Hello,

I am trying to figure out which transmission I am working on. I know it is a 4L60E and I believe it is the 1995 model based on a few things.

1. It has a non-detachable bell housing
2. It has PWM molded on the pump
3. It has a 4 bolt extension housing

I am trying to find a rebuild kit for it. Will buying a kit for any 700R4 or 4L60E (of similar year) work? It seems the only difference between models is minor.

Thanks!

 

https://ls1tech.com/forums/conversio...ns-4l60es.html

 

From the little you have said, it could be a '95, '96 or '97.
Unfortunately the '95 has a unique valve body, set of solenoids and separator plate. Therefore it is best to get a '95-specific rebuild kit if you have a '95. In contrast the same rebuild kit will work with '96 through '05 and some '06. Sorry, I don't know exactly what all the differences are.

The top of the case should have a 4-character tag with the first character being a digit for the year it was built. Alternatively post a color picture of the valve body after removing the oil pan. In particular the color of the connectors on the two rear solenoids will be a clue. I won't be able to tell for sure from such a picture, but hopefully one of the pro builders can. It is important to know what year, especially as a '95 PCM will only control a '95 transmission and not a '96+. Similarly a '96 PCM will not work correctly with a '95 trans.

 

the tag would probably be the best way to find out.

I located the ones on both my 94 and 95 in the location indicated in this pic:

 

Go to: https://www.700r4l60e.com/store/home.php?cat=22 This will give you some choices for the 1995 transmission.

 

Hey guys, sorry for the late reply. I was under the assumption I would get emails when people reply.

Anyway. I found a number cast into the transmission near where fbody_brian mentioned, the number is 24202520. Don't know if this means anything. The tag has been removed by someone at some time. (Not sure why someone would do this...)

Right now I am using a rebuild manual for a 1998 Unit. So far everything has been identical except for the removable bell housing and ONE valve in the valve body. Every other valve has been exactly the same. The valve in question is the valve in the bore for the 3-2 shift solenoid. Here are some images of the valve body, separator plate, and the transmission itself.

https://scontent-a-ord.xx.fbcdn.net/...38480814_n.jpg

https://scontent-a-ord.xx.fbcdn.net/...47011611_n.jpg

https://fbcdn-sphotos-h-a.akamaihd.n...69260451_o.jpg

https://fbcdn-sphotos-f-a.akamaihd.n...84218839_o.jpg

https://scontent-b-ord.xx.fbcdn.net/...74902872_n.jpg

 

that is def not the number you needed to locate. Mine were stamped in the case.
Anyways, pretty surr it's a 95, as the 2-3 solenoid is different between 95 and 96 up

 

Indeed the difference between a '95 and '96 is the 3-2 downshift solenoid and valve. Also separator plate. I don't know these older transmissions personally, but will try to study it from my doco.

EDIT: Confirmed it is a '95; see below

 

I was doing some research, and I believe it is a 95. In the following article..

http://en.wikipedia.org/wiki/Turbo-H...L60E_.2F_4L65E

It says this..

"In 1996, GM introduced a redesigned 4L60E transmission case that incorporated a bolt-on bell (2 piece case, bell and case) housing and an 6 bolt tail housing. This 2 piece case style was first seen in 1996 and up model S-10 Blazer, S-10 Truck, GMC Jimmy, and GMC Sonoma with the 4.3L engine."

This transmission does not have a removable bell housing and it has a 4 bolt tail housing. So I think it is a 95'.

 

Sorry for the delay, but I finally had to time to research this for you.
Based on your separator plate picture, I can confirm it is a '95.
The key is the upper right corner in your picture; 2-1/2" down and 2-1/4" from the far right edge, you have two square holes very close to each other and a tiny hole 1" below that. Those holes do not exist in '96 or later separator plates. There might also be a "MU" identification code stamped in the plate.

As far as I can tell, while the detachable bell housing was introduced in '96, it did not reach all vehicles until '97 and maybe even '98.

 

^^^Nice info. These posts are what makes forums great.

 

the LS1 4l60e had the removable bellhousing. My 97 lt1 had the same looking trans as you. non removeable bellhousing. fyi

 

Thanks a lot!! These forums are indeed great

 

So I have one question. As I said before, I am working with a 1998 Rebuild manual. The one thing I am concerned about is the location of the check ***** when re-assembling the valvebody. Are the location of these check ***** the same as in a 1998 model? I believe I have 7 check *****, plus one that is in the case. I forgot to take a reference photo / notes before removing them. :\

 

Yes, the checkballs are the same. 7 in the VB and one in the case by the 3-4 accumulator. Use vaseline to hold them in place, unless you have "Transgel". Don't use grease as that might hurt the frictions; also vaseline dissolves when it gets hot.

 

I just wanted to say thanks so much for all the information so far.

I ran into a problem I do not quite understand.

Before I state my problem I want to say a few things.

-I did find "MU" on the separator plate as you said.
-This transmission has been rebuild before. I know this because I found a transtec gasket for the oil pump. (Unless they just replaced the pump)

The problem i am having is that the valvebody gasket that came off the unit is different than the one that came in the rebuild kit. The kit was for a 1995 unit. Here are two images showing what I mean.

http://imageshack.us/a/img716/1549/exkl.jpg
http://imageshack.us/a/img842/2757/kpwx.jpg

Can anyone shed some light as to why this would happen, or where I can get this exact gasket?

Thanks!

EDIT: After looking again, I believe I accidentally took the upper gasket when I should have been comparing with the lower. I THINK so anyway, I wont be able to check until next week.

 

Sorry for the slow reply - I was visiting with limited Internet access.

Personally I would simply use the old gaskets as a template and cut the needed holes with an Exacto knife. Any extra holes in the gasket won't matter; make sure every hole in the separator plate has a hole in both gaskets.

Alternatively, you might try the dealer; they might be able to order a set of gaskets for you.

 

1996-97 have a 1 piece bellhousing except in the S10/Blazer...My 1997 suburban has a transmission with this same number on the housing 24202520

 

Are you joking? Your first post is to dredge up a 6 year old post...and your comment doesn't even help solve a problem or clarify any question. You just dump some random numbers and split?

 

Almost got me, made it through half the original post then was like "hmmmm, better check the date"