i have 48rtranny in my 2003 ram 5.9 cummins it does not kick down some times. any ideas

 

sounds like an electrical issue man, but aside from that, the 48RE is the weak link of your truck man, i have had nothing but problems with mine. it was slipping and had a full rebuild covered under the warranty, it started doing it again, and at the time i couldnt afford to get a built trans, so i drove with it slipping and not wanting to shift for a good while, and recently ended up getting a fully built trans and no problems what so ever, not saying this is the route to take, but the 48RE has been known to be a piece.... i have one guy i know that has one in his 05...no problems what-so-ever, but thats only one of many.... im gonna ask a few of my buddies for ya, and see if we can get this figured out.. but like i said, sounds electrical, like a solenoid failing...

 

That's not an electrical issue.

The 03 - 04 trucks still had the TV cable that controls the kickdown on the trans. The 04.5+ trucks have the TV solenoid that is controlled electronically.

When you look under the hood, you'll see that black plastic cover on the driver side of the engine. That is the where the throttle cable, cruise control cable and TV (throttle valve) cable join at.

The TV cable is adjustable and needs to be correct for the trans to downshift at the proper time.

The TV cable is the one on the bottom. To adjust it, use a paint marker and mark the current location of the cable and the adjuster.

Remove the TV cable from the bracket by undoing the cable end and pushing on the two detents that hold the square plastic retainer in the bracket. Once it's removed, there is a little plastic cover that needs to be removed. DO NOT force the cover off, it's what holds the cable in adjustment. It hold onto the detents for the TV cable.

Once you remove the plastic cap, you simply slide the cable forward or backwards as necessary to adjust the downshift. Each 1/8" of movement will raise or lower the RPM's that the trans downshifts at by approx 75 RPM's.

You adjust it, test drive, adjust it, test drive, until you get it where you want it.

As for the 48 being garbage, it's not. It's actually a very good trans. The weakest link is the torque converter. In a built form, it's MUCH stronger than an Allison or Torqueshift will ever be. That's why the really high HP Duramax guys switch to the 48 instead of keeping the Allison.

If you don't build it for the power you're making, sure, you'll destroy it.....just like anything else.

 

hi guys thanks alot for all your info,
i want to put more horses in the stable i was thinking of the superchip cortez.

 

The question is....how much extra power do you want?

What do you do with the truck EVERYDAY?

What would you like the truck to do?

And the big question....how much are you realistically willing to spend?

Answer those questions HONESTLY and we can help you get the right parts.

 

its an everyday use truck what i want to do is get down the fuel bill so if i up the ponies i will up torque and cut the fuel bill