changing manual tranny oil - The 1947 - Present Chevrolet & GMC Truck Message Board Network

jay55jay · 04-14-2010, 08:07 PM

I was looking at the tranny today and I am wondering how to check and change the oil. I see the bottom plug I could not see another one.

Slofarmtruck · 04-14-2010, 08:26 PM

Might only be one plug on it which would require you to suck out the old fluid with a pump and fill with new fluid up to that hole.

Hoods69BadBowTie · 04-14-2010, 10:20 PM

If theres a plug on the bottom of it has to be one on the top cause can't fill it other wise. If theres only 1 plug will be on top. What are you working on?

jay55jay · 04-15-2010, 07:30 AM

It's a 87 chevy c 10 with a 4 speed I have never checked the fluid in it or the rear do they both take the same gear oil?

James McClure · 04-15-2010, 10:15 AM

Same oil?? Mabey, mabey not. Is it a 465? (big cast iron case with a granny low gear) If it is use the same lube (80W 90) in trans and rear end(s). If not it will use ATF. Transfer cases (aluminum) use ATF. Heavy cast iron transfer cases use (80W 90) ALL differentials use 80W 90. The 465 has 2 plugs both on the left side, one high on the case and one at the bottom. Drain lube, replace pulg and fill until runs out the upper plug, about 4 quarts should do it. Jim

jay55jay · 04-15-2010, 11:00 AM

Yes it's the granny tranny big square box it has a plug dead center on the bottom in the middle I didn't see any other plug

fpjr0 · 04-15-2010, 07:04 PM

I used to work in a lube center for years, just dont remember,,, the plug at the bottom is the drain and their has to be another plug the same size on either side, just can remember..

jay55jay · 04-15-2010, 08:03 PM

I have to look at it better. So I have not really taken it out on the highway yet. What do the granny trannies typically cruise at. I have a 350 in the truck

donut · 04-16-2010, 05:04 AM

There's no OD, so rpm would depend on your rear gears and tire size.

GmtGmt · 04-16-2010, 09:20 AM

There are 2 Plugs on a SM465.

i use 75W90 Mobile Lube

Oilbrnr · 04-16-2010, 07:36 PM

Look closer, there is a fill plug on the side. IIRC it is on the passenger side, though the pic above would contradict that...

None the less, it is there.

jay55jay · 04-16-2010, 07:45 PM

I found the plug half way up on the drivers side. About how much gear oil should i buy for it off hand.

Oilbrnr · 04-16-2010, 08:01 PM

half gallon. Better to have to much and return one than being short in the middle of the job. It is enough of a PITA that you want to get'r done in one shot! I hate the smell of hypoid oil!!!

04-14-2010, 08:07 PM	#1
jay55jay Registered User Join Date: Mar 2010 Location: bayville,nj Posts: 165	changing manual tranny oil I was looking at the tranny today and I am wondering how to check and change the oil. I see the bottom plug I could not see another one.

04-14-2010, 08:26 PM	#2
Slofarmtruck Registered User Join Date: Feb 2010 Location: Waukesha, WI Posts: 162	Re: changing manual tranny oil Might only be one plug on it which would require you to suck out the old fluid with a pump and fill with new fluid up to that hole.

04-14-2010, 10:20 PM	#3
Hoods69BadBowTie Chevys Kick A$$ Join Date: Jan 2005 Location: Zootown, MT Posts: 12,699	Re: changing manual tranny oil If theres a plug on the bottom of it has to be one on the top cause can't fill it other wise. If theres only 1 plug will be on top. What are you working on? __________________ HOODS is what I answer too -'79, '77, '88 Pickup Sold, '85 Camaro, '83 T/A, '81,'83,'90 K5 Blazer All Sold -'79 3/4 ton "Big Yellow Bananna" Lifted 4spd. 39.5 TSL Swampers, The money Pit -'86 K5 Blazer Silverado 6.2 4" lift 35"s -'95 Ext. Cab Shorty 4" Tuff Country rolling 35" M/T's -'83 Monte Carlo T-Tops. 126,500 Original Miles -LATER I would rather push a Chevy then drive a ford!!

04-15-2010, 07:30 AM	#4
jay55jay Registered User Join Date: Mar 2010 Location: bayville,nj Posts: 165	Re: changing manual tranny oil It's a 87 chevy c 10 with a 4 speed I have never checked the fluid in it or the rear do they both take the same gear oil?

04-15-2010, 10:15 AM	#5
James McClure One shot, one kill. Join Date: Dec 2007 Location: Saratoga Springs NY Posts: 859	Re: changing manual tranny oil Same oil?? Mabey, mabey not. Is it a 465? (big cast iron case with a granny low gear) If it is use the same lube (80W 90) in trans and rear end(s). If not it will use ATF. Transfer cases (aluminum) use ATF. Heavy cast iron transfer cases use (80W 90) ALL differentials use 80W 90. The 465 has 2 plugs both on the left side, one high on the case and one at the bottom. Drain lube, replace pulg and fill until runs out the upper plug, about 4 quarts should do it. Jim __________________ 1984 K20 350M engine with 465,000 miles. Well, it's finally done!! Almost 2 years of work, but it was really worth the effort. Little stuff left to do is mount winch, wet sand & buff out and build belly pan\running boards. Body work takes lots and LOTS of beer!!!! God, Guts and Guns made America and God, Guts and Guns will preserve it! The worst thing you could do is get into my sights, but that don't matter, you'll never know it, cause you'll never hear the shotJim or Paladin whichever you choose.

04-15-2010, 11:00 AM	#6
jay55jay Registered User Join Date: Mar 2010 Location: bayville,nj Posts: 165	Re: changing manual tranny oil Yes it's the granny tranny big square box it has a plug dead center on the bottom in the middle I didn't see any other plug

04-15-2010, 07:04 PM	#7
fpjr0 Registered User Join Date: Mar 2009 Location: san antonio tx Posts: 202	Re: changing manual tranny oil I used to work in a lube center for years, just dont remember,,, the plug at the bottom is the drain and their has to be another plug the same size on either side, just can remember.. __________________ ONCE YOU GO LS, YOU NEVER WANT LESS!!

04-15-2010, 08:03 PM	#8
jay55jay Registered User Join Date: Mar 2010 Location: bayville,nj Posts: 165	Re: changing manual tranny oil I have to look at it better. So I have not really taken it out on the highway yet. What do the granny trannies typically cruise at. I have a 350 in the truck

04-16-2010, 05:04 AM	#9
donut Registered User Join Date: Aug 2009 Location: S.C. Posts: 1,593	Re: changing manual tranny oil There's no OD, so rpm would depend on your rear gears and tire size. __________________ '86 C-30 dually, 454/tbh400 '73 K-20 350/350/205 (sold ) I'm kinda like duct tape- no real purpose, but handy to have around.

04-16-2010, 07:36 PM	#11
Oilbrnr Registered User Join Date: Feb 2009 Location: Scottsdale, AZ Posts: 390	Re: changing manual tranny oil Look closer, there is a fill plug on the side. IIRC it is on the passenger side, though the pic above would contradict that... None the less, it is there. __________________ -Don- '66 C10 w/factory A/C '77 Cheyenne K5 350/465/205 '80 Custom Deluxe K20 350/465/205 '04 Denali XL '05 DMax CCLB 4x Have a Hickey Sidewinder Winch and need the owners/install manual? Send me a PM with your email address and I'll forward you a .pdf Last edited by Oilbrnr; 04-16-2010 at 07:37 PM.

04-16-2010, 07:45 PM	#12
jay55jay Registered User Join Date: Mar 2010 Location: bayville,nj Posts: 165	Re: changing manual tranny oil I found the plug half way up on the drivers side. About how much gear oil should i buy for it off hand.

04-16-2010, 08:01 PM	#13
Oilbrnr Registered User Join Date: Feb 2009 Location: Scottsdale, AZ Posts: 390	Re: changing manual tranny oil half gallon. Better to have to much and return one than being short in the middle of the job. It is enough of a PITA that you want to get'r done in one shot! I hate the smell of hypoid oil!!! __________________ -Don- '66 C10 w/factory A/C '77 Cheyenne K5 350/465/205 '80 Custom Deluxe K20 350/465/205 '04 Denali XL '05 DMax CCLB 4x Have a Hickey Sidewinder Winch and need the owners/install manual? Send me a PM with your email address and I'll forward you a .pdf



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