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Expert
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Location: Valley Forge, Pa. | As I've rear, the best replacement rear would be a 1968-70 but a 1965-67 would work also. This can be from any C-body/full sized only MOPARs? Going through Craigslist, MOPAR rears are often listed by #s such as 489 or 724. Are these #s referring to the housings? Many rears are not listed by year or applications. So, are there any spacific designations/#s that I should be looking for as well as the actual year and model? Are they all 8 3/4s? Finally, my shop manual calls for a ratio of 331 or 354 a 1960 Powerflight with no spacific ratio for Suburbans. I'm guessing these ratios were no longer the standard rears in 1969 and were probably higher? How do the higher ratios work with a powerflight or would I need to change the ratio? Are the internal workings the same from the 1960 to a later case that, if needed, I could simply switch the guts?
Again, sorry but several times I have done "easy" projects that not having enough info turned out to be major pains.
Thanks again for your help,
Karl. |
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Expert
Posts: 3400
Location: Chestertown, NY ( near Lake George) | Those 3 digit numbers refer to the center section. Most later rears were 2.94or 3.23 out of reg. pass cars. With pf nothing under 3.23 as you really almost have a 2cnd gear start with the pf.
Edited by Shep 2014-09-28 3:38 PM
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Expert
Posts: 3779
Location: NorCal |
If your current axle is a Sure-Grip you could swap the center section into a '65-'69 housing but if it isn't Sure-Grip the later axle shafts will be too short.
In the '65-'69 era the 3.23 was found mostly with performance engines (383HP, 440HP), 2.76 was the standard axle ratio in may years with 2.94 also quite common. |
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Elite Veteran
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Location: ALABAMA, HEART OF DIXIE | rears are often listed by #s such as 489 or 724. Are these #s referring to the housings? QUOTE] Those numbers refer to the last three digit's of the diff carrier housing. The 489 came along in 1969 and indicates a slightly larger pinion bearing diameter. All 8 3/4 carriers are interchangable with all 8 3/4 housings. As stated before ..... you need a housing from a 66 -68 C body, (Ply, Dodge or Chrysler), to fit best in your 60. No need to worry about the case numbers. the smaller pinions as well as the larger will work great in your car.
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Expert 5K+
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Location: Perth Australia | Look Down
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Veteran
Posts: 131
| Would a rear form a '57 Chrysler work for him ? |
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Elite Veteran
Posts: 873
Location: ALABAMA, HEART OF DIXIE | 5wndwcpe - 2014-09-28 8:46 PM Would a rear form a '57 Chrysler work for him ?
Same issues with the tapered hubs, |
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Veteran
Posts: 131
| rockerarm - 2014-09-29 9:54 AM
5wndwcpe - 2014-09-28 8:46 PM Would a rear form a '57 Chrysler work for him ?
Same issues with the tapered hubs,
I understand that, I thought it might get him on the road sooner. What I meant was is the overall width and spring perch location the same from '57 to '60 ? |
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Expert
Posts: 1348
Location: Valley Forge, Pa. | I just got a pair of nice axles from John that will be going in for now. I was curious, someone said that they had read that you can use chalk on the tapered surface? Has anyone tried that, if so, did they feel it made any difference the next time?
I really appreciate all your info and advice.
Karl. |
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Expert
Posts: 3779
Location: NorCal |
This has been discussed before, the chalk adds gripping power to the taper...think chalk on a pool cue tip.
Although some here advocate applying anti-seize or grease to the taper "to make it easy to remove next time" it's poor shop practice. |
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If looking for a rear, where to start?
