Alright guys, there is no one place that I've found a "how-to" to buy the necessary parts to step up to 30 spline axles and a stock style Eaton Posi unit.
I need input from those who know. We can use this thread from now on..... so guys that know.... contribute please....
Fact: GM has discontinued the 28 spline clutch kits. I understand repalcement clutch kits are nearly non-existent at this point.
Fact: GM did make certain later model vehicles with a 8-1/2" 30 spline Eaton posi that I think would work in our cars with some modifications.
Where I need help is what is required to go with the posi.
I "think" the posi is a 19559-010 Eaton.
I "think" you must also change out the carrier bearings. I don't know the part number
I "think" that Moser is making a "drop-in" 30 spline axle thet would make this easier to do.
A103004 - This is supposed to be a "direct-fit" Moser axle set for a GN converted to 30 splines
Copy and pasted off a thread on v8buick.com by member "monzaz" He appears in many posts and appears to know what is going on.
On Cotton's website, they advertise the 30 spline Eaton carrier but have a disclaimer that it requires the larger carrier bearings.
Can we get some of the rear end folks that have done this to chime in and make this thread more valueable?
I need input from those who know. We can use this thread from now on..... so guys that know.... contribute please....
Fact: GM has discontinued the 28 spline clutch kits. I understand repalcement clutch kits are nearly non-existent at this point.
Fact: GM did make certain later model vehicles with a 8-1/2" 30 spline Eaton posi that I think would work in our cars with some modifications.
Where I need help is what is required to go with the posi.
I "think" the posi is a 19559-010 Eaton.
I "think" you must also change out the carrier bearings. I don't know the part number
I "think" that Moser is making a "drop-in" 30 spline axle thet would make this easier to do.
A103004 - This is supposed to be a "direct-fit" Moser axle set for a GN converted to 30 splines
Copy and pasted off a thread on v8buick.com by member "monzaz" He appears in many posts and appears to know what is going on.
-28 spline axles are stock in GM 8.5 till 1989. Grand National was one of the last performance 28 spline Rwd vehicles ...
-1990-1998 8.5 10 bolt were 30 spline c-clip rears
-1999-2009 8.6 were 30 spline axles and had larger carrier bearings (same size as the 12 bolt chevy of old.) A36 bearing set.
SOME eaton posi units can be converted to 30 spline from 28 BUT the carrier case where the axle slides into the side gear through needs to be machined larger...AND since they already build 30 spline units this would really be redundant in a way...definitely NOT cost effective.
30 spline is as big as the 71 72 BUICK 8.5 rear can be made with the bearing A9 712146 seal. But if we used the A10 bearing and matching seal we could build a 33 spline wagon rear...that would be cool and stealthy...anyone want to front some money for that fun build...
On Cotton's website, they advertise the 30 spline Eaton carrier but have a disclaimer that it requires the larger carrier bearings.
Can we get some of the rear end folks that have done this to chime in and make this thread more valueable?
