The 1991 GMC Sierra typically came with the 4L60 transmission, which is a non-electronic version. The 4L60E, an electronically controlled version, was introduced in 1993. Therefore, if your 1991 model has the standard automatic transmission, it is most likely the 4L60.
NO won't work. The wiring harness for the transmission on the 90 model will not hook up to the 97 4L60E transmission. And the ECM / computor on the 90 model will no operate the 97 electronic transmission. You can NOT use anything newer then a 1991
If it's a 1/2 ton then it will be a 700R4. 3/4 ton will have a 4L60E.
That will be a 700R4 transmission.
Yes. Note that this will be a mechanical 4L60, not the electronic 4L60E, which was introduced in 1993.
You would need an electronically controlled engine with an ECM. The 700R4 in the 91 is a mechanically controlled transmission.. the 4L60E in the 95 is an electronically controlled transmission.
The 1991 Chevrolet Camaro with the 3.1-liter V6 typically came equipped with either a 5-speed manual transmission or a 4-speed automatic transmission. The specific transmission model could vary based on the trim level and options chosen. The manual option would often be the Getrag 282, while the automatic would likely be the 4L60E.
Depends on model and engine
I use Mercon Depends on make, model,............
Call your local GM dealer with the seventeen digit vin number and they will be able to tell you. NEW ANSWER: Yours has a 4L60E in it. The 1/2 tons used the 4L60E and the 3/4 tons and up used the 4L80E. They quit using the 700R4 around 1991 ( I think ) The 4L60E and the 4L80E will not interchange due to the wiring harness and ECM / computer.
Possibly. Look at the model # on each transmission. If they are the same, then they are interchangeable.
They've had the manual transmission option always. I believe 1991 was the first model year.
Yes a lt1 will fit in a 1991, but i believe the motor mounts are a little different for the lt1. You cannot transplant it though without an PCM from an lt1, which needs a 4l60E transmission to control the transmission and engine codes. There are standalone kits available but they cost more than a PCM.