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Unread 07-19-2014, 05:35 PM   #1
AZ_Chip
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Gearbox fluid removal

1978 CJ7, Tried to search, no help. Is there a way to remove gearbox fluids without plate removal? Do the handheld vacuum pumps work? Does it get the old fluid out? Thanks,

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Unread 07-19-2014, 11:11 PM   #2
RenoF250
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I don't remember having to remove a plate, perhaps your year is different. Regardless, I would not use a pump, it would be very difficult to get the hose to the bottom and I would not trust it to get all the junk out.
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Unread 07-20-2014, 04:43 AM   #3
Mike Romain
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Gear boxes have drains. Diffs need the covers removed to be sure you get all the crap out. Be very sure you use the correct gear oil for the gear boxes. GL4 or synchromesh fluid. Nothing that even hints at GL5 on the label works.
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Unread 07-20-2014, 06:17 AM   #4
JeepHammer
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Mike Romain is correct, I have yet to see a gearbox without a drain plug...
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Unread 07-20-2014, 07:57 PM   #5
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Usually a pipe plug......usually same as the fill one.....might be a outy or a inny.......IE, it will have a square recessed or sticking out.
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Unread 07-20-2014, 08:37 PM   #6
RenoF250
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Quote:
Originally Posted by Mike Romain View Post
Gear boxes have drains. Diffs need the covers removed to be sure you get all the crap out. Be very sure you use the correct gear oil for the gear boxes. GL4 or synchromesh fluid. Nothing that even hints at GL5 on the label works.
You can use GL5 in the transfer case. No yellow metal in there.
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Unread 07-20-2014, 09:00 PM   #7
FLynes
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Originally Posted by RenoF250 View Post
You can use GL5 in the transfer case. No yellow metal in there.
Don't the transmission and transfer case share the same fluid in some models?
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Unread 07-20-2014, 11:43 PM   #8
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Quote:
Originally Posted by FLynes View Post
Don't the transmission and transfer case share the same fluid in some models?
I just got a FSM and it states some models do....but does not specify which ones......I would treat all as they did share.

Unless you have had it apart to know for sure....or did some sort of pressure test to see if air makes it thru to the other side.........the way the manual states "some models" leads me to believe it is going to be hard to tell which ones do or do not......share.
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Unread 07-21-2014, 04:35 AM   #9
AZ_Chip
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Quote:
Originally Posted by JeepHammer View Post
Mike Romain is correct, I have yet to see a gearbox without a drain plug...
Guess I need better eyes or more light.
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Unread 07-21-2014, 06:22 AM   #10
Mike Romain
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Originally Posted by AZ_Chip View Post

Guess I need better eyes or more light.
Post a couple photos and we can likely spot them for you.
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86/00 CJ7 Laredo, 33x9.5 BFG AT's, 'glass nose to tail in '00, 'New' frame,wires and plumbing in '09. Carter BBD Carbed 4.0 HO in '10.
89 YJ Renegade. BBD Carbed 4.0 HO. Locked front and rear with 33x9.5 BFG AT's
Some Canadian Bush Jeep Runs and Build Photos: http://mikeromainjeeptrips.shutterfly.com (10 new albums added Sept 16/10)
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Unread 07-21-2014, 06:31 AM   #11
gmakra
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If your talking about the Dana 300 it takes an Alan Wrench on the low point of the case.
The trans and transfer case are two different entities and drain and fill are separate for each one.
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Unread 07-21-2014, 06:40 AM   #12
Requiem4aCJ
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If you're talking about the transmission in the jeep in your profile, an automatics isn't usually called a gearbox and yes you need to drop the pan to change the fluid and filter
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Unread 07-21-2014, 06:47 AM   #13
Mike Romain
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I use a phone app to view the group which does not show profiles or SIG lines. It would be real helpful to you if you posted the details of your Jeep. As mentioned an automatic is not normally called a gear box. Slush box maybe, but not gear box.
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86/00 CJ7 Laredo, 33x9.5 BFG AT's, 'glass nose to tail in '00, 'New' frame,wires and plumbing in '09. Carter BBD Carbed 4.0 HO in '10.
89 YJ Renegade. BBD Carbed 4.0 HO. Locked front and rear with 33x9.5 BFG AT's
Some Canadian Bush Jeep Runs and Build Photos: http://mikeromainjeeptrips.shutterfly.com (10 new albums added Sept 16/10)
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Unread 07-21-2014, 08:12 AM   #14
CSP
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Transmission or transfer case to be specific.
Anything with gears in it could be called a gearbox.
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Unread 07-21-2014, 01:26 PM   #15
AZ_Chip
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CJ7
AMC 360
TH400 Trans
Dana 30 front
AMC 20 Rear/ Moser one piece axle
Detroit Locker Rear
Dana 20 Transfer case

Automatic tranny is already done. I did that last week. I was looking at the gearboxes, Front diff, rear diff, and transfer case and only located the rear fill plugs. I have seen some with only a plug mid way up the case. If the drain plug is flush, like a square drive flush plug I have not located that yet on any of them. Also new to me is the vent line or the line on the front diff. Have not seen that before. Someone mentioned GL-4. Is that the same as what is specified in the Jeep manual, 75-90W?

Thanks for the help guys. A lot of learning going on.
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