• Welcome to The Truck Stop! We see you haven't REGISTERED yet.

    Your truck knowledge is missing!
    • Registration is FREE , all we need is your birthday and email. (We don't share ANY data with ANYONE)
    • We have tons of knowledge here for your diesel truck!
    • Post your own topics and reply to existing threads to help others out!
    • NO ADS! The site is fully functional and ad free!
    CLICK HERE TO REGISTER!

    Problems registering? Click here to contact us!

    Already registered, but need a PASSWORD RESET? CLICK HERE TO RESET YOUR PASSWORD!

4l80E differences???????

THEFERMANATOR

FRANKENBURBAN
Staff member
Lead Moderator
Messages
9,497
Reaction score
3,193
Location
ZEPHYRHILLS FL
Hey ferm how hard would it be to convert a 94 truck to the 95+ cable?
Not to hard. Several have disconnected the mechanical linkage where it comes out at the bottom of the steering column, and used a lokar cable designed to connect to it, then hooked up the other end of the cable to the trans.
 

Osimtnt

New Member
Messages
2
Reaction score
2
Location
Corona, Ca
I have a 95 K3500 with the7.4L and the front pumpblew while towing a trailer up a grade. Anyway, I picked up a 98 4l80e and the only difference is where the trans. fluid lines connect and the size of those lines.Are those high pressure lines and will that swap work?
 

THEFERMANATOR

FRANKENBURBAN
Staff member
Lead Moderator
Messages
9,497
Reaction score
3,193
Location
ZEPHYRHILLS FL
Those are the trans cooler lines. They operate up to 80-100 psi iirc. You used to be able to buy adapters so it was a bolt in swap, but I havent seen them for sale for awhile now. Just be certain to use the correct fittings in the 97+ 4l80e. The rear cooler fitting is special and if you use the wrong fitting fluid will dump to the pan instead of going through the cooler circuit, and you'll burn it up.
 

Osimtnt

New Member
Messages
2
Reaction score
2
Location
Corona, Ca
Thanx
Those are the trans cooler lines. They operate up to 80-100 psi iirc. You used to be able to buy adapters so it was a bolt in swap, but I havent seen them for sale for awhile now. Just be certain to use the correct fittings in the 97+ 4l80e. The rear cooler fitting is special and if you use the wrong fitting fluid will dump to the pan instead of going through the cooler circuit, and you'll burn it up.
Thanx for the priceless info! Those 4l80e's for the 95 k3500 are a rare breed.
 

THEFERMANATOR

FRANKENBURBAN
Staff member
Lead Moderator
Messages
9,497
Reaction score
3,193
Location
ZEPHYRHILLS FL
How hard is it to swap the lines
Not bad. There is 3/8" inverted flare fittings available for the 97+ style trans. Many buy them, get a reducer for the front line, then bend up a line to connect the rear cooler return to the old style in front, and put a 3/8" to 5/16" reducer fitting on it to connect it.
 

Bud Martin

New Member
Messages
3
Reaction score
2
Location
Mt.
91-93 used old style wiring harness, and a different valve body due to a different lockup frequency and eliminiated teh PWM cleaning cycle for 94. 94 is a one year only trans in that it still used the shift shaft for old style mechanical shift linkage, had no bosses for a NSBU, but the new style wiring harness and lockup setup in the valve body. It should also be noted that 91-93 with factory PROMS can not use the newer 94+ lockup solenoid, but uses it's own style(455MHZ VS the 805 of the newer style. Don't quote me on the exact frequencys off the top of my head). 95-96 is just like 94 except they have bosses for the NSBU and the newer style shift shaft for a shift cable instead of mechanical shift linkage. 97 started the rear oiler as it is called where they enlarged the fittings for the cooler lines and made it so one was in the front and one was in the rear. Starting late 99 GM upgraded them again with a solid input shaft, a 1/4" wider band, and a few other internal changes to improve oiling. There were also other running changes through the years to correct problems and failure prone areas, and I'm sure many other things I'm forgetting right now.

Also a 94 trans will fit into any 94 without issue, but cannot be used in a newer truck without finding some way to modify it to accept a NSBU. A 95-96 trans can be used in a 94-96 plug and play so long as you use the correct shift shaft. A 97+ can go into a 96- with afapter lines and fittings and using the correct shift shaft. If you put a 94+ into a 91-93, you either have to use the 91-93 valve body, or get a custom PROM for your controller for the new style lockup solenoid.
Can you enlighten me on the 4l80e converters? what years will this new converter I have for a 94 work in? Possibly a 01 6.0??
 

Husker6.5

135' diagonal 16:9HD, 25KW sound!
Messages
1,898
Reaction score
1,460
Location
Lincoln, NE
No. Input shaft spline count is different, I believe. Iirc the change came with the 2000 model year. Ferm is the transmission expert.
 
Top