C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

Will my diff survive?

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Old Nov 3, 2011 | 01:55 AM
  #1  
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Default Will my diff survive?

1986 Vette , auto , 3.54 rear gears in a Dana 36.
700r4 has been bulletproofed/shift kit and apart from headers and a free flow exhaust + ratio change , no other mods.

I am planning on dropping in a 400 cu inch motor , old school carburetted with a mild solid roller cam , edelbrock heads or the like , nothing too radical , just some more grunt and power over the 245 hp wimpy motor. I'm not planning on doing any racing barring maybe a run at the local dragstrip just to see what times I can do. All I really want is to make the car into a "road warrior" , something you can go out with and be a hooligan in.
My question is , is the Dana 36 strong enough to take the torque of a 400 ci motor.
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Old Nov 3, 2011 | 02:08 AM
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87 vette 81 big girl's Avatar
87 vette 81 big girl
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Originally Posted by Rodney_Gold
1986 Vette , auto , 3.54 rear gears in a Dana 36.
700r4 has been bulletproofed/shift kit and apart from headers and a free flow exhaust + ratio change , no other mods.

I am planning on dropping in a 400 cu inch motor , old school carburetted with a mild solid roller cam , edelbrock heads or the like , nothing too radical , just some more grunt and power over the 245 hp wimpy motor. I'm not planning on doing any racing barring maybe a run at the local dragstrip just to see what times I can do. All I really want is to make the car into a "road warrior" , something you can go out with and be a hooligan in.
My question is , is the Dana 36 strong enough to take the torque of a 400 ci motor.
Its a MAYBE.

Depends how hard You hookup off the line.

A built up SBC 400 ci engine can make over 600 ft/lbs of flywheel torque with modern cylinder heads, correct chosen camshaft, ect.

Switching to a modern synthetic gear oil in the Dana 36 will help durability some.
If it was my car, I would use only Royal Purple 85-140 W gear oil in your application & intended usage.

Redline Shock Proof Gear oil is very good too.

But I have found through my own long term testing,
Royal Purple 85-140 W is superior still yet today.

Brian
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Old Nov 3, 2011 | 03:44 AM
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Originally Posted by 87 vette 81 big girl
Its a MAYBE.
Depends how hard You hookup off the line.

So long as your tires spin probably be alright.
If you start getting traction then bets are off
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Old Nov 3, 2011 | 07:01 AM
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Drive it and dont worry about it.
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Old Nov 3, 2011 | 07:08 AM
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The half shafts are the weak point, i have twisted a pair recently.
Have had some steel ones made and so far so good
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