Help! Front drive shaft keeps "falling" out. - The 1947 - Present Chevrolet & GMC Truck Message Board Network

johnnywagon · 07-08-2008, 01:55 PM

OK this is pissing me off. The bolts that bolt the CV yoke to the transfer case keep backing out. Ive tried red, blue and green lock tight. Last time out, I forgot to check the bolts, it looks like two backed all the way out then, of course the remaining two sheared off. I've been using u-joint strap bolts because they are the same fine thread and have the smaller bolt head. Am I missing something?

70LonghornCST · 07-08-2008, 02:00 PM

I had that problem before. I could not get the bolts to hold at all. I wound up cleaning the bolt holes and bolts with simple green and then soap and water. It held for me then. Apparently I got grease in there and it wouldn't hold.

hdflstf · 07-08-2008, 02:32 PM

Clean the bolt and the threads with brake parts cleaner. Make sure they are dry - no grease, no oil, clean... Then blue locktite the bolts and torque to spec.

**jaros44sr** · 07-08-2008, 08:14 PM

Above advice should work, but you could make some sheetmetal tabs, like used on exhaust manifolds

johnnywagon · 07-08-2008, 08:17 PM

It is a greasy mess down there. Simple enough to clean it. Thanks!!

vtblazer · 07-09-2008, 06:09 AM

What...no pics?

I like the metal tab idea myself, then you'd be sure.

**jerry moss** · 07-09-2008, 09:40 AM

you can also drill a hole through each bolt head and run a wire through the holes on each bolt then twist the ends of the wire together.

**jaros44sr** · 07-09-2008, 11:04 AM

Quote:

Originally Posted by hdflstf

Clean the bolt and the threads with brake parts cleaner. Make sure they are dry - no grease, no oil, clean... Then blue locktite the bolts and torque to spec.

Do you have to add 10 percent of the torque value when adding a solution of liquid?

BIG HEAD · 07-09-2008, 02:19 PM

Jonnyw. There Is A Number Of Things That Can Contribute To Your Problem. You Have Already Been Told A Couple Of Things. If Those Dont Work. Check To See If Your Yokes Are Binding Up When You Put Twist On Your Suspention. Looking At Some Of Your Pictures I Bet The U-joint And Yokes Are Binding Causing Stress On The Straps And Bolts. You May Be Able To Do A Little Grinding. Or The More Expensive Route , Bigger Joints. You Probaly Have A 1350 Joint. If So Go To A 1410. I Hope The Info Helps. Looks As Though You Have Fun With Your Ride, I Can Apreciate That, Bighead

dammitmitchell · 07-09-2008, 07:14 PM

i had that issue also i used a bore brush to a 380 pistol on a cleaning rod with my drill, then sijmmplegreen ord driveway cleaner ...

07-08-2008, 01:55 PM	#1
johnnywagon Sofa King. We, Todd, Ed. Join Date: Oct 2006 Location: Spokane, Wa. Posts: 631	Help! Front drive shaft keeps "falling" out. OK this is pissing me off. The bolts that bolt the CV yoke to the transfer case keep backing out. Ive tried red, blue and green lock tight. Last time out, I forgot to check the bolts, it looks like two backed all the way out then, of course the remaining two sheared off. I've been using u-joint strap bolts because they are the same fine thread and have the smaller bolt head. Am I missing something? __________________ ~John 71 Blazer One Ton 65 Chevelle Station Wagon x2 59 Belair 2 Door 71 Chevy Open Road Van RV www.myspace.com/johnnywagon Last edited by johnnywagon; 07-08-2008 at 01:57 PM.

07-08-2008, 02:00 PM	#2
70LonghornCST Moderator Join Date: Jun 2008 Location: Modesto, CA Posts: 5,775	Re: Help! Front drive shaft keeps "falling" out. I had that problem before. I could not get the bolts to hold at all. I wound up cleaning the bolt holes and bolts with simple green and then soap and water. It held for me then. Apparently I got grease in there and it wouldn't hold. __________________ 2018 Chevy Crew Cab 2006 Impala SS 1965 Plymouth Sport Fury 1970 Chevy Longhorn Bucket Seats Shoulder Belts Front Tow Hooks Factory Air Factory Speedwarning, Tach & Vaccum Factory Tilt CST Package AM/FM Radio Bumper Guards Richard 70 Longhorn CST Build Adding an AM/FM Decal

07-08-2008, 02:32 PM	#3
hdflstf Registered User Join Date: Oct 2007 Location: Desert Southwest Posts: 540	Re: Help! Front drive shaft keeps "falling" out. Clean the bolt and the threads with brake parts cleaner. Make sure they are dry - no grease, no oil, clean... Then blue locktite the bolts and torque to spec.

07-08-2008, 08:14 PM	#4
jaros44sr Senior Member Join Date: May 2006 Location: Philadelphia, Pa. 19454 Posts: 9,761	Re: Help! Front drive shaft keeps "falling" out. Above advice should work, but you could make some sheetmetal tabs, like used on exhaust manifolds __________________ Semper Fi...Uncle Sam, you da man All parts offered to help are free, unless otherwise noted Dont try this stuff in my build thread, unless you have 55 years of mechanical OTJ training SAFETY FIRST AS usual, off topic They say your mind goes second, can't remember the first Jim

07-08-2008, 08:17 PM	#5
johnnywagon Sofa King. We, Todd, Ed. Join Date: Oct 2006 Location: Spokane, Wa. Posts: 631	Re: Help! Front drive shaft keeps "falling" out. It is a greasy mess down there. Simple enough to clean it. Thanks!! __________________ ~John 71 Blazer One Ton 65 Chevelle Station Wagon x2 59 Belair 2 Door 71 Chevy Open Road Van RV www.myspace.com/johnnywagon

07-09-2008, 06:09 AM	#6
vtblazer Registered User Join Date: Oct 2003 Location: Central Vermont Posts: 8,537	Re: Help! Front drive shaft keeps "falling" out. What...no pics? I like the metal tab idea myself, then you'd be sure.

07-09-2008, 09:40 AM	#7
jerry moss Born Psycho Join Date: Feb 2001 Location: brentwood,cal,usa Posts: 4,936	Re: Help! Front drive shaft keeps "falling" out. you can also drill a hole through each bolt head and run a wire through the holes on each bolt then twist the ends of the wire together. __________________ jerry moss 72 cheyenne super K20- tilt,tach,vacuum,speedwarning,buckets,shoulder belts,am/fm,tow hooks,bumper guards,toolbox,aux. fuel tank,posi front and rear,plus other goodies!!! SOLD 69 suburban K20-tilt,tach,vacuum,speedwarning,buckets,shoulder belts,am/fm,4 inch all spring lift,4 speed, 14 bolt full floater, dana 44 HD,warn winch,posi front and rear,tow hooks,plus other goodies. 73/80 chevy/gmc K20 SB400,turbo 400,205,tilt,a-c,gas hog. 77 K/5 cheyenne blazer-daily driver/beater. SON HAS IT NOW BRENTWOOD,CALIFORNIA

07-09-2008, 02:19 PM	#9
BIG HEAD Registered User Join Date: Jan 2008 Location: lake city florida Posts: 327	Re: Help! Front drive shaft keeps "falling" out. Jonnyw. There Is A Number Of Things That Can Contribute To Your Problem. You Have Already Been Told A Couple Of Things. If Those Dont Work. Check To See If Your Yokes Are Binding Up When You Put Twist On Your Suspention. Looking At Some Of Your Pictures I Bet The U-joint And Yokes Are Binding Causing Stress On The Straps And Bolts. You May Be Able To Do A Little Grinding. Or The More Expensive Route , Bigger Joints. You Probaly Have A 1350 Joint. If So Go To A 1410. I Hope The Info Helps. Looks As Though You Have Fun With Your Ride, I Can Apreciate That, Bighead

07-09-2008, 07:14 PM	#10
dammitmitchell the pollock Join Date: May 2008 Location: abilene, texas Posts: 4,423	Re: Help! Front drive shaft keeps "falling" out. i had that issue also i used a bore brush to a 380 pistol on a cleaning rod with my drill, then sijmmplegreen ord driveway cleaner ... __________________ Jack of ALL trades, Master of none.. (but one... procrastination) Army vet 02-08 RIP El Jay! Miss you brother! http://67-72chevytrucks.com/vboard/s...d.php?t=343538 http://67-72chevytrucks.com/vboard/s...d.php?t=386042

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