11-20-2018, 09:34 PM
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#1
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Join Date: Sep 2016
Location: North Vancouver, BC
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Senior Member
Join Date: Sep 2016
Location: North Vancouver, BC
Posts: 1,740
Real Name: Just call me the Grease Monkey
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How do I test the front differential?
I need to swap out my whole front diff because it is 4.1 but I put 4.3 in the rear. I really should do this swap since I'm planning a trip over the holidays. I have the "new" 4.3 one which is in pretty good shape but it would be nice to be able to test it before putting it in. Do I just need to put a vacuum on some hoses? Or is it highly likely to work so I shouldn't worry about it?
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11-21-2018, 01:57 PM
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#2
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Elite Member
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Join Date: Mar 2016
Location: Pasadena, CA
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Elite Member
Join Date: Mar 2016
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What do you want to test about it? Without opening it up, you can't really tell much about it without installing it and putting it under load.
Unless you want to make sure it is a 4.3 diff - in which case, you can either apply vacuum or manually move the ADD collar. You'd still need axles in both sides to count revolutions...
-Charlie
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11-21-2018, 02:21 PM
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#3
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Senior Member
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Join Date: Sep 2016
Location: North Vancouver, BC
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Real Name: Just call me the Grease Monkey
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Senior Member
Join Date: Sep 2016
Location: North Vancouver, BC
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Real Name: Just call me the Grease Monkey
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I want to test the ADD. I already checked the 4.3 ratio which actually is a little concerning since I just turned the driveshaft and watched the things inside the CV ports turn. But I understand that normally the shaft shouldn't turn the CV's unless vacuum is applied, correct?
Basically, I'd want to confirm that vacuum / no vacuum causes he correct engagement of the driveshaft.
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My Snow and Sand build thread
Mark_BC's 2000 Limited Salvage Build
Determined to keep them from becoming parts trucks. Yes, even the one I just picked up as a parts truck...
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11-21-2018, 04:32 PM
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#4
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Elite Member
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Join Date: Mar 2016
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The ADD actuator is swapable on the truck... So even if it is broken, you can swap your current one in easily. But yeah, you need to apply vacuum to one of the two ports. I couldn't tell you which one through - just try both.
-Charlie
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'99 4Runner SR5 Auto - 4WD swapped
'89 Camry Alltrac LE 3S-GTE 5spd
'17 Chevy Volt Premier
'16 Honda Odyssey Elite
Previous: '88 Camry Alltrac LE 3S-GE BEAMS, 90 Camry 3S-GTE, 90 Camry DX, '03 WRX wagon, '08 Outback XT
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11-21-2018, 05:43 PM
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#5
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Elite Member
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Join Date: Nov 2006
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When in doubt, RTFM:
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'99 4Runner SR5 5spd 3.4L V6 4WD(U.S), original '99 Talls in front, OME 906s in back, Hella fogs, Trekmaster shocks in front, Billy in back, no running boards, FIAMM horns, Alpine sound, Michelin LTX M/S2's, owned since new.
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