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Wiring 99 4l60e 4x4 tranny from suburban to 98 pickup problem

We did an engine and transmission swap from a 99 suburban to a 98 pickup and the transmission wires don't plug in to transmission. What needs to be done to make the combination work?

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  • Chevrolet Master
  • 2,122 Answers

Hi Jesse, You need to get the correct management system and probably the wiring harness to go with it. It will also require someone conversant with electronics and who knows the circuit of the vehicles concerned. Regards John

Posted on Nov 28, 2013

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Posted on Jan 02, 2017

  • 14 Answers

SOURCE: transmission swap

yup, the motor and drive train are the same... if the wheel base is the same between the two trucks, than you can also use the drive shaft from it too

Posted on Feb 28, 2009

stumann2
  • 193 Answers

SOURCE: swapped tranny, just need help with matching up wiring

It won't work. The shifting of the 4L60E is done by the computer in the 93. You might check with Summit or Jegs, I think they make a system to make it work.

Posted on Feb 20, 2010

Tnsiouxfalls
  • 617 Answers

SOURCE: Engine swap. color codes are different need wiring diagram

I've done several of these swaps that sound good at the time but end up being a Huge problem.I would start with the correct harness for the engine you've put in.It must include the under hood harness and what ever harness connects to it thru the firewall to the computer.You'll also need everything connected to the transmission to the computer including any thing connected with the brake and accelerator pedals.Next get the wiring diagrams from Jeep or buy the Chilton or Haynes manual,they have the diagrams included.Get the harnesses connected to the engine,trans and computer,then work backward towards hooking up everything else.I really feel your pain,I've put 20 year newer engines in older cars,V-8's where 6's were,an olds V-8 where a in-line six was(ford),Late model v-8 in a 59' Chevy.All these were simple compared to what your going thru.Please contact me if I can be of any help?

Posted on Feb 21, 2010

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Swapped tranny, just need help with matching up wiring


It won't work. The shifting of the 4L60E is done by the computer in the 93. You might check with Summit or Jegs, I think they make a system to make it work.

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