26 or 28 spline

[Kyle]

my truck is an 89 \'\'cameo el\'\' package, not sure what it had originally as far as an engine but i was a 5 spd, anyway to tell without taking the rear cover off if its a 26 or 28?

[Knanthrup]

it\'s a 7 5/8 28 spline

82-84 were 7.5 26 spline

85-88 were 7 5/8 26 spline

\'89-up were 7 5/8 28 spline



atleast thats how i remember it

[ZZ4Blazer]

Actually to my understanding, there is no size difference. They are all 7.5\" parts.



Gm just designated the 28 spline axle rear ends as 7 5/8\".



So, theres really not a 26 spline 7 5/8\"

[Knanthrup]

On 2005-05-01 03:01, ZZ4Blazer wrote:

Actually to my understanding, there is no size difference. They are all 7.5\" parts.



Gm just designated the 28 spline axle rear ends as 7 5/8\".



So, theres really not a 26 spline 7 5/8\"



Actually there was a little difference Jim. It\'s not enough for people to really know or talk about, but the interior dimensions of the 7 5/8 are actually slightly larger than the 7.5. The exterior of the carrier is the same.



Only reason I bring it up is that I found this out the hard way when I purchased a Powertrax locker unit for my \'84 thinking that the unit labeled 7 5/8 26 spline would fit just fine but turned out it didn\'t. I couldn\'t get the last piece slid in because the inside of my carrier was too small, yet the axle splines matced up fine. A quick call to tech delivered the bad news. That\'s when I just said f*ck it and ditched the whole 10 bolt rear idea http://www.s10v8.com/images/smilies/icon_wink.gif

[Knanthrup]

Anyways, for 95% of people it won\'t matter to distinguish between them, but if you\'re looking to add aftermarket internal pieces like a powertrax or lockrite then you would have to get the right one

[adh383]

Knanthrup- need some info----when you put that 8.8 in your truck--did you ues the ford U bolts and ford plates that the shock hooks on?

[Knanthrup]

On 2005-05-01 20:37, adh383 wrote:

Knanthrup- need some info----when you put that 8.8 in your truck--did you ues the ford U bolts and ford plates that the shock hooks on?



Actually I used the ones from my 7.5 rear. However, they were aftermarket bolts that came with my lowering blocks (dont use the blocks anymore). It was a real tight fit over the axle, but i tapped them on with a rubber hammer.



The shock plates I used were my stock ones, the ford shocks mount differently so Ididn\'t use those.



If you can\'t get your stock U-bolts to fit over the axle, you could probably just use the ford U-bolts and drill new holes (wider) in the stock shock plates.

[mzoomora]

On 2005-05-01 03:01, ZZ4Blazer wrote:

Actually to my understanding, there is no size difference. They are all 7.5\" parts.



Gm just designated the 28 spline axle rear ends as 7 5/8\".



So, theres really not a 26 spline 7 5/8\"



The only difference is the spline count and the interior dimensions of the case. Powertrax is the only company that lists a 26 spline 7.6. From somebody that has sold many hundreds of internal kits, it doesnt exist. Look at any parts site and they will not list a 7.6 26 spline in anything except a lock-rite. Even GM themselves only sells parts for 7.6/28 or 7.5/26. An 84 truck should have used a 7.5 26 spline kit, a 7.6 kit would be too large.

[Knanthrup]

On 2005-05-01 21:14, mzoomora wrote:

<!-- BBCode Quote Start --><TABLE BORDER=5 bordercolor= ALIGN=CENTER WIDTH=85%><TR><TD><font size=-5>Quote:</font><HR></TD></TR><TR><TD><FONT SIZE=-10><BLOCKQUOTE>

On 2005-05-01 03:01, ZZ4Blazer wrote:

Actually to my understanding, there is no size difference. They are all 7.5\" parts.



Gm just designated the 28 spline axle rear ends as 7 5/8\".



So, theres really not a 26 spline 7 5/8\"

</BLOCKQUOTE></FONT></TD></TR><TR><TD><HR></TD></TR></TABLE><!-- BBCode Quote End -->

The only difference is the spline count and the interior dimensions of the case. Powertrax is the only company that lists a 26 spline 7.6. From somebody that has sold many hundreds of internal kits, it doesnt exist. Look at any parts site and they will not list a 7.6 26 spline in anything except a lock-rite. Even GM themselves only sells parts for 7.6/28 or 7.5/26. An 84 truck should have used a 7.5 26 spline kit, a 7.6 kit would be too large.



yup, exactly the problem i ran into. funny because chances are you\'d never even know.