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Custom Dodge Ram Performance Mods - Engine - 5.7 HEMI V8 Discuss modifying your Dodge Ram with Performance Parts and Accessories!
Factory Spec: 5.7-liter HEMI® V8 engine - 390 horsepower, 407 lb-ft of torque.


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  #191  
Old 06-22-2012, 08:57 PM
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i had one on my 45rfe dakota. loved it, shifted hard everytime at WOT for over a year. its a resistor, the pcm wont relearn and go back to stock shift pressure.
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  #192  
Old 06-27-2012, 07:46 PM
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Before I put the sonnax on my trans, when I would cruise the hwy, whenever
I tried to speedup while in lockup, it would feel like my engine was
free revving and the rpm would shoot upwards as if the engine divorced itself from the rest of the vehicle.
Then after about a second it would feel and sound like someone hit me in the back then gears would engage and the vehicle would takeoff.
But ever since I put the sonnax in about 800 miles ago, it has only happened
once .
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  #193  
Old 06-30-2012, 10:40 AM
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I got my Sonnax the other day and I tested it out. It seems to shift faster and a little firmer than stock, but not to harsh. I like the way it shifts. Lets hope it stays like this and the PCM wont learn it.
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  #194  
Old 07-23-2015, 07:57 PM
Daddydaycare Daddydaycare is offline
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Just ordered my sonnax. Looking forward to feeling the change
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  #195  
Old 07-28-2015, 08:28 AM
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I'm still waiting for them to make one for the 65RFE 6 speed.
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  #196  
Old 07-28-2015, 08:36 AM
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Quote:
Originally Posted by HammerHead View Post
I'm still waiting for them to make one for the 65RFE 6 speed.
Anything that works on the 545RFE will also work on 65RFE. These transmissions are identical hardware-wise.
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  #197  
Old 07-29-2015, 06:33 PM
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Quote:
Originally Posted by TransEngineer View Post
Anything that works on the 545RFE will also work on 65RFE. These transmissions are identical hardware-wise.
Thank you for that info; I do have another question tho. I just had my Valve Body worked by Superstreet performance and wanted to know if this would be a good addition to the upgrade they did? Mid to high it digs Very hard and performs very well but I defiantly lost some low end torque. It shifts very fast but not as hard as it did with the stock VB. I see the sonnex increases clutch clamping force to increase torque capacity, was wondering it that would help with my low end loss. Any advice please?
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  #198  
Old 07-30-2015, 07:32 AM
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Quote:
Originally Posted by HammerHead View Post
Thank you for that info; I do have another question tho. I just had my Valve Body worked by Superstreet performance and wanted to know if this would be a good addition to the upgrade they did? Mid to high it digs Very hard and performs very well but I defiantly lost some low end torque. It shifts very fast but not as hard as it did with the stock VB. I see the sonnex increases clutch clamping force to increase torque capacity, was wondering it that would help with my low end loss. Any advice please?
Raising line pressure (and/or increasing clutch capacity) will not correct a low end torque loss.

However, I'm having difficulty understanding how a valve body rework would cause low end torque loss in the first place. I'm thinking that "low end torque loss" means either the engine torque decreased (which a VB rework would not affect), or the shift pattern changed such that you no longer get a kickdown at low speeds. But the shift pattern is controlled by the TCM/PCM, not the VB, so again I don't see how a VB rework would change this.

But in any event, raising line pressure will not increase the engine torque, or change the downshift pattern, so I don't think it would help.
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  #199  
Old 07-30-2015, 08:20 AM
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Quote:
Originally Posted by TransEngineer View Post
Raising line pressure (and/or increasing clutch capacity) will not correct a low end torque loss.

However, I'm having difficulty understanding how a valve body rework would cause low end torque loss in the first place. I'm thinking that "low end torque loss" means either the engine torque decreased (which a VB rework would not affect), or the shift pattern changed such that you no longer get a kickdown at low speeds. But the shift pattern is controlled by the TCM/PCM, not the VB, so again I don't see how a VB rework would change this.

But in any event, raising line pressure will not increase the engine torque, or change the downshift pattern, so I don't think it would help.
Thank you for the response. I still can't make since of it, nothing changed on the truck; I just dropped the VB sent it out and put it back in. The truck doesn't run bad at all but before the VB work I could roast the tires from a 10-15 MPH roll and always had traction issues. But, spinning is isn't winning so maybe it will be a blessing once I hit the track. Thanks agin for the response
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  #200  
Old 07-30-2015, 11:33 AM
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Have you called Jerry an asked him about your problem since the new VB?
Jay
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