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Old 09-04-2011, 05:38 PM   #1 (permalink)
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14 bolt pinion support bearing

I have a 14 bolt out of a 89 suburban, with 454, I bought a used set of 4.56gears and carrier for it. I bolted the pinion in "as is with the old pinion retainer the 4.56 set came with".

I noticed I can wiggle the pinion a bit, the play seems to be coming from the pinion support bearing area. Do I need to just change the pinion support bearing or is there something else going on??
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Old 09-05-2011, 07:13 AM   #2 (permalink)
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The 89 housing should be the ribbed style. What year are the gears? Are they older (from a smooth housing)?

The smooth vs ribbed housings use different pinion bearings.
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Old 09-05-2011, 10:39 AM   #3 (permalink)
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it's a smooth bottom axle, the year is right at the cut off so it prob got the older style axle. I'm going to pull the pinion retainer and get the info off the ring gear too.
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Old 09-05-2011, 10:51 AM   #4 (permalink)
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If someone had the yoke off, the crush collar could be loose.
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Old 09-05-2011, 11:03 AM   #5 (permalink)
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Picked up a 14 bolt recently that someone had allegedly put a new ring & pinion in. Same problem---loose pinion. Apparently they stopped tightening the pinion nut as soon as contact was made with the crush collar. Maybe they didn't want to distort it?

Doesn't matter though. In the time we've spent speculating, the pinion support could have been pulled and inspected. Odds are the problem will be obvious.
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Old 09-05-2011, 11:24 AM   #6 (permalink)
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Quote:
Originally Posted by nvrenuf View Post
The 89 housing should be the ribbed style. What year are the gears? Are they older (from a smooth housing)?

The smooth vs ribbed housings use different pinion bearings.
Doesn't matter gears are all the same.

I bought a set of gears for my blazer (that had an 81' 14b in it) that I didn't use and installed it in my 01' HD.

The pinion bearing is different but its the pocket of the housing that's different not the ID of the bearing. 14bolt gears interchange from 73'-current.
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Old 09-05-2011, 11:38 AM   #7 (permalink)
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number from the pinion head, 3977336 9 41 gm 10 76

ring gear, gm 3977333 9 41 3 77

does this mean i have a mismatched set? I didn't think to check the numbers!

I clamped the yoke down in the vice and tried to wiggle the retainer. there is a little pop! I.E. slight wiggle.. got to get a 1 1/2" socket

If the set doesn't match then I guess it's time to start over? fawking e-pay!

Last edited by 85-m1028; 09-05-2011 at 11:50 AM.
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Old 09-05-2011, 04:03 PM   #8 (permalink)
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well I went and bought a 1 1/2" socket, stuck it in the vise 3/4" breaker bar with a 4' pipe extender and turned it another prob 1/2 to 3/4 of a turn. pinion bearings still moving with about twice the resistance. "wasn't much to begin with"

No more wiggle! now to see if I can get a good looking pattern. I'm reusing the retainer spacer it came with, which is exactly the same thickness as the original one that came off.

Thanks for the replies
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