G2 Axle & Gear Hammer GM 10 Bolt 8.5" Differential Cover (Raw Aluminum) - 40-2021AL

universal fit logo


  • G2 Axle and Gear | Part Number: G/240-2021AL
  • Popular Axle Manufacture:GM
  • Axle Location:Rear
  • Fitment:Universal Fit
  • Finish Type:Natural
  • Type Of Material:Aluminum
  • Axle Type:GM 10 Bolt 8.5 Inches|GM 10 Bolt 8.6 Inches
  • Oil Capacity:Extra Capacity


G2 aluminum differential covers are designed to not only protect your ring & pinion, they are designed to help cool your gear oil for prolonged bearing life. Made from high strength heat treated aluminum to withstand direct hits, these covers help protect your investment while adding a distinct look to your vehicle.

Customer Reviews

4.0 4.0
5 Customer ratings
5.0 Return

Will not fit a 2007 Yukon Denali because of the trac bar.

5.0 great customer service

great service very , the guys at 4wheels parts are the best thank you

from cali |
1.0 Front differential cover incorrect information

This cover doesn’t fit front diff 89 3/4 suburban which is a10 bolt 8.5 lot of work for nothing. Spoke with a tech from 4Wheel said this would Work for you. Disappointed !

4.0 Great Looking Product

Went in with ease during installation. The supplied hardware was too short to install the new cover. Was supplied with the same length bolts as factory design. The design and location of the fill plug is perfect for easy fill.

from Stillwater, Ok |
5.0 Bst Looking Covers & Heavy Duty..!!

Truly Excellent Quality Made And Great Looking...Just Would Have Preferred Chrome Or Stainless Bolts Or Option To Upgrade To Them

from Youngstown,Ohio |


Question & Answers

18 Answered questions

Q: Will this fit 2000 Silverado 4x4? Stock height? Answer this question

A: I would call G2 diff cover manufacturer. They would know.Don’t order till you call them.You will be upset do all the tear down have it not fit .  Thank’s John.

Answered by J engineer on 04/15/2021

Q: Can I buy a magnetic drain plug for this cover? Answer this question

A: We do not sell one the plug separately.

Answered by Kelly from 4WP Corporate Headquarters on 01/28/2021

Q: Is there any way to add a magnet to this cover? Answer this question

A: Look for magnet drain plug or install one on the drain plug 

Answered by J engineer on 01/28/2021

Q: Does it have a magnetic drain plug Answer this question

A: No but part number does 40-2021mb.

Answered by Kelly from 4WP Corporate Headquarters on 12/08/2020

Q: got a 2003 suburban z71 will this clear the track bar for install and is the correct cover Answer this question

A: Hello On the lifted Suburbans it does clear on stock height the bar needs to be modified. Thanks

Answered by Rody on 08/30/2015


G2 Axle & Gear uses the strongest and latest generation materials to manufacture products capable of handling heavy loads. When it comes to axle assemblies, core lockers, driveshafts and sway bars, G2 is the first name in durability and reliability. Off-roading can heap punishment on a Jeep and G2's laser-cut components offer superior handling on challenging terrain and on-road drives. Parts are easy to install and easy to service and above all, they remain operational in adverse environments. Shop G2 Axle and Gear Now


Download Form Download

Sign up to receive deals by email!

Sign up to receive deals by text!

By submitting, you agree to receive recurring autodialed marketing text msgs (e.g. cart reminders) to the mobile number used at opt-in from 4 Wheel Parts (4WP) on 21208. Consent is not a condition of purchase. Msg frequency may vary. Msg & data rates may apply. Reply HELP for help and STOP to cancel. See Terms and Conditions & Privacy Policy