2 piece driveshaft timing question - The 1947 - Present Chevrolet & GMC Truck Message Board Network

*rage'nrat638* · 07-21-2006, 08:35 PM

how do you know for sure your drive shaft is timed correct..
please post a picture of describe what to look for
thanks mark

**truckdude239** · 07-21-2006, 09:55 PM

you can time a driveshaft? i've heard of balanceing a driveshaft but not timing

Karl Hoh · 07-21-2006, 11:40 PM

If you didn't index mark the shafts when they were disassembled, they will need to be balanced as well, if the yokes have not been removed, ie; for u-joint replacement, you're OK. Sorry rage'nrat, I don't have pixs, but will explain. When joining the shafts, the ears,( u-joint cups) on the slip yoke must be in line with the ears on the front end of the driveshaft. (not the front yoke). It should look like this: front yoke vertical, front of 1st shaft horizontal, hanger bearing, slip yoke horizontal, front of 2nd shaft vertical, rear of 2nd shaft vertical. When the shafts are built, they are balanced separately, so they just need to be assembled correctly. Hope this make sense and helps.
Karl

badpeanut · 07-21-2006, 11:43 PM

I always thought the U-joints on the front half and back half should be exactly 90° from one another, but I remember the factory service manual describing an installation procedure based on counting the splines between the two shafts that is slightly different than 90°. My manual isn't accessable right now, but I can check later if needed.

TugOwar · 07-22-2006, 10:02 AM

This would be good for the FAQ if someone can add a pic or two.

*rage'nrat638* · 07-22-2006, 03:06 PM

just got in from phasing (timing) my drive shafts...sure enough they were incorrect...
took it for a test drive..smooth....
cleaned the living well you know out of the drive shaft..
any under coating will throw the balance off...
painted with a very light coat of paint...
tried to take pictures under the truck.., but they were not good enough to show any thing..except a clean drive shaft..
here's some book pictures

chevymad · 07-22-2006, 06:53 PM

Sweet! Maybe this is my recurring vibration i've never been able to get rid of. Looks like i'm off 90* First driveline I had was off 45* lol. Tried lining it up, but dont think I did it right. I then replaced it with a driveline I got from my brother. Just put it together like it was when I got it. But its off too.

Hey, one more related question. I remember back before I got this truck there used to be shims between the carrier bearing and the frame mount. By the time I got the truck those shims were gone. Any idea what the heigth of the carrier bearing is supposed to be?

*rage'nrat638* · 07-22-2006, 07:50 PM

on the tail of the first shaft sticking out of the center support bearing on the end there was a L stamped on the end..

on the slip yoke there was a arrow stamped on it..when mated they lined up just like the book said to do it..

MAN WHAT A DIFFERENCE to think i been driving the truck like this for 2 years, i just got a bug up my butt, and decided to check it out.
sure enough...
like i said i tryed to take pictures under the truck but they just would not turn out..here's what i got.

this is the arrow on the slip yoke only found that after a lot of cleaning

my front & rear yoke's did have spicer 3-3-69 stamped on them..guess it's the correct drive shaft

chevymad · 07-23-2006, 09:57 PM

Took mine apart and checked it today. The driveline i'm using has 2 splines bent together so that they can only slip together one way. It doesnt match the book pics either. Oh well, someday i'll find that vibration.

grayw0lf · 07-24-2006, 10:54 AM

Is this also true for 1 piece driveshafts, like on my '89 S-10?

This could explain my horrible vibrations.

*rage'nrat638* · 07-25-2006, 11:18 PM

move to FAQ if needed...mark

07-21-2006, 08:35 PM	#1
rage'nrat638 Account Suspended Join Date: Mar 2003 Location: THE FALL GUY CHICAGO IL Posts: 5,883	2 piece driveshaft timing question how do you know for sure your drive shaft is timed correct.. please post a picture of describe what to look for thanks mark

07-21-2006, 09:55 PM	#2
truckdude239 Senior Member Join Date: Sep 2005 Location: Lewisville, Nc Posts: 10,233	Re: 2 piece driveshaft timing question you can time a driveshaft? i've heard of balanceing a driveshaft but not timing __________________ David fuller Ase Certified Mechanic Click here to help support our board!! 1971 Chevy c-10 under going a 4.8l LSx swap Build Thread http://67-72chevytrucks.com/vboard/s...d.php?t=421305 2007 Honda Accord my daily 145kmiles 2002 Honda Accord 4 door With 330k(sisters car) 2005 toyota Avalon 228k( brothers car) 2002 Sububran 5.3 245k 2000 Tahoe 5.3l 378 General manager for Marco's Carwash & lube Last edited by truckdude239; 07-21-2006 at 09:55 PM.

07-21-2006, 11:40 PM	#3
Karl Hoh A little east of nowhere Join Date: Feb 2006 Location: LaBroquerie,Manitoba Canada Posts: 168	Re: 2 piece driveshaft timing question If you didn't index mark the shafts when they were disassembled, they will need to be balanced as well, if the yokes have not been removed, ie; for u-joint replacement, you're OK. Sorry rage'nrat, I don't have pixs, but will explain. When joining the shafts, the ears,( u-joint cups) on the slip yoke must be in line with the ears on the front end of the driveshaft. (not the front yoke). It should look like this: front yoke vertical, front of 1st shaft horizontal, hanger bearing, slip yoke horizontal, front of 2nd shaft vertical, rear of 2nd shaft vertical. When the shafts are built, they are balanced separately, so they just need to be assembled correctly. Hope this make sense and helps. Karl __________________ 68 C10 250 4spd 69 C20 327 4spd 69 910 250 3spd 80 K10 350 4spd 76 C60 366 5spd school bus "THERE'S NOTHING YOU CAN BREAK THAT SOMEONE CAN'T BE PAID TO REPAIR" Last edited by Karl Hoh; 07-21-2006 at 11:46 PM.

07-21-2006, 11:43 PM	#4
badpeanut Not a bad nut after all.. Join Date: Dec 2000 Location: ND Posts: 1,756	Re: 2 piece driveshaft timing question I always thought the U-joints on the front half and back half should be exactly 90° from one another, but I remember the factory service manual describing an installation procedure based on counting the splines between the two shafts that is slightly different than 90°. My manual isn't accessable right now, but I can check later if needed. __________________ '05 Chevy 2500HD 4x4 '72 GMC LWB 4x2 driver '72 Chevy LWB 4x4 plow truck '71 Blazer 4x4 driver '70 GMC LWB trailer

07-22-2006, 10:02 AM	#5
TugOwar Registered User Join Date: Sep 2004 Location: Pleasanton, TX Posts: 1,723	Re: 2 piece driveshaft timing question This would be good for the FAQ if someone can add a pic or two.

07-22-2006, 03:06 PM	#6
rage'nrat638 Account Suspended Join Date: Mar 2003 Location: THE FALL GUY CHICAGO IL Posts: 5,883	Re: 2 piece driveshaft timing question just got in from phasing (timing) my drive shafts...sure enough they were incorrect... took it for a test drive..smooth.... cleaned the living well you know out of the drive shaft.. any under coating will throw the balance off... painted with a very light coat of paint... tried to take pictures under the truck.., but they were not good enough to show any thing..except a clean drive shaft.. here's some book pictures Last edited by rage'nrat638; 07-12-2007 at 07:02 AM.

07-22-2006, 06:53 PM	#7
chevymad Registered User Join Date: Jan 2001 Location: skamokawa, WA, USA Posts: 527	Re: 2 piece driveshaft timing question Sweet! Maybe this is my recurring vibration i've never been able to get rid of. Looks like i'm off 90* First driveline I had was off 45* lol. Tried lining it up, but dont think I did it right. I then replaced it with a driveline I got from my brother. Just put it together like it was when I got it. But its off too. Hey, one more related question. I remember back before I got this truck there used to be shims between the carrier bearing and the frame mount. By the time I got the truck those shims were gone. Any idea what the heigth of the carrier bearing is supposed to be? __________________ 70 C10 long fleet, 355/200 4r, 6 lug disc conversion, 3" drop 70 gmc changed to 67/8 chevy, 454 with voodoo cam, th400, all 74 running gear.. in progress Last edited by chevymad; 07-22-2006 at 06:56 PM.

07-22-2006, 07:50 PM	#8
rage'nrat638 Account Suspended Join Date: Mar 2003 Location: THE FALL GUY CHICAGO IL Posts: 5,883	Re: 2 piece drive shaft timing question on the tail of the first shaft sticking out of the center support bearing on the end there was a L stamped on the end.. on the slip yoke there was a arrow stamped on it..when mated they lined up just like the book said to do it.. MAN WHAT A DIFFERENCE to think i been driving the truck like this for 2 years, i just got a bug up my butt, and decided to check it out. sure enough... like i said i tryed to take pictures under the truck but they just would not turn out..here's what i got. this is the arrow on the slip yoke only found that after a lot of cleaning my front & rear yoke's did have spicer 3-3-69 stamped on them..guess it's the correct drive shaft Last edited by rage'nrat638; 07-12-2007 at 07:02 AM.

07-23-2006, 09:57 PM	#9
chevymad Registered User Join Date: Jan 2001 Location: skamokawa, WA, USA Posts: 527	Re: 2 piece driveshaft timing question Took mine apart and checked it today. The driveline i'm using has 2 splines bent together so that they can only slip together one way. It doesnt match the book pics either. Oh well, someday i'll find that vibration. __________________ 70 C10 long fleet, 355/200 4r, 6 lug disc conversion, 3" drop 70 gmc changed to 67/8 chevy, 454 with voodoo cam, th400, all 74 running gear.. in progress

07-24-2006, 10:54 AM	#10
grayw0lf Registered User Join Date: Apr 2004 Location: Clanton, AL Posts: 1,253	Re: 2 piece driveshaft timing question Is this also true for 1 piece driveshafts, like on my '89 S-10? This could explain my horrible vibrations. __________________ 85' CUCV M1009!!! The newest addition! 6.2diesel, Th400, NP208, & only 36k miles! 70' C-10 LWB Fleetside - Looking good these days! 05' Dodge Neon 88' Winner Escape Sport 1750 - 4.3v6 94' Seadoo SP 84' Honda TRX200, bare nekkid. Just a frame & tires. Always looking for another project or any good deal!

07-25-2006, 11:18 PM	#11
rage'nrat638 Account Suspended Join Date: Mar 2003 Location: THE FALL GUY CHICAGO IL Posts: 5,883	Re: 2 piece driveshaft timing question move to FAQ if needed...mark



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