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Old 09-21-2020, 11:43 AM   #1
blazer2007
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pinion angle is this right ?

Merged your two posts.

Last edited by AussieinNC; 09-23-2020 at 07:46 AM. Reason: Duplicate request
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Old 09-21-2020, 12:08 PM   #2
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Re: pinion angle is this right ?

Forgot to mention is 454/450 auto setup
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Old 09-22-2020, 10:34 AM   #3
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Re: pinion angle is this right ?

Oops ,should have put this in engine drivetrain section
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Old 09-22-2020, 08:18 PM   #4
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pinion angle ,will this work

Getting spring pads welded on a Ford 9 inch for my 78 2 wheel dr. Blazer with a AOL bag set up. Current angles at ride height now are 5 -tranny 3.5 Dr.shaft 1 at pinion, all down. This has worked for over 15 years. I know this wrong but at the time when I flipped the rearend we just welded on new pads sorta even with the old pads. Now I sorts understand the pinion angles, so If I get the new pads on the 9 in. welded at 5 down and have 5 still at the tranny, will I still have 3.5 at the driveshaft. If so, this should work giving me a working angle of 1.5 at both ends. I do have room to shim the tranny. Is a454/450 hp with T. 350
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Old 09-24-2020, 09:05 AM   #5
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Re: pinion angle is this right ?

anyone ?
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Old 09-24-2020, 11:21 AM   #6
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Re: pinion angle is this right ?

pics???
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Old 09-24-2020, 01:33 PM   #7
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Re: pinion angle is this right ?

You def dont want 5deg down on pinion angle...
like kw...some pics might help..
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Old 09-24-2020, 04:05 PM   #8
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Re: pinion angle is this right ?

Not an expert on this but from what I learned chasing a vibration problem I once had is you want the angle at one end to cancel out the angle at the other end. So if the trans tailshaft is angled down 3 degrees you want the pinion on the rear to angle up 3 degrees. If you drew a line following the angle out the tailshaft and one out the differential following the pinion angle they should run parallel and never touch.
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Old 09-24-2020, 04:57 PM   #9
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Re: pinion angle is this right ?

Quote:
Originally Posted by garyd1961 View Post
Not an expert on this but from what I learned chasing a vibration problem I once had is you want the angle at one end to cancel out the angle at the other end. So if the trans tailshaft is angled down 3 degrees you want the pinion on the rear to angle up 3 degrees. If you drew a line following the angle out the tailshaft and one out the differential following the pinion angle they should run parallel and never touch.
That is a great way of explaining it! Thanks
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Old 09-24-2020, 09:06 PM   #10
blazer2007
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Re: pinion angle is this right ?

So pinion should be up 5 degrees. Pics would not help. I don,t have lift
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Old 09-24-2020, 09:10 PM   #11
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Re: pinion angle is this right ?

Correct..pinion up, trans down...but I would personally shoot for trans down angle 3deg..pinion up angle 3deg..
That's how I do mine when starting from scratch.. 3 and 3
Since your on bags I assume your riding low..you also want to avoid no ujoint angle..
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Old 09-25-2020, 08:58 AM   #12
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Re: pinion angle is this right ?

Thanks, I was getting mixed up on how some people talk about slope when doing your math on operating angles
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