Driveline angle question. - Page 2 - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**Ironangel** · 01-14-2020, 03:11 AM

The front shaft should be inline or close to inline with the transmission. All three yokes should be phased inline with one another. If the slip joint was disassembled and reassembled one or more splines out of phase a vibration can occur. Lowering the truck decreases the angles reducing the u-joint stress. I'd suspect an imbalanced shaft and/or a yoke phasing problem.

Daaaanz67 · 01-16-2020, 02:14 PM

Quote:

Originally Posted by mongocanfly

The angles dont care which way they are...its all about the angles canceling each other out...but with drop things change...got any pics of your setup?

Sorry for late response. I have no pics but will report back when I get the measurements thanks again.

Daaaanz67 · 01-16-2020, 02:18 PM

Quote:

Originally Posted by Ironangel

The front shaft should be inline or close to inline with the transmission. All three yokes should be phased inline with one another. If the slip joint was disassembled and reassembled one or more splines out of phase a vibration can occur. Lowering the truck decreases the angles reducing the u-joint stress. I'd suspect an imbalanced shaft and/or a yoke phasing problem.

So then your saying that the front shat is not a big concern and that the rear shaft joint angleS should cancel ?

**mongocanfly** · 01-16-2020, 02:54 PM

You need a little angle in the ujoint to make the needles rotate in the cup to lubricate them...0 deg is not ideal..
Copied this...
U-Joint Angles - U-joints need a slight angle for proper lubrication. Without the correct angles, the needle bearings in the u-joint caps do not rotate. Those needle bearings need to rotate in order for the u-joint to operate reliably and smoothly. These u-joint angles should always be at least 1-degree to avoid wearing out the yoke bearings. U-joints fail at 30* degrees.

Lugnutz65 · 02-02-2020, 10:07 PM

A very generous forum member gave me a factory AT crossmember. I used it to support the 700R4 after I cut down the rubber tail shaft support mount.
For all that helped me through this effort, you deserve a few pics.
All angles have horizontal as the reference.
We have not driven the truck yet, but I’m pretty happy with how things measured once it was bolted down.

**mongocanfly** · 02-02-2020, 11:27 PM

on the pic with the differential in it ...did you mean to show angle down on the diff?...or is it up angle?
is this like your pics?

88Stanger · 07-14-2020, 10:52 AM

Thanks for this info. I am building a "66 from ground up with summits frame support and tranny mount, and just need to get the angle all correct.

01-14-2020, 03:11 AM	#26
Ironangel Senior Member Join Date: Feb 2010 Location: Falls City, Nebraska "100 Miles From Nowhere" Posts: 2,219	Re: Driveline angle question. The front shaft should be inline or close to inline with the transmission. All three yokes should be phased inline with one another. If the slip joint was disassembled and reassembled one or more splines out of phase a vibration can occur. Lowering the truck decreases the angles reducing the u-joint stress. I'd suspect an imbalanced shaft and/or a yoke phasing problem. Attached Images __________________ Michael of the clan Hill, "Two Seventy Two's" 71 1-ton Dually 350 4-Speed 71 C/50 Grain Truck, 350 Split-Axle 4-Speed 02 3/4 ton Express 14 Indian Chief Vintage 1952 Ford 8N, "Only Ford Allowed On The Property" "Be American, Buy American"

01-16-2020, 02:54 PM	#29
mongocanfly Post Whore Join Date: May 2015 Location: Alabama Posts: 14,583	Re: Driveline angle question. You need a little angle in the ujoint to make the needles rotate in the cup to lubricate them...0 deg is not ideal.. Copied this... U-Joint Angles - U-joints need a slight angle for proper lubrication. Without the correct angles, the needle bearings in the u-joint caps do not rotate. Those needle bearings need to rotate in order for the u-joint to operate reliably and smoothly. These u-joint angles should always be at least 1-degree to avoid wearing out the yoke bearings. U-joints fail at 30* degrees. __________________ Mongo...aka Greg RIP Dad RIP Jesse 1981 C30 LQ9 NV4500..http://67-72chevytrucks.com/vboard/s...d.php?t=753598 Mongos AD- LS3 TR6060...http://67-72chevytrucks.com/vboard/s...34#post8522334 Columbus..the 1957 IH 4x4...http://67-72chevytrucks.com/vboard/s...63#post8082563 2023 Chevy Z71..daily driver Last edited by mongocanfly; 01-16-2020 at 03:01 PM.

02-02-2020, 10:07 PM	#30
Lugnutz65 Registered User Join Date: Jan 2013 Location: Columbia, SC Posts: 1,926	Re: Driveline angle question. A very generous forum member gave me a factory AT crossmember. I used it to support the 700R4 after I cut down the rubber tail shaft support mount. For all that helped me through this effort, you deserve a few pics. All angles have horizontal as the reference. We have not driven the truck yet, but I’m pretty happy with how things measured once it was bolted down. Attached Images __________________ My 65 C10 build: www.lugnutz65chevystepside.weebly.com Want to know more about T5 transmissions? My website has a T5 Info Page and a Step by Step T5 rebuild.

02-02-2020, 11:27 PM	#31
mongocanfly Post Whore Join Date: May 2015 Location: Alabama Posts: 14,583	Re: Driveline angle question. on the pic with the differential in it ...did you mean to show angle down on the diff?...or is it up angle? is this like your pics? Attached Images __________________ Mongo...aka Greg RIP Dad RIP Jesse 1981 C30 LQ9 NV4500..http://67-72chevytrucks.com/vboard/s...d.php?t=753598 Mongos AD- LS3 TR6060...http://67-72chevytrucks.com/vboard/s...34#post8522334 Columbus..the 1957 IH 4x4...http://67-72chevytrucks.com/vboard/s...63#post8082563 2023 Chevy Z71..daily driver Last edited by mongocanfly; 02-02-2020 at 11:37 PM.

07-14-2020, 10:52 AM	#32
88Stanger Registered User Join Date: Mar 2015 Location: Washington State Posts: 1,644	Re: Driveline angle question. Thanks for this info. I am building a "66 from ground up with summits frame support and tranny mount, and just need to get the angle all correct.



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