a division of Visual Diagnostics LLC
High Clearance Axle Kit
NOTE: Due to high order volume and supply chain issues, it may take some time for deliveries, production and shipments to catch up. Order backlog could be up to 8 weeks.
Contents:
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Introduction:
The Toyota 8" axle makes use of a dropout differential, or third member). Because of this, a drain plug is installing on the bottom of the axle housing to allow for draining the gear oil. Other types of axles feature a cover plate that serves this same purpose. One problem with the low hanging drain plug is that it is prone to getting hung up on rocks, and it can also become damaged to the point where removal is difficult, or worse yet can get knocked loose causing the loss of the gear oil in the axle. Several improvements on the drain plug have included low profile socket plugs, to welded in place plugs with alternate method of oil draining.
A second problem with the axle housing is that while the steel in the main part of the housing is approx. 3/16" thick, the steel in the face of the housing is perhaps 1/16" thick. It is susceptable to damage from contact with rocks and if pushed in far enough, it can contact the ring gear, either damaging the gear or letting the gear cut through the steel and create an oil leak. There are several forms of "diff armor" on the market to address this issue.
Over the years, I've tried a number of these techniques to beef up the axle to withstand trail abuse. Each problem could be addressed individually to some degree, but I wanted something cleaner and that would address all the issues at once. Below, is a rear Toyota axle housing showing the bottom section, containing the drain plug, cut out and replaced with a flat bottom plate that also wraps around the front (or rear) of the housing:
I developed an easy to install kit, pictured below, that incorporates a flat replacement for the bottom of the axle housing and a curved protector for the face of the housing, all out of 1/4" thick steel:
Contact us with any questions about the kit...
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Ordering Information:
At this time, 4Crawler Offroad is not able to offer axle plates for sale.Kits available for the front or rear axle, for US$50.00 for either kit or a front+rear kit for $95.00, plus shipping via USPS Flat Rate envelope.
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Order a front or rear axle plate kit: US Delivery |
Order a front + rear axle plate kit: US Delivery |
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Order a front or rear axle plate kit: Can/Mex Delivery |
Order a front and rear axle plate kit: Can/Mex delivery |
| # # # # # # # # # # # # # # # | # # # # # # # # # # # # # # # |
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Order a front or rear axle plate kit: International Delivery |
Order a front and rear axle plate kit: International delivery |
Already have a "diff protector"? No problem, a version of the plate that only covers the center section of the axle housing is also available for US$45.00:
| US Delivery | Can/Mex Delivery | International Delivery |
Allow 1-2 weeks for fabrication of this kit plus shipping time, 2-3 days typical for domestic and 6-10 days typical for international orders.
NOTE: Due to high order volume and supply chain issues, it may take some time for deliveries, production and shipments to catch up. Order backlog could be up to 8 weeks.
Questions? Contact 4Crawler Offroad for more information.
Installation Process:
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| A: Axle housing prepped | B: Mark for cuts | C: Cut out bottom of housing |
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| D: Grind opening to fit plate | E: Tack weld, bend tabs | F: Finish welding and grinding |
- Remove the axle from the vehicle (A)
- Remove the differential and clean the inside of the housing of gear oil
- Mark the outline of the cutout area, using the included template (B)
- Remove the lower four studs, the two lowest ones will become the oil drains (C)
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Make straight line cuts are made to remove the bottom of the housing:
(C)
- Cutoff wheel, sawzall, oxy-acetylene cutting torch or plasma cutter will make the cut
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The opening is ground out to allow the plate to drop in (D)
- You can cut/grind the back egde of the rear axle housing to let the plate sit in deeper if you have the rear pinion tipped up for a CV shaft
- And with the non-diff. protetor plate, the plate just sits on the front and rear flange and does not extend past the front flange.
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Weld the plate in place, first tacking the corners then weld in short
sections, allowing the housing to cool in between (E)
- Filling the bottom (actually the top) of the housing with water helps soak up the heat
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For the diff. protector plate, bend over the three tabs and add the
protector plate around the housing and weld in place
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If needed, grind a deeper groove where the tab bends over the housing
or heat to make it easier to bend
- Fill in the groove after bending.
- The two small steel wedges can be used to fill the gaps on the ends where the tabs meet the housing
- The inner seams can also be welded closed for a stonger and more leakproof installation
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If needed, grind a deeper groove where the tab bends over the housing
or heat to make it easier to bend
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Grind the outside welds smooth, clean, prime and paint as desired (F)
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Tip the housing back and fill it with water or paint thinner to check
for leaks
- If a leak is detected, re-weld the inside or outside as needed
- Clean the inside of the housing and if desired, apply an oil proof primer/paint, such as POR-15
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Tip the housing back and fill it with water or paint thinner to check
for leaks
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To replace the oil drain plug the two existing lower studs that hold
the 3rd member in place are converted to bolts by welding the nuts to
the stud after its tight
- These parts are not included in the kit, you re-use your old studs and nuts
- Alternately, you can use some M8-1.25 bolts for the lower two studs in place of welding the nut to the stud
- We can supply the proper sized grade 10.9 metric bolts and lock nuts for the stud upgrade, enquire for details.
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You may find that it is easier to install the 3rd member if you drill
out the mounting holes a little oversize
- Use a bit about 1/64"to 1/32" larger than the existing hole to clean it up and make it easier to slip over the studs
- Re-install the axle on the vehicle
The end result of a couple of hours work is an axle that has 3/4" - 1" additional ground clearance (equivalent to a ~2" tire size increase), a smooth base to easily slide over trail obstacles, an integral diff protector and no drain plug to get damaged or lost.
- Here's a writeup from my first high clearance axle conversion:
- https://4Crawler.com/4x4/CheapTricks/AxleTech/index.shtml#Clearanced
- Here's Tim Stucky's excellent writeup on 4x4Wire:
- http://www.4x4wire.com/toyota/reviews/shaved_diffs/
[Last updated: 28.May.2024 ]
Visitor # 64891 since 28.AUG.2001