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#1 |
Registered User
Join Date: Feb 2002
Location: Gilmer, Texas USA
Posts: 313
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Penion Angle Help
I am welding a f@rd rear disc brake 9 inch rear in my 68 short wide truck. The width is exactly 66 inches like the stock rear and the bolt pattern is correct for the Bell Tech spindles and front discs that will follow.
I need to know what angle to set the rear end up on. The rear has been lowered 5 inches and it may get bags later. Is there a standard degree that you set it on or how do you go about determining this. I have a angle tool for checking the penion, just don't know what to set it on.
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69 Chevy short fleet side soon to have LT1 and 4L60E pb. ps cruise and air. 68 Chevy short fleet side 400 sb 5 inch chop top pb. ps. pw. 350 auto and shaved handles 68 anniversary no engine long wheel base 400 auto FOR SALE 68 Chevy fleet side long wheel base complete parts truck. |
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#2 |
I finally got an avatar
Join Date: Jan 2003
Location: Cheney, WA
Posts: 180
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Never had todo one in a lowered truck(my rear is stock), but in lifted rigs, I always set them up to the angle at the trans and at the axle are exactly the same. On my Trooper any more than 2* of difference between the 2 will cause nasty vibes. If you're leaving the 2 peice DL in, I'm not sure what to do.
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-72 C-10 short step (straight line only) 12.922/102.28 -69 C-20 on Propane (DD) -69 C-10 -56 Mack B-753LS (tow rig) -94 Chev K2500 Short Ex-Cab -89 Isuzu Trooper...Kinda -03 Kawasaki KFX-400 -05 Suzuki DRZ-400S |
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#3 |
Project92 SWB stepside
Join Date: Feb 2003
Location: Louisville KY
Posts: 4,793
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I have talked to several shops on this and they say set it between 4-6 degrees. If you set the rear at 6 positive make sure your tranny sits at 6 negative. This can also be set the other way around. They say to never set them both at the same neg or positive. One must be a positive degree and the other a negative. The reason being is that if the are both positive or neg they will not have enough preload on the u joint and therfore will break easily under minumum torque loads.
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92 C1500 stepside 496 Stroker Competiton Engineering Ladder bars/QA1 coilovers. Dana 60 rear with 4.10 gear and posi. Bonspeed Palisade 20x12 in rear w/335/30/20 and 20x8.5 front w/245/40/20. 5/8 drop with Belltech springs/DJM spindles/drop shocks. WWS Progress thread http://67-72chevytrucks.com/vboard/s...d.php?t=140448 |
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#4 |
Registered User
Join Date: Feb 2002
Location: Gilmer, Texas USA
Posts: 313
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Wow I am confused now!! is positive up and negative down?
I am having a aluminum one piece drive shaft built as soon as I can get the rear end welded in and can get the right measurement on the shaft with the new tranny , engine and rear end. I need to be sure so that there will be no problems after everything is welded up.
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69 Chevy short fleet side soon to have LT1 and 4L60E pb. ps cruise and air. 68 Chevy short fleet side 400 sb 5 inch chop top pb. ps. pw. 350 auto and shaved handles 68 anniversary no engine long wheel base 400 auto FOR SALE 68 Chevy fleet side long wheel base complete parts truck. |
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#5 |
Project92 SWB stepside
Join Date: Feb 2003
Location: Louisville KY
Posts: 4,793
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Zero degrees is level. Up would be positive and yes down would be negative. It really does not matter which is negative or positive. Measure your tranny as it sits and see what the degree is. Say it is 4 degree positive. You would want to make the rear end the opposite at 4 degree negative.
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92 C1500 stepside 496 Stroker Competiton Engineering Ladder bars/QA1 coilovers. Dana 60 rear with 4.10 gear and posi. Bonspeed Palisade 20x12 in rear w/335/30/20 and 20x8.5 front w/245/40/20. 5/8 drop with Belltech springs/DJM spindles/drop shocks. WWS Progress thread http://67-72chevytrucks.com/vboard/s...d.php?t=140448 |
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#6 |
Registered User
Join Date: Nov 2002
Posts: 462
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#7 |
Registered User
Join Date: Feb 2002
Location: Gilmer, Texas USA
Posts: 313
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Wow, That is dangerous in my hands Custom Chevy!!!!!
I think I can get it right now, thanks a million. If I can get the welder and a case of beer I will be set , thanks again.
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69 Chevy short fleet side soon to have LT1 and 4L60E pb. ps cruise and air. 68 Chevy short fleet side 400 sb 5 inch chop top pb. ps. pw. 350 auto and shaved handles 68 anniversary no engine long wheel base 400 auto FOR SALE 68 Chevy fleet side long wheel base complete parts truck. |
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#8 |
Registered User
Join Date: Nov 2002
Posts: 462
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good luck!!
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#9 |
Registered User
Join Date: Oct 2002
Location: Des Moines WA. (Kent, area)
Posts: 668
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chevyman,
Im dooing the same swap do you have any pics? Does it look like the rear of your driveline will sit to the pass about 1"from being straight in line? How did you measure for your mounts?
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70 chev c10 swb fleet 72 grill, sb 400, 2/4 drop. 68 chev c10 swb fleet Early classic 4/6 drop with 4wheel disc brakes 9"rear 67-8 buckets tilt and A/C Classic GM Truck Club of Washington . |
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#10 |
Registered User
Join Date: Feb 2002
Location: Gilmer, Texas USA
Posts: 313
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Hey I have just ran up against that brick wall and stoped to make sure what to do.
I have been told that the off set will not be adverse to anything but I want to check it out before I weld any thing up. To line it up I simply cut old saddle mount from the original rear end (may it rest in peace ![]()
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69 Chevy short fleet side soon to have LT1 and 4L60E pb. ps cruise and air. 68 Chevy short fleet side 400 sb 5 inch chop top pb. ps. pw. 350 auto and shaved handles 68 anniversary no engine long wheel base 400 auto FOR SALE 68 Chevy fleet side long wheel base complete parts truck. |
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#11 |
Registered User
Join Date: Feb 2002
Location: Gilmer, Texas USA
Posts: 313
|
ttt
__________________
69 Chevy short fleet side soon to have LT1 and 4L60E pb. ps cruise and air. 68 Chevy short fleet side 400 sb 5 inch chop top pb. ps. pw. 350 auto and shaved handles 68 anniversary no engine long wheel base 400 auto FOR SALE 68 Chevy fleet side long wheel base complete parts truck. |
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#12 |
Registered User
Join Date: Oct 2002
Location: Des Moines WA. (Kent, area)
Posts: 668
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Got the rear done, I set the pinnion angle at 4 deg. I'll try to get a camera an post some pics.
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70 chev c10 swb fleet 72 grill, sb 400, 2/4 drop. 68 chev c10 swb fleet Early classic 4/6 drop with 4wheel disc brakes 9"rear 67-8 buckets tilt and A/C Classic GM Truck Club of Washington . |
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