Posted June 18, 2009 early (79-81) 280zx is a good candidate. The early 79-81 280zx master is a 15/16" bore, designed for four wheel disc, and bolts directly onto a stock 620 booster. Maybe i should say it bolted right onto my 76 booster and should fit other years as well. As far as my gears, I have been through several sets of gears in this truck now. Originally i had the stock 4.375, Those were changed out in favor of a set of 4.11 gears. The 4.11's were a waste of time, not even close to enough change. Next came a set of 3.70's from a 85 720. Incredible improvement in interior noise, but a little too much gear, had to feed it a little too much skinny pedal on the highway to keep it going, but it was happy to cruise at about 80mph. Currently in the truck for about three weeks now is a set of 3.90 gears with aluminum carrier from a 510 wagon. These are by far the best gears yet. Comfortable cruise rpm's, still quieter than stock inside, and i dont seem to have to feed(fuel) as bad on the highway. And i still cant find the top speed where i run out of gear or motor.:cool: Quote Link to comment
Dudeman Posted June 18, 2009 Author Report Share Posted June 18, 2009 3.90 gears sound about right, that's probably what I will be doing eventually. When you say they were out of a 510 wagon do you mean a '78 or later? Do they come with H-190's? My buddy has a 78 510, maybe he'll want to get rid of his gears and throw some 4.375's in it :D Quote Link to comment
yello620 Posted June 19, 2009 Report Share Posted June 19, 2009 My 3.90 gears came from a 71 or 72 i think(early car). You have to swap the spider gears for the truck axles. The wagons have a smaller diameter axle than the trucks. Quote Link to comment
Farmer Posted June 20, 2009 Report Share Posted June 20, 2009 So in the near future I'm planning on upgrading the front brakes on my '79 620 to hardbody rotors (drilled and slotted of course :D) and calipers, as well as Isuzu rears with fineline's brackets, and figure while I'm at it might as well replace worn out steering and suspension components. My question is am I able to use OEM 620 ball joints, or do I need hardbody ones? Is there even a difference? I'm wondering the same thing about bearings as well. All the research I've done indicate that the front brakes are a bolt-on affair, has anyone run into any trouble getting it to work? As always help and advice is appreciated! Im doing that setup also. Use Stock ball joints. Rockauto shows that the HB, up to 94, uses the same bearing as the 78-79 620. But you need the oil seal from a HB. Ive change the spindles, rotors, calipers and wheel hub. All hard body. I have pics in my build thread in my sig. line Good luck. Larry Quote Link to comment
Dudeman Posted June 21, 2009 Author Report Share Posted June 21, 2009 Badass build, I love the powdercoating, and that is almost exactly the set up I want to run. Another question, though, is what size wheels are you guys running? I have 15'' toyota 4x4 rims, and some of what I've read indicates a 15'' rim will fit the 10.8'' hb rotors/calipers and some people say I need 16's. Yello620, I see you have a set of Frontier rims for sale, if I need a bigger rim and they're still for sale when I get paid I may be PMing you. If my 15's work though I'll prolly stick with them (they don't look half bad). Thanks all for the help, this forum and everyone on it are the shit. Quote Link to comment
yello620 Posted June 22, 2009 Report Share Posted June 22, 2009 I ran 15" wheels with the HB brake upgrade. They fit fine. Nissan installed 14" wheels with the HB trucks, even the v-6 trucks had 14" wheels stock. Quote Link to comment
Dudeman Posted December 15, 2009 Author Report Share Posted December 15, 2009 Finally got all the parts for the swap except HB spindles and hubs. I called all the local salvage yards and have found 4 cylinder spindles (which i have been told will work) but no hubs (which have to be from a V6). Anybody have any ideas as to where I might be able to find hubs? Might just be a matter of looking till I find em, but I figured I'd post on here to see if anyone had any ideas. Thanks Quote Link to comment
yello620 Posted December 16, 2009 Report Share Posted December 16, 2009 4cyl hubs work also, you just have to install the v-6 rotors on them. Quote Link to comment
Dudeman Posted December 16, 2009 Author Report Share Posted December 16, 2009 thats good to hear. The dude at the j/y said they were different, but I'll get the 4cyl hubs. Thank You Quote Link to comment
yello620 Posted December 16, 2009 Report Share Posted December 16, 2009 I have used the 4cyl hubs with the v-6 rotors on 4cyl spindles and it all worked fine. If you do find a difference, or the JY knows the difference, I would like to know about it. Quote Link to comment
Dudeman Posted December 17, 2009 Author Report Share Posted December 17, 2009 The guy at the junkyard said that because the rotors are different he was pretty sure the hubs were different as well. But he didn't seen over confident in that, and I would trust that you are more knowledgeable on the subject than he is. Either way I'll let you know in the next few days Quote Link to comment
slodat Posted December 18, 2009 Report Share Posted December 18, 2009 The rotors are different, but the hub is the same... Quote Link to comment
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