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Just smoked a newly rebuilt 4L60e

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Old 05-19-2012, 02:22 PM
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Default Just smoked a newly rebuilt 4L60e

My transmission had about 150k miles on it and started slipping bad. I tore it all apart and rebuilt it along with installing a TransGo HD2 kit. It worked great, better than ever except I could tell the 2-3 shift felt a bit slow and soft. Eventually at WOT it would hit the rev limiter on the 2-3 shift and after a while it has no third gear until I hit about 5k rpm at which point it grabs and goes pretty good (everything else works great, first gear is solid, 1-2 and 3-4 shifts are nice). After pulling the pan off the fluid is dark purple and has quite a bit of clutch matl in it. So I'm either looking at trying to figure out whats wrong and rebuild it again or just buying a new performance transmission. My question is: should a healthy stock transmission with the HD2 kit be able to handle my setup (1.70 60', 112 mph 1/4 mile) or am I pissing in the wind with it?

Thanks in advance!
Old 05-19-2012, 04:11 PM
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a healthy 4l60e should be able to handle that.not stock though.its gonna have to be upgraded for sure.
Old 05-19-2012, 04:20 PM
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My predicament is that I am going to get a new converter with a higher stall and the last thing I want to do is risk rebuilding again, not catching the problem, and sending clutch material thru a brand new converter. It looks like performabuilt has a very reasonably priced 4l60 rated at 500 whp (im guessing im around 400whp) with a one or two year warranty. Its pretty tempting but at $1650 its practically half the price of othets I have seen so it makes me wonder why the big price difference.
Old 05-19-2012, 09:48 PM
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Do you remember what 3/4 clutches you used? Did you just use stock ones from a basic rebuild kit?
(Even stock ones should last reasonably long with your power level.)
Do you remember how big the 3/4 clutch clearance was?
(More than .090 could cause premature failure.)
The 0.093 3rd feel hole drill recommended by Transgo should be enough; I assume you drilled it.
And the BIG question - did you check the 3rd accumulator check ball in the case by the servos? If this leaks, you will burn the 3/4 clutches almost immediately. Lots of first-time rebuilders miss it.
Last, low line pressure and a leaking/worn AFL valve in the valve body will lead to premature 3/4 clutch failure.

IMHO, I would recommend against the cheapest trans from any vendor and go at least one step up from that which will then include some nice upgrades.
Old 05-19-2012, 10:09 PM
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Originally Posted by animuL
My transmission had about 150k miles on it and started slipping bad. I tore it all apart and rebuilt it along with installing a TransGo HD2 kit. It worked great, better than ever except I could tell the 2-3 shift felt a bit slow and soft. Eventually at WOT it would hit the rev limiter on the 2-3 shift and after a while it has no third gear until I hit about 5k rpm at which point it grabs and goes pretty good (everything else works great, first gear is solid, 1-2 and 3-4 shifts are nice). After pulling the pan off the fluid is dark purple and has quite a bit of clutch matl in it. So I'm either looking at trying to figure out whats wrong and rebuild it again or just buying a new performance transmission. My question is: should a healthy stock transmission with the HD2 kit be able to handle my setup (1.70 60', 112 mph 1/4 mile) or am I pissing in the wind with it?

Thanks in advance!
Hi, in order for it to burn up that quick there had to be a problem with the build or kit install, did your transgo HD-2 Kit have the Input Durm 3/4 capsule replacement in it? How much horsepower do you have on this motor? Did you air check the 3/4 Clutch pack at all? Did you replace the EPC Solenoid?
Old 05-21-2012, 11:22 AM
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I used the oem style Raybestos clutches and did not check the clutch pack clearance nor did I air test it. I did however replace the 3/4 capsule. This engine I'm guessing makes around 500hp n/a and I sometimes run a 125 shot. The more I think about it I am tempted to go with a TH400. I see Performabuilt has them, as well as FTI for $1700 and $1500 respectively. Looks like they can handle much more power (1000whp and 800whp respectively), plus they are more efficient. I never drive on the highway so losing OD is not a big deal to me. Id rather have the piece of mind that I'm not pushing the transmission to its limits.
Old 05-21-2012, 11:32 AM
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Originally Posted by animuL
It looks like performabuilt has a very reasonably priced 4l60 rated at 500 whp (im guessing im around 400whp) with a one or two year warranty. Its pretty tempting but at $1650 its practically half the price of othets I have seen so it makes me wonder why the big price difference.
I just installed their stage 2 with a 2800 stall over the weekend. I got their tranny because of the price and good reviews. Give me a few more weeks and I'll let you know what I think of it.

Personally, I can't give up OD b/c I do so much highway driving. If the car isn't your daily driver, or your only vehicle though, I'd say go for it.
Old 05-21-2012, 05:24 PM
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Originally Posted by runtwrestlin
I just installed their stage 2 with a 2800 stall over the weekend. I got their tranny because of the price and good reviews. Give me a few more weeks and I'll let you know what I think of it.

Personally, I can't give up OD b/c I do so much highway driving. If the car isn't your daily driver, or your only vehicle though, I'd say go for it.
I average under 40 miles a week on my car and do very little highway driving so the TH400 is very tempting but I need to go add up all the other items I need to make it work to see where I am at on overall cost to swap to the TH400 vs buying a 4L60e with 700 or 800 hp rating. Mostly I just want what works best for me, not the cheapest but also knowing that I have no plans to make more than 600-700hp I don't see the need to buy the best there is.
Old 05-21-2012, 08:59 PM
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okay, after much debate I'm back to the 4l60e I'm about ready to pull the trigger on a lvl 2 from performabuilt. I can find nothing but good reviews about this company and that's the best selling point imo.
Old 05-21-2012, 09:18 PM
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I have the performabuilt level 2 and love it,the 1-2 shift is nice and the 3-4 is even better..best of all it acts like a stock trans until you go WOT,it will put you in your seat..I am making 525hp with a 120 shot..So for 1800.00 shipped its well worth it..Plus if you break it after the warranty period send it back and for I believe 950.00 you get it rebult like new again..I have gone 10.4 and with 1.42 60ft..
Old 05-21-2012, 10:18 PM
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I think you will be happy with the Performabuilt.

Originally Posted by Leeroyws6
a healthy 4l60e should be able to handle that.not stock though.its gonna have to be upgraded for sure.
You sir need to stop giving advice.
Old 05-21-2012, 10:35 PM
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Originally Posted by 01ssreda4
You sir need to stop giving advice.
lol. I think he means well but basically he says "yes. And by yes I mean no."
Old 05-22-2012, 06:32 PM
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Ordered the Performabuilt lvl 2 4L60e today and trying to decide on a converter but I'm leaning heavily towards a 3800 or 4000 stall FTI hard hit.
Old 05-23-2012, 02:22 PM
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....and converter has been ordered! Can't wait to try this new setup. The last two times I went to the track I couldn't get a single solid pass due to transmission issues.
Old 05-24-2012, 02:25 PM
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Awesome man!
Old 05-24-2012, 05:39 PM
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Good luck. Gotta keep us updated on how the FTI stall works out
Old 11-05-2012, 08:27 PM
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Anyone else have experience with the "Hard Hit" converters from FTI?
Old 11-05-2012, 08:50 PM
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Two days ago was the first time at the track with the ATI... I ran a new pb of 1.77 60' on 3yr old dry rotting nitto 555 street radials. My previous pb was on drag radials and was only 1.84.



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