489 late series???

[LinceCuda]

I've been looking at pinion & gear sets with rebuild kit and I keep seeing " 489 late series ". What do I need to be looking for on my 489 case that would make it a late series? So I guess there would be a early series also what sets them apart?

[1 Wild R/T]

Just a guess but I think late series is implying it is a 489 not a 741/742/657 ..... Not aware of two series of 489's...

[RUNCHARGER]

Yep: 489 denotes late, 742 denotes early me thinks.

[Chryco Psycho]

Contact the supplier & ask what their definition is .
I Would contact Cass @ DR Diff in Montana for gears 

[RUNCHARGER]

Yes: Just talk to Cass for everything diff related. You can't go wrong, great, knowledgeable advice and good prices as well.

[LinceCuda]

Thanks guys and I'll check with the Doc on info and pricing.

[LinceCuda]

Cass at Dr. Diff answered the is my 489 case a early or late case. The answer is early because it is a 10 spline and the late 489 case is a 29 spline pinion. 

[Chryco Psycho]

There you go , matching up the yolk splines