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New trans failed

S

supernaut

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I got my th350 trans rebuilt and after about 6 months it started to quickly lose holding power in all gears. Now it runs but doesn't drive. The fluid level looks fine.

I wonder if the torque converter quit? I installed a new one with the rebuild. Isn't there a gauge that I can get to check and see if it is making the right line pressure? That a good place to start?
 
I've had this happen to me twice now, do you know your builder well? I got screwed twice in a row by different shops, both times thinking I had finally found an honest trans shop. Apparently not. Both trannys went out after about 2k miles, the first guy didn't have a warranty, second time I had a one year warranty but the builder ran off to Maryland. The best transmission my truck has ever had came off craigslist, 250$. Next time I have to have a tranny rebuilt I'm doing it myself. It's time to learn.
 
Likely lost the pump or more likely the clutches. Usually caused by not installing the shift kit correctly.
 
to answer your question, yes there is a gauge you can put in line to see if the pump is making pressure. Just went through this with my 4L65
 
You can put a line pressure gauge on the trans but as long as the pump is ok and the converter hub is intact it will still make line pressure even if the converter internals are trashed. I would suggest starting simply by removing the pan and making sure the filter screws have not come loose allowing the trans to suck air. If you don't want to go even that far you can overfill the trans by a quart and that should cover the valve body enough to confirm the filter being loose. I would want to pull the pan anyway to check for debris from a possible failure. It is also possible the turbine spline in the converter failed which will produce little to no debris, give you no forward and reverse and still have good pump pressure.
 
76k5blazerr said:
I've had this happen to me twice now, do you know your builder well? I got screwed twice in a row by different shops, both times thinking I had finally found an honest trans shop. Apparently not. Both trannys went out after about 2k miles, the first guy didn't have a warranty, second time I had a one year warranty but the builder ran off to Maryland. The best transmission my truck has ever had came off craigslist, 250$. Next time I have to have a tranny rebuilt I'm doing it myself. It's time to learn.
Click to expand...


I didn't know the guy well. It was a trans shop. If it need internal repair I'll do it myself. It's been 22 year since tech school though...
 
Greg Ducato said:
You can put a line pressure gauge on the trans but as long as the pump is ok and the converter hub is intact it will still make line pressure even if the converter internals are trashed. I would suggest starting simply by removing the pan and making sure the filter screws have not come loose allowing the trans to suck air. If you don't want to go even that far you can overfill the trans by a quart and that should cover the valve body enough to confirm the filter being loose. I would want to pull the pan anyway to check for debris from a possible failure. It is also possible the turbine spline in the converter failed which will produce little to no debris, give you no forward and reverse and still have good pump pressure.
Click to expand...
Thanks for the info. I did actually drain and fill, replace filter as part of the initial troubleshooting. It's sat for awhile since.

What's the name of the part I need to test line pressure? I guess if I have no/wrong pressure the answer is still the same. Pull trans, get torque converter checked, proceed to disassemble further, fix issue or just get a different trans to replace (one with an overdrive).
 
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