The G8’s Converter BLEW UP!!! And here’s Why

The G8 has a Circle D converter and for some reason the lockup clutches were so worn out that the converter destroyed itself, Quick R&R and she back to running to the Grocery store!
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[@DuheSpeedShop]

Nice work! Sounding good 👍🏻

[@DAPerform]

Finally back to running good too

[@GodSpeed_376]

Great info and details, thank you for sharing.

[@DAPerform]

Absolutely!

[@code7.62x39]

Would love to see more pov drives of this beauty 🔥

[@hallwayz1]

Love it...

[@michaelelwell8267]

What heater hoses did you use on your G8?

[@jpatrick260]

I use to want a bigger converter but the stock 6l90 has been doing fine for 150k. Ctsv/zl1 converter not big enough?

[@DAPerform]

The car came with the circle d converter but had a sub par trans tune which we think caused the lockup clutches to have too much load and prematurely wear out. Hopefully with the new tune she’ll be good to go

[@TonyTheTruckGuy]

Good work! Did Circle D determine it was an issue with a tune, or failure on their end? Curious if they covered it or if you had to pay to repair it.

[@DAPerform]

Out of pocket since we didn’t buy the converter from him. We did have a torque converter lock up issue but not sure what the culprit was. Could have been the lock up solenoid. Unsure about the converters life before the G8 as well.

[@TonyTheTruckGuy]

@@DAPerform I see. Did you replace the solenoid or have any issues after reinstalling the converter?

[@DAPerform]

@@TonyTheTruckGuysolenoid was replaced with no luck. Went through some other components in the trans and ultimately it was the lock up clutches in the converter that gave way

[@TonyTheTruckGuy]

@@DAPerform Just unlucky with that one I guess then. Thanks for the reply!

[@MAD_BST]

if you can tell me which converter it was i can tell you if its the good one or not. the cheaper ones that circle d suggest i heard break under pressure, you have to get the 1400 dollar triple disk one for it to not break. i hear its the metal in the cheaper ones that cant take it.

[@DAPerform]

07-12-05-2C is the part number. I guess it could be a factor but when the car was purchased it had a poor transmission tune which probably prematurely shortened the lifespan of the converter

[@Tarez205]

Could’ve just cut the old trans lines and tapped into those and re-used those. They’re already routed and big enough

[@DAPerform]

Could have but with the AN line there’s less failure points. Especially since the cut lines would have no flare or anything to hold a hose on them

[@brandonbowman3088]

What code did you get? I wonder if I’m having a similar issue

[@DAPerform]

P0741, I noticed my tc clutch lock up was hard for a few hundred miles before it completely stopped engaging. Figured it was the tune causing the rough lock up but was the clutch itself failing

[@bobbysmith9082]

Do you have the part number for the motor mounts?

[@DAPerform]

SPF-TRC2000

[@kidyoungboy8219]

Could you make your g8 by sound like this and what would you need

[@kidyoungboy8219]

V6

[@DAPerform]

A V8 🤣

[@jaycosby4606]

My Circle D went out after 500 miles. Car has over 170xxx miles but I’m starting to think it’s not a good converter . I could be wrong but that’s just my 2 cents.

[@DAPerform]

Could be more than just a converter. Line pressure plays a big part in converter/transmission life and function

[@finesse6053]

What’s she putting down for rwhp?

[@DAPerform]

It made 412/420 last summer while the radiator hose was popping off after each pull lol.

[@finesse6053]

@@DAPerform that pretty much where mine sits. Currently doing a bunch of suspension upgrades similar to yours recently. How I found you on YT. My PSM 09 g8 GT is at 49k miles currently but those miles don’t help it weigh less 😂

[@pontiacmaniac7772]

I still can’t decide between a Circle D 3000-3200 or a ZL1 converter. I’m about to have my G8 cam swapped for a BTR stage 2 NA.

[@DAPerform]

I would say circle d…more stall and won’t have to worry about any poor vacuum at idle. The btr stage 2 is similar to our custom grind