goes2fast Posted January 6, 2010 Report Share Posted January 6, 2010 I noticed in another discussion someone said something about a difference in rear axle width on the early and later 620s. I tried a search and came up with nothing. Can someone tell me what year they changed, and what the demention difference is?:unsure: Quote Link to comment
datsunaholic Posted January 7, 2010 Report Share Posted January 7, 2010 It changed between the '77 and '78 model year. Reason was the different wheel offset needed for the balljoint front end geometry in the '78, so the axle was made slightly wider to match the front end width. Quote Link to comment
goes2fast Posted January 7, 2010 Author Report Share Posted January 7, 2010 Thanks, Anyone know how much wider the 78 and 79s are?:):cool: Quote Link to comment
goes2fast Posted January 8, 2010 Author Report Share Posted January 8, 2010 Thanks, Anyone know how much wider the 78 and 79s are?:):cool: All this collective knowlege and no one knows what the widths are?:rolleyes: Quote Link to comment
yello620 Posted January 8, 2010 Report Share Posted January 8, 2010 All this collective knowlege and no one knows what the widths are?:rolleyes: The difference is about 2.25" But i do not know the actual mnumbers for the two different axles. I swapped a 79 axle assemble into my 76 620, bolted right in without a problem. However the added width made the parking brake cable too short, so those are differnt as well. Quote Link to comment
goes2fast Posted January 10, 2010 Author Report Share Posted January 10, 2010 Bummer, if there is that much difference, I will have to get an early one for my KC to get my wheels to fit. There is only about 1/2 inch of clearance between the tires and inner fenders on my 76. Thanks for the info.:cool: Quote Link to comment
]2eDeYe Posted January 12, 2010 Report Share Posted January 12, 2010 Your 76 already has the narrow axle. Have you rolled the lips yet? I was able to get this much clearance on my 77. Quote Link to comment
goes2fast Posted January 12, 2010 Author Report Share Posted January 12, 2010 Thanks for the reply, The 76 is going to get sold, it's the KC I'm worried about. I have the same wheels already purchased for the KC that I have on the 76. I can't afford tires bigger than 16s, so I want to stick with what I had before, so I may have to go to the boneyard and get an earlier rear axle if they will not clear after rolling the lips. I didn't have to do it on the 76, so maybe they will fit. I had to do it on my 57 Chevy to get the 8" Corvette ralley wheels to clear.:cool: Quote Link to comment
]2eDeYe Posted January 12, 2010 Report Share Posted January 12, 2010 I know Jeff had to roll and flare his 79 to get his titans to fit. I guess it really depends on the wheel/tire package. Quote Link to comment
ggzilla Posted January 13, 2010 Report Share Posted January 13, 2010 So what is the 620 axle width? How many inches from outside of brake drum to other brake drum? Type 1 to Sep 1977 Type 2 from Oct 1977 to Dec 1978 Brake drums were different too Type 1 Type 2 Brakes shoes are the same, 10.00 X 1.75 Quote Link to comment
yello620 Posted January 13, 2010 Report Share Posted January 13, 2010 Thanks for the reply, The 76 is going to get sold, it's the KC I'm worried about. I have the same wheels already purchased for the KC that I have on the 76. I can't afford tires bigger than 16s, so I want to stick with what I had before, so I may have to go to the boneyard and get an earlier rear axle if they will not clear after rolling the lips. I didn't have to do it on the 76, so maybe they will fit. I had to do it on my 57 Chevy to get the 8" Corvette ralley wheels to clear.:cool: Dont forget that the front of the 79 is also wider than the 76 by about that same 2.25". 1.125" per side. Quote Link to comment
goes2fast Posted February 8, 2010 Author Report Share Posted February 8, 2010 I had to put 1in. spacers on the 76 for steering clearance, so the front of the 79 should be good with the same Yukon wheels, but thanks for the warning anyway.:) Quote Link to comment
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.