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12-05-2003, 04:06 AM
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#1 |
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Registered User
Join Date: Jan 2000
Location: Bothell, WA
Posts: 548
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Lowering and pinion angle
Want to do a 4"/5" drop on my 72 LWB Cheyenne soon. Dropped spindles and lowered springs all around. My concern is the changes it will make in driveshaft angles. Truck is a 402/Th-350 combo and has a newly rebuilt/shortened two piece driveshaft. Do I need to be concerned about this and can any of you provide me with some advance input?
Thanks, Larry |
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12-05-2003, 04:57 AM
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#2 |
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Registered User
Join Date: Aug 2003
Location: Louisville, TN
Posts: 338
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Yes you need to be concerned with pinion angle as it will cause vibration, ideally the pinion needs to have between 0 and 3 degrees downward tilt (at the u-joint yoke) at ride height for a street truck.
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PR Too many projects, not enough time! 72SWB 350/350TH, 3500stall,525 lift cam 3:73 posi. Sold! 69LWB Flatbed 350/Super T-10, ported/polished 481 heads, 480 lift cam. 78SWB 468/400TH, ported/polished Alum. heads, 3:42 posi, 3000 stall on 17x8 and 18x9.5's 77 Jeep CJ-5 304V8 fiberglass body on 36" Ground Hawgs |
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12-05-2003, 10:51 AM
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#3 |
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CCRider
Join Date: Feb 2000
Location: Olive Branch,MS,USA
Posts: 2,232
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Yes it is a concern....I had a lowered 71 and it constantly ate rear u-joints....averaged two years between changes. You need wedges to change the angle. This page is for big trucks but has a lot of good imformation.
http://www.drivetrain.com/driveline_angle_problem.html
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72 GMC Sierra SWB almost finished---- 84 Softail Olive Branch MS |
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12-05-2003, 03:20 PM
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#4 |
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Project Junkie! Fishing Poor!!
 
Join Date: Dec 1999
Location: Olympia,Wa. 98512
Posts: 10,767
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Orence1. Did you notice that we have our drop spindles on sale? If you need a set you aught to come on down and take a look. Lifetime Gaurantee USA made drop spindles $194.95 per set. Lots of them in stock also. Just a FYI responce.
http://www.classicheartbeat.com/specials.htm WES www.ClassicHeartbeat.com
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On-line catolog Classic Heartbeat Pickup Parts WEHEPP@comcast.net Call us Toll Free (888) 338-2502 Like Us on Facebook No appointment necessary. 72 BB Chevy Custom Deluxe / Custom Camper 67 I-6 (Soon to be 5.7 LS1) Panel 68 BB Chevy Short Bed 72 6.0 LQ9 Short Bed Chevy 4X4 Olympia's fastest growing truck parts supplier. Olympia's home for Wayward Chevys |
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12-06-2003, 12:43 AM
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#5 |
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Registered User
Join Date: Jan 2000
Location: Bothell, WA
Posts: 548
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Thanks for the help guys. I will keep this in mind when I do the conversion. And Wes, thanks for the heads up on the spindles.
Larry |
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12-06-2003, 12:48 AM
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#6 |
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Registered User
Join Date: Mar 2003
Location: Bremerton, WA
Posts: 1,839
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No problem here.
Larry, After I dropped mine, I checked my pinion angle. Maybe I just got lucky, but it was within tolerance. Scott
get my pm?
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Silence is golden, duct tape is silver. - Scott |
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