PerfectFit™ Powertrain Solutions Custom Engineered & Sourced for Your Needs
TREMEC TR-4050 5-Speed for 4WD
We just got back from Moab, Utah where we debuted the TREMEC TR-4050 5-Speed for 4WD. The TR-4050 is a game changer, the best of both worlds. It has the super low 6.16 1st gear and 6.03 reverse needed to crawl over anything in your way, but it also has a .76 overdrive for traveling the paved miles between your adventures. With 425 lb•ft continuous torque capacity, this transmission was built to climb and tow. Our growing list of supported engines includes: Cummins 4BT, 6BT, 5.0, and R2.8; Ford Windsor SB and Coyote; Chevrolet BB, SB, and LS Series; and Mopar SB and Gen III Hemi. Visit to learn more about this tough transmission!
TJ TREMEC TR-4050 PerfectFit™ Kit
We purchased a 2002 Jeep Wrangler to make our first PerfectFit kit with the TR-4050. With a little help from Advance Adapters, we were able to swap out the old NV3550. Of course, we designed a new STX Shifter for the TR-4050! We have a series of videos and probably many more to come as we #HitTheTrail in our Jeep. Watch the first drive with the old NV3550, and the installation series and more by clicking the image above.
Join the 4WD Newsletter
We like to keep you informed, but we don't want to bore you. We realize that there may be several people who like both 4 wheelin' and muscle cars, we also know that there are some of us that can't drive 55, much less 5! So, if you want to continue to receive news each month about our new 4WD product line, including tech and customer testimonials, just email Misty to be added to the list. Otherwise, while we may mention a new kit occasionally; in this newsletter we're going to stick to classics cars and trucks, muscle cars and hot rods!
Happy Anniversary to SST!
Free shipping to the lower 48 states, international, Hawaii, and Alaska will get a comparable discount. Valid on all complete transmission kits. Not available for Magnum XL or TR-4050 Kits.

Expires May 31, 2019
*Cannot be combined with other offers
SST Turns 5 Years Old!
In May of 2014, we opened the doors and started shipping out PerfectFit™ Kits! Back then, we were thrilled when a customer called, ordered, and the transmission shipped the same day or the next day. It was completely out of the ordinary and unheard of in this business. Now, it's an everyday occurrence for us. We made lots of promises back then, fast shipping, no hassles, operating with integrity, no deposits on transmission kits... things that people just didn't expect from businesses like ours. A few of you put your trust in us, and when we delivered, you told your friends. You sent in testimonials for our newsletter and social media and spread the word at car shows and meets. So, thank you for helping us get to where we are today, we couldn't have done it without you!
Time Warp
We first made the "We're Different" video series about our company and how we operate back in November of 2015. We continue to operate by these standards, in fact, we recently had a customer, Tom, email us and tell us, "Thanks for all the assistance and responses. You truly are a different kind of company. Not what I'm used to in the car world."

If you haven't seen the series yet, click the image and get an inside look at our company.
Customer Testimonials
No Need to Shop Around
Our customer service starts before the sale with the best products, the best service, and the best prices. We also appreciate those who've served our country in the armed forces and we are happy to offer a military discount. Jamie wrote us to tell us why he won't be shopping around:

Thank you for taking my military service into consideration and offering a discount price.

I do believe I will be making the change to the 5-speed, it is just a question of when. I also don't see me going anywhere else, I appreciate all the attention and service you provided and have heard great things about your company. No need for me to shop around elsewhere.

Have a great weekend.
Right in the Sweet Spot
Dennis took his 1969 Dodge Coronet R/T out for a spin and had this to say:

Short first drive today. All is well. Freeway and surface streets. Cruising at about 1950 rpm @ 65 mph. Just a rough estimate but noticably lower. Right in the sweet spot. Less noise and wear, longer range. This with a 3:54 Dana rear. Clutch is nice and light!
Thank you Sir. 
2250 Stock Creek Blvd. Rockford, TN 37853
888-609-0023 •