90' engine in 87' w/ tranny issues.

chash360 · 12-09-2006, 12:54 AM

I took my 1990 7MGTE and put it a an 1987 (replacing a 7MGTE that threw a rod), and used the 87' wiring harness, because all the engine side component plugs matched, not so on the chassis/computer side.

It runs great and smooth, but a little sluggish, especially off the line. I am wondering if there is a major difference in the transmissions or torque converters between 1987 and 1990? I do know the Tranny computer interface is different which is why I did not also put the 90' tranny in with the motor.

If there is a difference, can it be addressed with the proper torque converter or do I need to work installing the 1990 tranny and computer.

dcrusupra · 12-09-2006, 01:33 AM

Are you using the 90 ECU with the 87 wiring harness?

chash360 · 12-11-2006, 05:39 PM

No, all 1987 computer and wiring. The only 1990 components are items on the engine itself (injectors, sensors, etc). It was because the ECU and other chassis-side connections did not match up, that I connected using the 1987 wiring.

12-09-2006, 12:54 AM	#1
chash360 Stock Join Date: Dec 2006 Location: Oregon Posts: 14	90' engine in 87' w/ tranny issues. I took my 1990 7MGTE and put it a an 1987 (replacing a 7MGTE that threw a rod), and used the 87' wiring harness, because all the engine side component plugs matched, not so on the chassis/computer side. It runs great and smooth, but a little sluggish, especially off the line. I am wondering if there is a major difference in the transmissions or torque converters between 1987 and 1990? I do know the Tranny computer interface is different which is why I did not also put the 90' tranny in with the motor. If there is a difference, can it be addressed with the proper torque converter or do I need to work installing the 1990 tranny and computer.

12-09-2006, 01:33 AM	#2
dcrusupra 500whp yet? Join Date: Aug 2005 Location: Plantation, Fl. Posts: 1,052	Are you using the 90 ECU with the 87 wiring harness? __________________ New Rebuild My CarDomain

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12-11-2006, 05:39 PM	#3
chash360 Stock Join Date: Dec 2006 Location: Oregon Posts: 14	No, all 1987 computer and wiring. The only 1990 components are items on the engine itself (injectors, sensors, etc). It was because the ECU and other chassis-side connections did not match up, that I connected using the 1987 wiring.