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Model T Custom need Gear Set

November 25, 2014 - Author: BartBarton

Model T Coupe with 302 engine.

Question:  Understandably, this is a aam 021custom application. I have shoehorned a Hipo 302 with a C4 and narrowed 8″ rear into a 1925 Model T Coupe. I am running 10″x15″ tires on the rear and 5″x14″ up front. Originally the rear had 2.78 gears. I have installed 3.80 with a locker but feel the RPM will be quite high for a comfortable long distance ride and a 12 gallon fuel tank. I am leaning towards either 3.00 or 3.25 rear ration. Any advice?

Answer:  Below is a quick formula that will let you calculate te correct gear ratio that you need.

RPM= MPH x  Gear Ratio x  336   then divide this by tire diameter in inches. This will tell you what RPM you would be at with whatever MPH & Ratio you select.

Give Lance or James a call toll free 800-444-0755 the can help you get the correct parts the first time.

No Comments - Categories: Rear End Ring & Pinion

Change Gear Ratio Dodge Larime

October 13, 2014 - Author: BartBarton

I have  1999 Dodge Larime 1/3=2 ton pickup 318 automatic 4WD

Question: Would like to know if you have a 4.10 ring&pinion set front and rear. For my truck .Also would like to add a front locker .I have a 5 inch lift and 33/12.5/15 tires. If so cost and shipping to Hawaii.

Answer:   We can provide the following part for your application:

  • Rear diff should be 9.25 inch Chrysler order our ring and pinion number PFC9.25-410 your cost $ 214.48
  • You should also probably change the bearings you will need part number PFR-925-R your cost is $117.72
  • Front Dana 44 ring and pinion kit  is our part number PFDN70738-5X your cost is $ 263.92
  • Again you should change the bearings order part number PFD 706032X your cost is $ 31.60
  • For the front locker we recommend the True Trac part number PF913A592 your cost is $530.24 plus S&H.

Give Lance a call 800-444-0755 he can help you get the correct parts the first time.



No Comments - Categories: Rear End Ring & Pinion

Dodge Challenger 73 need Ring & Pinion Set

October 9, 2014 - Author: BartBarton

I have a 1973 Dodge Challenger 318 engine with automatic

Question:  I have a 1973 Dodge Challenger with a 8.75 diff it is a 489 differential and I’m looking for the standard ring and pinion 2.74-1 do you have anything in stock, maybe even 2.9-1?

Answer: Nothing out there that we know of, a 3.55  ratio is the closest we can get.


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No Comments - Categories: Rear End Ring & Pinion

1970 Pontiac Firebird need new Positraction & Gears

May 19, 2014 - Author: BartBarton

I have a 1970 Pontiac Firebird with the 455 engine and automatic transmission.

Question:  The firebird needs positraction and a new change in gears from 2-56 to ? The firebird has the TH400 transmission, 8.2 10 bolt Pontiac rear end. need something with more pulling power and still comfortable to drive down the hi way. 3,08 or 3.36 ? had a TH350 in car but 455 with  60 over mild camshaft, ate them ! Went with 400 now lost some pull in 1st and 2nd gear. what to do and how much?

Answer:  You can figure you RPM at whatever MPH you want to drive with this formula RPM = MPH X Gear Ratio X 336 then divide this by the tire diameter in inches.


Replacement for GM Stock Posi

Here are some options we recommend see if any of these will work for you:

  • Eaton positraction you will need is part number PFEA19674-010 $526.27
  • Motive 3.55 Gears PFMWBP882355 your cost is $262.85 there is also a Yukon 3.36 Gears available part number PFYG GMBOP-336 your cost for this gear kit is $294-55
  • You will also need a bearing rebuilt order our part number PFR-10-82 your cost is $ 116.41 plus S&H. These are all high quality aftermarket parts.

If you have additional questions, to place order or need help give Lance a call at 800-444-0755 he can help you. Installation is available in our shop in Maple Grove MN, just give us a call to schedule.


No Comments - Categories: Positractions, Rear End Ring & Pinion

See You At Back to the Fifties Weekend

May 12, 2014 - Author: James N


back to 50

Can you believe 47 year of back to the fifties

We are Equipped to work on your fifties Classic ride. We can build you a new drive shaft or fix your old drive shaft.

Need a Clutch for your Classic Car

Find are Ad in the Linechaser or your program at the show                                                                                                                                                                                                                                  We offer discounts to MSRA members

Call James 1-800-444-0755

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No Comments - Categories: Around the Shop, Automatic Transmissions, Clutches, Drivelines, Manual Transmission, Positractions, Rear End Ring & Pinion, Uncategorized

Ford 8.8 inch Explorer Differential Problem

March 18, 2014 - Author: BartBarton

I have a Ford Explorer 1996, call the dealer with VIN and he told me it was the 8.8 inch differential.


Master Rear End Rebuild Kit
(open differential non posi)

Question:  My rear end is making a lot of noise, can you help me diagnose?  What parts should I order?

Answer:  Ring and Pinion Set damaged or worn out Chipped ring gear makes a loud click or clang. The leading cause of chipped teeth on the ring or pinion gear is abuse. This abuse usually happens when the vehicle gets stuck. The tendency is to rock the vehicle backwards and forwards simply by shifting from reverse to low and back repeatedly attempting to break free, this puts high force on the teeth causing one or two to fail.

Be sure your backlash is correct, and your pinion and carrier bearing preload is correct. Check your differential specification for rotational torque on the pinion, and the carrier should have to be tapped directly into position, not hammered hard or fall in and out. Improper preload can be a main cause of early bearing failure. Checking the ring and pinion gear pattern that is the best way to determine an excellent install. The gear set and housing determine the correct install depth (check your rear end specification), you will need a magnetic base and dial indicator to get this correct.  We would suggest that this repair be left to some one with experience and tools,  It would be a good idea for you to provide the parts, this will save you some money!  You can see the ring and pinion parts that we can supply on our site.

No Comments - Categories: Rear End Ring & Pinion

Motive Gear Ring and Pinioin

January 27, 2014 - Author: BartBarton

On display at Winter in the Rocks in Southern Utah on Jan 24 and Jan 25 at Sand Mountainjee;_hanging_on_wall.

Is your Jeep hung up?  We offer a complete line of Motive Gear ring and pinion set plus positraction units, bearing overhaul kits, clutch kits, axles and much more.  We can supply a new high speed balance driveshaft or re-manufacture your driveline and save you some money! Take advantage of our technical expertise just give us a call 800-444-0755.motivegear_blog

No Comments - Categories: Rear End Ring & Pinion

Extended Life Ring & Pinion Gear Sets

January 9, 2014 - Author: BartBarton

We are a stocking warehouse with American Axle Manufacturing (AAM) aftermarket Drivetrain products.  We provide our customers with high quality, reliability, durability and performance in every aftermarket part we sell including:

  • Drivelines and driveline components
  • Ring and Pinion Sets
  • Bearing Overhaul Kit
  • Front and rear differential carrier and positractions sets
  • Front differential carrier assemblies
  • Axles

AAM designs, engineers, tests and validates components to meet the same exacting specifications as the parts that they replace the components that were originally built for Original Equipment vehicle manufacturers.

The AAM ring and pinion gear sets that we offer are uniquely designed to match the requirements the OEM designated for your specific vehicle. All performance factors for the size and weight of the specific vehicle must be taken into account. Our innovative “Two-Cut” manufacturing process ensures the lowest tolerances possible for the quiet operation required by OEM customers. This “Two-Cut” design also allows for easier set up in the aftermarket replacement business. The combination of materials, heat-treating and cut geometry allows for a gear set that has ten-times the life of a non-OE gear set.

You can see a detailed list of ring and pinion sets, bearing overhaul kits and axle that we provide list on our site.

No Comments - Categories: Rear End Ring & Pinion

Ring and Pinion

January 3, 2014 - Author: BartBarton

Improved Fuel Economy and Towing Power!

Running the incorrect ring and pinion differential ratio can cost you a lot of money! We offer a wide range of differential rear end repair parts and upgraded assemblies plus installation services domestic vehicles that include American Axle, GM Chevrolet, Dana, Ford and Jeep.


ring and pinion set

No Comments - Categories: Rear End Ring & Pinion