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

trans mount to crossmember nut size?

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Old Jul 15, 2014 | 09:42 AM
  #1  
Mrbanados's Avatar
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Car: 84 Camaro z28
Engine: 355
Transmission: Th350
Axle/Gears: 4.10
trans mount to crossmember nut size?

Just recently swapped out my oil pan and I lost the nut for the trans mount to crossmember,didn't realize it until I went to test drive it and the trans damn near came through the tunnel. It's a t-5 tranny and there's only one nut that holds it on. I know I used a 5/8 socket to take it off. Does anyone happen to know the nut size/thread pitch?
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Old Jul 15, 2014 | 09:54 AM
  #2  
I H8 WWD's Avatar
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From: Cleveland, Ohio
Car: 89' IROC-Z
Engine: LO3
Transmission: 700R4
Axle/Gears: 10-Bolt/2.73
Re: trans mount to crossmember nut size?

I can check my stock unit off my auto 700R4, but not until after work...around 6pm EST.

Best thing I ever bought for these problems. I'm CONSTANTLY using these. I'm always trying to replace rusted bolts and such with new ones, so these are always by my side.
US Thread Gauge
Metric Thread Gauge

I replaced my stock unit with a Prothane poly unit and the nut was a different size. IIRC 14mm.
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Old Jul 15, 2014 | 10:04 AM
  #3  
Mrbanados's Avatar
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Joined: Aug 2013
Posts: 326
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Car: 84 Camaro z28
Engine: 355
Transmission: Th350
Axle/Gears: 4.10
Originally Posted by I H8 WWD
I can check my stock unit off my auto 700R4, but not until after work...around 6pm EST.

Best thing I ever bought for these problems. I'm CONSTANTLY using these. I'm always trying to replace rusted bolts and such with new ones, so these are always by my side.
US Thread Gauge
Metric Thread Gauge

I replaced my stock unit with a Prothane poly unit and the nut was a different size. IIRC 14mm.
Alright if you can that would be great, if I can't figure it out I'll just grab a few different sizes from the bolt store lol
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Old Jul 15, 2014 | 08:18 PM
  #4  
I H8 WWD's Avatar
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Joined: Aug 2006
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From: Cleveland, Ohio
Car: 89' IROC-Z
Engine: LO3
Transmission: 700R4
Axle/Gears: 10-Bolt/2.73
Re: trans mount to crossmember nut size?

Alright, sorry about the delay. This is as close as I could get as the rubber interfered with my gauges. I see I may want some straight ones too lol.

The US sizes were all loose and what I would say not even close in pitch.

I'm seeing the stock mount stud as a 10mm x 1.5mm with a 15mm flange nut. The threads are coarse. 1.25mm looks close, but is fine thread. I hope this is a good start. Sorry I couldn't get a better measurement of the pitch.

http://www.boltdepot.com/Product-Det...?product=12006
http://www.boltdepot.com/Product-Det...?product=10688
Attached Thumbnails trans mount to crossmember nut size?-img_20140715_205740.jpg   trans mount to crossmember nut size?-img_20140715_210017.jpg  

Last edited by I H8 WWD; Jul 15, 2014 at 08:27 PM.
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Old Jul 15, 2014 | 09:58 PM
  #5  
plum92_camaro's Avatar
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From: Iowa
Car: 92 Camaro RS
Engine: LS1
Transmission: T56
Axle/Gears: 10bolt w3.42 Torsen
Re: trans mount to crossmember nut size?

Originally Posted by I H8 WWD
Alright, sorry about the delay. This is as close as I could get as the rubber interfered with my gauges. I see I may want some straight ones too lol.

The US sizes were all loose and what I would say not even close in pitch.

I'm seeing the stock mount stud as a 10mm x 1.5mm with a 15mm flange nut. The threads are coarse. 1.25mm looks close, but is fine thread. I hope this is a good start. Sorry I couldn't get a better measurement of the pitch.

http://www.boltdepot.com/Product-Det...?product=12006
http://www.boltdepot.com/Product-Det...?product=10688
it is metric.
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