Tbolt,
Now that I.think about it, the 88R/V chassis also had tho except for the.C7P 10500 giver C7P chassis set up like my 89. While.the.same hp torque specs, the.power.curve was.enough.different that the 88 K3500 felt more.powerfully than the 89 R3500.
I also do not remember that axle.differences enough on smaller rigs. Other than what I recall from earlier postings. I could not get a locker with a BB in my 88 due.to using a dana70 vs the ff c14 in later models like my 96 k3500.
The tbi and carb versions of.the.4.3, 350 and 454 were way.under powered vs the.vortex.models. Had a 2000 4.3 safari van that felt every.bit as.strong as pre vortec 350s. My.vortex 350 is stronger than 454s mentioned.
Marty