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Freakin Unreal!!!


Camino LS6

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As you guys know, I'm replacing the rear in the '92 Blazer.

The trouble is that it is a G80 locking rear and the debate over synthetic/dino oil and additive/no addititve is all over the place.

After reading a zillion different forums, and talking to my friend at the Chevy place, I am no closer to a definitive answer on this.

G80 is a build code RPO and seems to mean different things in different years and on different vehicles.

So I need a definitive answer on a '97 Tahoe G80 (the donor car my new rear is from).

Anyone have a manual for that year?

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TSB 76-02-02A from Oct. '98 has a rear diff fluid chart, part of it states:

(After listing the F, Y, B/D, and GMT800 platforms)

"All other limited slip or locking differentials including C/K (non-GMT 800), S/T, M/L, G trucks: Use Only GM P/N: 1052271. (Do NOT add Limited Slip Additive)"

FYI, The GMT800 also does not call for the additive, just lists the P/N 12378261 75w-90 Synthetic Axle Lubricant instead of the P/N 1052271 80w-90.

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I would change the gear oil in the front diff & transfer case if it uses it or the proper ATF . Just my certified :twocents: fwiw. They all have seen the same mileage & abuse plus the big BANG. Lets get the debris out of the units.

That thought has crossed my mind.

Even so, the front diff has only seen a tiny percentage of the use the rear has.

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I take that it's a part-time unit then

Most definitely, full-time 4wd was never a good idea. It wore parts terribly and killed fuel economy, only a dedicated AWD system works well enough in those categories to be viable. The domestics toyed with full-time 4WD in the 70s, and it was a real loser - many of those vehicles were converted to part-time.

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