replacing 3.1 with 3100

[tcmaster1]

I have a 93 gtz with a 3.1 auto. motor is bad. I just acquired a wrecked 95 base(80,000 miles) with 3100 auto with overdrive. What will it take to to put the 3100 with the overdrive into the gtz? Thanks in advance for the help.

[3X00-Modified]

The 3100 is a pretty easy swap to perform, you can pretty much drop it right into place of the 93 3.1 using all of the 95's accessories, just a few wiring changes to re-locate the coils and such. But to put the 4t60e in it as well your looking at doing a wiring upgrade to get to OBDI.5 the 94-95 ecu, OR use a 96 OBDII wiring setup. The transmission is electronically controlled unlike the 3-speed 3t40 you have now.

[tcmaster1]

Is there an overdrive transmission that is a simple swap into the GTZ? If so, How do I identify the transmission? I also have a low miles 2.8 with a transmission out of an 89 cutlass. I never saw the car they came out of so I don't know what it is?

[ronaconda]

There are non-electronic controlled 4-speed transmissions that you can swap in but IIRC the mount for the trans is different. Also, its tough to find a "low mile" 4t60 non-e transmission. Whenever you are in the yards, look for early 90's Lumina's and look for the RPO code GX3 on the spare tire cover (if its still there).

[tcmaster1]

thanks for the help. I have done plenty of motor swaps before but never in any front wheel drives. This will be my daughters car so I want it reliable. I just want to know what I'm getting into before I start on it. If any one wants to help with a little more detailed info I would really appreciate it. I would really like to make this an overdrive car. But it is not necessity, just a want.

[3X00-Modified]

A properly working 3speed with a good TCC lockup should be perfectly fine. I think you'll go through more of a headache trying to find/install the non E version of the 4t60 than just rebuilding or have the 3t40 rebuilt and ensure that the TCC solenoid is a good brand.

[ronaconda]

A properly working 3speed with a good TCC lockup should be perfectly fine. I think you'll go through more of a headache trying to find/install the non E version of the 4t60 than just rebuilding or have the 3t40 rebuilt and ensure that the TCC solenoid is a good brand.

For what you are wanting to do with the car, i would X2 this ^^^^^