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OTC 6602 Differential Bearing Preload Wrench

5.0 out of 5 stars 37 customer reviews

Price: $54.08 & FREE Shipping. Details
Only 20 left in stock (more on the way).
Ships from and sold by Amazon.com.
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  • Similar to Miller C-4164
  • Fits inside axle tube to access the threaded adjusters
  • Use to adjust differential bearing free play on Chrysler/Dodge vehicles with 7-1/4, 8-1/4, 8-3/4, and 9-1/4 rear axles
  • Weighs only 2lbs. 14oz.
23 new from $40.71
$54.08 & FREE Shipping. Details Only 20 left in stock (more on the way). Ships from and sold by Amazon.com.

Frequently Bought Together

  • OTC 6602 Differential Bearing Preload Wrench
  • +
  • Allstar Performance ALL68372 Pinion Yoke Wrench
  • +
  • Dial Indicator, Magnetic Base & Point Set
Total price: $103.76
Buy the selected items together

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Product Information

Technical Details

Brand OTC
Item Weight 4.2 pounds
Product Dimensions 8.5 x 34 x 3.4 inches
Item model number 6602
Manufacturer Part Number 6602

Additional Information

ASIN B000OCKIHE
Customer Reviews
5.0 out of 5 stars 37 customer reviews

5.0 out of 5 stars
Best Sellers Rank #13,988 in Automotive (See top 100)
#29 in Home Improvement > Power & Hand Tools > Power Tools > Impact Wrenches
#3,181 in Automotive > Tools & Equipment
Shipping Weight 4.3 pounds (View shipping rates and policies)
Domestic Shipping This item is also available for shipping to select countries outside the U.S.
International Shipping This item can be shipped to select countries outside of the U.S. Learn More
Date First Available July 7, 2004

Warranty & Support

Warranty, Parts:Parts
Manufacturer’s warranty can be requested from customer service. Click here to make a request to customer service.

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Product Description

This tool, with its sleek design, is able to fit inside the axle tube to access the threaded adjusters. Use to adjust differential bearing free play on Chrysler/Dodge vehicles with 7-1/4, 8-1/4, 8-3/4, and 9-1/4 rear axles. This is very simple to use.

Customer Questions & Answers

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Top Customer Reviews

Verified Purchase
This is absolutely necessary to overhaul a Chrysler 8-1/4 or 9-1/4 rear end. You can make one if you have a welder, otherwise you will need this or similar to loosen the differential bearing adjusters inside the housing through the axle tube. Pretty much useless for anything else, but you save yourself a $G-note by doing the work yourself. The only other 'special' tools you absolutely need is a 0-60 inch/lbs dial or beam type torque wrench to check the critical pinion bearing preload, and a dial indicator to check the ring gear backlash. Not any easy job by any stretch... but well within the capability of an experienced home mechanic. Make sure you have a factory manual for procedure.
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Verified Purchase
I have worked on cars my whole life, and I neverheard of such a tool. What I thought was a simple repair became a nightmare! Why? because I didnot have a Diff Bearing Preload Tool. 2days of searching locally and trying to make something was in vain. finally ordered it from Amazon, had in 2days and it took(no kidding)3mins to loosen the bearing preloads!! Bear in mind I already had my differential apart but, so much easier with the proper tool. Buy it, works great.
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Verified Purchase
Have to have tool.... unless you have a 36mm nut, an old 1/2in drive socket, weld them together and use a long extension. After i ordered this tool, I got creative and made my own just to get the job done. Now I have a home made tool and this nice new OTC in my box. Definitely would be handy having two when adjusting the carrier anyhow.
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Verified Purchase
Works great for what it does if you don't have it then you'll be bringing your truck to have your rear end rebuilt by someone that says they are a master at doing it and then a couple weeks you will find out they have no clue what they are doing Believe me I had to find out the hard way so if you are into doing it your self get the tool and do it don't forget you're going to need a few other tools to go along with it I give it a five star because I've got about four more rear end that I need to rebuild right now and I'm sure they'll be a few more after that just did two would that tool alone holding strong great tool
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By shane on November 14, 2013
Verified Purchase
It works great for the job intended . I used this for a ring and pinion and locker install . Granted it is a little more then a nut welded to a shaft but I didn't feel like trying to make one. buying and using 2 of them does make setup easier .
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Verified Purchase
Ordered this to repair rear diff in jeep and made to whole job painless to properly setup! Only wish was to have 2 so not so much fishing tool going side to side to do adjustments but still easier than anything else! My buddy welded a large nut onto socket to do same job (free is best) but issue is keeps falling off inside diff when doing job and he did not want to weld extension also to it as then it would have cost much more (socket was broken cheap one)
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Verified Purchase
Glad I bought this could not have done the job without it s little pricey for the material but overall very good product
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Verified Purchase
Great Product. Tool worked like a dream and I was very happy with the Price. Shipping was right on time:)
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