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Hello Everyone,
I have a RPM built stage V T56 with a 27 spine output from a 2007 Z51 C6 with ~25k miles. The transmission was swapped with a Z06 gearset when first built by RPM.
It was then rebuilt 5 years ago with lots of new parts (~$2k). About 9 months ago, it was overpowered in my turbo car and chewed the teeth off some gears - roll on in 3rd gear on the street.
I'm running 850rwtq so this was not a surprise. I'm replacing with a TR6060 but I need some advise on the T56.
1) Fixing it will likely cost a couple thousand dollars. I've been told, if fixed, it might be worth $3000-3500. Not sure if that is realistic. I'm not interested in fixing it for $2500 and selling for $2500.
2) I can pull it apart and maybe sell the main shaft or some parts. No idea the extent of the internal damage but I'm sure there is carnage in the case. Also not sure what parts have any significant value?
3) I can try to sell it as is but I'm not sure what a fair price might be?
Anyone have advise? Sell it? Scrap it?
Shifted awesome until it gave up under boost.
Thanks,
Scott
Scary...I'm running stock T56 and upgraded shafts right now at same torque levels. So far no problems. What wheel/tire setup were you running when you lost it? It takes me awhile to hook up even on a roll with ZR1 wheel/tire combo now. That may be why.
We have very similar builds so I wouldn't get too comfortable! I was running 345/30r19 NT05rs. Rolled in 3rd and it spun but the drag radials pull hard instead of just shooting to redline while spinning. I wasn't surprised it let go, but didn't expect it from a 3rd gear roll spinning without wheel hop.
i've heard some parts have value. The mainshafts are getting hard to find. Was hoping for any suggestions? Dump it cheap as a core? Pull some parts and sell (not sure what has value)? Sell complete to someone who wants a project? Or call it a loss and move on?
I would look at what some where like RPM charges for a core and then sell it for a little under that. Or maybe even contact shops like RPM and see if they buy cores.
They're rated in torque not hp actually and I think ~700-800 the vette t56 starts have issues, which is probably close to 1k rwhp for a centri. The high torque turbo setups seem to kill these transmissions much faster.
is that 3rd gear you ripped the teeth off of? surprised. Many guys have put down >1k whp with t56 without issue.
Originally Posted by ysb02
They're rated in torque not hp actually and I think ~700-800 the vette t56 starts have issues, which is probably close to 1k rwhp for a centri. The high torque turbo setups seem to kill these transmissions much faster.
Yep, 3rd gear sheared off all the teeth. Big nasty handful of them in the case.
Turbos will not flow enough to carry power up top but are in efficiency in lower RPM.
Rolled into boost, only 800rwhp, but the torque hit with small turbos is brutal.
Thanks for the advice. I'll see if I can sell it for a core and call it done.
Regards,
Scott
wow that torque curve is insane considering the whp. I make 907whp but 860tq and at 4k rpm you are making like 150lb more torque than me haha. I don't even know how you hook that up on the street. That is really badaz. You're probably making more low end torque than a lot of those >1k whp cars so this makes sense.
zr1 gearset is such an enormous upgrade on these cars, good excuse for the upgrade.
zr1 gearset is such an enormous upgrade on these cars, good excuse for the upgrade.
I hope so. I'm installing a Level VI RPM TR6060 with MH3 ZR1 ratios. Very interested in the tight spread between the gears but it will favor 1/2 mile vs. standing mile events for my car. 5th should do great to ~200mph but will not be enough for the full mile. With the T56, I had already swapped to a 3.18 rear after hitting the limiter in 5th. For now, I'm keeping the 3.18 diff with the ZR1 ratios, so I'll be running 73mph in 1st! Should be interesting.
If you pulled the box apart, you could probably sell a lot of the parts that are still good.
I know I just had to buy a new 5th gear and countergear/synchro hub/slider after destroying mine last weekend
The magnets do a great job of catching debris and certainly the new Tremec gears I had to buy were bloody expensive, most places were selling cheaper aftermarket gears which I wasnt going to risk.
So if you had the patience, there will be people out there needing various parts.
Although if the magnets have done a good job on yours, repairs could be quite reasonable if DIY so at least you could either sell it complete, or even just keep it as a spare.
Yep, 3rd gear sheared off all the teeth. Big nasty handful of them in the case.
Turbos will not flow enough to carry power up top but are in efficiency in lower RPM.
Rolled into boost, only 800rwhp, but the torque hit with small turbos is brutal.
Thanks for the advice. I'll see if I can sell it for a core and call it done.
Regards,
Scott
Here is the curve -
Wow...your curves look almost identical to mine. You are about 50 ft/lbs more at peak torque. Makes me wish I did the tranny swap with the Manic triple I just did last week. Always figured the wheel spin would save the gears but it sounds like your proof it doesn't always work. I think I had quite a bit of clutch slippage as well with the Exidy dual setup based on the hotspots I saw on the clutch and flywheel. I'm on borrowed time
Last edited by TTZ06VETTE; 08-06-2017 at 12:46 PM.
Ask RPM if they'll let you trade the core in as you're buying a new trans from them. They've always been fair to work with.
I ditched my T56 after blowing the third gear syncro and switched to their built 4L60.
07-29-2017, 06:31 PM
Advise Needed - RPM Stage V T56 blew up - Value?
