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Username Post: HOW HARD IS IT TO CHANGE THE FLEXPLATE?        (Topic#136793)
SBNOMAD 
Senior Member
Posts: 119
SBNOMAD
Loc: Santa Barbara, Ca
Reg: 02-27-05
07-25-06 02:17 PM - Post#975050    

Hi, My sons 94 astro has a problem. I just replaced the starter and apparently the flexplate has one or more teeth gone. The starter works fine most times then once in awhile it just spins without turning over the engine. If I turn the engine over by hand just a little bit it works fine again.

HOW HARD IS IT TO CHANGE THE FLEXPLATE?
Is this something I can do in my garage with average skills and tools? Or should he pay the $400 plus labor to have a shop do it?
I have helped my son and his young family alot in the past keeping the astro going, they do not have alot of $$$ to throw around. If I can do it with his help over the weekend I will. The part only cost $67 and is available.
Thanks, Roger

1957 Nomad 1980 Corvette


 




raycow 
DECEASED
Posts: 27999
raycow
Loc: San Francisco, CA
Reg: 11-26-02
Re: HOW HARD IS IT TO CHANGE THE FLEXPLATE?
07-25-06 08:28 PM - Post#975051    
    In response to SBNOMAD

Replacing the flexplate is easy. It's getting the transmission out and back in that's the hard part.

Seriously though, first save yourself some possibly unnecessary work. Take off the bellhousing bottom cover and put a mark on the flexplate. Next, turn the flexplate through a full revolution by hand so you can look at all the teeth. If you do find any bad teeth, then go ahead and pull the tranny. If you don't, then the starter drive is suspect.

Ray

Those who choose an automatic transmission want transportation. Those who choose a manual transmission want to drive.


 
GMBOB 
Senior Member
Posts: 558

Loc: WARREN,MI,USA
Reg: 01-31-01
Re: HOW HARD IS IT TO CHANGE THE FLEXPLATE?
07-25-06 11:00 PM - Post#975052    
    In response to SBNOMAD

If you need to replace the flex plate you do not have to remove the trans. You do have to unbolt it and slide it back though. I'm not familiar with the Astro's (M-Vans). Check for cross members that would keep you from doing this. I remove the drive shaft from the rear axle and hang it. Unbolt transmission mount or crossmember to allow it to slide back. I bought 3/8-16 threaded rod and cut pieces and put a screw driver slot on the end. Then I remove the trans bolts and install th threaded rod and while supported by a jack slide the trans back enough to get wrench and/or ratchet clearance.

31 Chevy 5-Wdo Coupe
55 Chevy
55 Chevy 3200 V8 Hydramatic
56 Corvette
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86 GMC Crew Cab (500,000+ miles)
90 GMC Suburban


 
Royer 
Needs to Get Out More Member
Posts: 11411
Royer
Loc: Bloomfield Hills, Michiga...
Reg: 09-25-01
Re: HOW HARD IS IT TO CHANGE THE FLEXPLATE?
07-26-06 02:57 AM - Post#975053    
    In response to GMBOB

This will work nicely on a 2wd Astro. If the '94 your son has is the All Wheel Drive variety, though, I'm afraid it's a no-go. Personally, I'd try to nurse it along by just remembering to turn the engine over a bit whenever the starter fails to engage. You might want to keep a wrench that fits on the front crankshaft pulley fastener handy for this purpose. On a transportation vehicle that's already 12 years old, I wouldn't want to put too much into it - as something else might fail as well.

Royer



 
SBNOMAD 
Senior Member
Posts: 119
SBNOMAD
Loc: Santa Barbara, Ca
Reg: 02-27-05
Re: HOW HARD IS IT TO CHANGE THE FLEXPLATE?
07-26-06 04:54 AM - Post#975054    
    In response to Royer

Thanks, this is a 2wd astro. My daughter in law uses it mainly with 2 babies in back. She got stranded this week and I was sure it was the starter. In fact the starter drive was messed up but I guess that is what ruined the flexplate.
It needs to be fixed. I will slide under and check clearance just to slide tranny back. That would have been my first idea.
Thanks for the info, if anyone has done this and has more input please chime in.
Thanks, Roger

1957 Nomad 1980 Corvette


 
Stinky 
Senior Member
Posts: 1618

Loc: Whitewater, CO
Reg: 05-25-01
Re: HOW HARD IS IT TO CHANGE THE FLEXPLATE?
07-26-06 09:36 AM - Post#975055    
    In response to SBNOMAD

Assuming that yours is 2wd then it's not that hard.

I did it on a Suburban w/o pulling the trans. An old mechanic told me the process. He said that you don't even have to take anything loose off it, but I found that that wasn't true.

You may or may not have to remove the D-shaft and the cooler lines have to come off. Mine was a 2-piece shaft and left it on. If yours is one piece you'll have to pull it .

Then, take off the cooler lines, take all the b-housing bolts, and go get 2 bolts that are about 4-5" long, put those in the lowest holes and slid it back, w/the tail sitting on the cross-member.

Then, using a wrench, remove the torque converter...oops, sorry wrong order there, take the TC bolts loose first, as it will have to slide back w/the trans. After you get the trans and TQ slid back, use a wrench, or a cut a socket, w/a grinder so that it is REAL SHORT and take the nuts off and the F-P will drop out. I had to use a breaker bar, as there isn't enough room in there for a ratchet and then ended up making a wrench, buy cutting the end off and welding a piece of pipe on the end, as it is esaier to use then a socket.

Put the next one/FP in and reverse the process.



 
Royer 
Needs to Get Out More Member
Posts: 11411
Royer
Loc: Bloomfield Hills, Michiga...
Reg: 09-25-01
Re: HOW HARD IS IT TO CHANGE THE FLEXPLATE?
07-27-06 08:05 AM - Post#975056    
    In response to Stinky

The proceedures outlined here by GMBOB and in more detail by Stinky should work fine. I've done essentially the same thing but on non-GM products. Be extremely careful to disconnect the torque convertor from the flexplate BEFORe you actually slide the trans back - and DON'T let the torque convertor slide forward and out of the trans. Why you say? Because you will likely ruin the front seal if the torque convertor slides forward and then you WILL have to drop the trans completely to repair it. In fact, I like to take a piece of coat-hanger wire or steel crap and fashion some type of a temporary stop that will keep the torque convertor back in the transmission housing. When you're ready to button things up after putting in the new flexplate, you can then undo it.

One last caution: make certain that the flexplate you install has a ring gear with the correct number of teeth (mark and count / compare with your original). Good luck.

Royer



 
s10dude 
Senior Member
Posts: 271
s10dude
Reg: 10-28-02
Re: HOW HARD IS IT TO CHANGE THE FLEXPLATE?
07-27-06 08:22 AM - Post#975057    
    In response to Royer

I was wondering myself- would the body need to be jacked up to acess the upper bellhousing bolts, like on an s-10? How do they get the dipstick removed and out of the way, if neccesary? And also, would he need a long extension and swivel socket attatchments for those bolts? I guess since nobody's mentioned it, compressed air and impact gun are not necessary for the removal of these bolts.

1992 Chevy S10 262 ci -Rebuilt Suspension using Moog and Energy polyurethane bushings -Motor Mounts replaced -TBI Spacer -New radiatior -Camaro Rims -Dunlop Radial Rover A/Ts


 
heartfire 
Member
Posts: 11

Reg: 09-21-06
Re: HOW HARD IS IT TO CHANGE THE FLEXPLATE?
09-21-06 07:40 PM - Post#975058    
    In response to SBNOMAD

If you need to know i have an astro and i can email you step by step or you could just buy a chilton manaul
canadianbadboy85@msn.com



 




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