jbirds510 Posted July 7, 2019 Report Share Posted July 7, 2019 Anyone know if the 521 and 620 dogbones and spindles will interchange? Are they pretty much the same 66-77? I have a 521 with a smoked kingpin and as many of you know the kingpin kits are rare and expensive. Can I bolt in 620 ones? Quote Link to comment
datzenmike Posted July 7, 2019 Report Share Posted July 7, 2019 I don't think the pin kits are the same either and the actual dog bone part numbers are way different. I would ask Mike (Mklotz70) on here. https://ratsun.net/profile/11-mklotz70/ I think if they were someone would have done this and I would have heard something. 1 Quote Link to comment
jbirds510 Posted July 7, 2019 Author Report Share Posted July 7, 2019 Will the upper lower and dogbone swap over to a 521 frame as a unit? 1 Quote Link to comment
jbirds510 Posted July 7, 2019 Author Report Share Posted July 7, 2019 I know king pin guys are swapping to ball joint on 620’s so I guess what I’m asking is can I swap all the 620 kingpin shit onto a 521 frame? 1 Quote Link to comment
mklotz70 Posted July 8, 2019 Report Share Posted July 8, 2019 UCA's and LCA's will swap with some minor differences since the 620 is metric. Just swapping the dogbone on the arms should work too. Here's the differences with the lower fulcrum pin 2 Quote Link to comment
banzai510(hainz) Posted July 8, 2019 Report Share Posted July 8, 2019 (edited) find another 521 and cut the dogbone set out and have it redone. 521 kits are still avail overseas 521 is SAE 620 stuff is Metric Edited July 8, 2019 by banzai510(hainz) 2 Quote Link to comment
jbirds510 Posted July 9, 2019 Author Report Share Posted July 9, 2019 Ok so I picked up a frame from a 73 620 the guy cut off just aft of the torsion bars. Kingpins are tight! Gonna just use the dogbone/king pin and spindle for my completely blown out one. Got the whole clip for 100 bucks. Hope it works, if not I’m not really out a heck of a lot and got to meet a pretty awesome Datsun guy in the process! 2 Quote Link to comment
jbirds510 Posted July 9, 2019 Author Report Share Posted July 9, 2019 23 hours ago, mklotz70 said: UCA's and LCA's will swap with some minor differences since the 620 is metric. Just swapping the dogbone on the arms should work too. Here's the differences with the lower fulcrum pin Thank you 🙏 @mklotz70 2 Quote Link to comment
jbirds510 Posted October 30, 2019 Author Report Share Posted October 30, 2019 follow up... 620 bones bolt right in, so now it has a little metric in there but really nbd. works titties! no more wheel wobble. 1 thing i did have to do was remove the sae brake line end to metric thread because i retained the 620 brakes along with the bones as they were better. 4 Quote Link to comment
mklotz70 Posted October 31, 2019 Report Share Posted October 31, 2019 Sweet. Glad to hear this. I've told people for years that this would work since it's a lot easier to find good 620 dogbone/kingpins in the scrapyards. You're the first I've heard that actually did it. :) 2 Quote Link to comment
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