Transmissions and Drivetrain Need help with your trans? Problems with your axle?

Torque Converter bolt size?

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Old Mar 12, 2009 | 02:17 PM
  #1  
shanewbenson's Avatar
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Car: 1992 RS
Engine: 305 TBI
Transmission: IROC 700R4
Torque Converter bolt size?

Ok so it's time to switch out my 700r4 in my 92 305 TBI with a manual transmission. I have all the bolts out except for the middle bell housing bolts on the left and right (The ones that sit down in the holes). Does anyone know the size of these bolts or how to remove them? All the sockets i have tried to use are either to big to fit down in the hole and the ones that do fit dont grab onto the bolt head. Please help.
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Old Mar 12, 2009 | 07:27 PM
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ttypecamaro's Avatar
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From: Baltimore, MD
Car: 09 Cobalt SS Sedan. 92 Z28 vert
Engine: 2.0T EFR6758; 5.0TT T3/T4 8psi
Transmission: F40; 700r4
Axle/Gears: 3.76 LSD; 3.23 posi
Re: Torque Converter bolt size?

they're 9/16" hex head, with 3/8-16 threads.

I made a tiny dent in the firewall with a screwdriver right at the center of those two bolt heads. Then went inside the car, pulled the carpet up a little, and drilled 1 inch holes in the firewall right over the middle bellhousing bolts on each side. Its really easy to get them out now. I call it the "quick-change tranny mod."
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Old Mar 12, 2009 | 09:15 PM
  #3  
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From: 51°N 114°W, 3500'
Car: 87 IROC L98
Engine: 588 Alcohol BBC
Transmission: Powerglide
Axle/Gears: Ford 9"/31 spline spool/4.86
Re: Torque Converter bolt size?

Bellhousing bolts are 3/8" NC should use a 9/16 socket or wrench.

I did pull a 700R4 out of a pickup truck that used metric bolts/studs and I needed a 13mm socket to take the nut off the stud.

Third gen bellhousing bolts are difficult to access. I use a swivel socket most of the time to access those upper bolts. Once the tranny is out, a really big hammer can dent the firewall to make access a little easier. Eventually my car will have a removable tranny tunnel to make access even easier.
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Old Mar 13, 2009 | 12:10 PM
  #4  
shanewbenson's Avatar
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Car: 1992 RS
Engine: 305 TBI
Transmission: IROC 700R4
Re: Torque Converter bolt size?

thanks for all the quick replies. I was able to drop the transmission out last night. the only issue now is one torque converter bolt is really messed up and i cant get it out. its rounded. any ideas? As of now tranny is out but torque converter is stuck to my engine.
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Old Mar 13, 2009 | 12:14 PM
  #5  
ttypecamaro's Avatar
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From: Baltimore, MD
Car: 09 Cobalt SS Sedan. 92 Z28 vert
Engine: 2.0T EFR6758; 5.0TT T3/T4 8psi
Transmission: F40; 700r4
Axle/Gears: 3.76 LSD; 3.23 posi
Re: Torque Converter bolt size?

got a gator grip?

Sears sells sockets that bite into bolt heads that are rounded... like $20 a set.
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Old Mar 14, 2009 | 07:30 AM
  #6  
shanewbenson's Avatar
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Car: 1992 RS
Engine: 305 TBI
Transmission: IROC 700R4
Re: Torque Converter bolt size?

I tried the sears things and they just made it worse. this bolt is very messed up now. I'm not sure what a gator grip is
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Old Mar 14, 2009 | 07:54 AM
  #7  
ttypecamaro's Avatar
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From: Baltimore, MD
Car: 09 Cobalt SS Sedan. 92 Z28 vert
Engine: 2.0T EFR6758; 5.0TT T3/T4 8psi
Transmission: F40; 700r4
Axle/Gears: 3.76 LSD; 3.23 posi
Re: Torque Converter bolt size?

a gator grip may not work at this point.

http://www.endeavortool.com/

you could try grinding the head of the bolt off.
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Old Mar 14, 2009 | 12:34 PM
  #8  
shanewbenson's Avatar
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Car: 1992 RS
Engine: 305 TBI
Transmission: IROC 700R4
Re: Torque Converter bolt size?

OK say i'm able to cut the head of the bolt off, will the torque converter then come right off or will the threads still hold it in place?
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Old Mar 14, 2009 | 05:33 PM
  #9  
ttypecamaro's Avatar
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From: Baltimore, MD
Car: 09 Cobalt SS Sedan. 92 Z28 vert
Engine: 2.0T EFR6758; 5.0TT T3/T4 8psi
Transmission: F40; 700r4
Axle/Gears: 3.76 LSD; 3.23 posi
Re: Torque Converter bolt size?

It'll fall right off... If you don't get the whole head off it will seem like it doesn't want to come off. At that point you can pry it apart or grind some more. You'll have the torque converter off, but then you'll need tyo remove the cut-off bolt from the converter if you are re-using it.
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