Pinion angle variance on a '66 - The 1947 - Present Chevrolet & GMC Truck Message Board Network

AcampoDave · 07-26-2020, 05:57 PM

My tranny is at 5 degrees down and my diff is 4 degrees up. The smallest shim available seems to be 2 degrees. Do I even have a problem? Reason I even ask is that the U joint in my tranny yoke has worn into a "glitchy" tight spot after only about a thousand miles. The glitch is where it normally rides in the yoke while driving and is only on the caps in the yoke side. The tube side caps are smooth as new.

**Captainfab** · 07-26-2020, 10:06 PM

The 1 degree difference should not be an issue. I do not know why you are having an issue with your u-joint . Is the u-joint greaseable?

AcampoDave · 07-27-2020, 12:18 AM

Thanks Captain, it is greasable and I did grease it prior to installation but since I recently had it rebuilt and shortened at a shop I was going to just run it back to them this week and see what they say. Sometimes greasing those things results in grease oozing profusely out the shoulders of one or two caps and it leading you to think it's good to go but perhaps the grease was just following the path of least resistance and the yoke caps were left needing more. In any case I'll follow up and let you know what they find.

**mongocanfly** · 07-27-2020, 03:06 PM

I'd also think it wouldnt be a issue..even though that's more angle than I'd want...the issue may be the ujoint itself...make sure it's a good quality...I've seen the cheap stuff wear out quickly..

**PGSigns** · 07-28-2020, 09:15 PM

Can you shim up the back of the trans? One more question, what is the drive shaft angle? The relationship between the three is whats important.
Jimmy

AcampoDave · 07-29-2020, 07:26 PM

I did try shimming the transmission but it was a bust. I still use the cast iron bell housing which sits in a v shaped (or sloped) mount and raising the housing even a little causes the bolt holes to miss the mark. That's the trouble with the v shape I suppose. If it were a tailshaft mount I'd be set. I will check the driveshaft angle and let you know when the shop gets it back to me. The driveline guy's first impression was that I twisted the U joint loops a bit on the yoke end of the tube. I believe that's quite possible since I have a Muncie with a 2.98 first gear and 3.08 rear gears with 27" tires....and well....how can you avoid slamming a Muncie through the gears

07-26-2020, 05:57 PM	#1
AcampoDave Registered User Join Date: Feb 2013 Location: central California Posts: 2,778	Pinion angle variance on a '66 My tranny is at 5 degrees down and my diff is 4 degrees up. The smallest shim available seems to be 2 degrees. Do I even have a problem? Reason I even ask is that the U joint in my tranny yoke has worn into a "glitchy" tight spot after only about a thousand miles. The glitch is where it normally rides in the yoke while driving and is only on the caps in the yoke side. The tube side caps are smooth as new. Last edited by AcampoDave; 07-26-2020 at 06:19 PM.

07-26-2020, 10:06 PM	#2
Captainfab 60-66 Nut Join Date: Mar 2007 Location: Coeur d'Alene, Idaho Posts: 23,252	Re: Pinion angle variance on a '66 The 1 degree difference should not be an issue. I do not know why you are having an issue with your u-joint . Is the u-joint greaseable? __________________ Power Steering Box Adapter Plates For Sale HERE Power Brake Booster Adapter Brackets For Sale '63-'66 HERE and '67-'72 HERE and '60-'62 HERE and "60-'62 with clutch HERE Rear Disc Brake Brackets For Sale. Impala SS calipers HERE Camaro Calipers HERE D52 Calipers HERE 6 Lug HERE Hydroboost Mounting Plates HERE

07-27-2020, 12:18 AM	#3
AcampoDave Registered User Join Date: Feb 2013 Location: central California Posts: 2,778	Re: Pinion angle variance on a '66 Thanks Captain, it is greasable and I did grease it prior to installation but since I recently had it rebuilt and shortened at a shop I was going to just run it back to them this week and see what they say. Sometimes greasing those things results in grease oozing profusely out the shoulders of one or two caps and it leading you to think it's good to go but perhaps the grease was just following the path of least resistance and the yoke caps were left needing more. In any case I'll follow up and let you know what they find.

07-27-2020, 03:06 PM	#4
mongocanfly Post Whore Join Date: May 2015 Location: Alabama Posts: 14,671	Re: Pinion angle variance on a '66 I'd also think it wouldnt be a issue..even though that's more angle than I'd want...the issue may be the ujoint itself...make sure it's a good quality...I've seen the cheap stuff wear out quickly.. __________________ 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

07-28-2020, 09:15 PM	#5
PGSigns Senior Member Join Date: Jan 2011 Location: Hayes Va Posts: 4,569	Re: Pinion angle variance on a '66 Can you shim up the back of the trans? One more question, what is the drive shaft angle? The relationship between the three is whats important. Jimmy __________________ 60 to 66 Chevy and GMC window decals http://67-72chevytrucks.com/vboard/s...d.php?t=661131 Good friends, good food and a hotrod what else do you need? 1966 BBW long fleet Daily driver 1965 BBW short fleet Sold and going to a good home 1965 Suburban 2003 3500 Duramax 2005 Ultra Classic

07-29-2020, 07:26 PM	#6
AcampoDave Registered User Join Date: Feb 2013 Location: central California Posts: 2,778	Re: Pinion angle variance on a '66 I did try shimming the transmission but it was a bust. I still use the cast iron bell housing which sits in a v shaped (or sloped) mount and raising the housing even a little causes the bolt holes to miss the mark. That's the trouble with the v shape I suppose. If it were a tailshaft mount I'd be set. I will check the driveshaft angle and let you know when the shop gets it back to me. The driveline guy's first impression was that I twisted the U joint loops a bit on the yoke end of the tube. I believe that's quite possible since I have a Muncie with a 2.98 first gear and 3.08 rear gears with 27" tires....and well....how can you avoid slamming a Muncie through the gears



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