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Disconnecting Trans from Engine

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Old Mar 19, 2016 | 12:26 PM
  #1  
rubblerubble's Avatar
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From: TX
Car: 1992 Firebird Formula 350
Engine: 5.7L V8 L98
Transmission: 700r4
Disconnecting Trans from Engine

This is my first time pulling an engine out and I need help.
I know it's better to pull both the engine and the trans together, but our hoist isn't the best to pull both weight. I tried and the hoist started tilting a little so now I'm trying to pull just the engine. I unbolted all 6 bolts from the bell housing and the three bolts holding the torque converter from the flexplate. Pulled the engine up, but the transmission is still stuck to it. I thought it was the torque converter since there seems to be a shaft that goes into the middle of the flexplate but I doubt it now since the torque converter spins freely along with the said shaft regardless the engine is slightly pulled or not.
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Old Mar 19, 2016 | 12:38 PM
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fan1701's Avatar
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From: Benton , Arkansas
Car: 89 Z28
Engine: tbi 305
Re: Disconnecting Trans from Engine

Hi RubbleRubble. It is probably just stuck on the alignment pins. It is not unusual for them to be a little tight after being together for many years. Don't be afraid to wiggle the engine pretty rough to get it loose. You can grab the trans by the tailshaft and wiggle that also. You almost always forget to unhook something on the back of the engine so just remember to look carefully when taking the engine out. Good luck.

al
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Old Mar 19, 2016 | 12:41 PM
  #3  
fan1701's Avatar
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From: Benton , Arkansas
Car: 89 Z28
Engine: tbi 305
Re: Disconnecting Trans from Engine

One more thing that may help, ease your lift down some. To much upward pressure can make it hard to seperate them.
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Old Mar 19, 2016 | 12:56 PM
  #4  
90HSR406's Avatar
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From: lower alabama
Car: '90 RS, UH-60M
Engine: HSR'D 400
Transmission: TCI POS DONT BUY TCI!!!
Axle/Gears: Three2three
Re: Disconnecting Trans from Engine

Also, make sure you support the front of the transmission with some wood in between the transmission pan and a jack (to spread out the load)and have the crossmember bolted in to support the back of the xmsn. if you don't support it, once the engine separates, the xmsn will fall and sad faces will be had.
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Old Mar 19, 2016 | 01:01 PM
  #5  
rubblerubble's Avatar
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From: TX
Car: 1992 Firebird Formula 350
Engine: 5.7L V8 L98
Transmission: 700r4
Re: Disconnecting Trans from Engine

I'll try it out as soon as these strong winds stop. Thanks for the suggestions. Just unbolted the cross member to let me shake the tail of the transmission probably tomorrow. Got the pan jacked with a piece of wood length wise. The pan will hold the weight just fine right?
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Old Mar 19, 2016 | 01:16 PM
  #6  
antares57's Avatar
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From: Texas
Car: 91 Firebird/88 Firebird/91 Formula
Engine: V6 3.1/V8 5.0/V8 5.0
Transmission: 4L60/700R4/4L60
Axle/Gears: 3.23/2.73/2.73
Re: Disconnecting Trans from Engine

Didn't see you mention the you had removed the motor mount through bolts.
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Old Mar 19, 2016 | 05:46 PM
  #7  
90HSR406's Avatar
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Joined: Dec 2008
Posts: 49
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From: lower alabama
Car: '90 RS, UH-60M
Engine: HSR'D 400
Transmission: TCI POS DONT BUY TCI!!!
Axle/Gears: Three2three
Re: Disconnecting Trans from Engine

Originally Posted by rubblerubble
Got the pan jacked with a piece of wood length wise. The pan will hold the weight just fine right?

The pan will do just fine with the weight spread out. Make sure the converter is pushed all the way towards the xmsn so that the snout is out if the crank. I suggest using some bailing wire (or similar) to tether the converter to the xmsn to prevent it falling out. The stock converter is a solid 30 - 40 lbs when full, so be careful.
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Old Mar 19, 2016 | 07:37 PM
  #8  
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From: CT
Car: 86 Trans Am WS6
Engine: 383 stroker
Transmission: 700r4
Axle/Gears: 9 Bolt Torsen 3.70
Re: Disconnecting Trans from Engine

just gotta wiggle it. as someone said before, there's two alignment pins that are probably holding it up, you're gonna have to take the cross member bolts out of the sub frame in order to slide the trans back far enough to get the pins out.

just make sure it's supported well and do not use the torque converter to support the front of the trans. I made the fatal mistake of putting a block of wood under the torque converter to keep the front end from dipping down when putting a 700r4 into my trans am and it resulted in me leaving a trail of trans fluid around my neighborhood
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Old Mar 20, 2016 | 12:40 PM
  #9  
rubblerubble's Avatar
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From: TX
Car: 1992 Firebird Formula 350
Engine: 5.7L V8 L98
Transmission: 700r4
Re: Disconnecting Trans from Engine

Originally Posted by TylerSteez
just gotta wiggle it. as someone said before, there's two alignment pins that are probably holding it up, you're gonna have to take the cross member bolts out of the sub frame in order to slide the trans back far enough to get the pins out.
Do I need to bolt the torque arm as well to push it back? With the crossmember off it seems like I can only wiggle it up and down. Possibly sideways too but doesn't seem like I can't pull it. Just by the looks though, haven't tried it yet.

Originally Posted by antares57
Didn't see you mention the you had removed the motor mount through bolts.
I took off the long bolt right in the middle. That should be enough right?
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Old Mar 20, 2016 | 01:25 PM
  #10  
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From: Texas
Car: 91 Firebird/88 Firebird/91 Formula
Engine: V6 3.1/V8 5.0/V8 5.0
Transmission: 4L60/700R4/4L60
Axle/Gears: 3.23/2.73/2.73
Re: Disconnecting Trans from Engine

That should be enough.
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