*Freight includes shipping BOTH ways and it must be a commercial address with a forklift or extra shipping charges may be applied.
We build a complete transmission that is ready to bolt in and go. All of our Allisons are built the same (clutch pack stackup) whether you're looking for a 1000+RWHP truck or you're looking for a reliable transmission for your 500HP daily driver. Our transmissions have been in multiple trucks well over 1000+RWHP with lots of abuse drag racing, dyno runs and sled pulling all on the same build for a full season. We set them up according to your predicted power level and we can add billet shafts/hub, C3 PTO oiling holes or a pan for the cost of parts. It is preferred to use your current transmission that is in your truck but we do have cores on the shelf which we can build to order.
- Billet Goerend triple disc converter (billet stator options as well)
- Mix of Raybestos GPZ PRO clutches with thick steels and Alto Carbonite
- 2011+ Allision parts for quicker shifts
- Modified Converter flow valve in pump
- Ratiotek parts in pump and valve body
- Sonnex upgrades in pump and valve body
- Transgo Shift kit + reconditioned valve body
- Upgraded shift valve springs in valve body to give us even quicker, smoother shifts than before
- Added oiling holes to clutch packs
- New gaskets + filters w/ Suncoast filterloc kit
- Sleeved factory C2 hub with machined P1 sun gear
- Billet C2 hub is recommended past 650rwhp or you risk damaging splines on the P2 planet
- Billet P2 planet is recommended above 900rwhp
- Billet input and output are extra, recommended above 900rwhp
-Powder coating the cases is $425. If this option is selected, please tell us your color choice in the order comments.
We can have your transmission shipped to us to build, or build one of our cores to your specs and ship it to you. Contact us regarding shipping costs and times. Our fixed rate of $675 is for round trip freight (to you and your core back to us is included) if going to a commercial address with a forklift. If you send your transmission to us on an open pallet, we charge $100 extra for the crate that it will be returned to you with, the transmission must be crated to have insurance on the shipment.
*We recommend that you have us add a Mag-Hytec deep pan or aftermarket transmission cooler if you plan to tow heavy in higher temperature climates.
*The core must come back in rebuild-able condition in order to qualify for the full core refund. This includes but not limited to; planetaries, pump housings, shafts, gears, housings etc. Please allow 4-5 business days for inspection before the core refund begins processing.
26 Reviews Hide Reviews Show Reviews
Awesome customer service, transmission works better than new. I will not hesitate to go back for any other items I need and will refer any Allison owner to them.
I waited to review the rebuild for 1 year to see how the transmission would hold up to over 15,000 miles of heavy hauling, long trips, and a heavy foot. I 100% recommend Scott and his crew to take care of customers with rock solid transmission and Duramax work.
They had my truck in and out of the shop in about 24 hours when I was prepared to leave it for a week. My LBZ and I were taken care of perfectly.
The trans shifts firm and I have no worries about it's function. SDP recommended a few upgrades to the transmission and talked me out of unnecessary expenses that wouldn't benefit me. They also sent me with an extra filter to change after break in and answered all questions I had about my EFI live and heavy towing. I added a 200hp tune and the trans doesn't miss a beat!
I also had SDP upgrade my transfer case pump while the trans was out to save more money and avoid future problems. Do it! These guys are great!
Great tranny,shifts are crisp and customer service is phenomenal. Wouldn't buy any other trans these are top of the line!!
Transmission feels very solid while driving. Have over 10k miles on mine and its been flawless. Best thing I have ever done to my duramax.
Now she shifts like butter. Gives you that slight jerk when the converter engages. Just enough to let you know it’s ready for anything but not violent like some others can be. Won’t let anyone else touch my rig besides SDP. They continue to go above and beyond to make sure their customers are taken care of.
These guys have great customer service , they adjusted their schedule for mine and got me in on a day that they normally would be closed. The truck was in and out of the shop with a new transmission and tunes in just a few hours and I haven't had a single problem with it. The Goerend Torque converter is awesome too! Couldn't be happier with the product and the SDP crew.
Awesome job on the transmission looks great and runs even better. Also a big shout out to Felicia and Scott for the excellent customer service.
Couldn't ask for a better performing transmission, that's why I bought two of them. I have one in my LML and one in my LBZ. Putting down close to 700rwhp and 1200ft lbs of torque in my LML and it hasn't skipped a beat. Helped me dip into the 12s as well. Extremely happy with the transmissions that scott and John put together.
transmission looked great and performed great ordering was easy and shipping was fast thanks Guys and gals for all your hard work