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Username Post: removal of propeller shaft        (Topic#351043)
VanLife 
Contributor
Posts: 111

Reg: 03-20-18
05-09-18 05:15 PM - Post#2733549    

1987 GMC vandura 2500 v6 4.3l split driveshaft

Wondering how to get it off, so I can move the trans. back to access flex plate for inspection and possible repair.

It does not "show" how to do it in the service manual.

Mine is the one where the front segment is the part where it slips over the top of the driveshaft going to the back. where you have the bushing holder? right after the short piece. If this can be removed it allows the trans to move back about 1ft straight back before hitting the head of the rear segment of driveshaft.

I don't know how to disengage it without taking the entire drive train apart. I believe there is a way to get it disconnected without having to remove the bushing holder that raps around the long driveshaft segment going to back.

My transmission is the one with 2 support bars bolted to the front bottom protective cover protecting the flex plate and starter head. The support bars also goes up and bolts to the engine side mount bracket, to lock the trans to the engine from the bottom.

I would be doing this alone on the ground.

I believe the flex plate is broke or a bearing internal on the back end is bad.

Due to torsion wheel being shot to hell and the bolt holding it in place was not tight when removing it. Also the vibration changes based on idle speed acceleration and other factors.

I can not afford to get gouged ~300$ by a mechanic to replace a $40 part if it is cracked or damaged.

I rather pay the $40flex plate and $69(floor rolling jack)

I have not done this and would be doing it alone I intended to park my van facing down a slope to make it easier to put the trans back in with assistance from gravity.



Edited by VanLife on 05-09-18 05:22 PM. Reason for edit: No reason given.

 
VanLife 
Contributor
Posts: 111

Reg: 03-20-18
05-09-18 05:23 PM - Post#2733553    
    In response to VanLife

do I have to worry about the torque converter sliding off the end of trans??



 
VanLife 
Contributor
Posts: 111

Reg: 03-20-18
05-10-18 04:28 PM - Post#2733642    
    In response to VanLife

correction I do have a 2 ft section driveshaft connected directly to back of trans. the disconnect yoke is after the hanger bushing.

WHAT a PAIN just to check flex plate under the bell house cover. Tried, Can't get the cover off without moving coolant lines and exhaust pipes since mine are welded from muffler to the exhaust manifold. and there is a portion of the cover that raps around the starter that won't clear due to coolant lines location.




 
gchemist 
Senior Chevytalk Moderator
Posts: 24388
gchemist
Loc: Austin, TX 78748
Reg: 05-09-00
05-13-18 11:32 AM - Post#2733873    
    In response to VanLife

Ouch!! I've never worked on a dual shaft van. I'm not familiar with them. I've worked on trucks with dual shafts. If you can remove the cover plate, use a large pry bar or screw drive to turn over the flexplate. A good small mirror and light will help inspect the flex plate. Missing or broken teeth will throw off balance.

'95 Jimmy SLT (Bought @131,814)
'83 Silverardo XST - ZZ4 powered
'96 GMC Jimmy LS Ret. @236651 miles


 
VanLife 
Contributor
Posts: 111

Reg: 03-20-18
05-23-18 03:29 PM - Post#2734770    
    In response to gchemist

"Q transmission" would not test drive it and claimed it was not the flex plate, causing the rattling. He claimed it couldn't. unless you lost the balance weight of course.

I had the timing reset, it helped remove the worst of the rattling but its still there and at times if feels like metal clicking against metal somewhere. and at other times it gets more intense in the rattle.



 
VanLife 
Contributor
Posts: 111

Reg: 03-20-18
05-23-18 03:58 PM - Post#2734776    
    In response to gchemist

I would rather use a BFW on the camshaft bolt to turn it.

Old flex plates are known to crack or break when using pry bars on the teeth to turn it.



 
1983G20Van 
Super Senior Member
Posts: 3706
1983G20Van
Loc: Bedford, Texas, USA
Reg: 11-13-02
05-26-18 07:32 PM - Post#2734995    
    In response to VanLife

  • VanLife Said:
I would rather use a BFW on the camshaft bolt to turn it.

Old flex plates are known to crack or break when using pry bars on the teeth to turn it.



Yep I use a 1/2" drive breakover bar or ratchet with a cheater pipe, a 6" long extension and I believe a 5/8 socket to turn the engine over when removing torque converter bolts and the like.

1983 G20 Van, 350 TPI, Ported 906 Vortecs, Edelbrock 3817 Base, ASM oversize runners. Reed Custom Roller cam, 700r4, 12 bolt with 3.08 gears, Doug Thorley Tri-Y headers, true duals


 
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