NewOrleansLT1

The 4L60e in my 94' makes a knocking sound and has NO gears! The only gear that works is park! I was driving then all of a sudden it started knocking and coasted to a stop. Could it be the Trans pump that broke? Or?? It knocks in every gear even park! Anyone??

mrvedit

While that does sound like the trans pump, I don't know if a major problem in the converter could give that symptom.

Do this:
Check the trans fluid level with the engine off.
Then check it again with the engine running; it is doesn't go down by about 1 inch, the trans pump is not working.

NewOrleansLT1

Thanks... I just tried that test. I guess it's the pump...

mrvedit

Sorry for the bad news, but to get 19 years out of that trans is pretty good.

NewOrleansLT1

The trans was rebuilt 4 months ago.. What causes pump failure? This issue gave me no prior warning...

69cutlassrkt

I messed up mine before by me and a friend installing the converter too close to the trans by not spacing it right.
https://ls1tech.com/forums/automatic...p-blow-up.html

mrvedit

Not checking the converter spacing is a common reason. Who installed the trans and converter? If the trans shop rebuilt the trans and installed it, they should warranty this.

NewOrleansLT1

Custom Built Transmission in Marrero, LA. The Transmisson 90 day warranty expired last month. But I'm going in there and LET EM HAVE IT!

performabuilt

iTrader: (25)

As mentions installation error either not seating the pump properly at start or converter to flexplate clearance to high is a common cause of pump failure. Inspecting the pump itself should be easy enough to determine is was either.

NewOrleansLT1

Damn I wish you guys were local lol! I just talked to the Trans guy he said everything was done and measured. But it has to be BS. Would a pump be the only thing to make a knocking sound and shut the WHOLE transmission down? It goes into park so I know nothing is snapped inside..

mrvedit

A snapped input shaft would shut the entire trans down too, but that is very unlikely to happen while just cruising. I'll bet the pump rotor is split due to incorrect converter installation. They may have had an "oops" which cracked the rotor and it then split.

Find out what "social media" there is locally for that shop. Check for yelp, google maps, yahoo and any other review sites. Don't be threatening, but make it clear you like to post online reviews.

NewOrleansLT1

Thanks for the help guys