• Welcome Visitor! Please take a few seconds and Register for our forum. Even if you don't want to post, you can still 'Like' and react to posts.

Pinion splines?


Otis413

Well-Known Member
Article Contributor
Joined
Jun 2, 2018
Messages
187
City
Cass, WVa
Vehicle Year
2004
Transmission
Automatic
Are all 8.8 pinion shaft splines the same? (30 spline 1.626" dia.?) and are all 7.5s 28 spline? I'v found conflicting info on the 'net, and I know it's easy for people not that familiar with them to confuse the two (I did the first time I had to buy axle bearings, long story) most of the R&P sets I am looking at don't list any info on the pinion splines, just list as for a ford 8.8 rear.
Anyway, I just wanted to make sure before ordering a R&P set, this will be my first complete rebuild (8.8 from a '98 Explorer, turns out it has trashed bearings and worn pinion teeth) for my 04 Ranger, I can't find a good used 4.10 Ranger rear axle anywhere near where I live...
Thanks for your help!
 
I don't remember the pinion spline count. However, I would like to mention that it is easy to confuse spline counts. Many times, we talk about spline count for an axle. Most of thevtime. We are talking about the number of sites on an axle shaft where it slides into a side gear within the differential. In this case, the 7.5" axle and many 8.8" axles have 28 splines while some 8.8" axles have 31 splines. This is totally separate from the number of splines on the pinion shaft where the flange for the u-joint is mounted.
 
Yes, I'm asking about the pinion splines for the drive shaft flange, I read somewhere that some cars with 8.8 rears had 28 spline pinions, but I think maybe they actually had a 7.5 rear and just confused the two.
Just want to make sure before I order anything, waiting on my tax return anyway....
EDIT: Mine is 30 spline BTW.
 
Last edited:
According to our tech library, the 7.5" has 28 pinion splines and the 8.8" has 30 pinion splines.
 

Sponsored Ad


Sponsored Ad

TRS Events

Member & Vendor Upgrades

For a small yearly donation, you can support this forum and receive a 'Supporting Member' banner, or become a 'Supporting Vendor' and promote your products here. Click the banner to find out how.

Recently Featured

Want to see your truck here? Share your photos and details in the forum.

Ranger Adventure Video

TRS Merchandise

Follow TRS On Instagram

TRS Sponsors


Sponsored Ad


Sponsored Ad


Amazon Deals

Sponsored Ad

Back
Top