4l65e pump failure

I had a guy build me this "bulletproof" tranny for $5k and have blown it up 8 times now. It has been under warranty the whole time but I only get to drive it for about two weeks at a time before it takes a crap on me. He keeps telling me that the pump is failing from too much line pressure. The truck has an sts turbo and running predator for my fuel management. I had my tuning file checked and they said that my line pressure was set to stock. He has tried the 10 and 13 vane pump with no difference. Does anybody have some advice that I can give my mechanic......or know of a place where I can get some advice? Thanks in advance for any help!

Where are you located? Tell him you want to swap it for a 4L80e with a shift kit. No more problems.

sounds like hes got 3 washers in the accumulator,thatll cause it to shift hard as a b***c and break alot of things,and add line pressure.did he use the hd 2 kit?my truck in one of the trannies,my mechnic had too take out all but one washer ,to get it too shift easier,and stop breaking things.also there was a thread not long ago,and farmtruck our local tuner said dont use any washers and just up the line pressure through the tune.wich it sounds like predator can do that for you.good luck hope it helps.you can break alot of things if the shiftkit is installed wrong.

Bulletproof? Sounds more like its got a target painted on it.

What has it broke since the initial rebuild? Does it have a shift kit in it? Which one? Billet or Corvette servos?

Thanks for the input on the accumulator washers.....I will have my builder look into that as an option. Soo far on the first builder I burnt up the 3-4 clutch pack, and then also broke an input shaft and reaction shell. I then paid a bunch more for a better build at a very reputable shop. I have since lost 6 or 7 pumps in this setup. Im not real sure what all has been done to it.......He bought the build kit from Raptor transmissions.

to many washers is exactly whats wrong but there is no bulletproof 4l60e i have had 5 to handel 700hp but with 460hp to them i went thru 5 in 2 years get a stock 4l80e with a shift kit it will handel any thing you throw at it

Thank you guys soo much for the advice.....I truly do appreciate it. Im gonna give my mechanic one more opportunity to make it right and then im going 4l80e if he fails.

Tell him to put a line pressure gauge on it. See what the max PSI is.

Also check the converter, could be to short or maybe bad runout.

Chris

Who is installing them? No offense but I've seen more than one pump die in someone else's arms from not having the converter installed all the way when the bell housing bolts are jammed down. I have never heard of any other cause of pump failure besides wear/mileage and tunes and their high pressures break application, input, and output parts...usually not pumps.

A shop has been doing the install......most reputable company in Redding, Ca. The max psi originally was at 56psi I believe thats when he noticed there was a problem. So they originally tried to spring it to compensate for the high pressure. That didn't work so he blamed it on my tuning. I guess whoever did the tuning did adjust line pressures so I had diablo sport set my line pressure to oe spec. I need some parameters on what kind of torque converter I should be running.......Thanks again guys!

56 sounds awful low, shouldn't it be about 300 psi? up to 171 in D and up to 300+ in reverse.

yea that sounds low

1st and reverse are the highest pressure...and the least common failure.

your right every time i had one go out i lost everything but 1st and rev and then rev would go and 1st would barly be there and thin it would go thin the converter would go

Sorry for the bad info then......I dont really know what the line pressure is suppose to be. I just remember the builder telling me that the recommended was only like 28 and that mine was at 56.....that was a long time ago though, its very likely that I misunderstood him or forgot what he said. Those numbers were just stuck in my head, maybe it was 280 and 560? So far it seems like the 3 washers at the accumulator could be my best chance. I will look up the recommended line pressure and have my builder guage it to make sure it is within spec.

i still think you should just do the 4l80 swap

I completely agree actually.......I really regret not doing that in first place. But my warranty is actually up on the tranny and he offered to do this one last build for free so I have to let him try. I basically got screwed over.....after the third tranny I demanded that he upgraded to a 4l80e but he refused. Now my only option is either let him try one more time, or take him to small claims and drag out this process. So after this one fails I will deffenintly swap in the 4l80e. You guys think a stock with a shift kit will do the trick.....or should I spend the extra money and get a finishline or something of that nature? Could you guys also give advice on a good conversion kit for the 4l80e?

A stock 80 with a shift kit should be good for at least 700rwhp. They are tough but you'll lose some power since it is a beefier trans. Some claim up to a 30rwhp loss. But the plus side is you can make a lot more HP and not have to worry about it. There is a sticky on here for what you need to do the conversion. A Transgo shift kit should do the trick.

yea i would say take it to some one els not bashin your guy or anything but he got it wrong that many times