poetman1500

I have a 1998 Chev Tahoe with a 4l60e trans it only has a 1x2 shift I have another trans that came with it with a tag that says 1KCD 24211674 611kcdy29264380 is this the same trans that will work in my Tahoe with out any mods to it ? How do I determine the year of a 4l60e?

clinebarger

A '98 5.0L/5.7L will need a 298mm 4L60E.

I am 99% positive a 1KCD is a 2001 4.8L/5.3L 300mm 4x4 4L60E.

poetman1500

OK what is the meaning of 298mm or 300mm in a 4l60e transmission and what will work in my 98 Tahoe will the trannie That I have in the back of the rig work as it has the transfer case and all there It looks the same as the bad one in the Tahoe

mrvedit

See my pic in post #2 for the three different incompatible types of 4L60E input shafts:

https://ls1tech.com/forums/automatic...s1-4l60-e.html

poetman1500

Well the 4l60e is a 2001 in the bACK OF MY 98 TAHOE AND IT IS MINUS THE TORQUE CONVERTER IT IS A 300MM WITH ABOUT A 7 INCH DISTANCE BETWEEN THE FLANGE THAT BOLTS TO THE MOTOR ANS THE FLANGE THAT BOLTS TO THE TRANSMISSION THE TRANS(4L6OE) IN MY TAHOE IS A 298MM AND HAS THE FLANGE DISTANCE OF ABOUT 6 1/2 INCHES CAN I REMOVE THE BELL HOUSING OFF THE 300MM AND BOLT ON MY 298 BELL HOUSING AND USE THE 298 TORQUE CONVERTER ON THE 2001 300MM TRANS?

mrvedit

No!
Look at how different the input shafts are between a 298mm and 300mm trans.
Obviously the internals of a 298mm and 300mm converter are correspondingly completely different too.

Patrick Taylor

Is 1KCD Same As 6KCD. Both are 4 spd 4x4 .
I have 01 Gmc sierra Sle 5.3 vin T and I bought 5TDD tranny didn't last long not even 100 miles . Waste of my money and was wrong one too I believe. Since mm shaft believe to be different. And went to local people's I know should had went through them first!!! Bought 6KCD was told it the same. Is this right same compatible??

Tranzman

The 1KCD and the 6KCD are both from full sized trucks. They should interchange with each other. Both should have a bell housing casting with 24206952 over the starter pocket. Both should have 300mm input shafts. If the 6KCD has 15 pins in the case pass through it is an ISS model, but will still work in the 2001 vehicle.
The 5TDD unit is for a Trailblazer. My experience with Trailblazer units is they only have a .420 boost valve. They will not have enough pressure rise to clamp the clutches and hold in a full sized truck or Tahoe.
Most used transmissions are just that used and have some wear or 3-4 clutch & 2-4 band distress. Why not just have your original rebuilt?

vorteciroc

Just a word of warning...

Both 1KCD and 6KCD are recycled Broadcast code numbers.

1KCD could be a 2001 or a 2011 unit (the electrical connector in the case is a quick way to tell. Grey =2001, Blue =2011).
6KCD could be a 1996 or a 2006 unit (the input-shafts, stator support, and bell-housing are different).