Tranny slipping - Dodge Cummins Diesel Forum
4th Gen 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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post #1 of 20 (permalink) Old 12-24-2019, 01:03 AM Thread Starter
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Tranny slipping

Hello all,
I have a 2016 68RFE it is slipping second. And i am about to do a full DPF and EGR delete with it, i am going to tune it to 60% top, ( i do not need anymore than that) what is a Cost effective and decent trans to go with. I do not make a whole of money and am looking for my best options. I have had a few diesels but this one is by far the best and most expensive haha

Love it so far.

Thank you for any help


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post #2 of 20 (permalink) Old 12-24-2019, 09:09 AM
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You burnt your clutches on a stock truck?

'18 6.7 S472-5 Blade 2018 Build
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post #3 of 20 (permalink) Old 01-03-2020, 09:38 PM Thread Starter
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I didnít. Whoever had the truck before me did, i just got the truck two months ago.
I am starting to notice a lot of stuff that needs fixed.

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post #4 of 20 (permalink) Old 01-06-2020, 10:32 PM
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What other stuff are we talking about?

2016 Ram 2500 ST CC 4x4, Cummins 6.7, Maximum Steel Metallic
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post #5 of 20 (permalink) Old 01-07-2020, 01:01 PM
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I paid $6495.00 CDN ($4934.10 USD at today's exchange rate) for my 700hp rated NAPC Race HD transmission. Install, billet flex plate and fluid was additional. The revmax 700 is a good transmission as well but they are $8695.00 USD.

NAPC also has a tow series which is rated to stock power but has better clutches, TCC and sonnax overdrive drum priced at $3295 CDN ($2531 USD) and a 450 series rated to 500hp priced at $4395 CDN ($3376 USD).

Some guys do a "Frankenstein" build with a billet dual or triple disc torque converter, sonnax overdrive drum, TCS billet input shaft, BD protect kit or revmax or aftermarket valvebody for higher line pressure and new friction/kolene steel clutches from alto or Raybestos.

Next Gen Diesel also looks like they have some nice transmissions and parts as well. Although I don't have any experience with them so I can't speak to reliability.

'14 3500 SLT CCLB SRW 68RFE 3.42
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post #6 of 20 (permalink) Old 01-17-2020, 12:12 AM
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Don't get me started on the Sonnax input drum... Ughhh...

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post #7 of 20 (permalink) Old 01-17-2020, 12:13 AM
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That sounds kinky! lol

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post #8 of 20 (permalink) Old 01-17-2020, 03:15 AM
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Don't get me started on the Sonnax input drum... Ughhh...
You have issues with it?

'14 3500 SLT CCLB SRW 68RFE 3.42
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post #9 of 20 (permalink) Old 01-17-2020, 11:09 AM
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You have issues with it?
It's not the greatest piece, no, especially for the money. Even the Sonnax engineers I spoke to at SEMA admitted it hasn't performed well in the long run. Sonnax makes some decent stuff, but this one is not my favorite. I have had far better success with a modified OE drum with extra frictions in the OD stack, along with getting the pressures up where you need them to be (tuning/valve body), in applications up to about 500hp. Beyond that power level, I switch do a different drum altogether.

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post #10 of 20 (permalink) Old 01-17-2020, 01:54 PM
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Quote:
Originally Posted by Dynamic View Post
Quote:
Originally Posted by Aaron37 View Post
You have issues with it?
It's not the greatest piece, no, especially for the money. Even the Sonnax engineers I spoke to at SEMA admitted it hasn't performed well in the long run. Sonnax makes some decent stuff, but this one is not my favorite. I have had far better success with a modified OE drum with extra frictions in the OD stack, along with getting the pressures up where you need them to be (tuning/valve body), in applications up to about 500hp. Beyond that power level, I switch do a different drum altogether.
Oh ok, good to know. I believe my 700hp rated transmission is using the sonnax drum. I've only got about 596hp to the wheels. I've had no problems with it so far even beating on it in 5th and 6th quite a bit by rolling on the throttle and not making it downshift. I only have 53,000km's though.

As much as I dislike Revmax I think their anodized input drum is pretty stout. I've heard of quite a few suncoast m3ga drums failing but not very many sonnax.

'14 3500 SLT CCLB SRW 68RFE 3.42
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post #11 of 20 (permalink) Old 01-17-2020, 11:47 PM
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They work fine, until that moment that they don't...

About 250 diesel transmissions leave here every year, and last year almost 1/2 them were 68RFE's. I tried to get behind that Sonnax drum, but had trouble with many of them down the road a bit, especially in setups over 500hp. I have found much better success with other setups, so I quit using them. In my opinion, Sonnax focused on the wrong things when designing that drum.

Just my $.02...

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post #12 of 20 (permalink) Old 01-18-2020, 12:09 AM
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Interesting. What drum do you like best on the market currently? Did the drums you saw that failed have good trans tuning? What design implements do you think they should have changed/made mistakes on?

I'm genuinely curious as to your opinion/knowledge on this subject.
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'14 3500 SLT CCLB SRW 68RFE 3.42
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