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Username Post: 4L60 to (a later year) 4L65 swap - problems?        (Topic#372546)
Posts: 1

Reg: 02-07-23
02-07-23 12:04 PM - Post#2854230    

(I've read through the related posts on this forum - I don't see this issue addressed. Thanks for input.)

2000 Silverado 4x4 1500 with 5.3L. My 4l60e pump gave out, I purchased another transmission to install. Found out by reading trans sticker that this is a 2001 4l60e, and thought I was getting a good deal for the price of a 4l60e.

My local shop installed the transmission but during test is only getting 1st and 2nd gears, and only occasionally will go up into 3rd when you let off throttle in 2nd. Has never gone into 4th since this transmission was installed.

I have since found that the 4l65e didn't even come out until 2001 and my shop is not aware if the 2000 ECM will be able to run the 4l65e since it wasn't in existence in 2000 year. The salvage man who sold me the transmission (deals only in transmissions) says 'no problem, it's the same as a 4l60 with an extra set of plates for strength.' My shop guy who is trying to program this says his computer doesn't show any 'option' in a 2000 ECM for a 4l65e and is stumped. Any help here? Thanks.

Truck has no OBDII codes and no transmission codes per the scanner. Fluid looks great and the trans came with a warranty by the seller because he 'knows the history" on all of his trans, but I don't want to replace if there is something technical I'm missing.

Valued Contributor
Posts: 3089

Loc: Lake George, NY
Reg: 11-11-15
02-07-23 03:02 PM - Post#2854237    
    In response to BuckeyeBetty e-...

Posts: 2448

Loc: Orlando Florida
Reg: 07-09-18
02-09-23 02:31 PM - Post#2854306    
    In response to BuckeyeBetty

When I had the dealership and repair facility, we had to clean up a lot of these home-brewed swaps.

Depending upon the year and sequence number of the vehicle, the calibrations are different. For instance, one calibration is looking for a certain pressure before enabling a shift, the other calibration is not.

I do not recommend that anyone install a transmission in a vehicle with OBD II, or in most cases OBD I, unless it would be blind to the engine computer.

Sorry, but physically fit and plug in does not equal working properly.

People fear change because it threatens what they know, or what they claim to know.

4dr 57 
"10th Year" Silver Supporting Member
Posts: 4822
4dr 57
Loc: Texas Hill Country
Reg: 11-10-04
02-12-23 09:01 AM - Post#2854407    
    In response to Shepherd

  • Shepherd Said:

OBD2 in 1993? (don't think so) what else isn't correct in this article....where should I start.
See Above reply

It's all good. Mostly

Edited by 4dr 57 on 02-12-23 09:04 AM. Reason for edit: No reason given.

Posts: 2448

Loc: Orlando Florida
Reg: 07-09-18
02-12-23 12:49 PM - Post#2854420    
    In response to 4dr 57

Yeah, 1996 was the mandated first year of OBD II and some makes actually had the unique connector in their 1995 models.

1993 would still be OBD I and for that year, the GM software was fairly sophisticated.

People fear change because it threatens what they know, or what they claim to know.

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