Rare 4l60e?? I'm confused. .
 

I recently bought a 5.3 with 4l60e Trans from a yard and was told it was out of 2001 truck. I bought a tci converter for it and it would not fit. I start digging and checking numbers on the trans and it looks to be a 99 not an 01. Now everywhere I look online people are saying all 4l60e transmissions that came on LS series motors are the same. Is this an early version that would be different some reason? It has one piece bellhousing and no 12oclock bolt hole and what I belive is 298 mm shaft. Any ideas??

You were told wrong at the junk yard.
You are correct that all LS style 4L60E (other than C5 Vettes) have a removable bellhousing, a bolt hole in the 12 O-Clock position and the 300mm input shaft.
If it has the attached bell housing, it is a '94 or '95 which will be incompatible with any LS PCM.
Sorry for the bad news.

Thanks for the reply. Definitely a 5.3 ls style and the computer and all wiring was included and all wired up. It was pulled right out of the vehicle and straight to me. Just wierd that it has that input shaft

Check the pics out it is one piece removable bellhousing. That's weird right?

Well pics don't seem to have come through for some reason. I'll try again tomorrow

That is the removable bell housing, indicating a '96 or later trans, which is good.
You writing "one piece" confused me; there is no such thing as a 2-piece bell housing for the 4L60E. (Is there for any trans?)

You are correct that it has a 298mm input shaft, which would suggest a '96 or a '97 from a LT-engine car. The 298mm was also used on V6 engines up through '98 or '99 (maybe even a bit later).

Are you saying that LS engine came with that trans bolted on?
If Yes, I would suggest it was someone's hotrod project as I don't think any LS engine came from the factory with a 298mm 4L60E bolted on. (The C5 Vette used a rear-mounted 298 trans without a bell housing.)

In any case, since this clearly is a '96+, it will work perfectly with any LS1 PCM. You will need an "LT" style converter, a spacer and a modified or dual-pattern flexplate. This sticky has much of the needed info:
https://ls1tech.com/forums/automatic...s-spacers.html

My buddy mentioned something about a two piece I'm sure he was mistaken..yes it came attached to the 5.3 motor and was all wired up,13 pin connection. I tossed the converter that came out of it when I got the tci. Wished I wouldn't have now. When I go back and look at the listing for the converter on summit it says 00-06 year range which I thought mine was at the time. Thanks for the help. Only thing that I still don't get is there didn't seem to be any spacer when I took it all apart.

Also are you seeing the pictures I put in my posts because I don't see them when I look at the thread.

If you have a '99 transmission, with removable bell housing, and an input shaft for a 298mm converter, it's likely out of a Tahoe or Suburban and was behind a 5.7 Vortec engine.

FWIW, a '96 or '97 LT transmission would have a 1-piece case (non-removable bell housing). It would have a "K" on the case (truck case), but with the outer ears machined off at the bell housing area for exhaust clearance.

No we can't see any of your pictures.

Call me crazy but maybe the converter isnt right or youre not installing it correctly.

Huh?
I see the pictures. I using the Chrome browser.

On Chrome here and don't see any pics *shrug*

I now wonder if the junk yard just bolted an LT trans to an an LS engine, not knowing any better, and hoping for more money for the combo.
To bolt an LT trans to a "short crank" LS engine, you either need a spacer bolted after the flexplate, a sleeve spacer to extend the nose of the converter, or a custom built converter. In '99 and '00 there were some "long crank" truck LS engines which also would not need a spacer.

I wouldn't put it past them. It just looked like a unit that was straight out of a truck as one. The converter was bolted to the flexplate like it should be when I took it off. I sold the tci to a buddy of mine with an 04 tahoe and it went in just fine. On my motor it lined up with flexplate bolt holes and slid on input shaft ok it's just like the bellhousing was 1/2 inch short when I tried to put the trans back on the motor.

https://cimg3.ibsrv.net/gimg/ls1tech...3d5629536a.png


How i received it all from the yard.

So possible that this is the long crank vesion? Bottom line can it be confirmed this Trans definitely did not come on this motor from the factory?

The last pic shows a Vortec (LS) truck engine. According to Dynamic396 this could have come with the 298mm trans shown in the pics.
I may have to correct my posts - I get the "Vortec" engines mixed up because GM used that term for both LT and LS engines.

Thats an ls trans without a doubt.

With that being said I thought they all had the same input shafts..


https://cimg1.ibsrv.net/gimg/ls1tech...aa5cb9b5ff.jpg