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Old 02-04-2005, 05:46 PM
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Ford 8.8 experts help! Did I get ripped off?

Bought a set of lo miles used 3:55's to replace my 3:27's.
Rear end needed rebuilt anyway, LOTS of miles, howling.

Used the pinion depth method of matching the new pinion
head thickness plus assembled new bearing plus shims to the old
pinion head thickness plus assembled old bearing plus the
existing shims.

Got everything cleaned up, the new pinion installed to correct
rotational torque, so far so good.

THEN tried to set the carrier in place. Nope!
My factory service manual says to put a .265" shim on each side
of the carrier, then measure backlash, then adjust.

The old carrier had a .265 on one side and a .275 on the other.
Believe it was original.

Bought Ford gears and the same brand bearings as what
Ford used originally.

Should be a piece of cake, right? WRONG!

Even with NO shim on the left side, the carrier won't fit
down all the way so the carrier bearing seats all the way
into the housing.

Studied the situation. The ring gear has "Ford" on it, along
with "355". The 355 ring gear is thicker than the 3:27 by
a little, as it should be.

The 355 ring gear has 39 teeth to 11 on the pinion.
The 327 ring gear has 37 teeth to 11 on the pinion,
and a slightly wider/bigger pitch between teeth.
As it should be.

Looking at it, the 355 ring gear is a little thicker, again as it should be.
Then, looking at the pinion, it has exactly the same diameter
as the 327 pinion and the same pitch on the teeth. Hmmm.
With a thicker ring gear, the pinion should be smaller in diameter, not?
Seems that's the reason the carrier & ring gear won't go all the
way in, even without shims?

Also noticed the original 327 pinion has a Ford part # stamped in
the end. The 355 pinion has no part #'s stamped on the end.

Although the 355 pinion has the right # of teeth, the pitch should
be a little smaller as well as the overall diameter to work with the
thicker ring gear, or am I hallucinating?

I checked and the pinion inside bearing race IS fully seated, so that
isn't holding the pinion out further.

I can't think of anything else.

Thanks for any info, although I don't think I'm going to like the
answer!
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Old 02-06-2005, 02:15 AM
M&M CUSTOM's Avatar
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I'm not sure of the 8.8, so I don't know the answer off the top of my head.

Did you buy the 3.55's with the carrier, or re-use the 3.27 carrier?

As I am unsure of the gear ratio carrier breaks for the 8.8, I do not know if you are in need of a different carrier for those two ratios.

If indeed there is a need for the carrier to be replaced with the thickness difference of the 3.55's you will end up having to spring for a carrier too.
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Old 02-06-2005, 06:38 AM
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I'm OK

Yes, I looked into that first.

I forget exactly where, but it's some
lower, if I recall correctly.

Besides, I bought the carrier WITH the
gears because it had only 10k miles and
I got it cheaper than a trac loc rebuild kit.

Turns out it was the same part # as
the 327 carrier.

Of course, with the gears being suspect, there's no telling the truth of the carrier info either!

Thanks for the input though!
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Old 02-07-2005, 12:05 PM
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All ring & pinion gears are run in together. They are then numbered with a three digit (usually) identifier that should be found on the side of the ring ear and head of the pinion. If the ink numbers don't match, so sorry.
3.27 & 3.55 carriers are the same. Sounds like mismatched gearset.
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