I have both a 94 and 96 Z28's. The 96 I ly has 100,000 original miles. The 94 has 320,000 (almost all the miles are interstate miles). My ring gear in the 96 broke a chunk of tooth off and caused massive failure the hole housing is basically scrap. the 4L60 is out of the 94 and I rebuilt the rear end a few years ago. I decided to just swap the housing gears axles as a unit from the 94 to the 96 I have everything done starts drives fine no nasty sounds or any other weirdness except I can not seem to come up with a way around the abs hook up ( pictures below) or a way to bypass anything would be help full at this point. I have a lil brake pedal but not enough to go for a cruz I tried taking the abs relay out to turn it off or bypass idk really kinda grasping at straws but it took all the pedal away. Have bleed several times no air. Thanks for any help
update when I added the pictures it would not let me so in the order you see them I'll give a brief description.
1.gear on acle that sensors reads on 96 .also can see the sensor.
2.94 gearless.
3 96 wiring from plug behind back driver wheel to diff.
4 sensor for 96 at axle. 94 is very similar do not have a picture tho.
5 96 sensor plug in.
6 96 plug in behind wheel just has 2 more leads for extra sensor
7 94 wiring from wheel to top of dif housing.
8 94 sensor plug same as 96
9 94 plug behind wheel is just missing extra leads
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Apparently your 96 has both ABS and ASR (traction control) = 4-channel system. Your 94 only has ABS = 3-channel system. The ABS+ASR computer (EBTCM) in you 96 will only work with independent wheel speed readings from EACH rear wheel. It is not the same as the ABS only computer (EBCM) in your 94 that relies on a single rear wheel speed sensor on the differential housing.

Even if you could wire two sensors to the single wheel speed sensor on top of the 94 differential housing, the number of teeth on the reluctor wheel that the sensor reads is way larger than the number of teeth on the smaller reluctor wheels on the 96 axles. I don't think the EBTCM can function correctly with such a huge mismatch between the speed indicated by pulses from the from the front wheel sensors and the 94’s much higher rear wheel speed indicated by the higher number of teeth on the 94 reluctor.

Maybe someone has figured this out, but I don’t recall seeing a solution here. Maybe someone else may see this and have more info, but there aren’t many active member here any more. One thought might be to replace the 96 EBTCM with your 94 EBCM, use only the single sensor on the diff housing, probably need to reprogram the PCM to delete the ASR, and even remove or bypass the ASR servo motor on the driver valve cover, possibly requiring new cables for the cruise control and the accel pedal. Probably simpler and cheaper to just find a used 4-channel rear axle assembly.

 

I have thought of all of that and I'm about to the same conclusion. I can't find anything about swapping a 94 to 96. I'm about to just look for a decent upgrade. If you don't mind me asking I see you have 4.11's I had a 3.43 in the 96 before this happened and I was pretty satisfied what kind of speeds do you get just cruising or going threw the gears on the high ends? I know mine isn't as built as yours just trying to get a idea and trying to decide what to put in next. Thanks for the reply btw

 

My experience with the 4.11's doesn't relate to your setup. I ran (car has been sold) a 3-speed TH400 trans (no O/D), with a Gear Vendors 0.78:1 overdrive. Even with the O/D engaged, on street tires it was over 3,000 RPM at 70 MPH. The 4.11's were selected based on track use with a 5,000 - 7,000 RPM power band, not daily driving.

My 94 was originally a T56, 3.42 rear. Ran about 1,600 TPM in 6th gear at 70 MPH. I swapped in a Strange 12-bolt with 3.73's, and I was not impressed. Wished I had opted for the 4.11's. The steep O/D 6th gear in the T56 makes the cruise RPM relatively painless. Numerically, if you're cruising at 1,600 RPM @ 70 MPH with a 3.42, you'll see 1,745 RPM with 3.73's and 1,918 RPM with 4.10's.