GM Inside - Muscle Cars - Jeep

Support FSC and see no ads! - Click Here
Page 1 of 2 12 LastLast
Results 1 to 20 of 32

thermal linear actuator questions

This is a discussion on thermal linear actuator questions within the Offroad forums, part of the General Discussion category; i got an 88 chevy for a project and the transfercase engauges in 4x4 but the front axle doesnt seem ...

  1. #1
    ZF6LLY ZF6LLY's Avatar
    Join Date
    Sep 2007
    Location
    westchester NY
    Age
    23
    Posts
    695

    thermal linear actuator questions


    Support FSC and see no ads! - Click Here
    i got an 88 chevy for a project and the transfercase engauges in 4x4 but the front axle doesnt seem to
    what do you know about the thremal linear actuators
    i took the actuator out and it moved (maybe an inch how much should they move?) when koeo with the lever in 4wd
    the wires too it were a lil damaged so i cut out the damaged wire and crimp connected them
    also theres a 3 wire connector going into the diff above it idk what that does tho one wire to that was damaged so i fixed that wire aswell

    what are the three wires going into the axel right above it...????
    im guna try to get a wiring diagram but any info would help

    EDIT* my dad and i were messing with it just now and we got it to engauge the lights indicating it was in 4x4 at least which wasnt happing earlier
    it would only light up in drive or reverse not neutral or park is that normal?
    so i go to drive it to see if its really in 4x4 and it wasnt and the lights went out
    idk wtf is going on any ideas?

    this is the truck
    Last edited by ZF6LLY; 10-30-2010 at 04:07 PM.

    formerly gasjob2500hd

  2. #2
    ZF6LLY ZF6LLY's Avatar
    Join Date
    Sep 2007
    Location
    westchester NY
    Age
    23
    Posts
    695

    Re: thermal linear actuator questions

    also what is this?
    they make a like eliminator kit? does that plug leave the axle connected at all times?

    http://www.rockauto.com/catalog/moreinfo.php?pk=1319874

    formerly gasjob2500hd

  3. #3
    Real 4x4s' Rust ryan_thompson87's Avatar
    Join Date
    May 2007
    Location
    Portage La Prairie, Manitoba, Canada
    Posts
    3,042

    Re: thermal linear actuator questions

    Here you go, a whole lot easier and dead reliable.

    http://www.4x4posi-lok.com/app_chevy-k.html
    Last edited by ryan_thompson87; 10-30-2010 at 05:13 PM.

    '87 K30-355 Vortec TBI/TH350/208/Dana 60F/12B/4.56s/37"Bogger/Ult.TBI Mods/XtremeFI FPR with vac. reference/EP241 Pump/LS1 Fans

    07 GMC Sierra Classic - 2" Rough Country Full Leveling Kit/285 Duratracs/Gibson Exhaust/10% Tint/Billet Grille


  4. #4
    No room for my brilliance Honey Bear's Avatar
    Join Date
    Jun 2008
    Location
    Behind you!!!
    Age
    43
    Posts
    2,869

    Re: thermal linear actuator questions

    That actuator is just waiting to die. The thermal units didn't last. Find an electric on either at a junk yard or a dealership.

    Quote Originally Posted by GreaseDog View Post
    you're a big paul bunyan lookin mutha fvcka.. i'd be scared to tell you not to pee in the middle of the back yard and not to leave your beer cans in the shower

  5. #5
    Registered User blackbodylift's Avatar
    Join Date
    Feb 2008
    Location
    Thief River Falls
    Age
    23
    Posts
    414

    Re: thermal linear actuator questions

    Just find the Electric one off a 95+ truck(make sure it's electric since someone could have took swapped the Thermal on onto a newer truck) Just get the Actuator and the plug that plugs into it,then you will have to splice one wire into the T-case. that sensor above the Actuator is the 4wd light indicator that will light the floor shifter light up when in 4.

    1994 Chevy-Sold
    1996 Chevy-Sold.
    1991 Nissan 240sx-Rb25det engine swap, lots of goodies.

  6. #6
    ZF6LLY ZF6LLY's Avatar
    Join Date
    Sep 2007
    Location
    westchester NY
    Age
    23
    Posts
    695

    Re: thermal linear actuator questions

    black body lift the 3 wire connector above the TLA is just for the light?
    so even with this thing moving you guys think it could not be engauging
    if i get a junk yard on off a 95+ what exactly am i splicing a wire to the tcase for? the sensor on the tcase is just a speed sensor is it or is there something on the t case that tells the TLA to engauge?

    the cable kit looks pretty cool but im scared to spend too much money on this truck its got alota problems nd im not sure how much i wanna dump into it/if it will be worth it
    Last edited by ZF6LLY; 10-31-2010 at 10:17 AM.

    formerly gasjob2500hd

  7. #7
    Registered User blackbodylift's Avatar
    Join Date
    Feb 2008
    Location
    Thief River Falls
    Age
    23
    Posts
    414

    Re: thermal linear actuator questions

    Okay I hope I can clear some things up for you.

    First this is what your axle should look like

    Notice the large one is your Actuator, and the small one is your 4WD indicator. That's what your sensor should look like.


    Now this is the Actuator you want to get,I say get it from a junk yard WITH the Harness because if you don't it will get kinda spendy.
    Now for the wire to splice into the T-case I have been trying to dig the Thread up about it but can't seem to find it. But this will help show it needs to be spliced.
    http://www.oreillyauto.com/site/c/de...drive+actuator

    That is a link to the Harness you could buy to install the new actuator,Notice the one wire that's seperate,you need to take the brown wire(not positive) but if my memory isn't ****ing with me it's brown, then run that to the T-case and splice into a sensor(there should be 2 in the t-case) I did it on my '94 but I sold the damn thing so I can't go look at it to help.

    I hope that cleared some up!

    1994 Chevy-Sold
    1996 Chevy-Sold.
    1991 Nissan 240sx-Rb25det engine swap, lots of goodies.

  8. #8
    Registered User
    Join Date
    Jan 2010
    Location
    Plymouth
    Posts
    149

    Re: thermal linear actuator questions

    If the 4x4 isnt working. Jack up the truck all the way around (used jackstand) and have somebody put the lever in 4x4.

    Then unscrew the acuator and use a exension of a socket. Have the person put it in Drive and 4x4 and just idle it. Then take the extension and push the cup in to see if the collar engages. Then you at least know the front diff is workin.

  9. #9
    GearheadDezign.com woody80z28's Avatar
    Join Date
    Oct 2009
    Location
    Walton, NY
    Age
    28
    Posts
    631

    Re: thermal linear actuator questions

    I bought a kit to convert my 94 to an electric actuator with a jumper harness. I wanna say it was around $100, but well worth it.
    80 Camaro Z28 - 550hp AFR 383 EFI / T56 6spd
    91 Beretta "SS" - 220hp 3400 MPFI / HM282 5spd
    94 Silverado Z71 - 300hp Vortec 357 TBI / NV4500 5spd build thread

  10. #10
    Registered User 94'Ole'Blue's Avatar
    Join Date
    Oct 2010
    Location
    Big Rapids Michigan
    Posts
    69

    Re: thermal linear actuator questions

    Hey woody, where'd u buy the kit? I got a 94 that wont engage and dont want to f around with the thermal anymore

  11. #11
    Registered User PaoloMach1's Avatar
    Join Date
    Sep 2009
    Location
    Vicenza, north Italy
    Posts
    26

    Re: thermal linear actuator questions

    Quote Originally Posted by ryan_thompson87 View Post
    Here you go, a whole lot easier and dead reliable.

    http://www.4x4posi-lok.com/app_chevy-k.html
    something cheaper?
    I think this solution can works forever
    1995 K1500 ECSB 4"lift + some crank, 3.73, 285s

  12. #12
    338LapuaMagnum dustingaunder's Avatar
    Join Date
    Sep 2010
    Location
    Oklahoma
    Posts
    53

    Re: thermal linear actuator questions

    I've been looking into mine which is slow to actuate. Looks like the thermal jobies are on the trucks up to '97. My '97 is thermal and can take about 30 seconds to engage in the winter. When I start building it, I'll switch to the motor driven actuator.

    http://www.justanswer.com/uploads/Bl...tor_update.pdf

  13. #13
    Registered User blackbodylift's Avatar
    Join Date
    Feb 2008
    Location
    Thief River Falls
    Age
    23
    Posts
    414

    Re: thermal linear actuator questions

    Quote Originally Posted by dustingaunder View Post
    I've been looking into mine which is slow to actuate. Looks like the thermal jobies are on the trucks up to '97. My '97 is thermal and can take about 30 seconds to engage in the winter. When I start building it, I'll switch to the motor driven actuator.

    http://www.justanswer.com/uploads/Bl...tor_update.pdf
    30 seconds that's it? Mine took up to 2 minutes sometimes..

    1994 Chevy-Sold
    1996 Chevy-Sold.
    1991 Nissan 240sx-Rb25det engine swap, lots of goodies.

  14. #14
    Registered User 1992_1500_4x4's Avatar
    Join Date
    Jul 2007
    Location
    Moose Jaw, saskatchewan
    Posts
    218

    Re: thermal linear actuator questions

    Quote Originally Posted by ryan_thompson87 View Post
    Here you go, a whole lot easier and dead reliable.

    http://www.4x4posi-lok.com/app_chevy-k.html
    : I had the exact same problem that you are, bought this kit and never worry about the 4by not engaging. Every now and then Ill go under the truck just too make sure the cable is tight, and if it isnt, take 5 seconds to tighten it. Very simple and for around $200, inexpensive.
    Last edited by 1992_1500_4x4; 11-02-2010 at 10:10 PM.
    2004 Silverado Z71, 6" procomp, 20's, 35 Toyo M/T, Work in progress DD.
    1992 K1500 RCSB, locked, lifted, built 5.7L. Soon 12valve Cummins and SAS.

    Thanks Brad519 for the sig!

  15. #15
    Registered User 94'Ole'Blue's Avatar
    Join Date
    Oct 2010
    Location
    Big Rapids Michigan
    Posts
    69

    Re: thermal linear actuator questions

    Quote Originally Posted by dustingaunder View Post
    I've been looking into mine which is slow to actuate. Looks like the thermal jobies are on the trucks up to '97. My '97 is thermal and can take about 30 seconds to engage in the winter. When I start building it, I'll switch to the motor driven actuator.

    http://www.justanswer.com/uploads/Bl...tor_update.pdf
    Why where do you buy this "motor driven" actuator? I can't find it anywhere, but the pdf file makes it seem like something i want.

  16. #16
    Registered User blackbodylift's Avatar
    Join Date
    Feb 2008
    Location
    Thief River Falls
    Age
    23
    Posts
    414

    Re: thermal linear actuator questions

    Quote Originally Posted by 94'Ole'Blue View Post
    Why where do you buy this "motor driven" actuator? I can't find it anywhere, but the pdf file makes it seem like something i want.
    http://www.oreillyauto.com/site/c/de...drive+actuator

    There ya go, that's just the actuator.

    http://www.oreillyauto.com/site/c/de...drive+actuator

    there is the harness to wire it into your truck.


    Also, the Electric actuator came in 1995 and newer trucks, My '96 has one(wasn't added on) and a friends '95 has one also.

    1994 Chevy-Sold
    1996 Chevy-Sold.
    1991 Nissan 240sx-Rb25det engine swap, lots of goodies.

  17. #17
    Registered User
    Join Date
    Aug 2008
    Location
    Lanesville, IN
    Posts
    136

    Re: thermal linear actuator questions

    Just to muddy the waters, so to speak...

    My 96 had the thermal actuator. I had it swapped out to the newer "electric" motor actuator - one hell of an improvement.

    If you go to GM parts direct, they list one actuator for 88-96 and show a different actuator for 97-00. Rock Auto also shows different actuators for 96 & 97.

    Good Luck!
    1996 K1500 ECSB 350 5-spd (original owner)
    3.73's, F44, G80, Mag-Hytec Diff Cover, X-tra Leaf, Timbren Kit, Bilstein HDs
    Custom Stainless Duals (Cats Back), Hurst Comp Shifter, K&N Air Filter, HD Clutch
    True Radious Bending - Brush Guard w/ Hella 550's
    Ranch Hand "Cowboy" Rear Bumper

  18. #18
    Registered User 94'Ole'Blue's Avatar
    Join Date
    Oct 2010
    Location
    Big Rapids Michigan
    Posts
    69

    Re: thermal linear actuator questions

    What will i need to do if i have a 94' with a thermal, to be able to run the electric?

  19. #19
    338LapuaMagnum dustingaunder's Avatar
    Join Date
    Sep 2010
    Location
    Oklahoma
    Posts
    53

    Re: thermal linear actuator questions

    Quote Originally Posted by blackbodylift View Post
    30 seconds that's it? Mine took up to 2 minutes sometimes..
    Man, 30 seconds pisses me off. I'd swap it to the motor unit ASAP if it were 2 mins.

    My 97 has a thermal actuator and that service bulletin I posted says they came on trucks through 1997. I wonder why/if some got the better unit and what were the criteria/option codes that got it.
    Last edited by dustingaunder; 11-03-2010 at 06:27 PM.

  20. #20
    Registered User blackbodylift's Avatar
    Join Date
    Feb 2008
    Location
    Thief River Falls
    Age
    23
    Posts
    414

    Re: thermal linear actuator questions

    Quote Originally Posted by dustingaunder View Post
    Man, 30 seconds pisses me off. I'd swap it to the motor unit ASAP if it were 2 mins.

    My 97 has a thermal actuator and that service bulletin I posted says they came on trucks through 1997. I wonder why/if some got the better unit and what were the criteria/option codes that got it.
    Maybe if someone ordered the truck they gave them the option to choose, so for every 88-97 that was just made and not "ordered" just had the Thermal one.

    1994 Chevy-Sold
    1996 Chevy-Sold.
    1991 Nissan 240sx-Rb25det engine swap, lots of goodies.

Page 1 of 2 12 LastLast

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •