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Crossmember help

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Old Jul 11, 2013 | 12:32 PM
  #1  
grover85's Avatar
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From: New Germany, MN
Car: 1986 Iroc
Engine: 5.3
Transmission: 4L80E
Axle/Gears: 9 Inch w/ 3.55
Crossmember help

I need a measurement if someone has there car in the air. I am building a cross member for my 4l80. The problem is my cross member is spanning from my subframe connectors not the stock cross member mounting points. I am looking for a measurement from each pinch rail to center of the transmission mount so I can make sure my drive train is in square.
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Old Jul 11, 2013 | 12:39 PM
  #2  
fireturd350's Avatar
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From: New Boston, IL, USA
Car: '90 Formula 350
Engine: 383 SBC
Transmission: ProBuilt S/S 700-R4 & ACT 9" Stall
Axle/Gears: 10 bolt 3.23
Re: Crossmember help

You should just measure on your car. Nothing about these cars are usually square at this point.
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Old Jul 11, 2013 | 12:48 PM
  #3  
grover85's Avatar
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From: New Germany, MN
Car: 1986 Iroc
Engine: 5.3
Transmission: 4L80E
Axle/Gears: 9 Inch w/ 3.55
Re: Crossmember help

What I am curious about is if the transmission is centered or offset in these cars.
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Old Jul 11, 2013 | 12:55 PM
  #4  
fireturd350's Avatar
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From: New Boston, IL, USA
Car: '90 Formula 350
Engine: 383 SBC
Transmission: ProBuilt S/S 700-R4 & ACT 9" Stall
Axle/Gears: 10 bolt 3.23
Re: Crossmember help

If I had to guess I would say slightly offset to the passenger side because that's how the motor is set in there for more steering linkage room.
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Old Jul 11, 2013 | 01:10 PM
  #5  
grover85's Avatar
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From: New Germany, MN
Car: 1986 Iroc
Engine: 5.3
Transmission: 4L80E
Axle/Gears: 9 Inch w/ 3.55
Re: Crossmember help

Originally Posted by fireturd350
If I had to guess I would say slightly offset to the passenger side because that's how the motor is set in there for more steering linkage room.
That is kind of what I am thinking. Just looking for a measurement so I can get an idea on locating it.
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Old Jul 11, 2013 | 02:25 PM
  #6  
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From: Shakopee, Mn
Car: 89 Iroc
Engine: 305TPI
Transmission: T5
Re: Crossmember help

I completely forgot you asked for this. I will put a reminder in my phone to do it tonight and I will text you with what I find when I get it done. Sorry about that.

Evan
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Old Jul 16, 2013 | 10:32 PM
  #7  
grover85's Avatar
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From: New Germany, MN
Car: 1986 Iroc
Engine: 5.3
Transmission: 4L80E
Axle/Gears: 9 Inch w/ 3.55
Re: Crossmember help

Bump, I know Evan has allot going on. I tried to test fit my driveshaft and it wont clear my bmr track pak torque arm. I tried prying the transmission over but I am getting minimal movement. My engine is an ls engine with solid motor mounts. This is sitting on a pa racing k member. I know the transmission it to far over to the driver side but unsure on how much it is. I already loosened the engine mount bolts.
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Old Jul 18, 2013 | 09:23 AM
  #8  
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From: NC
Car: 91 Trans Am
Re: Crossmember help

Drill out the mount holes for more play, but don't expect much play. Don't worry about side to side alignment beyond driveshaft clearance
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Old Jul 19, 2013 | 04:47 PM
  #9  
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From: New Germany, MN
Car: 1986 Iroc
Engine: 5.3
Transmission: 4L80E
Axle/Gears: 9 Inch w/ 3.55
Re: Crossmember help

Well after doing allot of measuring I figured out the engine mounts on the k member are on there wrong. PA racing said they would re jig it up at no charge but I pulled the trigger on a motor plate and mid plate from aei. So I will get this figured out when the plates get here.
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