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Go Back   Dodge Cummins Diesel Forum > 07.5 - 09 6.7 Liter Cummins > 07.5 - 09 3rd Gen 6.7L Powertrain
07.5 - 09 3rd Gen 6.7L Powertrain Discussion of components that are directly involved in the power production and all that is needed to get and keep the truck moving . Engine, Transmission, etc...NO ADVERTISING

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Old 04-02-2013, 10:39 PM   #1 (permalink)
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68rfe valve body change

I ordered the hd/towing valve body from REVMAX I have changed trans filters in the past, but am wondering if changing the valve body is DIY kind of thing?
don't really want to pay $250-$300 labor if I can do it myself. Ihear it is fairly easy. Any advice? THANKS
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Old 04-03-2013, 07:32 AM   #2 (permalink)
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I personally have not replaced a VB but watch this video.

Based on your signature it appears that the only modification done to your stock transmission is a TCM from MHP. Is that correct?
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Old 04-03-2013, 08:59 AM   #3 (permalink)
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Yes, replacing the VB is pretty simple. Just make SURE you get the slot in the manual code plate (the part on the VB that moves back and forth when you move the shift lever) correctly aligned with the pin on the manual lever (inside the trans) when you install the new VB. Put the shift lever in PARK before starting. Then on the new VB, slide the code plate all the way rearward, so the detent roller is up against the vertical leg on the plate (this is the PARK position) before installing it, and you should be good.

It can be a little tricky to get the main wiring harness disconnected from the VB (connector on the solenoid module, on top of the VB). The harness connector has a locking lever and a secondary latch. The connector on the solenoid module is square and has two small round posts sticking out of opposite sides of the connector (one towards the front of the vehicle, one towards the rear). The locking lever on the harness (which is probably gray in color) wraps around three sides of the connector. The latch is on the driver's side. The two sides that wrap around have slots that engage with the two posts on the solenoid connector. When the connector is unplugged, the locking lever (latch side) is down (toward the open end of the harness). When you plug it into the trans, the slots engage with the posts. Then, you push the locking lever latch bar up, which rotates the locking lever and clamps the harness connector down into the trans connector (by grabbing and pulling on those posts). I know this is hard to visualize... sorry but I don't have a picture.

To disconnect the harness, you first need to release the secondary lock. This is typically a red plastic piece (on the driver's side of the connector, just below the locking lever latch bar, which will be at the TOP of the connector when it's locked). You'll need to slide this red secondary lock either up or down (I'm not sure which, probably down but I'm not positive) before you can unlock the lever. Once that's done, reach up above and behind the center of the locking lever. The latch that holds the locking lever is just behind the face of the center of the locking lever (there's about 1/4 inch space between them). Put your finger behind the face of the locking lever, and push it and the latch APART. You need to push the latch (the piece just behind the top of the locking lever) in, towards the transmission (away from the locking lever) in order to release it. Once the locking lever pops free, rotate it down as you lift the harness up and off.

When you go to re-connect it, make sure the locking lever is DOWN (towards the open end of the harness connector) so it will engage the posts on the trans connector, then plug it in and rotate the locking lever up til it latches. Then slide the secondary lock into position to retain it.

Good luck!
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Old 04-03-2013, 11:39 AM   #4 (permalink)
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YES that is the only trans. upgrade.
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Old 04-03-2013, 11:44 AM   #5 (permalink)
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How do you plan on wiring it up? Toggle switch or how do you plan on activating it/locking it up? Thanks
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Old 04-04-2013, 11:36 AM   #6 (permalink)
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I'm putting in the HD/TOWING VB not the lock-up. sorry for not giving more info.

Trans Eng. do you have to do a learn when replacing the VB?
Thanks so much for your help.
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Old 04-04-2013, 11:55 AM   #7 (permalink)
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Quote:
Originally Posted by MPC 1 View Post
Trans Eng. do you have to do a learn when replacing the VB?
Yes, technically you should run the QuickLearn procedure (using a scan tool) after replacing the VB. If you can't do that, then I'd advise driving it gently for the first few hundred miles.
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Old 04-13-2013, 06:33 PM   #8 (permalink)
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Valve body change

Can this be done with the trans still in the truck?
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Old 04-13-2013, 09:22 PM   #9 (permalink)
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Originally Posted by Cummins_stalker View Post
I personally have not replaced a VB but watch this video.
68RFE Teardown & inspection - YouTube

Based on your signature it appears that the only modification done to your stock transmission is a TCM from MHP. Is that correct?
At least this one is in English.
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Old 04-14-2013, 06:46 PM   #10 (permalink)
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OMG i laughed so hard at this. Is that you and your paw bro?
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Old 04-14-2013, 08:48 PM   #11 (permalink)
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OMG i laughed so hard at this. Is that you and your paw bro?
Why are you laughing?
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Old 04-14-2013, 08:59 PM   #12 (permalink)
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It just fits your key board personality to a "T". I seriously had to turn it off, the words were killing me, as well as my side.

That sit was funny, i don't care what anybody says. Hell, the dude in the video even had to try and keep his composure. He was wanting to laugh sooo bad.
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