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01-18-2025, 02:43 PM
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#1
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Senior Member
Tiffin Owners Club Texas Boomers Club
Join Date: Feb 2018
Location: North Texas
Posts: 2,276
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Checking differential fluid on Powerglide
Can someone tell me which plug is used to check the fluid level? I'm guessing the inset one on the bottom since that is what they look like on a car.
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2014 Tiffin Allegro Bus 37AP
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01-19-2025, 02:13 PM
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#2
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Senior Member
Join Date: Jul 2020
Posts: 977
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Differential plug should be on the top third of the differential, not the bottom.
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2018 Phaeton 44OH
2023 Chevy Traverse Toad
Florida
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01-19-2025, 02:16 PM
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#3
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Senior Member
Tiffin Owners Club
Join Date: Sep 2012
Location: Columbus, NJ
Posts: 3,027
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Quote:
Originally Posted by Warhorse6
Differential plug should be on the top third of the differential, not the bottom.
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Larry & Cheryl Herman - Ranger, Henry, Georgie & Enzo (our Springers)
2019 Tiffin Allegro Bus 45OPP
2016 Ford Transit Connect on a Demco dolly
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01-19-2025, 04:03 PM
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#4
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Member
Join Date: Oct 2022
Location: Sisters, Oregon
Posts: 56
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the lowest one is a drain plug
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01-19-2025, 06:03 PM
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#5
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Senior Member
Join Date: Apr 2024
Location: WI Driftlesser
Posts: 2,583
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No, the oil level should be about a third full to something less than half. The oil level will be just above the inside of the axle tubes, so it will reach each end, they're roughly 1/4-3/8" thick. The drain should be on the bottom of the differential, not the ones shown in the pic. This is probably a modified axle that has the original plug for installation with a front engine, and the new one added for a rear engine. The plug that is closest to the level of the bottom tubes is the correct oil level, the upper plug would be that level if the axle was flipped.
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"Bringing third world electrical work to first world luxury." RV makers of Murica!
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01-19-2025, 06:28 PM
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#6
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Senior Member
Join Date: Jan 2014
Posts: 241
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One looks too high to me and one too low :-(. On my coach, I'm pretty sure the fill is the top one - with the square "nut" on the end. BuT - I don't think it's above the center of the rear axle tubes either.
Clean around both plugs, remove the top one and stick your finger in there and see if you end up in diff fluid.... Also a photo with the axle tubs in it for perspective would help.
Here you go - does this photo look like yours?
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01-19-2025, 06:58 PM
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#7
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Senior Member
Tiffin Owners Club Texas Boomers Club
Join Date: Feb 2018
Location: North Texas
Posts: 2,276
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Here the zoomed out pic. The inset one on the bottom is about 1/3 up and level with the axle. There is a drain plug on the very bottom, so I don't think the inset one is a drain.
Mine does look like the prior post.
This is a Powerglide chassis, so a modified Freightliner one.
The comment that one is for a FRED kind of makes sense. It would be about the same height up if you flipped the differential.
I guess it must be the square drive one slightly above the axle. I'll clean both up and stick my finger in the top one first.
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2014 Tiffin Allegro Bus 37AP
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01-19-2025, 07:38 PM
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#8
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Senior Member
Tiffin Owners Club Texas Boomers Club
Join Date: Feb 2018
Location: North Texas
Posts: 2,276
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Here the zoomed out pic. The inset one on the bottom is about 1/3 up and level with the axle. There is a drain plug on the very bottom, so I don't think the inset one is a drain.
Mine does look like the prior post, so I guess it must be the square drive plug. I'll clean both up and stick a finger inside.
This is a Powerglide chassis, so a modified Freightliner one.
The comment that one is for a FRED kind of makes sense. It would be about the same level if you flipped the differential.
The Tiffin chassis manual is so good for chassis lube points. Surprised they only state to check it.
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2014 Tiffin Allegro Bus 37AP
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01-19-2025, 07:55 PM
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#9
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Community Administrator
Tiffin Owners Club
Join Date: Sep 2013
Location: DFW, Texas
Posts: 24,221
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That looks like the correct plug. The fluid level only has to be high enough to flow out to the wheel bearings on both sides.
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2017 Phaeton 40IH XSH Maroon Coral - Power Glide Chassis with IFS
Previous '15 Tiffin Allegro RED 38QRA and '06 Itasca Sunrise 35A
White '24 Jeep JLU Wrangler Willys
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01-19-2025, 08:58 PM
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#10
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Senior Member
Join Date: Jan 2014
Posts: 241
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This is from the tiffin supplied docs on the flash drive:
Bus-Phaeton Chassis Manuals/Suspension/Drive Axle/23K Service Manual.pdf
Also this: Torque for fill and drain plug 40–60 lbs. ft
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01-19-2025, 11:01 PM
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#11
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Senior Member
Join Date: Apr 2024
Location: WI Driftlesser
Posts: 2,583
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Thank you, so it is the top one in the pic. Hard to judge the angle of the pictures I guess, a level would tell the difference.
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"Bringing third world electrical work to first world luxury." RV makers of Murica!
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01-20-2025, 09:33 AM
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#12
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Senior Member
Tiffin Owners Club Texas Boomers Club
Join Date: Feb 2018
Location: North Texas
Posts: 2,276
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I just got confirmation from Tiffin. It is the top, square drive, plug.
Appreciate the torque specs. The manual for my year doesn't have that info, or the drawing.
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2014 Tiffin Allegro Bus 37AP
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