TRNW-2: 6L80e performance builds ?

[Steve Everett]

I've seen a couple of kits online advertised as "performance" kits,
 basically the same stuff we use on occasion ,  I'm surprised that kit came
with Raybestos frictions ?   I won't use them in a 6L80, or most anything
else either,  if I have a choice ,  I mainly use B&W ,  Exedy when I have
to,   if we decide to build the unit for this guy I'll use BW frictions,
the billet planet and the billet 4-5-6 hub,  I'm going to give all this
info to the manager and let him work up a price for the guy,  we'll see?
 He's spent money on the engine, maybe he'll be willing to do the same for
the trans ?

   Thanks guys,
                      Steve

On Tue, Oct 21, 2025 at 7:18 AM <jbockus at hiwaay.net> wrote:

> I've done one on a 13 GMC Sierra 4x4 with a supercharged 6.2 producing
> 700 rwhp. The customer supplied their own performance rebuild kit which
> included the Sonnax 4-5-6 hub, Sonnax billet 1-2-3-4 piston, Sonnax HD
> 4-5-6 apply piston kit and a Sonnax Sure-Cure kit. It also came with
> Raybestos clutches and kolene steels and all bushings and bearings. He
> had also ordered a billet torque converter but I forget the stall, he
> wasn't happy with the stall and we ended up replacing the converter with
> a PTC billet converter and I don't remember the stall on it either. He
> originally had someone that I am unfamiliar with tune it and he wasn't
> quite happy, so I referred him to our local tuner, Tommy Blackard who
> works for PTC and he was able to get another 150 HP out of the engine by
> just tuning! This truck is bad-ass! It is his daily driver but he does
> take it to the drag strip on the weekends. I built it about 4-5 years
> ago and it's still running strong. By the way, the Raybestos clutches
> caused a 2-3 squawk which was eliminated with 2 tubes of Lubeguard
> shudder fix.
>
> On 2025-10-21 5:41 am, Fred Whitaker via trnw2 wrote:
> > I have never done any "performance" 6L80's either. But I did the
> > Transgo kit once in a big box truck.  I wasn't all that impressed. It
> > was back when they first came out.  I remember the shifts not
> > matching. (some were almost harsh,while others seemed normal)  That
> > said I didn't HP tune it,which is probably why.
> >   Intermediate shaft (or 456 shaft) is the second thing that comes to
> > mind as weakest link. Torque converter would be #1 and is where I
> > would spend a big part of the money.
> >
> > -------------------------
> >
> > From: trnw2-bounces at trnw.net <trnw2-bounces at trnw.net> on behalf of
> > Steve Everett via trnw2 <trnw2 at trnw.net>
> > Sent: Monday, October 20, 2025 9:02 AM
> > To: Technical Discussion Forum <trnw2 at trnw.net>
> > Subject: TRNW-2: 6L80e performance builds ?
> >
> >   We have an insurance inspector inquiring about his own personal
> > truck,  which has a 5.3 with twin turbos !  I've not done any
> > "peformance" builds on 6L's as of yet, haven't had anyone ask really,
> >   I know there is a heavy duty 4-5-6 hub and shaft, but I thought
> > someone might have come up with some stronger 3/5/r or 1/2/3/4
> > hub/shafts by now ?  but I've not seen any in a quick search,
> > transgo has their tow n pro kit
> >
> >    Anyone done any performance stuff on 6L's ?  what did you use ?
> >
> >    Steve
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