How can I tell what tranny I have?

[truck]

I want to know if I have the 60e or 80e because the friend I bought the truck from said "it has the heavy duty transmission" but he doesn't know much about this kind of stuff so I would like to find out for myself!

 

[cjman250]

if your truck is a 1500 or half ton, its the 4l60e

 

[someotherguy]

And if it's the "six lug" 2500, same thing. But beyond that, year matters too:

1500/2500LD 1988-1992 700R4/4L60 (no "E")
1500/2500LD 1993-up 4L60E

2500HD/3500 1988-1990 TH400/3L80E
2500HD/3500 1991-up 4L80E

There were also a few early V6 1500's that came with the 3L80E. Easy to spot... 3 speed, no overdrive.

Richard

 

[truck]

Ok thanks for the replies but he made it sound like there was a different transmission put in. Is there anything I could look for that would tell me?

 

[great white]

You must be registered for see images attach

You must be registered for see images attach

 

[thz71]

4l60e has 16 bolts on the pan 80e has 17

 

[DRAGGIN95]

Super easy way to tell, is to look at the main electrical connector, the 4L60E has its connector on the passenger side in a vertical position behind the exhaust heat shield, the 4L80E has it's connector on the drivers side in a horizontal position back behind the shift lever and PRND unit.

 

[truck]

I'll look later today. Thanks for the info gentlemen!

 

[silverado13]

You must be registered for see images attach

You must be registered for see images attach

very nice buddy, my tranny rebuild guide has almost the exact diagram in it, luckily now i dont have to scan and upload it