SKU: 25451258882
gear conversion

gear conversion SpeedFactory Racing FWD2AWD B-Series Gear Conversion Kit – IPGparts

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Description

gear conversion SpeedFactory Racing FWD2AWD B-Series Gear Conversion Kit – IPGpartsThe SpeedFactory Racing FWD2AWD B Series Gear Conversion Kit has been created to provide you with the parts and modifications needed to easily retrofit a stock layout FWD B Series gear set into your B AWD transmission with NO MACHINE WORK required! Detailed instructions are included, and we recommend checking out our FWD2AWD YouTube Video for an in depth install with component explanations. Why would you want to do this? The B AWD factory ratios were

The SpeedFactory Racing FWD2AWD B-Series Gear Conversion Kit has been created to provide you with the parts and modifications needed to easily retrofit a stock layout FWD B-Series gear set into your B AWD transmission with NO MACHINE WORK required!

Detailed instructions are included, and we recommend checking out our FWD2AWD YouTube Video for an in-depth install with component explanations.

Why would you want to do this?

  • The B AWD factory ratios were designed for a heavy SUV with a low 6.3k-6.7k rpm rev limit and feature a super short 1st gear which does not work well with high revving high performance applications and creates major shifting difficulties due to the huge ratio spread on the 1/2 shift.

  • The stock B AWD 1/2 shift forks are very thin and weak, often bending even in stock transmissions and are too thin for use with a FWD 1/2 slider.

  • B AWD specific gear set options are very limited and retrofitting other oem gears used to require tedious machine work and custom spacer machining.

This kit now eliminates any need for machine work and opens your ratio options up to use almost any existing B-Series FWD gear set (either synchro or dog engagement that uses a factory style layout) and at the same time fixes the weak 1/2 shift fork issue by replacing it with a new much thicker and stronger billet fork!

 

Included Components/Services:

1. Billet SFR 1/2 Shift Fork Conversion Service (Requires customer-supplied B-Series AWD 1/2 shift fork core to be sent to us) - Our hardened & shot peened billet steel retrofit upgrade is super strong and has the proper fork pad thickness to work with a FWD 1/2 slider.

2. Custom SFR 1st Idler Gear Split Needle Bearing - Previously if you wanted to attempt this conversion you had to machine the ID of the 1st gear larger or machine the countershaft journal height larger. With this custom bearing no machining is necessary!

3. Custom SFR Precision Spacers – Needed to achieve proper component locations

    1. Mainshaft Spacer (replaces the oem flat washer under the mainshaft - retain the flex washer underneath and set endplay to factory specs)
    2. 1/2 Hub Spacer (goes under the 1/2 slider hub)
    3. Reverse Thrust Washer (goes under the reverse idler gear if you are using a short 41.9mm tall FWD 3.0 ratio idler gear. If you have a 45.8mm tall FWD or AWD 3.0 ratio reverse idler gear you do not need to use this washer)
    4. Upper Cuff Shim (For use with Albins B Dog Set only, not used for synchro sets)

NOTE: You will need to use the gears, hubs, sliders, and synchros from the FWD sets and the pinion shaft and ring gear will still need to be an AWD specific set – either OEM or OEM compatible aftermarket final drive set. (Note: The B AWD 2nd synchro & 3rd/4th hub/slider/synchros can also be used.)

After you purchase this kit, please send your stock, unmodified B AWD 1/2 Shift Fork along with your contact information and order # to:

SpeedFactory Racing
ATTN: FWD2AWD
5001 S Burlington Way Suite A
Tacoma, WA 98409
NOTE: DO NOT SEND IN A FORK THAT HAS BEEN PREVIOUSLY MODIFIED OR HAD BRACES WELDED ON, WE WILL NOT USE IT.

_______________________________________________________________________________________________________

What Do You Recommend for Synchro Sets?

For a super strong and street-able synchro set we recommend using the Albins Helical B Synchro set.

If you simply want the ability to run different ratios and don’t need the strength of a high quality aftermarket gearset, then the factory B16/ITR/GSR type gearsets will now be an option for you. We do not recommend using LS gearsets. Although the 1/2 are the same ratio as GSR, it lacks the dual-cone synchro on 2nd gear and will not work well for a high rpm/fast shifting performance application. LS 3/4 gears are not compatible as they use a smaller 54mm synchronizer.

What About Dog Sets?

For race car use we recommend the Albins 1-4 Helical B Dog set with Upper Cuff that we have used reliably for the last decade on our own record setting race cars.

If you are using an Albins 1-4 Helical B Dog set with Upper Cuff with this conversion  you will also need to have your 5/R shift fork diameter enlarged.

We have not tested any other brands of B FWD dog sets for fitment/compatibility with this conversion kit other than PPG B FWD Dog sets which are NOT compatible as they use a non-oem style layout on the pinion shaft. If your current dog set uses a pinion shaft that has factory style splines then it should be compatible, but we cannot guarantee that.

What About Final Drives?

You can choose to retain the short factory B AWD 4.562 final drive set or upgrade to an aftermarket B AWD specific final drive set that is compatible with OEM. We recommend the Albins B AWD Extreme Duty Final Drive Set.

5th Gear Shift Fork Options:

It is simplest to stick with the factory AWD 0.812 5th gear and its matching synchro hub/slider/rings, and this is by far the most popular 5th gear option.

If you really want to run a FWD 5th gear it is going to take quite a bit of work. Due to the larger diameter 54mm synchronizer ring used on the FWD 5th gears, you will need to enlarge the diameter and thicken the pads on the AWD 5/R shift fork. You will need to run the FWD synchro hub/slider/rings and slightly clearance the inside of the transmission case to clear the larger diameter slider, it will rub the case otherwise and hang up.

If you are using a FWD 1-4 Dog set with an upper cuff it will have a 5/R fork spacer that is FWD diameter and you will need to open up the diameter of the 5/R fork to fit as well.

NOTE: We no longer offer the 5/R fork conversion service due to lack of demand.

Frequently Asked Questions:

  1. Can you send me modified forks and then I’ll send you my cores back?
    No. The forks you send will be modified and then sent back to you. Allow up to 2 weeks for processing.
  1. What about the 3/4 shift fork?
    Your factory AWD 3/4 shift fork is the same thickness and diameter as the FWD sets and does not require any changes.
  1. I noticed that the FWD input shaft is a bit shorter than the AWD input shaft. Does the FWD input shaft not reach the pilot bearing?
    The FWD mainshaft pilot snout still reaches over half way into the pilot bearing which is just fine and doesn’t cause any issues.
  1. What about the clutch spline length, I noticed that those are a bit different between FWD and AWD?
    Although slightly different in length it works just fine with both single and multiplate clutches.
  1. Do you offer core used transmissions, gearsets, or other internal components?
    Sorry, we do not offer used core parts.
Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. Standard Shipping : 3-10 business days
  • If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 25451258882

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Battle Creek, US
★★★★★ 5
Reliable network speed tests and smb speeds
Got this on prime day for about $20 USD. For the price and quality it was definitely worth! Works perfectly and as you would expect. No driver installations or dropped connections so far, just plug and play. Sleek design, gets a little warm (which is expected) but not hot at all. Tested on compatible internal network speeds which showed to be reliable and fast Hardware tested on: - base m4 mac mini connected via usb c ugreen 2.5g adapter - over cat7 ethernet cable (overkill but cat6/cat5e under 100meters/328ft should be enough) - 2.5g ethernet switch - 2.5g port on nas iperf3 tests: - iperf3 tests from base m4 mac mini to another 2.5g device on a 2.5g switch - shows average bitrates of ~2.35 Gbits/sec smb tests from a usb3 connected to base m4 mac mini: - only took ~2mins to transfer 31.31 GB for 11 files in varying sizes - which on average came out to around a transfer rate of 2.087gbps - which is about 260.88 Megabytes per second - i'd imagine this would even be slightly faster for files directly on the mac but wanted to test with a real scenario - probably closer 290-300 Megabytes per second for files stored on the device rather than usb3 have not had a need to test this on mobile yet but iphones with the 10g usbc (and probably just usbc in general) should be fine i'm sure if you're looking into buying one of these you already know all this but some things to keep in mind. your mileage may vary based on your cable length and runs/environment surrounding your network/cables for any electromagnetic interference. but generally as long as you have 2.5gb compatible ports and cabling and you should be good to go!
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Reviewed in the United States on July 11, 2025
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Verified Purchase
pvinthebay
Carnegie, US
★★★★★ 5
Solid USB-C Upgrade for 2.5GbE - Good Value and Performance - Good for Mac Users
I’ve been using this Ugreen adapter for a 6 months now and it’s become one of my go-to accessories. If you have a device like the M1 MacBook Pro or Mac Mini that’s limited to 1Gb Ethernet, this adapter is a great way to unlock faster speeds, especially if you’re upgrading your home or office network to 2.5GbE. I have everything connected to a 10Gb switch after I upgraded my Synology NAS and needed a way to improve access to it for storage. Setup was truly plug and play, just connect the Ethernet cable to one end, plug the USB-C into your device, and you’re good to go. I noticed an immediate improvement in transfer speeds when moving large files to my NAS. This is perfect for anyone working with media or large data sets where Wi-Fi just doesn’t cut it. I was initially capped at 200MB/s. It more than doubled when I used the adapter to 200MB/s At around $20, it’s excellent value when compared to higher-end adapters that cost much more but often deliver the same result. It’s compact, feels well made, and I’ve had zero issues with performance or stability. It does get slightly warm during long transfers, but I haven’t seen any drop in connection quality or speed. If you’re trying to squeeze more speed out of your Mac Mini, laptop, or even a docked tablet, this is a solid upgrade. I keep mine on the desk and switch it between devices as needed. Highly recommended for anyone moving to a 2.5Gb network or needing faster wired performance.
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Reviewed in the United States on July 27, 2025
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Wes Candela
Grantham, US
★★★★★ 5
MR. SULU… PREPARE FOR WARP SPEED. ENGAGE.
Rocket fast. Sleek, smooth design. Have another adapter from different company, which tends to fail when utilizing more than 1.5 GB. It just decides to downshift the first gear. This adapter does not. Speeds are scary. SpeedTest results are fun, watching the gauge being download teat and swing radically to the right. Pinned. Speeds coming in at 2,327 mb/s uploads at 2,150 mb/s (depending on time of day. Great for streaming content from laptop 4K, Dolby Vision Dolby Atmos, no problems… smooth no hiccups
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Reviewed in the United States on May 28, 2026
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ROGER S.
San Leandro, US
★★★★★ 5
Great speed, connection sometimes blocked but there is a solution.
I wanted to take advantage of my 3gb fiber connection, and the best way was to connect my Mac M1 via Ethernet. This looked like a good solution. It started pretty good. I could almost max out my 2.5gb port on my switch. Then a strange thing started happening. At odd, but consistent, intervals, my connection would stop and say it was 'blocked'. If I waited, it would come back to active. If I switched Thunderbolt ports, it would come back instantly. Annoying. After a couple of days trying different ports, cables, DHCP vs static IP, and WiFi working flawlessly, I figured it was something in the Mac. Many Google searches directed me to the Thunderbolt Bridge. Apparently, this feature is to directly connect two Macs together IP for a high-speed connection. But it has been known to cause my issue. I removed the Thunderbolt Bridge service (I can add it back later if needed), rebooted, and have been working great for over a day now. Hopefully, this might help someone in the future.
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Reviewed in the United States on May 24, 2026
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S. A. Hughes
Fort Morgan, US
★★★★★ 4
Installation instructions are flaky, but unit works well when installed
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Reviewed in the United States on March 12, 2026

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