The 1947 - Present Chevrolet & GMC Truck Message Board Network







Register or Log In To remove these advertisements.

Go Back   The 1947 - Present Chevrolet & GMC Truck Message Board Network > 47 - Current classic GM Trucks > The 1967 - 1972 Chevrolet & GMC Pickups Message Board

Web 67-72chevytrucks.com


Reply
 
Thread Tools Display Modes
Old 04-14-2010, 11:05 PM   #1
owa1000
Registered User
 
Join Date: Mar 2010
Location: Edinburg,tx
Posts: 18
driveshaft problems.....please help

So i picked up a 67 gmc swb and now im trying to get it on the road i have run into some problems. Im trying to hook the drive shaft up but cant seem to find the right u joint. The u joint that came on the drive shaft seems to be to small for the pinion yoke on the rear end. I dont know if this helps but I have a 400 trans and it seems to be a 8.5 10bolt. I have tried several u joints and either they are to big or to small. Does anyone know what i could do to get these things to line up. Im new at this and any help would be appreciated. thanks everyone

here is a quick pic

Last edited by owa1000; 04-14-2010 at 11:07 PM.
owa1000 is offline   Reply With Quote
Old 04-15-2010, 01:14 AM   #2
mdwilf
Registered User
 
mdwilf's Avatar
 
Join Date: Feb 2009
Location: Jefferson City, MO
Posts: 83
Re: driveshaft problems.....please help

This is a pretty common problem. Take all the ujoints that came out of it with you to a parts store (you'll have to find one where they know more than what the computer tells them - probably one with a bunch of old guys working there) and tell them your problem. Some companies make "crossover" joints with different size cups on them or you may have to buy two joints to make one.
__________________
What I do in my spare time:
http://rosebudsgarage.shutterfly.com
mdwilf is offline   Reply With Quote
Old 04-15-2010, 05:40 AM   #3
eightbanger
454 MAKES IT ROAR
 
eightbanger's Avatar
 
Join Date: Jan 2008
Location: Essex, U.K
Posts: 2,701
Re: driveshaft problems.....please help

As stated above you may need a "crossover" UJ this is exactly what I needed but at the time couldn't understand why nothing would fit, this is when the UJ has to different lengths in one, this is needed when your DS UJ is smaller than your PY UJ.
Here's some pics I took at the time.

The UJ on the left was the wrong replacement I bought, and the one on the right is my old one the pic shows how the new UJ was the correct lenght one way but shorter in the opposite side.


__________________
Nigel.

An American living in a British body.

1971 Chevy Cheyenne 10 454

"In a time of universal deceit, telling the truth becomes a revolutionary act." - George Orwell


"When injustice becomes law, resistance becomes duty" - Thomas Jefferson

No more pain.
03.12.60 -- 12.28.10

http://www.youtube.com/Eightbanger

Last edited by eightbanger; 04-15-2010 at 05:46 AM.
eightbanger is offline   Reply With Quote
Old 04-15-2010, 07:43 AM   #4
dznucks
Registered User
 
dznucks's Avatar
 
Join Date: Feb 2006
Location: Smyrna, Ga
Posts: 1,647
Re: driveshaft problems.....please help

In what way is it too big or too small? and by how much is it off?

I ran into a similar problem awhile ago. I originally thought i needed a crossover ujoint too. If its not a u-joint issue then it may be a worn out yoke. The tangs on my yoke were .050" bigger than the overall length of the u joint. I didnt think the yoke could be worn out that bad. I was told this was caused from the ujoint/yoke bolts and strap coming loose, allowing the yoke to move around a bit. if you can, try and get the u-bolts instead of the two bolts and strap.
dznucks is offline   Reply With Quote
Old 04-15-2010, 08:27 AM   #5
Shyguy
Junior Member
 
Shyguy's Avatar
 
Join Date: Dec 2006
Location: Southeast Missouri
Posts: 2,436
Re: driveshaft problems.....please help

I had the same problem when we put a 3/4 ton drive shaft in a truck we built that had a rear end for a 1/2 ton.

I took measurements and the old joints to a place here, Fishers Auto Parts and talked to an old guy there. He took measurements and looked in his old catalog and came up with what he called a "Jump Joint' that worked great.

Fisher is also called Federated Auto Parts.

Danny
__________________
'67 Chevy C-20 short stepper - build complete, 454/SM-465.
'75 C-30 Single Cab DRW-350 small block/NP-435.
'77 GMC-6500 Dump Truck, 427 Tall Deck.
'92 GMC K-3500 Duallie, 454/4L80E.
Shyguy is offline   Reply With Quote
Old 04-16-2010, 03:21 AM   #6
brad_man_72
the boat guy
 
brad_man_72's Avatar
 
Join Date: Jul 2007
Location: springfield mo
Posts: 2,339
Re: driveshaft problems.....please help

measurements are great. And also what type of joint is good to know inside or outside keepers. Cup diameter and lenth\width. There isn't an accurate book on what vehiccle takes what ujoints, and after 40 years all bets are off anyways.
__________________
67, swb, fleet, tach, throttle, 5.3, 4l60e, 3.73's, fuel cell, 5 lug, p.d.b., 4-6 drop. great little truck
66, stevens drag/ski 18' silouette, 350, 2.02 doublehump heads. comp extreme marine 278 cam, vette 7 fin valve covers, old polished edelbrock intake, velvetdrive, casale v-drive, adj cavitation plate.
28, model a rpu project,
brad_man_72 is offline   Reply With Quote
Old 04-16-2010, 04:04 PM   #7
eightbanger
454 MAKES IT ROAR
 
eightbanger's Avatar
 
Join Date: Jan 2008
Location: Essex, U.K
Posts: 2,701
Re: driveshaft problems.....please help

This is were I went for my UJ's and Pinion Yoke, they also have diagrams that you download print off and use to work out the exact size UJ for your application.

http://www.dennysdriveshaft.com/how_to_measure.html
__________________
Nigel.

An American living in a British body.

1971 Chevy Cheyenne 10 454

"In a time of universal deceit, telling the truth becomes a revolutionary act." - George Orwell


"When injustice becomes law, resistance becomes duty" - Thomas Jefferson

No more pain.
03.12.60 -- 12.28.10

http://www.youtube.com/Eightbanger

Last edited by eightbanger; 04-16-2010 at 04:04 PM.
eightbanger is offline   Reply With Quote
Reply

Bookmarks


Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -4. The time now is 08:14 PM.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
Copyright 1997-2022 67-72chevytrucks.com