I have a 87 that I have been slowly been building up. Just got a w56 trans installed and picking up 2 3RZ motors this weekend for a swap once I round up the needed parts. My question has to do with a 91 V6 truck I have. The motor and transmission was pulled before I got it and thy swapped a 22r in its place. Let’s just say it’s a rats nest and the wiring is horrific. I dont think it ever was even started as I don’t see how it could have in it’s condition. I bought it for parts as it came with another rolling chassis that’s an 84 solid axle.

So onto my question. Is there any issue with pulling the rear end from the 91 and putting it in my 87. My 87 is a 2 pinion 4.1 and my 91 is a 4 pinion 4.56. I would also swap out the needed bits and bobs from the front end to keep the proper gearing. I had also wondered if I could use the rear abs sensor in the pumpkin as the pulse feedback to the 3RZ Ecm. I know the Ecm is looking for a 4 pulse per rev signal I believe but I don’t know if it’s just watching for speed decrees or increase. I’m new this this game but I have had a lot of fun so far. Thanks guys for any help you can provide.

 

The two pinion and four pinion 3rd members will interchange without issue.

As to the ABS signal stuff; I have no clue.