Question about 1993 GMC Sierra C3500

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My 93 gmc 4x4 was built with a standard trans i bought a new 700r aoutomatic but cant get tranny to go into overdrive should i change the computer also

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Yes if u have harness and comp 4 auto hook up to truck

Posted on Sep 29, 2009

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1 Answer

Diagram of hoses going to transmission on 93 chevy k1500 4x4


There are no vaccum hoses unless it is a TH400. The standard 4x4 overdrive trans could have a hose to the vent on top of the trans.

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Can a electical problem cause the tranny not to shift into 3rd or 4th gear in drive or overdrive rebuilt the tranny change a couple other parts still having same problem


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1 Answer

I want to swap a 700r-4 to a 4l80e.


Well, you will need the computer that controls the 4L80E because it is shifted electronically as the 700 is not - it is hydraulic. I think if you have both trucks, you swap wiring harnesses and such and it would work out.

Or you could buy a module just for working the trans but I think they are expensive.

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