C3 Vette Registry - The Best Resource on the Net for C3 Vettes! C3 Vette
Forums -> C3 Driveline Components
Not Logged In! Login or Register!  Users Online: 11 / Help 
Features  Find C3 Parts on ebay in only 2 or 3 clicks!  | Add YOUR C3 to the Registry

Supporting Vendors
VetteBookStore.com
Volunteer Vette Products
Mid America Motorworks
CorvetteClothing.com
Bair's Corvettes

C3 of the Month
None Current
Enter Yours Today!
Online C3 Show
13
C3s are Registered

Vanity Plates
LOWBROW
Lowbrowser
Featured Links

Buy Now
Corvette by the Numbers
Corvette by the Numbers


Collector's Originality Guide Corvette 1968-1982 (Paperback)
Collector's Originality Guide Corvette 1968-1982 (Paperback)


Corvette Magazine - $19.99 for 8 issues
Corvette Magazine
Only $19.99 for 8 issues


The Corvette Factories: Building America's Sports Car (Hardcover)
The Corvette Factories: Building America's Sports Car (Hardcover)



| Hide Signatures and Profile Pics

 New Topic New Topic Post Reply Reply New Poll New Poll Search     Search Page [1]  
11/15/06 7:32pm - Original Message: 'Expertise please: differential fluid change'
SFVette
Former Member
- Send Private Message


Joined: 3/27/2006
Posts: 380
Time to change the fluid in the differential--and I need the Vetterinarians' expert opinions on which method to use.

The garage nearby says they don't pump the pumpkin out, preferring to remove the case cover and drain it that way. Takes out more of any metal bits that might be in there, they advise. Makes sense to me.

But there's the small matter of access to that cover that concerns me. The spare tire holder and rear spring may pose potential problems (time=$, in plain English; and I don't have much of the latter to spend now).

So which way is better--pumping out or drop 'n drain? Or doesn't it make a whole lotta difference to the differential?

(I already have the GM brand lubricant and positraction additive on hand, either way)
 Reply Reply  Quote Reply w/Quote
 
Support C3VR!
Suport our advertisers
11/15/06 8:07pm - Reply: 'Expertise please: differential fluid change'
ranger3 Lifetime Member
Lifetime Member
- Send Private Message


North Charleston, SC - USA

Vette(s):
1975 L48 AT AC T-top

Joined: 3/20/2004
Posts: 4176
I pump mine out. I got the pump from Boater's World. The kit has several hoses with different diameters. I drove the car to get the fluid hot and less viscous. The pump worked great. I also used the pump to inject the new fluid and additive. Put the additive in first so you use the entire bottle then add the differential fluid..

My 75 had terrible chatter in the posi-clutches. After the fluid change it is as smooth as silk.

Good Luck
Scott


____________________________________

C3VR Lifetime Member #114


 Reply Reply  Quote Reply w/Quote
11/15/06 8:19pm - Reply: 'Expertise please: differential fluid change'
Ron 78 Lifetime Member
Lifetime Member
Moderator
- Send Private Message


BINGHAMTON, NY - USA

Vette(s):


Joined: 7/19/2003
Posts: 3805
I pump mine out,you wont get all of it,just move the hose around and keep suckin ,you'll get most of it.they do sell a plug kit which you can install on the cover,but I would want to take the cover off to install it,so as not to get any more metal in the differential like you said its a lot of work to get it off,you have to drop the spring off too,sometimes when you try to take the spring bolts off,it cracks the cover.do the pump thingThumbs%20Up

____________________________________

C3VR Lifetime Member #93
 
 Reply Reply  Quote Reply w/Quote
11/15/06 9:34pm - Reply: 'Expertise please: differential fluid change'
74stingray454
Former Member
- Send Private Message


Willow Grove, PA - USA

Vette(s):
1974 Stingray Coupe LS4 454 Dark Brown Metallic with Deluxe Saddle interior

Joined: 10/27/2006
Posts: 232
Check harbor freight for nifty little hand pumps... sometimes on sale they are only $4-5 bucks or so....
 
 
 Reply Reply  Quote Reply w/Quote
11/15/06 10:34pm - Reply: 'Expertise please: differential fluid change'
lukesvette Lifetime Member
Lifetime Member
- Send Private Message


HOWELL, NJ - USA

Vette(s):
1979, Targa Blue (72 Color), Pace Car rear spoiler, L88 hood, Dark blue factory interior, 525HP 406, HD 700R4, 370 gears,Steeroids, composite rear spring, TT IIs wrapped in T/A Radials.

Joined: 5/18/2004
Posts: 6807
If the rear is not leaking, making any whining, chattering or clunking noises, pumping the gear oil out is fine. Make sure you use GM Positraction Additive when you refill. A cheap and worthwhile investment is also replacing the plastic vent cap on the top of th cover!! A few second worth of work.
 
Have fun!!
 
Paul
LukesVette2006-11-15 19:36:43

____________________________________
LukesVette Homepage
Veteran of Operation Iraqi Freedom
101st Airborne(AirAssault!)
God Bless America

Support Our Troops


     
 Reply Reply  Quote Reply w/Quote
11/15/06 10:52pm - Reply: 'Expertise please: differential fluid change'
Adams' Apple Lifetime Member
Lifetime Member
Moderator
- Send Private Message


Duncanville, TX - USA

Vette(s):
#1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/ Am-Fm/map light National/Regional/Chapter NCRS "Top Flight" #2-1985 Bright Red/Carmine Cp.L-98/auto Member: NCRS, NCRS Texas, Corvette Legends of Texas

Joined: 11/8/2003
Posts: 19523
I'm wid ya'll!! Iffin it ain't makin no noise, or chatterin when ya turns da corners, jest pump it!! It will be mooch easier to do this if it is hot, like Scott said. The gear lube will be thinner, and easier to pump out.
Also, when pumping in the new lube, put the bottles in a bucket of hot water for a long time before putting it in...this will make it easier to pump the stuff back in. Put the posi additive in first, as was also mentioned.

____________________________________
Joel Adams
C3VR Lifetime Member #56    
My Link


(click for Texas-sized view!)
             NCRS

"Money can't buy happiness -- but somehow it's more comforting to cry in a CORVETTE than in a Kia"
 Reply Reply  Quote Reply w/Quote
11/15/06 11:55pm - Reply: 'Expertise please: differential fluid change'
mkapp7879
Former Member
- Send Private Message


Joined: 10/21/2003
Posts: 1220

I've pumped mine. Use the biggest hose that will work with the pump. I was able to get a good siphon working and just walked away from it for a couple of hours. Came back to find most of the fluid removed, enough to satisfy me. Poured it into an empty milk jug to see how much I had. At least 1 1/2 qts.

Filling it I was able to just use the squeeze bottle. Squeezed a little in and then added the posi lube to the bottle. Finished up as much as I could of the first bottle then poured what I could of the second bottle into the first to make sure all the posi lube got in. Kept adding to the first bottle til I got it all in.   Mike



____________________________________
 Reply Reply  Quote Reply w/Quote
12/11/13 1:18pm - Reply: 'Re: Expertise please: differential fluid change'
JohnRR
Standard Member
- Send Private Message


Joined: 2/22/2011
Posts: 110
I'm always looking for ways to improve the whole car.  That big, ugly metal spring weighs 34 lbs.  I would remove the spring, and replace it with a light weight fiberglass unit, or coil-overs.  While you're doing that, remove the diff. cover and clean everything out.  

Just my .02
John


____________________________________
1973 BB 4-Speed Coupe Project Car
2009 Z06 Mostly Stock
 Reply Reply  Quote Reply w/Quote
12/11/13 1:21pm - Reply: 'Re: Expertise please: differential fluid change'
JohnRR
Standard Member
- Send Private Message


Joined: 2/22/2011
Posts: 110
I just realized that I've been scammed by the forum's computer.  It posted this post as a pop-up on my screen and I thought it was new.   Oh well, now I know.... LOL

____________________________________
1973 BB 4-Speed Coupe Project Car
2009 Z06 Mostly Stock
 Reply Reply  Quote Reply w/Quote
12/11/13 2:03pm - Reply: 'Re: Expertise please: differential fluid change'
Adams' Apple Lifetime Member
Lifetime Member
Moderator
- Send Private Message


Duncanville, TX - USA

Vette(s):
#1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/ Am-Fm/map light National/Regional/Chapter NCRS "Top Flight" #2-1985 Bright Red/Carmine Cp.L-98/auto Member: NCRS, NCRS Texas, Corvette Legends of Texas

Joined: 11/8/2003
Posts: 19523
JohnRR said: I just realized that I've been scammed by the forum's computer.  It posted this post as a pop-up on my screen and I thought it was new.   Oh well, now I know.... LOL


LOL
Not yer puter doin that...it's the new stuff Adam has added, at the bottoms of the pages. I've fallen for it a couple of times myself....LOL

I was wondering why you were pulling up such an old thread...Tongue


____________________________________
Joel Adams
C3VR Lifetime Member #56    
My Link


(click for Texas-sized view!)
             NCRS

"Money can't buy happiness -- but somehow it's more comforting to cry in a CORVETTE than in a Kia"
 Reply Reply  Quote Reply w/Quote
 New Topic New Topic Post Reply Reply New Poll New Poll Search     Search Page [1]  
 Forums -> C3 Driveline Components
(Moderator: Adam Wartell, Norsky, Adams' Apple)
 

 
Official C3 Vette Registry Community:
Home | Forums | Email | Who's Online | Clubs | Events | Member Stats

Other Official C3 Vette Registry Areas:
Members | Research | Shop | My Account | About C3VR
 

Corvette is a registered trademark of the General Motors Corporation(GM) & Chevrolet Motor Division. Vette Registries, LLC is responsible for all site content (except for member submitted content or where otherwise noted) and does not claim or imply that Chevrolet or GM is responsible for Official C3 Vette Registry content. Vette Registries, LLC is independent from GM and is not affiliated with, sponsored or supported by GM.  Copyright/trademark/sales mark infringements are not intended, or implied and are in fact used to support GM, Chevrolet and Corvette

Official C3 Vette Registry content is Copyright 2001-2018, Vette Registries, LLC. Content may not be reused without written consent. All Rights Reserved. NS

Corvette (Vette) Model Years on this site: 1968 1969 1970 1971 1972 1973 1974 1975 1976 1977 1978 1979 1980 1981 1982 30