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#1 |
Registered User
Join Date: Jun 2002
Location: Fort Worth, TX
Posts: 920
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pinion seal and bearing
the diff on my 72 is leaking from the pinion seal so i know i'm going to need to atleast replace that. question is how do i tell if the actual pinion bearing is bad? I'm wondering if i shouldn't just rebuild the differential. any thoughts?
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#2 |
Registered User
Join Date: Jul 2007
Location: Toppenish, WA
Posts: 15,506
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Re: pinion seal and bearing
You usually get noise if the bearing is bad but a guy may not always hear that running down the road.
It isn't hard to replace the pinion seal though, but for most of us rebuilding the rear end is a job that you call in the professionals for. I'll do almost everything on my trucks myself including engine, trans, body and paint but won't touch a rear end that doesn't have a drop out center section. Last edited by mr48chev; 03-12-2011 at 02:36 PM. |
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#3 |
Registered User
Join Date: Jun 2002
Location: Fort Worth, TX
Posts: 920
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Re: pinion seal and bearing
thanks that's probably good advice. my idea of rebuilding would simply be replacing pinoin bearing and wheel bearing. no i don't hear any noise going down the road. a guy i work with said when you take that flange off you'll be able to tell if the bearing has worn into it some and if so then it needs to be replace. is this true?
i'd much rather just replace the seal at 7$ lol |
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#4 | |
Redefining LowBudget
Join Date: Mar 2009
Location: lebanon Cow Hampshire
Posts: 4,538
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Re: pinion seal and bearing
Quote:
I would also check the vent the mud wasps like them and if it gets hot inside then it will want to push oil out in odd places
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1970 C10 CST fleetside 472 ....big dreams little cash... SunShine Syndicate.. ![]() Mikes Sandwich Fair Run OCT 8th 2011
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#5 |
It's all in the timing
Join Date: May 2009
Location: Lake Mary,Florida
Posts: 600
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Re: pinion seal and bearing
X3,yall have dirt dobbers that far north.
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The Dude Abides. ---------------------- I aint sayin, I'm just sayin. |
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#6 |
Redefining LowBudget
Join Date: Mar 2009
Location: lebanon Cow Hampshire
Posts: 4,538
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Re: pinion seal and bearing
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#7 |
Registered User
Join Date: Oct 2005
Location: Overland Park, Ks.
Posts: 5,216
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Re: pinion seal and bearing
If its not making noises your brgs are probably OK. When you pull the old seal you can remove the frontr brg & examine it. You can pull the rear cover & make sure there is no side to side movement in the carrier brgs. or unusual pieces in the bottom of the houseing. Mark the pinion nut & the shaft before you take it off so you can put it back in the same place. Clean it off & put some locktight on it as the self locking is probably worn out. Put in a new seal & fresh grease & you are good to go. If the pinion flange has a groove in it were the seal rides you can get a speedy sleeve to go over it.
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#8 |
Senior Member
Join Date: Jul 2001
Location: Muskegon,MI,USA
Posts: 6,026
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Re: pinion seal and bearing
When pinion bearings go bad they will make a lot of noise when you let off of the gas. I really doubt if you have bad bearings if you have not heard anything. As mentioned make sure the vent is good and just replace the seal. If the lube looks bad then changing out the gear oil would be recommended.
Jim
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1971 Shortbox step side 4x4, 350 sbc, 3:07 rear end 1965 Impala SS 400 sbc, Muncie rock crusher 1966 Impala SS 396 bbc, TH 400 1969 El Camino, 350 sbc, TH 350 1971 Snowplow built on a Blazer frame 1972 GMC Short bed, stepside, TH 400, 427 BBC |
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#9 |
Born Psycho
![]() Join Date: Feb 2001
Location: brentwood,cal,usa
Posts: 4,881
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trust me, rebuilding rear diff's isn't all that difficult. i used to be scared to death of them but when we got a diff guru at our shop and he taught me the proper way to diagnose, clean and build, it's really not difficult- time consuming sometimes but not difficult- with the proper tools. i have only done semi floaters, chevys, dodges, jeeps and fords so far but one of these days i plan to tackle one of my 14 bolt full floaters.
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jerry moss 72 cheyenne super K20- tilt,tach,vacuum,speedwarning,buckets,shoulder belts,am/fm,tow hooks,bumper guards,toolbox,aux. fuel tank,posi front and rear,plus other goodies!!! SOLD 69 suburban K20-tilt,tach,vacuum,speedwarning,buckets,shoulder belts,am/fm,4 inch all spring lift,4 speed, 14 bolt full floater, dana 44 HD,warn winch,posi front and rear,tow hooks,plus other goodies. 73/80 chevy/gmc K20 SB400,turbo 400,205,tilt,a-c,gas hog. 77 K/5 cheyenne blazer-daily driver/beater. SON HAS IT NOW BRENTWOOD,CALIFORNIA |
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#10 |
Registered User
Join Date: Jun 2002
Location: Fort Worth, TX
Posts: 920
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Re: pinion seal and bearing
thanks for the responses. it turned out there was alot of caked up mud around the vent i cleared away. hopefully that will take care of it if not i feel good about just replacing the seal. thanks again
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#11 |
~Rest In Peace~
Join Date: May 2005
Location: CALIFORNIA NOR CAL
Posts: 9,707
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Re: pinion seal and bearing
proper way to get measure the backlash on the ring and inspect the gears itself,there is a crush sleeve, i would replace that since your replacing the seal too ,but if you rebuild it complete its not that hard some people get intimanded by the shims ,or clutch pac if posi ,if its a one legger (open diff. )my sister can rebuild one of those.
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is it fast ? it has a lighting bolt donut? B___H please, I can remove 90% of your so called "beauty" with a kleenex |
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