*Freight includes shipping BOTH ways and it must be a commercial address with a forklift
We build a complete transmission that is ready to bolt in and go. All of our Allisons are built the same (clutch pack setups) 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 built to hold up in well over 1000+RWHP trucks 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 to have built to order.
- Billet Goerend or Suncoast 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
- Ratiotec 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
- Billet C2 hub is necessary past 700rwhp or you risk damaging splines on the P2 planet
- Billet input and output are extra
-Powdercoating the cases costs extra and will have to be requested
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 $450 is for round trip freight if going to a commercial address with a forklift.
Posted by Lewis on 1st Feb 2017
So far I have a little over 500 miles on the transmission, and it is night and day between my old one and this one. You can really feel the TC lockup, which the old one you couldn't even tell. They have some amazing cuter service. Scott has answered my calls and questions, and he worked with me on last minute scheduling changes.
Posted by dalton gardner on 10th Jan 2017
Awesome customer service, really helpful and are willing to talk through any questions at all. And this trans build is wicked puts my old BD build to shame.
Posted by Matt Early on 7th Oct 2016
I had this trans installed by SDP at their shop and it shifts very smoothly and doesn't run all the much hotter than stock. 10/10 would recommend
Posted by Jason Drauch on 28th Jul 2016
I did a lot of research before bringing my truck to SDP to build my allison. After talking to Scott and Jake over the phone. There was no question these guys eat breath and sleep Duramax.
It's like a brand new truck, only better. I love hot rodding, power braking, and generally abusing my truck. Also tow 10k lbs a few times a month. Temperatures are the same as when my stock tranny was still good, and i beleive I am getting better fuel mileage. But I havent been able to keep my foot out of the skinny peddle long enough to really find out. This transmission handles everything I have thrown at it. The shifts are solid and the triple disc TC tops it off. I can definitely feel the power hitting the ground now. I would highly recommend SDP to anyone looking for quality and expertise. I drove 4.5hrs to take my truck to them and I would have gone further if I had to. Especially after feeling it.
Posted by brady seiler on 12th May 2016
After getting burned on a "built" transmission from an online forum, I gave Scott a call. Scott tore into it and reported that it was nearly the worst builds he has seen. Many of the clutches were installed backwards and several of the internal parts were destroyed. Scott worked his magic and the transmission now performs flawlessly. All of the shifts are smooth and quick and it has held up to everything I have thrown at it so far.
If anybody is having trouble deciding who to have build your transmission, look no further than SDP. Scott is very devoted to his job and he will make sure you are taken care of, no matter what your performance need is.
Posted by Unknown on 1st Sep 2015
Scott is very knowledgeable and can help with any questions. The products are very high quality and my full trans build has been doing awesome! Very smooth shifts and holds the shifts firm.
Posted by Unknown on 28th Aug 2015
Awesome Transmission! Has been flawless and the converter that Scott helped me choose is perfect! The converter is just loose enough were it starts to really bite were the power comes in.... These guys have another life long customer and would highly recommend them to anyone...
Posted by Dillon on 17th Jul 2015
Would like to Thank all the guys at sdp that made my trans build happen in very short notice!.
Personally thank Scott for really taking care of me and great guy to work with! Wouldn't hesitate to recommend them to anyone.
Got my trans built and have like 2000 miles on it now. No issues at all. Tc locks up great and holds very well. Rather impressed compared to my old trans that slipped under load or on highway pulls.
Will definetly have future purchases with SDP!
Posted by nelson619 on 6th Jul 2015
Allison fully built transmission with billet torque converter courtesy of screamin diesel performance port angeles WA
Very good product and the service is superb Scott really took care professionally did the custom built hes got awesome team up there that can support your project duramax
My allison tranny feels reborn ready to take more power. Thanks SDP!
Posted by Russ on 7th Apr 2015
Well I would personally like to thank Scott and his crew for their hospitality. Love be able to watch them work on my truck and BS them. Trans shifts great. So crisp and fast with no hesitation between gears. I will be coming back for future mods.
Posted by Austin Everett on 6th Mar 2015
Scott at SDP is a great guy to work with. Very personable and VERY knowledgeable on the latest and greatest Duramax/Allison performance products. I came to him, with no reservations, to upgrade my LB7 Allison trans with their full trans build kit. He did it on a Sunday of all days and from start to finish in under 8 hours. I have put around 700 miles on the trans now and it is awesome, to say the least. It shifts smooth and locks up great. Holds my 530whp with absolutely no problem at all. EXTREMELY pleased with the flexibility of Scott at SDP and the excellent workmanship he provides. I would recommend SDP for any of your Duramax performance needs.