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View Full Version : Ford 8.8 Centerline to Pinion Dimension


yellowoctupus
November 1st, 2017, 16:29
Does anyone know where to find dimension "A" for an 8.8 in the picture below? Or, "G"?

https://s5.postimg.org/kc9javg53/piniondimension.jpg

I 'built' a rear end at the junkyard the other day by taking Crown Vic 3.08 Gears and putting them on a '97 disc brake Explorer 3L55 carrier (to get disc brakes, the 'highway' ratio and a limited slip), but forgot to measure the 3.55 pinion+spacer so now I don't have a don't have a starting reference point for my pinion setting.

Ratech makes a funny little offset tool that you can use, but I think it would be more accurate to put a parallel across the bearing cap mount or even across the low point that they reference rather than just to one side. http://www.powerperformancenews.com/wp-content/uploads/sites/4/2015/10/REAR-10.jpg

RCP Phx
November 1st, 2017, 17:18
At this point, you would be better off just setting them up as a "new install".
You should have at least pulled a pattern first!

yellowoctupus
November 1st, 2017, 19:49
Yes, I am considering this as a 'new install' at this point. The Ford manuals show setting up the pinion depth first with their fancy gauge; I'm trying to explore other options. I think their setup is a bit 'over the top' for a relatively simple measurement.

What good would have it been to 'pull a pattern'? The 3.55 gears looked like they were very clean, centered patterns, etc, but like I said, I didn't measure them before leaving them at the 'yard.

yellowoctupus
November 1st, 2017, 19:59
I'm looking for this type of info, but for the 8.8 of course.

https://lib.americanmuscle.com/files/contentgenerator/gears-456-88-front-manu-install.html/9716-Truck-Motive-8.8in-Ring-Pinion-4.56-001.jpg

https://lib.americanmuscle.com/files/contentgenerator/gears-456-88-front-manu-install.html/9716-Truck-Motive-8.8in-Ring-Pinion-4.56-002.jpg

http://www.onallcylinders.com/wp-content/uploads/2012/07/tech14_ma02-rearaxle22.jpg

yellowoctupus
November 1st, 2017, 22:28
:party:


PDF Including most common pinion dimensions from TD Machine, who makes a very nice pinion checking tool:

http://www.tdmach.com/Deluxe%20Pinion%20Checker%2011148.pdf