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This 4.3 V6 is just a 350 V8 with 2 cylinders missing and even a V8 trans will fit/interchange physically being the same bolt pattern and size. If it's the same shift pattern and both transmissions are overdrive transmissions, yes, it will interchange. If it's GM, it'll swap. From 1988 the automatic transmissions have a multi bolt pattern and Pontiac, Caddy, Olds and Chevy, all will bolt up.
I suspect the computer controls/monitors the auto transmission. I'm not sure the program is universal so you probably have to swap that too. Other than that. The torque converter, bell housing, drive shaft length, shifter linkage would all be issues to look at.
There were changes made to that transmission in 1994 so the answer would be no. It is also my understnding that both were used in 94 so you have to be careful there as well. If I remember correctly there should be a letter or maybe number cast into the case where the torque converter fits.I think you will find it at about the 10 o'clock position. If your trans has it you have to put that style back in. If it doesn't you can't use it. Hope this helps.
the 2 wd and 4wd transmissions are not interchangeable. 95 - 2000 should be the same, 89 - 94 should be the same. check for an ID number on the trans pan, the newer ones should be 4L60E, the older ones could be 4L60 or 200R4. good luck!
I'am assuming its an automatic, in any case the transmission has to come out, after thats done, slip torq converter out of trans, replace the pump seal and reinstall converter into trans, and reinstall trans. back into truck.
It's not worth doing all that conversion, buy the time you spend the time and money to convert the 89 4.3 to work on the 98 blazer, it would be cheaper to install a 98 vortec rebuild. The 89 4.3 have a TBI fuel injection system and the ecm on the 98 will not work and the bad news is that the ecm on the 98 also controls the transmission shift points and the 89 will not, so even if you swap the ecm to have the 89 4.3 engine work. the transmission will not shift.
Sorry for the bad news but it would be cheaper to replace the 98 engine with the years of 1996 to 2001. Good luck and hope this helps.
The best publication out is printed especially for this its the HOLLANDERS INTERCHANGE BOOK this is the bood and program wrecking yards use to know which parts fit which cars and for how many years.
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