What was the first year for 28spline axels was is 87 or 89?

 

Mid '88

 

INCORRECT -1989 was the changeover year and it was not on 100% of the cars that year..

 

Strange... I could have sworn the changeover was '88 - I've got two rear ends, one a late '87 (26 spline) the other original off a late '88, and it's 28. Maybe it was an '89, then?

 

From my readings, it also depended on what production line (f-body, s10, astro,etc).

I belive on f-bodys it was mix in 88, full in 89.

 

The mix was in 1989. I have parted out enough of these cars to notice this. 1988 is 26 splines and 1990 is 28 splines. 1989 is a lottery. Good luck!

 

i just got my slp take out posi he he im so happy and yesterday i ordered my sphon torqe arm and crossmember.. slp take out you must have 28 spline .. i have a 90 so it will bolt right in.

 

You will like that unit. They are so0o much better then a posi unit (clutch/cone type) on the street. I even ran a locker for a while. Killer traction but got tired of the noise and jerkyness.

I have another vehicle with an Eaton clutch type posi in it and am thinking of switching to a Torsen unit.

RBob.

 

What kills me is I can't find 28 spline axles in any junkyards around here. It's rare to find a 90-up f-body in a Central NJ wrecking yard. I found one, a v6 car- that would've been sweet, I know the axles wouldn't have been twisted- but the f'ing pinion lock bolt snapped. After two days of lying in the "junkyard funk" (moldy mud/bugs/spiders/glass/etc) screwing with a hammer and a set of chisels and picks, I gave up.

So my only option is to spend $300 on the Moser set... OR, spend $500 for a brand new posi. Man. Decisions, decisions...