I give up

[scotty9794]

Im so over transmission problems with this car. July of 2018 i had this car repaired, i bought it non running. Part of the repairs was a trans rebuild, and a convertor rebuild. Its a jakes stage 4 4l80e with a PCMofNC harness to adapt it. It has a circle d triple billet 3400 stall with it. The damage from the previous owner had melted the trans lines off and he drove it awhile with no fluid. My local shop guy had a local trans guy he knew rebuild the 4l80e. The convertor was sent to circle d for work. I replaced the adapter harness. The trans came back with a clean bill of health. All was reinstalled. I had convertor shudder almost immediately, and it was considered NVH by the shop guy. I put 350 miles on it and the convertor was slipping so bad i couldnt take off on a hill. He agreed it had been shudder, and pulled the transmission. The trans was re gone through, and the convertor redone at circle d. All seemed well, except that my temps were and continue to be high, and my shifts super soft. A line to lube valve from sonnax was installed. Shift firmness was better but not great. Temps went down about 10 degrees. Regular driving give me a temp of 201. It has a 14k btu b&m cooler after the radiator. Well, sunday i drove it to get a haircut, less than 4 miles round trip. During it the convertor is slipping again 650 miles after the last rebuild. Hard to reaccelerate after a round about. I had asked during the first rebuild if the valve body was ok, the car suffered a small fuel fire that destroyed the ecm and tcm harnesses. I was assured it tested fine. I feel as though i have an issue with fluid flow to the convertor, although short of the sonnax valve, i have no idea what feed sthe convertor. I am looking/hoping for some guidance. Im very close to just selling it since its been rebuilt twice in less than 1k miles.

[Sinister10]

consider a TR6060 swap?..

i got tired of the almost exact same issues with the 4L60E in my 2000 TA.. So after the 4th rebuild crapd out, i found a complete T56 swap for the same cost of the auto rebuild, had it back on the road in a weekend.

[bayarea408]

Sounds like an issue with the rebuild shop if its already taking a poop....

I bet they rebuilt it with lack luster parts kit and the forged twin turbo motor is making short work of it. Jakes does sell their kits in packages for people to build as a racing transmission. You taking it to some truck shop they may not be utilizing the correct rebuilding kit for your application.

Maybe there is an issue with loss of fluid do you have a dip stick? some people put them in 4l80 swaps

Maybe have someone glance at the TCM settings regarding line pressure.

[Vegas Bound]

Was the trans done by Jake's in NC or TX?

[scotty9794]

Originally Posted by Sinister10

consider a TR6060 swap?..

i got tired of the almost exact same issues with the 4L60E in my 2000 TA.. So after the 4th rebuild crapd out, i found a complete T56 swap for the same cost of the auto rebuild, had it back on the road in a weekend.

The cost at this point is more than id like to put into it. The thought has crossed my mind though. I think if i was to dump the 4l80 itd be for the 6l90e

[scotty9794]

Originally Posted by bayarea408

Sounds like an issue with the rebuild shop if its already taking a poop....

I bet they rebuilt it with lack luster parts kit and the forged twin turbo motor is making short work of it. Jakes does sell their kits in packages for people to build as a racing transmission. You taking it to some truck shop they may not be utilizing the correct rebuilding kit for your application.


Maybe there is an issue with loss of fluid do you have a dip stick? some people put them in 4l80 swaps

Maybe have someone glance at the TCM settings regarding line pressure.

The guy that rebuilt it had done a couple 4l80s for the local guy i had put it back together for me. It works fine seemingly, but it shifts SO soft. A built trans like its supposed to be should hit ya fairly hard id expect.

It does have a dipstick in it, but it doesnt appear to lose any fluid as the levels always the same and im not seeing any red on my garage floor.

The tune for the tcm was reviewed, but all i know is it supposed to be "good to go"

[scotty9794]

Originally Posted by Vegas Bound

Was the trans done by Jake's in NC or TX?

I dont actually know i guess. There was no tag on transmission. Trans guy said valve body was strange but in callig jakes, they claimed it but i have no clue which one he called. This was the only info i got from the original build on it. The details have been a 50/50 toss up of wether the receipts right since digging into the car from this place, so it wouldnt surprise me either way.

[bayarea408]

Send it to a shop that deals with race cars lol, he looked at the valve body and was confused? lol your twin turbo camaro is at the wrong shop man.

6l90e... alot of cash for not that much reliability, not against against a TMS forged twin car. Drag ZL1's with 6l90e's upgrade too? 4l80E / th400.

[scotty9794]

Originally Posted by bayarea408

Send it to a shop that deals with race cars lol, he looked at the valve body and was confused? lol your twin turbo camaro is at the wrong shop man.

6l90e... alot of cash for not that much reliability, not against against a TMS forged twin car. Drag ZL1's with 6l90e's upgrade too? 4l80E / th400.

This isnt a drag car though. Id rather have street manners than higher et's. The trans guy was confused i guess since the valve body supposedly looked different than typical?? I dunno. Im thinking im gonna drop it and get a new convertor, and valve body. Its about the last things i think of. That and a higher capacity cooler with fan. I was hoping a trans guy might chime in and have some info as i dont know much about the inner working of it.

[Sinister10]

Originally Posted by scotty9794

The guy that rebuilt it had done a couple 4l80s for the local guy i had put it back together for me. It works fine seemingly, but it shifts SO soft. A built trans like its supposed to be should hit ya fairly hard id expect.

It does have a dipstick in it, but it doesnt appear to lose any fluid as the levels always the same and im not seeing any red on my garage floor.

The tune for the tcm was reviewed, but all i know is it supposed to be "good to go"

not necessarily, depends on the converter. My last 60E in my TA was built with a 4400 stall, and under light throttle, you couldnt feel it shift from 1st to 4th. Put your foot down, and the RPMs would stay between 4400 and 6800. The shifts were a little firmer, but not hard by any means.

[scotty9794]

Originally Posted by Sinister10

not necessarily, depends on the converter. My last 60E in my TA was built with a 4400 stall, and under light throttle, you couldnt feel it shift from 1st to 4th. Put your foot down, and the RPMs would stay between 4400 and 6800. The shifts were a little firmer, but not hard by any means.

I mean thats how this one behaves. I could be way off on my expectations. My tahoe has a built 4l60 in it with an oem convertor and its VERY noticeable, even at light throttle. I guess i just assumed this should behave like wise.