Cuts metal like mad Posted July 13, 2008 Report Share Posted July 13, 2008 Ok so heres the deal... I'm too lazy "right now" to install a disc front setup... so I think new wheels cylinders and shoes will be in order... but I found so much contradicting information I am getting frustrated... some sources say that the front and rear wheel cylinders are different between 73-79, BUT both my haynes and chiltons say that the front of all 73-77 front drum trucks use the same wheel cylinders and the rear of all 73-79 trucks use the same rear wheel cylinders... anyone know for a fact what the truth is? Thanks guys... 510s are so much easier... :D Quote Link to comment
yello620 Posted July 13, 2008 Report Share Posted July 13, 2008 Zuum, I have an old raybestos catalog that has part numbers for the 72-76 620. This catalog does not list the 77-79 trucks. I cant find my newer catalog right now. 72-76 620 Right front cylinder #37381 3/4" bore Left front cylinder #37382 3/4" bore Rear cylinders #37307 11/16" bore This book also lists many other brake parts back to the 520, it also lists the shoes for the NL320. Jason Quote Link to comment
yello620 Posted July 13, 2008 Report Share Posted July 13, 2008 Zuum, my memory tells me that the cylinders were the same for the 72-77 620 and that they changed rear cylinders in 78 when they went to disc brakes on the front, but i only have numbers for the 72-76 trucks. Jason Quote Link to comment
Cuts metal like mad Posted July 13, 2008 Author Report Share Posted July 13, 2008 right on bro! I also looked at autozones part #s and the front numbers are the same from up to 77, but the rears for the 77 are different... according to them, bu it could also be a mid year thing cause nissan is famous for pulling that trick on us. :D Quote Link to comment
yello620 Posted July 13, 2008 Report Share Posted July 13, 2008 right on bro! I also looked at autozones part #s and the front numbers are the same from up to 77, but the rears for the 77 are different... according to them, bu it could also be a mid year thing cause nissan is famous for pulling that trick on us. :D I would then to think that i would change at the same time as some other change in the brake system. IE front disc. But your right Nissan did do a few weird changes on mid year stuff. Jason Quote Link to comment
datzenmike Posted July 14, 2008 Report Share Posted July 14, 2008 '70 through '77 used a 3/4" master cylinder. '78 and '79 changed to 13/16" '83-'83 used 7/8" Quote Link to comment
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