w3s1c0a5t

iTrader: (3)

Ok so we removed a trans for a friends 99 ecsb 4.8 4l60e

heres the deal we swapped the converter bellhousing and inputshaft into the new trans. Now the converter anbd flexplate are touching with it bolted back up.. I have double checked the converter the thing is snug.. but its still so tight i cant turn it... No idea guys... What should i check?

rickou812

iTrader: (10)

It sounds like you did not get the converter fully seated (splined) in the pump.
Now the bad news, there is a good possibility that if you have tightened the bell housing bolts, you have cracked the pumped..

Gatsby

iTrader: (7)

Do you mean you can't turn the converter? Did you bolt it up? If you did, you can't turn it because the converter hub is pressing against the pump rotor (which is probably broken now). I know this because I just did it like two months ago.

On a 4l60e, you should have about 1.125" (1 1/8) from the bellhousing to the pads where the mounting screws are. Meaning take a straight edge across the bellhousing and measure to the pads. If it's anything more than that (it would probably be significant, like only 5/8" instead of 1 1/8") then you didn't have it seated fully.

If you broke the pump rotor it's not expensive, but it is time consuming and a pain, and I would recommend you let a shop do it (they'll charge $100-200) if it's already out of the car.

I replaced my pump rotor and the misc parts and it was like $60 in parts, but I did a bad job installing it and ended up messing up one of the pump bolt threads and long story short it was bad.

But maybe you're a better mechanic than me (doesn't take much, heh).

w3s1c0a5t

iTrader: (3)

The converter is seated.. .double and triple checked.

With only the bell housing bolts in the converter doesnt have any gap with the flexplate

Gatsby

iTrader: (7)

What type of engine is this going onto? Is it possible that the flexplate is sitting off the block moreso than on an LS1? Maybe you need a different flexplate?

w3s1c0a5t

iTrader: (3)

Its the original flywheel from the truck. and a 4.8. The flexplate has never been undone.

rickou812

iTrader: (10)

Is it the same torque converter from the truck also?

w3s1c0a5t

iTrader: (3)

Yes sir. Everything is from the original. bellhousing input shaft converter and flexplate..

Im lost.

rickou812

iTrader: (10)

If yo have the correct flexplate and torque converter, then the only thing is the converter lugs is not engaged into the pump lugs.

You have three engagement points, the first two are easy the last is more difficult.
1= stator splines
2= input shaft splines
3= pump lugs (what most miss)

If you have no converter clearance = converter not fully seated

I know you said you triple checked, but that is the only variable.

rickou812

iTrader: (10)

BTW, after re-reading your first post, you mentioned you changed the "input shaft"
Are you saying that you actually removed the pump and pulled the entire input drum from one transmission and installed in another?

w3s1c0a5t

iTrader: (3)

The guy didnt change the stator pump./ we changed it out and bolted it up. Thanks guys.

rickou812

iTrader: (10)

If the front pump was removed, there is a possibility that the input drum and/or reverse input drum could have been pulled up as well.
If the input drum and reverse input drum is is not fully indexed and bottomed out, the pump will not fully seat and could cause your symptom as well.

Can you/did you turn the input shaft?

(not the converter, but the actual input shaft)

Out of curiosity, why was the pumps swapped?

Gatsby

iTrader: (7)

Ahhh, I didn't notice the pump swap thing. That would certainly cause it. There's no way to "see" that the pump is fully seated unless you measure it.