Pinion Angle Help
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Mountain Pass
Joined: Jun 2006
Posts: 197
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Pinion Angle Help
My wife has a 72 bronco that had a lift when she bought it. It looks to me like a 3.5" lift. Regretably, it has blocks in the rear. It has always "crow hopped" like a real bronco (if you are hard on it and the doors are off, it will bounce you out) when starting in first or reverse (my wife called it her theft deterent system). Because some of the spline was showing on the slip joint, I lengthened the drive shaft. Now I am wondering if the pinion angle is correct. Exactly how is it measured? And what angle am I looking for. I dont want to put any money into the rig so I will just use shims to fix it. Someone told me the crow hopping could have been partially caused by the 3.50 rear end. True? I think it needs a traction bar. Any aftermarket?
Cargo Master
Joined: Mar 2003
Posts: 2,333
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Here is an article about pinion angle:
http://classicbroncos.com/pinion_angle.shtml
I'm not entirely sure what "crow hopping" is but if it has a V-8 it will launch hard, especially with deep gears.
My first Bronco was a 69 with 302 and I could pull the front end off the ground from a stand still. Real cool until I blew the spiders in the rear axle.
If you have a weak throttle return spring and you are trying to maintain a constant throttle position, the jerking action become increasingly magnified and before you know it the car is trying to give you whiplash.
http://classicbroncos.com/pinion_angle.shtml
I'm not entirely sure what "crow hopping" is but if it has a V-8 it will launch hard, especially with deep gears.
My first Bronco was a 69 with 302 and I could pull the front end off the ground from a stand still. Real cool until I blew the spiders in the rear axle.
If you have a weak throttle return spring and you are trying to maintain a constant throttle position, the jerking action become increasingly magnified and before you know it the car is trying to give you whiplash.
Postmaster
Joined: Dec 2002
Posts: 3,594
Likes: 2
From: Southern Oregon USA
If you still have the blocks in the rear they can cause wheel hop problems.
Adding shims to them may increase the problem.
I'm not positive, but I think that the factory pinion angle is about 2 deg.
Jason
Adding shims to them may increase the problem.
I'm not positive, but I think that the factory pinion angle is about 2 deg.
Jason
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Mountain Pass
Joined: Jun 2006
Posts: 197
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Thanks for the info. Call it crow hopping because as you ease the clutch out the rear end starts hopping up and down. Like a raven running the beach chasing salmon heads. Kinda like when you run a four wheel drive in deep, compressed snow and it starts hopping. If I pop the clutch and get the wheels to slip, I dont have the problem. Just when I am easing into it, and yes it slams up and down. I figure with your input that it is just having a crappy lift with blocks and tired leaf springs, all with the 3.50 rear end.
