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subframe mod and y-pipe

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Old 04-05-2017, 03:44 AM
  #1  
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Car: GTA -89
Engine: Blown 415"
Transmission: 4L80E
Axle/Gears: Strange 12-bolt
subframe mod and y-pipe

My subframe mod for better clearence for 3" exhaust since the 4L80E is bigger then a th700 and to make a stiffer torque arm crossmember.

Made some scether before I started to cut



Made a temp solution for transmission crossmember ( and it may be permanet also...)

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Driver side cut up

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Pass. side.....

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Cut the corner to make some more space...

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test mounted pass side

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Drivers side

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Drivers side

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Old 04-05-2017, 03:45 AM
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Car: GTA -89
Engine: Blown 415"
Transmission: 4L80E
Axle/Gears: Strange 12-bolt
Re: subframe mod and y-pipe

Pass. side

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Torque arm crossmember.....

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Mounting check so it would be level to the ground

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Drivers side welded...

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Pass side welded

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Torque arm cut, had to make it shorter....

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Exhaust system, dual 3" to 3,5"

Muffler under the car can be replaced by straight pipe och catalytic convertor for emission test...

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Old 04-05-2017, 06:55 PM
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Engine: 350sbc
Transmission: TH700R4
Axle/Gears: 3.42
Re: subframe mod and y-pipe

Very nice. Great work on them frame rails. And exhaust as well.
Old 04-06-2017, 12:30 PM
  #4  
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Car: 1984 Trans Am L69
Engine: Sniper EFI Powered 355
Transmission: WC T5 w/ Steel Support Plate
Axle/Gears: 3.42 10 Bolt Posi
Re: subframe mod and y-pipe

Wow nice job, very ballsy
Old 04-06-2017, 03:10 PM
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Car: 1984 Pontiac Firebird
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Transmission: 700r4
Axle/Gears: 3:73 zexel torsen
Re: subframe mod and y-pipe

Mint!
Old 04-07-2017, 05:12 AM
  #6  
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Car: GTA -89
Engine: Blown 415"
Transmission: 4L80E
Axle/Gears: Strange 12-bolt
Re: subframe mod and y-pipe

thx!

Will se if I change to dual 3".
/N.
Old 04-18-2017, 12:03 AM
  #7  
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Car: GTA -89
Engine: Blown 415"
Transmission: 4L80E
Axle/Gears: Strange 12-bolt
Re: subframe mod and y-pipe

put some paint on it...
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Old 04-18-2017, 05:47 AM
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Car: 91 Firebird
Engine: 6.0
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Re: subframe mod and y-pipe

Great job!

I wish I had those fab skills
Old 04-18-2017, 06:33 AM
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Car: 1989-92 FORMULA350 305 92 Hawkclone
Engine: 4++,350 & 305 CIs
Transmission: 700R4 4800 vig 18th700R4 t56 ZF6 T5
Axle/Gears: 3.70 9"ford alum chunk,dana44,9bolt
Re: subframe mod and y-pipe

Similar to how I did mine but I wanted a bit more stock look so I just sectioned the stock frame rails. Nice work!




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