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#26 |
Registered User
![]() Join Date: Mar 2018
Location: New Jersey
Posts: 377
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Re: Replacing the flexplate without removing engine or transmission
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#27 |
Senior Member
![]() Join Date: Apr 2016
Location: Cypress, TX
Posts: 3,703
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Re: Replacing the flexplate without removing engine or transmission
I ordered it from eBay by searching for "Bracket 3965589". It should be for a 350 with 168 tooth flex plate and starter with diagonal mounting holes, if I believe the Internet.
http://www.ebay.com/itm/272011458486 I'll let you guys know how it goes when I try to install it. |
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#28 |
Registered User
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Location: New Jersey
Posts: 377
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Re: Replacing the flexplate without removing engine or transmission
Thanks
My son and I started on it yesterday, got all the bolts out in the bell housing with the middle one on the driver side the 4-inch bolt is too long it hits the body. All the other bolts we're no problem. So I'm going to try and put it in three and a half inch bolt in that spot and proceed according to your plan. With mine having the transfer case being a four-wheel drive I have to also figure that out. I'm thinking I might have to remove those brackets that hold it and at the same time support it along with the transmission to slide it back. If that doesn't work I'll probably end up having to drop the transmission do the job and then have the pain in the ass task of lining up the dowels when I reinstall it. Wish me luck. |
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#29 |
Senior Member
![]() Join Date: Apr 2016
Location: Cypress, TX
Posts: 3,703
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Re: Replacing the flexplate without removing engine or transmission
If you figure out a good way to get it done, post some pictures. abig84 had an interesting comment earlier about just needing a small amount of space opened up, just enough to get wrenches in there. The way I did it I had a luxurious amount of room, but that was probably overkill. You may be able to get by using abig84's method.
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#30 |
Registered User
![]() Join Date: Mar 2018
Location: New Jersey
Posts: 377
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Re: Replacing the flexplate without removing engine or transmission
yeah I'm thinking I don't need all the space you had. I'm a pretty skinny guy with skinny forearms and skinny hands and skinny fingers, LOL and my son, 16 years old he's even skinnier still. I'll take a bunch of pictures and post them in this thread.
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#31 |
Registered User
![]() Join Date: Mar 2018
Location: New Jersey
Posts: 377
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Re: Replacing the flexplate without removing engine or transmission
How many bolts are supposed to be holding the flexplate to the torque converter? I'm thinking somebody did a s***** job. I have them all out and there are only three. 1972 Chevy Blazer automatic transmission. Th350 with a 350 SBC.
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#32 |
Senior Member
![]() Join Date: Apr 2016
Location: Cypress, TX
Posts: 3,703
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Re: Replacing the flexplate without removing engine or transmission
There are just 3 flexplate-to-torque-converter bolts on my 350 engine with TH400 transmission.
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#33 |
laying low
![]() Join Date: Mar 2001
Location: Searcy, Ark. USA
Posts: 13,232
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Re: Replacing the flexplate without removing engine or transmission
The long bolts deal to slide the trans back for clearance is a neat deal but me, I would take this opportunity to replace the front pump seal while it is apart. If it has been in there for a long time and is now disturbed it could go to leaking once you button it back up. This means the trans will most likely have to be lowered to remove the torque converter and replace the seal. It's cheap insurance.
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__________________
Boog 69 Chevy stepside, 358/T350, 4.11 posi, 4.5/4 drop, rallys, poboy driver primer is finer 91 Chevy sportside, Tahoe, Yukon & GMC Crewcab All GM..'nuff said. I stand for the flag and kneel at the cross |
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#34 |
Registered User
Join Date: Aug 2018
Location: Bronx, NY
Posts: 215
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Re: Replacing the flexplate without removing engine or transmission
I think if you look at your torque converter you will only see 3 places to run bolts into.
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#35 |
Registered User
Join Date: Oct 2012
Location: Green Valley Arizona
Posts: 1,351
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Re: Replacing the flexplate without removing engine or transmission
Five bolts holding the flexplate to the crank and three bolts hold the torque converter to the flexplate.
__________________
1970 C10 Short Stepper with 71/72 front clip. |
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#36 |
Registered User
![]() Join Date: Mar 2018
Location: New Jersey
Posts: 377
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Re: Replacing the flexplate without removing engine or transmission
Thanks oh, I thought three was half as many as necessary. Glad to hear it was not a problem. I'll look into that front pump seal while I have it open, thanks.
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#37 | |
Registered User
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Location: New Jersey
Posts: 377
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Re: Replacing the flexplate without removing engine or transmission
Quote:
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#38 |
laying low
![]() Join Date: Mar 2001
Location: Searcy, Ark. USA
Posts: 13,232
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Re: Replacing the flexplate without removing engine or transmission
Yes. The pump seal is behind the converter.
__________________
Boog 69 Chevy stepside, 358/T350, 4.11 posi, 4.5/4 drop, rallys, poboy driver primer is finer 91 Chevy sportside, Tahoe, Yukon & GMC Crewcab All GM..'nuff said. I stand for the flag and kneel at the cross |
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#39 |
Registered User
Join Date: Aug 2018
Location: Bronx, NY
Posts: 215
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Re: Replacing the flexplate without removing engine or transmission
I dunno, maybe a rear main seal?
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#40 |
Registered User
![]() Join Date: Mar 2018
Location: New Jersey
Posts: 377
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Re: Replacing the flexplate without removing engine or transmission
And by the way I did not buy the flywheel spinner. I simply put a wrench to each side of the flexplate to torque converter bolts and took them off. before I took off the second one I moved the flexplate to the position of the first one by doing it with only one wrench which then exposed the third one removed the second one, and moved to the other side of the transmission to get the third one, and it wasn't a problem. Hope that makes sense.
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#41 |
Registered User
![]() Join Date: Mar 2018
Location: New Jersey
Posts: 377
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Re: Replacing the flexplate without removing engine or transmission
I thought about that, I believe it's a two-part seal based on my research. I think I might, if it's not leaking, leave that alone. I definitely have a leak but as others have suggested it might be from the intake manifold it seems there's oil all on the back of the engine from that height on down. Lots of nuts and bolts are coming out easy because of the lubrication, LOL
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#42 |
Registered User
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Location: New Jersey
Posts: 377
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Re: Replacing the flexplate without removing engine or transmission
So what are the other holes for? Not mine by the way.
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#43 |
laying low
![]() Join Date: Mar 2001
Location: Searcy, Ark. USA
Posts: 13,232
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Re: Replacing the flexplate without removing engine or transmission
If you are referring to the outward set of holes there are 6. If I'm not mistaken there are two patterns there. One set of holes fit a T350 converter and one set fit a T400 converter, I believe. It's been a while..
__________________
Boog 69 Chevy stepside, 358/T350, 4.11 posi, 4.5/4 drop, rallys, poboy driver primer is finer 91 Chevy sportside, Tahoe, Yukon & GMC Crewcab All GM..'nuff said. I stand for the flag and kneel at the cross |
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#44 |
Senior Member
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Location: Near Canon City ,Colorado
Posts: 3,970
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Re: Replacing the flexplate without removing engine or transmission
That is correct, they are a different diameter .
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'35 1/2 ton Pickup (bought 2020) '68 C10 Suburban (bought 2021) '72 K5 Blazer (bought 2013) '67 Stepside (bought 1997-sold 2021) '96 Bronco Eddie Bauer (inherited 2010) My 1st day here-'67 C10(sold)and '72 K5 Blazer http://67-72chevytrucks.com/vboard/s...d.php?t=702056 "Another Blue Chevy"(1935) http://67-72chevytrucks.com/vboard/s...d.php?t=799203 ![]() ![]() Last edited by 3757chevy; 11-19-2018 at 01:30 AM. Reason: add picture |
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#45 |
Registered User
Join Date: Feb 2011
Location: Parkville, MD
Posts: 1,024
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Re: Replacing the flexplate without removing engine or transmission
I take a bolt, cut the head off, grind it so it is a bit more pointy like a dowel, and cut a slot in it so you can install / remove with a screwdriver. Make 2. Put them in place of transmission bolts. Use them to line up the transmission. Once the transmission is in put a couple other bolts in, the pull out the studs and install bolts. It's a bit easier than the dowels alone as they are bigger and longer. Really helps when you have a manual transmission and need to line it up just right to get the pilot bearing in.
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1970 C20 Custom Camper - 350, TH350 1997 GMC Suburban 1994 Acura Integra GSR 1987 Dodge Daytona Shelby Z |
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#46 | |
Registered User
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Location: New Jersey
Posts: 377
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Re: Replacing the flexplate without removing engine or transmission
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#47 |
Senior Member
![]() Join Date: Apr 2016
Location: Cypress, TX
Posts: 3,703
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Re: Replacing the flexplate without removing engine or transmission
It looks like in my pictures I did not show the parts of the flex plate where the teeth were ground up. It was really messed up bad, but had some good sections with some good teeth left. I could start the truck if the engine happened to stop at a place with good teeth where the starter engaged.
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#48 | |
Registered User
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Location: New Jersey
Posts: 377
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Re: Replacing the flexplate without removing engine or transmission
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#49 |
Senior Member
![]() Join Date: Apr 2016
Location: Cypress, TX
Posts: 3,703
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Re: Replacing the flexplate without removing engine or transmission
My starter was OK. I had a saga going on at the time, and the Reader's Digest version is I thought (due to my improper diagnosis) I had a bad starter, and replaced it with Skip White's best mini starter, which promptly chewed up my flexplate. I then replaced the correct bad component on my truck, which was the positive battery cable, and put the original starter back on, and replaced the flexplate. The original starter works great. I am a lousy shimmer, but I have a shade tree mechanic friend who shimmed it for me.
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