Pulled my rear diff. cover tonight - The 1947 - Present Chevrolet & GMC Truck Message Board Network

69_hafton · 05-29-2003, 12:09 AM

Removed the rear differential cover to check things out tonight.

The ring gear read
381903 9.37 GM 3-69 2

37 divided by 9 = 4.11

This is behind a 292, 4 speed & 1 pc. driveshaft with "4x4 tires". Tires are 31 x 10.50 R 15 LT's which has to be throwing the speedometer off. (I'm guessing) What tire is closest to original on the 2WD 1/2 tons? Also, is this a posi?

Gears have some pitting, so I may be in for replacing them

69_hafton · 05-29-2003, 12:13 AM

Do photos get compressed on here?

One more time...

jtnixon · 05-29-2003, 12:18 AM

Does appear to be an Eaton posi

FRENCHBLUE72 · 05-29-2003, 12:19 AM

The 2nd pic look's to be a posi or limited slip of some sort.

69_hafton · 05-29-2003, 12:40 AM

Thanks for the replies, I'll take new photos and see if they get chewed up when post. I can barely see anything on these.

Any comments on wheel & tire size are welcome.

ZOOMY · 05-29-2003, 01:28 AM

Pitting on the gears won't hurt as long as it's not howling too loud. Pitting on the bearings is bad news.......Zoomy

Number98 · 05-29-2003, 09:41 AM

Just for future reference, jack the rearend up and you can spin one of the axles forward, if the other side turns forward too then you have a posi. Thats just an easy way to tell if your not sure.

Jason

NSANE68!!! · 05-29-2003, 02:33 PM

Not true. I had a factory posi in my 72 and if you spun it forward the other would go oppisite. I was told this was a GOV lock posi that is factory and not all that great, so when I blew the spider gears in a million pieces

I put in a new Auburn posi and 4:11's. Now when you spin it forward then the other spins forward a TRUE posi.

Number98 · 05-29-2003, 02:41 PM

So your saying a true posi spins both forward huh...... how about that........

crazy longhorn · 05-29-2003, 04:07 PM

yup, thats an eaton unit. I agree with ZOOMY......the pitting on the gears wont hurt you ,as long as they arent howling. By the looks, it probably wouldnt hurt to have a look at & or replace bearings tho. good luck, crazyL

69_hafton · 05-29-2003, 11:19 PM

Thanks All for the comments, I guess there may be a better test for a posi - involving high rpms and a lot of smoke

I think I'll go with your recommendation CrazyL after some more looking at the steps in bearing replacement. I had some noise in the driveline somewhere and planned on just the u-joints.

Bearings are cheap in the 1/2 ton, but how many tools will I have to buy to redo them?

I really appreciate the comments on the pitted ring & pinion gears, that will save me $250 for now...

05-29-2003, 12:09 AM	#1
69_hafton Sleep-Deprived Join Date: Sep 2002 Location: Tulsa, Oklahoma Posts: 445	Pulled my rear diff. cover tonight Removed the rear differential cover to check things out tonight. The ring gear read 381903 9.37 GM 3-69 2 37 divided by 9 = 4.11 This is behind a 292, 4 speed & 1 pc. driveshaft with "4x4 tires". Tires are 31 x 10.50 R 15 LT's which has to be throwing the speedometer off. (I'm guessing) What tire is closest to original on the 2WD 1/2 tons? Also, is this a posi? Gears have some pitting, so I may be in for replacing them Attached Images

05-29-2003, 12:13 AM	#2
69_hafton Sleep-Deprived Join Date: Sep 2002 Location: Tulsa, Oklahoma Posts: 445	ouch, what happened to the pic Do photos get compressed on here? One more time... Attached Images

05-29-2003, 12:19 AM	#4
FRENCHBLUE72 PROJECT 7DEUCE Join Date: Dec 2002 Location: GRANTS PASS OR Posts: 21,608	The 2nd pic look's to be a posi or limited slip of some sort. __________________ GO BIG GREEN GO DUCKS MEMBER #6377 72 k-5 daily driver 6'' lift 35'' 350-350-205 slowly getting rust free. Project "7DEUCE" check out my build http://67-72chevytrucks.com/vboard/s...d.php?t=267665 Tim Powell..R.I.P EastSideLowlife..... R.I.P..

05-29-2003, 12:40 AM	#5
69_hafton Sleep-Deprived Join Date: Sep 2002 Location: Tulsa, Oklahoma Posts: 445	I'll try to get another shot tomorrow nite Thanks for the replies, I'll take new photos and see if they get chewed up when post. I can barely see anything on these. Any comments on wheel & tire size are welcome.

05-29-2003, 01:28 AM	#6
ZOOMY Senior Member Join Date: Feb 2003 Location: WIS Posts: 1,752	pitting Pitting on the gears won't hurt as long as it's not howling too loud. Pitting on the bearings is bad news.......Zoomy

05-29-2003, 12:18 AM	#3
jtnixon Registered User Join Date: Feb 2003 Location: Montana Posts: 7	Does appear to be an Eaton posi

05-29-2003, 09:41 AM	#7
Number98 Prestige Worldwide Join Date: Feb 2001 Location: Worldwide Posts: 2,553	Just for future reference, jack the rearend up and you can spin one of the axles forward, if the other side turns forward too then you have a posi. Thats just an easy way to tell if your not sure. Jason

05-29-2003, 02:33 PM	#8
NSANE68!!! SLICER AND DICIER Join Date: May 2001 Location: Quuen Creek Posts: 1,383	Not true. I had a factory posi in my 72 and if you spun it forward the other would go oppisite. I was told this was a GOV lock posi that is factory and not all that great, so when I blew the spider gears in a million pieces I put in a new Auburn posi and 4:11's. Now when you spin it forward then the other spins forward a TRUE posi. __________________ 01 Tahoe 22's 2/4 drop and tv's 68 chevy money pit 51 chevy belair 95 Honda 900RR 05 GMC Siearra (company truck)

05-29-2003, 02:41 PM	#9
Number98 Prestige Worldwide Join Date: Feb 2001 Location: Worldwide Posts: 2,553	So your saying a true posi spins both forward huh...... how about that........

05-29-2003, 04:07 PM	#10
crazy longhorn Fabricate till you "puke" Join Date: Jun 2002 Location: Ill Posts: 9,402	yup, thats an eaton unit. I agree with ZOOMY......the pitting on the gears wont hurt you ,as long as they arent howling. By the looks, it probably wouldnt hurt to have a look at & or replace bearings tho. good luck, crazyL __________________ 69 longhorn,4" chop,3/5 drop, 1/2 ton suspension/disc brakes,1 1/2" body drop,steel tilt clip, 5.3/Edelbrock rpm intake/600 carb, Hooker streetrod shorties,2 1/2" exhaust/ H pipe/50's Flows , 6 spd Richmond trans,12 bolt/ 3.40 gears....

05-29-2003, 11:19 PM	#11
69_hafton Sleep-Deprived Join Date: Sep 2002 Location: Tulsa, Oklahoma Posts: 445	Thanks All for the comments, I guess there may be a better test for a posi - involving high rpms and a lot of smoke I think I'll go with your recommendation CrazyL after some more looking at the steps in bearing replacement. I had some noise in the driveline somewhere and planned on just the u-joints. Bearings are cheap in the 1/2 ton, but how many tools will I have to buy to redo them? I really appreciate the comments on the pitted ring & pinion gears, that will save me $250 for now...

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