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Topic: What pinion angle to use on 84 cougar? (Read 297 times) previous topic - next topic

What pinion angle to use on 84 cougar?

I'm chasing a drive line vibration which I suspect could be caused by the pinion angle being off. I have the lower arms with the eccentric adjustable oval bushings. When I rebuilt the entire rear end suspension and added lowering springs, I may have not set the angle correctly.  Any one have pinion angle specs for an 84 Cougar?
84 COUGAR/90 HO, 1.7RRs, performer RPM,700DP, equal length shorties, stainless EXH ,T-5,Hurst pro-billet, KC clutch, 8.8/ 4.10s, line-lok, bla ,bla, bla.
71 COMET/289,351w heads, 12.5 TRWs, 750DP, Liberty TL, 9"/6.00s, 11.9x @112 , bla,bla,bla.

Never shoot your mouth off, unless your brain is loaded! ....I may get older, but I'll never grow up!....If you're not laughing, you're not living!  :laughing:

What pinion angle to use on 84 cougar?

Reply #1
Should be between 0 and 4 degrees IIRC.

Check the driveshaft for weights...that could be causing rotational vibration.

What pinion angle to use on 84 cougar?

Reply #2
Quote from: EricCoolCats;467150
Should be between 0 and 4 degrees IIRC.

Check the driveshaft for weights...that could be causing rotational vibration.

Thanks Eric.
84 COUGAR/90 HO, 1.7RRs, performer RPM,700DP, equal length shorties, stainless EXH ,T-5,Hurst pro-billet, KC clutch, 8.8/ 4.10s, line-lok, bla ,bla, bla.
71 COMET/289,351w heads, 12.5 TRWs, 750DP, Liberty TL, 9"/6.00s, 11.9x @112 , bla,bla,bla.

Never shoot your mouth off, unless your brain is loaded! ....I may get older, but I'll never grow up!....If you're not laughing, you're not living!  :laughing:

What pinion angle to use on 84 cougar?

Reply #3
What speed or RPM is the vibration happening at? When I went to 3.73 gears I never got the stock driveshaft to balance. I ended up having to replace the stock driveshaft with a 3.5" diameter aluminum driveshaft.
88 Thunderbird LX: 306, Edelbrock Performer heads, Comp 266HR cam, Edelbrock Performer RPM intake, bunch of other stuff.

What pinion angle to use on 84 cougar?

Reply #4
It's more harmonic than vibration. I thought it was the front tires, but after upgrading to sport comps, its still there.
84 COUGAR/90 HO, 1.7RRs, performer RPM,700DP, equal length shorties, stainless EXH ,T-5,Hurst pro-billet, KC clutch, 8.8/ 4.10s, line-lok, bla ,bla, bla.
71 COMET/289,351w heads, 12.5 TRWs, 750DP, Liberty TL, 9"/6.00s, 11.9x @112 , bla,bla,bla.

Never shoot your mouth off, unless your brain is loaded! ....I may get older, but I'll never grow up!....If you're not laughing, you're not living!  :laughing:

What pinion angle to use on 84 cougar?

Reply #5
Did the vibration start with the 4.10s? Does it only happen at a certain speed? Can you go faster and the vibration/harmonic goes away?
88 Thunderbird LX: 306, Edelbrock Performer heads, Comp 266HR cam, Edelbrock Performer RPM intake, bunch of other stuff.