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Please excuse long response times! We sincerely want to help you with your build and have you in cue. We are currently setting shop up for installation video shooting, and finishing kit support for 8.25 front diff - Duramax/6.6 Gas, and improved support for product install and DIY parts lists to make this go smoothly for ya'll.
Please excuse long response times! We sincerely want to help you with your build and have you in cue. We are currently setting shop up for installation video shooting, and finishing kit support for 8.25 front diff - Duramax/6.6 Gas, and improved support for product install and DIY parts lists to make this go smoothly for ya'll.

"No-Cut" 4x4 Conversion Adapters for 4L80 Transmission

$595.00
SKU
Description:

 

This is a simple bolt-up solution to convert your 4L80 transmission to 4x4 without cutting the output shaft of the transmission. 

Simply unbolt your 2WD extension housing, bolt up our billet aluminum adapter, a standard 4L80 4x4 extension housing, and your appropriate 261 or 241 transfer case will bolt right up. 

This adapter serves several functions. First, it omits the need to cut down your 2WD output shaft. Next, the adapter pushes your transfer case back an additional 3" to give you a less steep drive-angle (reducing driveshaft feedback), and finally, our adapter reclocks the t-case output slightly up and out, giving you additional clearance over the cross member as well as the transmission wiring harness plug. 

Your transmission will reuse the 32 spline out shaft commonly found on many models, years 1999-2006 (likely other years as well). There are no further modifications required, you've still got your original output shaft, reluctor, and sensor, and power is just now transferred to the t-case. 

We prefer to use a New Process 261 transfer case in our builds because we've found it to be the quietest and most durable. The quiet component of it is pertinent because, in a van, you're just sitting right on top of the t-case with a hole through the floor where the shifter lever comes through (see tips below for additional details)

Fitment Designed for: 

Van Side - 2003-2009 Chevrolet Express 2500/3500/4500 series vans with 4L80 Transmission (4.8L, 6.0L, 6.6L). 

Note - The 4L80 transmission was used as early as 1991 and as late as 2013. We have designed this unit for the years described, but it will likely work on many applications.

Truck Side - This unit is designed to work with a standard 4L80 4x4 extension housing available here, as well as the NP261 transmission. It may work for other models, but this is how we've designed it. 

Tools Required:

Standard hand tools, threadlocker

Included:

Transmission adapter assembly, M10 hardened grade 10 studs, and grade 10 locknuts.

Construction Notes:

Machined solid billet aluminum, Grade 10 hardware

Tips / Skill Level:

1-10 (10 being most difficult) Level 2

This product may work with other model vehicles. 

Torque spec on M10 transmission case bolts and transfer case nuts is 37 Ft-lbs, use threadlocker!

Tip - When installing shift boot for your transfer case, find a heavy piece of rubber slightly larger than the hole, and cut a slit down the middle. Sandwich that between the floor of your van and your floor covering, then install your shift boot over it. This will significantly cut down on road noise and heat loss/gain. 

Shipping, Fulfillment, Taxes, Quality, and Returns
  • Shipping: Our components are carefully wrapped and packaged and ship UPS, USPS, or FedEx, depending on what is available. If you require a particular carrier, please contact us ahead of your purchase.  Customers in Colorado may arrange for in-person pickup within 1-2 business days of purchase. 
  • Shipping/Fulfillment time for components: We typically ship within 1-2 business days of your order and we carefully monitor our inventory. In the event that we are unable to meet that timeframe, we will contact you and arrange either a full refund or a timeframe for fulfillment agreeable to the customer. 
  • Taxes: Colorado residents must pay sales tax of 7.5%, no sales tax is collected on out-of-state shipments currently. 
  • Quality and Returns: We are consistently complimented on the quality of our products and the ease of install. Components are hand-built here almost exclusively in Colorado by seasoned professionals who are fanatics about design and execution. If you are in any way disappointed in the components we will issue a full refund less the cost of shipping when the product is returned. If you decide to return any components that didn't apply to your build or you changed your mind about, shipping and a 15% restocking fee will be deducted from the purchase refund.