47/48RE FAQs
Q: Is there tuning for the 47 or 48RE?
No there is not. While the valve body is electronically controlled, there are no parameters that can be changed via software.
Q: What are these two O-Rings that came with my new transmission?
These O-Rings are for you to re-attach the factory transmission cooler lines. If you have upgraded from factory, you can simply discard them.
Q: Is there a re-learn procedure for the 47 or 48RE?
There is no re-learn procedure for these transmissions; however- you must let the transmission properly break in before feeding 'er the onion. We recommend a 500 mile break in - with a mix of city and highway driving that will let the clutches bed in properly. No towing before 500 miles.
Q: Can I put a Full Manual Valve Body (FMVB) into my stage 1 or 2?
This is not recommended. FMVB's are meant for drivers who are using their trucks for more performance based scenarios- such as Dyno, Drag Racing, Etc) With the increased line pressure our FMVB's create, having one installed in a stock/stage 1 may result in a broken input shaft- if not billet.
Q: When should the band be adjusted?
The band in your transmission should be adjusted as part of every transmission service. For optimal performance and longevity, we recommend performing this adjustment and service every 30,000 miles.
Q: My Transmission is hunting (shuttle shifting) for gears.
This can be caused by a faulty governor pressure solenoid or transducer, improper throttle valve (TV) cable adjustment, bad throttle valve (TV) motor, or worn valve body components. Band mis-adjustment and electrical issues, such as faulty sensors or poor connections, can also contribute. Inspecting and replacing worn components may be necessary.
Q: Can I tow up an incline in 2nd gear in my 47RE?
No, the 47RE does not allow second gear lock-up unless you install a manual lock-up switch. Without it, you’ll need to shift into third gear for hill climbs.Failure to do this will overheat the transmission and you will get either a "Trans Temp" Warning Light or the Overdrive (O/D) light will flash. If the incline is too steep, it’s best to shift the transfer case into low range and continue driving - where your truck will achieve lockup until you reach the top. For newer trucks (’03-’07) with the 48RE, you can manually shift into second gear and achieve lock-up without any modification.