489 Cases

[BronzeOnSteelies]

Is it true that 489 Case rear ends only came on 69 and later cars?

If so what would an 8-3/4 1968 take.

[no318]

742 case for 68 RT

[John_Kunkel]

The 489 case appears in the '68 parts book so it must have been available late in the '68 model year.

[Ghoste]

Hey John, I can't find it in my 68 book.  Can you point me where to look (page number assuming we have the same edition, mine is Sept 67)?

[John_Kunkel]

Mine's dated April 1968, text page 3-3, code 3-03-3:

CARRIER, w/CAPS w/ 8 3/4" gear, w/casting No. 2881 489, used with Collapsible Spacer Type Axle   *2881 098

The asterisk denotes a change or addition so I assume the 489 was introduced in or about April '68.

Code 3-19-0 Drive Gear and Pinion set lists the 1 7/8" stem available in only 2.76, 3.23 and 3.55 ratios but in all body types.

[Ghoste]

Must be, mine doesn't differentiate between casting numbers, it just shows the 741 and 742 based on pinion stem diameter without indicating the casting.  I have some tech bulletins someplace so I'll do a check there to see if one one them indicates an introduction date but I don't think my 68 set is complete.  Not that it's important but it would be interesting to know when the change was made now that the topic has come up.