Welding on rear axle purches. Any advice?? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

J.Cagle · 11-19-2011, 01:52 PM

Swapping a newer rearend in my 64 this weekend. I have new purches, ubolts, tracbar, and brackets. How is the best way to set pinion angle? Is there anything specific I do, or just tip it slightly up towards the transmission and call it good? Thanks, Jared

mbgmike · 11-19-2011, 02:15 PM

Quote:

Originally Posted by J.Cagle

Swapping a newer rearend in my 64 this weekend. I have new purches, ubolts, tracbar, and brackets. How is the best way to set pinion angle? Is there anything specific I do, or just tip it slightly up towards the transmission and call it good? Thanks, Jared

I do it on the truck. just bolt it together. set your angle , usually a good starting point is to line up with engine angle then tack weld the perches on. remove and final weld. but really depends on tire size and ride height if you are modifing the chassis

J.Cagle · 11-19-2011, 02:29 PM

truck has all factory suspension. The rear tires will be pretty close to stock height as well.

Rooster's 67 · 11-19-2011, 02:30 PM

Your pinion angle needs to match the angle of your tail shaft/output shaft within 1° of each other. Needs to be matched/set at ride height with any load you carry. A search of the board will find more than enough info on pinion angles and drive line design.

Also prep work is key to good welds, but If you are attempting this I assume your welding skill already tell you to grind all rust from all weld areas.

Rooster's 67 · 11-19-2011, 02:34 PM

Quickest and simplest to find http://www.hotrodhigh.ca/PinionAngle.html

Also note If i recall you dont want to exceed 4°-5° total angle in any joint it can cause vibrations

Rich 5150 69 · 11-19-2011, 02:38 PM

Idealy you would want the pinion 3 degrees down from the angle of the trans, reason being as your under load from normal driving the pinion will torque upward.

Rooster's 67 · 11-19-2011, 02:46 PM

More info than ya most likely want to know on Drive line angles and drive lines http://www2.dana.com/pdf/J3311-1-HVTSS.PDF

Rooster's 67 · 11-19-2011, 02:51 PM

Rich that would be in a leaf spring truck, in a trailing arm setup, setting them to an angle within 1° due to the fact that they don't "Twist on the spring" would be correct. Even on a leaf truck personally, I would only set the pinion 1° to 1.5° nose down due to the fact that once you reach cruising speed the spring will unload most of the twist imparted during acceleration. but then again if you get a vibration that is drive shaft related.. gonna take some fine tuning

Rich 5150 69 · 11-19-2011, 02:57 PM

True...

Rooster's 67 · 11-19-2011, 03:18 PM

J.Cagle,
might be more info than ya wanted, hope it all helps.

LostMy65 · 11-19-2011, 04:26 PM

I just used my original axle for reference.
See my build thread.
Posted via Mobile Device

crakarjax · 09-17-2014, 09:42 AM

Quote:

Originally Posted by Rooster's 67

More info than ya most likely want to know on Drive line angles and drive lines http://www2.dana.com/pdf/J3311-1-HVTSS.PDF

Thank you, this is a really valuable resource!

11-19-2011, 01:52 PM	#1
J.Cagle Registered User Join Date: Jun 2011 Location: Dennis Kansas Posts: 335	Welding on rear axle purches. Any advice?? Swapping a newer rearend in my 64 this weekend. I have new purches, ubolts, tracbar, and brackets. How is the best way to set pinion angle? Is there anything specific I do, or just tip it slightly up towards the transmission and call it good? Thanks, Jared __________________ 1964 c-10 Long stepside, 230 I6 ,3spd, dealer add-on air.

11-19-2011, 02:29 PM	#3
J.Cagle Registered User Join Date: Jun 2011 Location: Dennis Kansas Posts: 335	Re: Welding on rear axle purches. Any advice?? truck has all factory suspension. The rear tires will be pretty close to stock height as well. __________________ 1964 c-10 Long stepside, 230 I6 ,3spd, dealer add-on air.

11-19-2011, 02:30 PM	#4
Rooster's 67 Registered User Join Date: Sep 2003 Location: DFW Posts: 765	Re: Welding on rear axle purches. Any advice?? Your pinion angle needs to match the angle of your tail shaft/output shaft within 1° of each other. Needs to be matched/set at ride height with any load you carry. A search of the board will find more than enough info on pinion angles and drive line design. Also prep work is key to good welds, but If you are attempting this I assume your welding skill already tell you to grind all rust from all weld areas. __________________ The problem with America is stupidity. I'm not saying there should be a capital punishment for stupidity, but why don't we just take the safety labels off of everything and let the problem solve itself?

11-19-2011, 02:34 PM	#5
Rooster's 67 Registered User Join Date: Sep 2003 Location: DFW Posts: 765	Re: Welding on rear axle purches. Any advice?? Quickest and simplest to find http://www.hotrodhigh.ca/PinionAngle.html Also note If i recall you dont want to exceed 4°-5° total angle in any joint it can cause vibrations __________________ The problem with America is stupidity. I'm not saying there should be a capital punishment for stupidity, but why don't we just take the safety labels off of everything and let the problem solve itself?

11-19-2011, 02:38 PM	#6
Rich 5150 69 Registered User Join Date: Nov 2009 Location: Galt, Calif Posts: 2,437	Re: Welding on rear axle purches. Any advice?? Idealy you would want the pinion 3 degrees down from the angle of the trans, reason being as your under load from normal driving the pinion will torque upward. __________________ `64 C10 vortec 350/350/373 posi `69 RS/SS 350/350/308 `37 Ford 406/350/324 traclock `68 Dart 370/904/323 suregrip

11-19-2011, 02:46 PM	#7
Rooster's 67 Registered User Join Date: Sep 2003 Location: DFW Posts: 765	Re: Welding on rear axle purches. Any advice?? More info than ya most likely want to know on Drive line angles and drive lines http://www2.dana.com/pdf/J3311-1-HVTSS.PDF __________________ The problem with America is stupidity. I'm not saying there should be a capital punishment for stupidity, but why don't we just take the safety labels off of everything and let the problem solve itself?

11-19-2011, 02:51 PM	#8
Rooster's 67 Registered User Join Date: Sep 2003 Location: DFW Posts: 765	Re: Welding on rear axle purches. Any advice?? Rich that would be in a leaf spring truck, in a trailing arm setup, setting them to an angle within 1° due to the fact that they don't "Twist on the spring" would be correct. Even on a leaf truck personally, I would only set the pinion 1° to 1.5° nose down due to the fact that once you reach cruising speed the spring will unload most of the twist imparted during acceleration. but then again if you get a vibration that is drive shaft related.. gonna take some fine tuning __________________ The problem with America is stupidity. I'm not saying there should be a capital punishment for stupidity, but why don't we just take the safety labels off of everything and let the problem solve itself?

11-19-2011, 02:57 PM	#9
Rich 5150 69 Registered User Join Date: Nov 2009 Location: Galt, Calif Posts: 2,437	Re: Welding on rear axle purches. Any advice?? True... __________________ `64 C10 vortec 350/350/373 posi `69 RS/SS 350/350/308 `37 Ford 406/350/324 traclock `68 Dart 370/904/323 suregrip

11-19-2011, 03:18 PM	#10
Rooster's 67 Registered User Join Date: Sep 2003 Location: DFW Posts: 765	Re: Welding on rear axle purches. Any advice?? J.Cagle, might be more info than ya wanted, hope it all helps. __________________ The problem with America is stupidity. I'm not saying there should be a capital punishment for stupidity, but why don't we just take the safety labels off of everything and let the problem solve itself?

11-19-2011, 04:26 PM	#11
LostMy65 But Found Her 25yrs Later! Join Date: Oct 2010 Location: Oregon City, Oregon Posts: 10,530	Re: Welding on rear axle purches. Any advice?? I just used my original axle for reference. See my build thread. Posted via Mobile Device __________________ I lost my 65 - Found it 25 years later: http://67-72chevytrucks.com/vboard/s...d.php?t=426650 66 C20 Service Truck: http://67-72chevytrucks.com/vboard/s...d.php?t=428035



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