TRNW-2: 6L90, jmdz torque converter

[Steve Everett]

   I would never reuse an original 6L converter,   it will be worn,  the
tcc apply strategy is what kills them, regardless of application or engine
size,  I wouldn't install anything other than a billet cover converter from
a company you trust either , some people are having good results with
installing a new GM converter and changing the tcc programming though

  Steve

On Wed, Oct 29, 2025 at 5:14 AM John Vanklavern via trnw2 <trnw2 at trnw.net>
wrote:

> *Date:* Wed Oct 29 2:14:23 PDT 2025
> *Subject:* 6L90, jmdz torque converter
>
> I have a 21 chevy hd in the shop with a jmdz converter. I'm wondering what
> you guys are seeing with these in comparison to the jmbx. Are they as prone
> to failure? The main reason I'm asking is because this trans had no fwd
> with ball stuck in plate. When I called customer about it, he wanted me to
> overhaul and update trans anyway. I'm not going to argue with gravy. Trying
> to figure out if I should replace converter or reuse. trans has about 140k
> on it. besides my question, a general discussion about this converter would
> be nice. I understand it is a captive clutch.
>
> John Vanklavern
> Jvk Services Llc
> West Olive, Michigan USA
> TRNW Member Since: 5/23/2025
>
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