Leak at Differential and Driveshaft - The 1947 - Present Chevrolet & GMC Truck Message Board Network

nroden · 04-13-2002, 12:21 AM

I have my truck on concrete for about 4 months now so I am finally able to tell where my leaks are. Looks like it has just leaked a TINY bit under the truck where the driveshaft goes to the differential. What should I do about this? Is this serious enough to fix? I am assuming it is. What should I do?
Thanks guys

------------------
Nick Rodenberg
Wellington, MO
http://nickrod.port5.com
You can click on "My 72 Chevy Truck"
I have a 72 Cheyenne 10 with a V8 350 and a TH-350 auto-tranny.
White/Ochre/White
Runs well... working on body.
Hoping to have completed in March when I turn 16

O'l Buck · 04-13-2002, 12:41 AM

The pinion shaft seal is probably going. It's not too bad to replace if the pinion nut and flange come off decent, you may have to get a speedy sleeve for the flange if it's worn, and use either a big socket or a seal driver to put in the new seal, speedy sleeves come with their own installation tool, looks kinda like a tuna can. If it's not leaking too bad, I wouldn't worry about it, just make sure to keep the rearend full of oil. Eventually, though, it's going to need replaced.

------------------
Ol' Buck: '72 Chevy 1/2T 4x4 shortbox stepside 350/350auto on '84
ralleys and 31/10.5s

Angel girl: 67 Cutlass convertible
330, 3spd stick

Greener: 90 GMC Jimmy
350/auto
Chad Stephens
Orleans,NE

no name yet: 72 442 under serious construction

nroden · 04-13-2002, 12:47 AM

So far truck hasn't leaked motor oil. Still haven't gotten the tranny to completely stop leaking. Keep on finding more tranny leaks. I think I just need to drain it again and get a new gasket. I did it during the summer on the ground and didn't have much room. Now its on concrete and I can have it up higher. I have improved my working conditions 200%. Any other comments?

"I Love my baby... cause she doesn't dance..."

------------------
Nick Rodenberg
Wellington, MO
http://nickrod.port5.com
You can click on "My 72 Chevy Truck"
I have a 72 Cheyenne 10 with a V8 350 and a TH-350 auto-tranny.
White/Ochre/White
Runs well... working on body.
Hoping to have completed in March when I turn 16

busterwivell · 04-13-2002, 01:15 AM

I've had vehicles that I used infrequently and had a small leak at the diff. I found that by driving it every couple of weeks, I didn't have a leak any more. I've been told by my tranny guy that, when our GM cars sit for extended periods, the converters unload, and the fluid level in the trans goes up. He says the little gasket where the linkage goes in will cause a leak. I've had this problem with a TH350, a 2004R and a 700R4. Each time, it was a quick, cheap fix. When You finnd a leak by the linkage, this will probably be the problem.

nroden · 04-13-2002, 08:28 AM

Any else heard of busterwivell's theory?

------------------
Nick Rodenberg
Wellington, MO
http://nickrod.port5.com
You can click on "My 72 Chevy Truck"
I have a 72 Cheyenne 10 with a V8 350 and a TH-350 auto-tranny.
White/Ochre/White
Runs well... working on body.
Hoping to have completed in March when I turn 16

**Desert Rat** · 04-13-2002, 09:46 AM

My pinion seal has leaked since i got the truck let me think about 4-5 years ago,it sprays all over under the bed,and exhaust,once in a while i pressure wash it off,ocassionally i crawl under there and pump some fluid in it,but it never takes as much as id suspect from the mess it makes.my steering box leaks,rear main seal,no tranny drips thank god.Cant wait to put that 454 in there all new seals so hopefully no leaks,pinion seal im taking into have done on a rack,ive pulled the pinion yoke off before under a truck=not fun.then you got to tighten the crap outta it because of the crush seal,mines going to a diff shop and they can do it.I hate anything to do with gear oil.

chevy_72 · 04-13-2002, 05:27 PM

i guess im alittle cheaper because any leak i ever have in anyhting like those types of things, if i can i put laittle brake fluid in and it pumps through with the other fluid and its swells up those seals and all and it stops the leak. hey its a good cheap way and it wont tear anything up alot of people i know do it. so try that its a cheap way to find out if it works.

chevy_72 · 04-13-2002, 05:27 PM

i guess im alittle cheaper because any leak i ever have in anyhting like those types of things, if i can i put laittle brake fluid in and it pumps through with the other fluid and its swells up those seals and all and it stops the leak. hey its a good cheap way and it wont tear anything up alot of people i know do it. so try that its a cheap way to find out if it works.

04-13-2002, 12:21 AM	#1
nroden Registered User Join Date: Jun 2001 Location: Springfield, MO Posts: 1,098	Leak at Differential and Driveshaft I have my truck on concrete for about 4 months now so I am finally able to tell where my leaks are. Looks like it has just leaked a TINY bit under the truck where the driveshaft goes to the differential. What should I do about this? Is this serious enough to fix? I am assuming it is. What should I do? Thanks guys ------------------ Nick Rodenberg Wellington, MO http://nickrod.port5.com You can click on "My 72 Chevy Truck" I have a 72 Cheyenne 10 with a V8 350 and a TH-350 auto-tranny. White/Ochre/White Runs well... working on body. Hoping to have completed in March when I turn 16 __________________ Nick Rodenberg 72 Cheyenne 10 V8 350/TH350 white/ochre/white/ochre, ochre/saddle interior Retired and in the dry... still runs. I now drive Red '01 Ford Focus... better MPG!!!

04-13-2002, 12:41 AM	#2
O'l Buck Recovering Truck Driver Join Date: Mar 2002 Location: Orleans, NE USA Posts: 1,883	The pinion shaft seal is probably going. It's not too bad to replace if the pinion nut and flange come off decent, you may have to get a speedy sleeve for the flange if it's worn, and use either a big socket or a seal driver to put in the new seal, speedy sleeves come with their own installation tool, looks kinda like a tuna can. If it's not leaking too bad, I wouldn't worry about it, just make sure to keep the rearend full of oil. Eventually, though, it's going to need replaced. ------------------ Ol' Buck: '72 Chevy 1/2T 4x4 shortbox stepside 350/350auto on '84 ralleys and 31/10.5s Angel girl: 67 Cutlass convertible 330, 3spd stick Greener: 90 GMC Jimmy 350/auto Chad Stephens Orleans,NE no name yet: 72 442 under serious construction __________________ 67 K-20 350, SM465, Eaton rear, 4.56 no spin option 00 Dodge 2500 4x4, 24V cummins, 5 speed Chad South Central Nebraska

04-13-2002, 12:47 AM	#3
nroden Registered User Join Date: Jun 2001 Location: Springfield, MO Posts: 1,098	So far truck hasn't leaked motor oil. Still haven't gotten the tranny to completely stop leaking. Keep on finding more tranny leaks. I think I just need to drain it again and get a new gasket. I did it during the summer on the ground and didn't have much room. Now its on concrete and I can have it up higher. I have improved my working conditions 200%. Any other comments? "I Love my baby... cause she doesn't dance..." ------------------ Nick Rodenberg Wellington, MO http://nickrod.port5.com You can click on "My 72 Chevy Truck" I have a 72 Cheyenne 10 with a V8 350 and a TH-350 auto-tranny. White/Ochre/White Runs well... working on body. Hoping to have completed in March when I turn 16 __________________ Nick Rodenberg 72 Cheyenne 10 V8 350/TH350 white/ochre/white/ochre, ochre/saddle interior Retired and in the dry... still runs. I now drive Red '01 Ford Focus... better MPG!!!

04-13-2002, 01:15 AM	#4
busterwivell Registered User Join Date: Jan 2002 Location: Sahuarita, AZ USA Posts: 2,033	I've had vehicles that I used infrequently and had a small leak at the diff. I found that by driving it every couple of weeks, I didn't have a leak any more. I've been told by my tranny guy that, when our GM cars sit for extended periods, the converters unload, and the fluid level in the trans goes up. He says the little gasket where the linkage goes in will cause a leak. I've had this problem with a TH350, a 2004R and a 700R4. Each time, it was a quick, cheap fix. When You finnd a leak by the linkage, this will probably be the problem. __________________ Bill - Tucson, AZ 47 Chevrolet 2 dr sedan 56 Chevrolet 210 2 dr sedan 66 Chevrolet Malibu 2 dr 4 speed 71 Chevrolet C30 Longhorn 86 Chevrolet Monte Carlo SS (Sold) 01 Chevrolet Tahoe IM - BUSTERWIVE@aol.com

04-13-2002, 08:28 AM	#5
nroden Registered User Join Date: Jun 2001 Location: Springfield, MO Posts: 1,098	Any else heard of busterwivell's theory? ------------------ Nick Rodenberg Wellington, MO http://nickrod.port5.com You can click on "My 72 Chevy Truck" I have a 72 Cheyenne 10 with a V8 350 and a TH-350 auto-tranny. White/Ochre/White Runs well... working on body. Hoping to have completed in March when I turn 16 __________________ Nick Rodenberg 72 Cheyenne 10 V8 350/TH350 white/ochre/white/ochre, ochre/saddle interior Retired and in the dry... still runs. I now drive Red '01 Ford Focus... better MPG!!!

04-13-2002, 09:46 AM	#6
Desert Rat Senior Member Join Date: Dec 1999 Location: Darrington, Washington Posts: 3,963	My pinion seal has leaked since i got the truck let me think about 4-5 years ago,it sprays all over under the bed,and exhaust,once in a while i pressure wash it off,ocassionally i crawl under there and pump some fluid in it,but it never takes as much as id suspect from the mess it makes.my steering box leaks,rear main seal,no tranny drips thank god.Cant wait to put that 454 in there all new seals so hopefully no leaks,pinion seal im taking into have done on a rack,ive pulled the pinion yoke off before under a truck=not fun.then you got to tighten the crap outta it because of the crush seal,mines going to a diff shop and they can do it.I hate anything to do with gear oil.

04-13-2002, 05:27 PM	#7
chevy_72 Registered User Join Date: Mar 2002 Location: missouri Posts: 60	i guess im alittle cheaper because any leak i ever have in anyhting like those types of things, if i can i put laittle brake fluid in and it pumps through with the other fluid and its swells up those seals and all and it stops the leak. hey its a good cheap way and it wont tear anything up alot of people i know do it. so try that its a cheap way to find out if it works.



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