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Thread: Transfer Case Viscous Clutch ?

Transfer Case  Viscous Clutch ? Transfer Case  Viscous Clutch ?
  1. #1
    Super Member Sean Krupa's Avatar
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    Transfer Case Viscous Clutch ?

    I have read all the stickies above but maybe someone can give me some additional advice. I removed the front propshaft yesterday and was going to Dyno it. On the way there the truck would barely move. So I went home and my buddy and I started checking everything and did alot of reading and a few phone calls. With the propshaft in, it is a animal and drives just fine but without the propshaft would barely move.

    I replaced the viscous clutch last year along with the bearing being that it was locked. When I checked it yesterday according to the DaveP procedure it seemed OK. I had a spare new VC for a friend whom I will be rebuilding a spare transfer case and he said I can try his. Same thing would barely move. I heard that once there was a bad batch of VC but its hard to believe that it drives just fine with the propshaft installed.

    Any additional ideas would be much appreciated.
    1993 GMC Typhoon #1215 (10.71@124MPH Stock Bottom End)
    Typhoon 2.0 Build: Forged Internals, Block Fill, 4 bolt, High Compression, Brodix -8 Ported Heads, Custom Cam, Headers, E85, Holley Dominator, Built 4L80e

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    Combating adversyty. Quickstop [UK]'s Avatar
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    Re: Transfer Case Viscous Clutch ?

    If the VC is not there, there is nothing to hold the planetary in place so the truck will just spin that planetary inside the ring gear. If the front prop is gone, the VC is not actually transmitting any torque - it is merely acting as a locking differential.

    With the VC present, if the planetary tries to spin, there is a differential speed because the prop is out and the front output isn't driven. The VC sees a difference and then the force generated, albeit very small, catches up and the two shafts rotate at the same speed. (By acting as this locking diff component) But if the VC has failed and doesn't provide enough resistance, the planetary can spin freely.

    You need that VC intact to lock the diff so power can get from the input shaft, through the locked planetary to the ring gear. No VC = spinning planetary = no drive.

    Your VC is toast. Sorry man.

  3. #3
    Super Member Sean Krupa's Avatar
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    Re: Transfer Case Viscous Clutch ?

    Thanks Mark for the explanation. I'll have to call Cobra Transmission Tuesday and see what they can do. I sure am gettin good at rebuilding these Tcases ��
    1993 GMC Typhoon #1215 (10.71@124MPH Stock Bottom End)
    Typhoon 2.0 Build: Forged Internals, Block Fill, 4 bolt, High Compression, Brodix -8 Ported Heads, Custom Cam, Headers, E85, Holley Dominator, Built 4L80e

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    Junior Member Brianawd's Avatar
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    Re: Transfer Case Viscous Clutch ?

    Hey Sean. Are you headed to the dyno to do some tuning? If so I recommend finding
    A awd dyno to do your tuning. Tuning in rwd the tune will be way off once your back to
    Awd do to the difference in load. Any time you tune on a dyno your tune tends to need
    Some adjusting when back on the street because of more load. But yours will end up
    Being much more off. Just a FYI
    1993 GMC typhoon #1834 best 1/4 12.34@107 stock turbo
    Stock long block.
    2.5in test pipe/3in sportsmachine cat back/TT chip
    80lb/hr injectors/ 5.5gal water/ice box. Sportsmachine heat exchanger
    17 Tundra crewmax limited
    05 evo VIII SSL 548awhp/502awtq.

  5. #5
    Super Member Sean Krupa's Avatar
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    Re: Transfer Case Viscous Clutch ?

    No just goin for a baseline, no Tuning.
    1993 GMC Typhoon #1215 (10.71@124MPH Stock Bottom End)
    Typhoon 2.0 Build: Forged Internals, Block Fill, 4 bolt, High Compression, Brodix -8 Ported Heads, Custom Cam, Headers, E85, Holley Dominator, Built 4L80e

  6. #6
    Super Member Sean Krupa's Avatar
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    Re: Transfer Case Viscous Clutch ?

    So has anyone on here bought a VC and it was bad.
    1993 GMC Typhoon #1215 (10.71@124MPH Stock Bottom End)
    Typhoon 2.0 Build: Forged Internals, Block Fill, 4 bolt, High Compression, Brodix -8 Ported Heads, Custom Cam, Headers, E85, Holley Dominator, Built 4L80e

  7. #7
    PUT YO A$$ INTO IT!!! Syclone#2960's Avatar
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    Re: Transfer Case Viscous Clutch ?

    Im pretty sure the VC in my ty is on its way out too...this could explain the low dyno numbers it made. Makes we wonder how the high Hp/Tq guys are handling it.
    10.4@127mph
    542 rwhp/ 608 Torque. PTE 67-V6.
    E85-TT-408"-AWD/4L80e under construction...

  8. #8
    Super Member Sean Krupa's Avatar
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    Re: Transfer Case Viscous Clutch ?

    I'm wondering the same thing Bruce. These don't last forever, atleast I don't think so. I hope whoever makes these isn't building them different that now they are too loose.
    1993 GMC Typhoon #1215 (10.71@124MPH Stock Bottom End)
    Typhoon 2.0 Build: Forged Internals, Block Fill, 4 bolt, High Compression, Brodix -8 Ported Heads, Custom Cam, Headers, E85, Holley Dominator, Built 4L80e

  9. #9
    Code what? 0966Sy's Avatar
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    Re: Transfer Case Viscous Clutch ?

    Quote Originally Posted by Sean Krupa View Post
    I'm wondering the same thing Bruce. These don't last forever, atleast I don't think so. I hope whoever makes these isn't building them different that now they are too loose.
    What was your source from the one installed, I rebuild a TC for a local guy with one he provided. I have not heard of anything bad with it. But I don't think it gets driven much. I know cobra has them, but his was from a cheaper source.
    91 SY #966
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    92 4dr T15 Jimmy 4x4

  10. #10
    Super Member Sean Krupa's Avatar
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    Re: Transfer Case Viscous Clutch ?

    The 1st one I installed was from Cobra. 2nd one a friend bought since I was guna rebuild a Tcase for him, it was from Allstate for a bit cheaper than Cobra. With the Propshaft installed it drives great and operates as it should. Most people wouldn't have a clue after they replaced the VC unless they removed the Prop and tested to see if it drove fine RWD. I have a feeling these aren't built to the same spec as they used to be.

    FWIW, I'm basically just guna slap the Tcase back in the truck and drive it. Just take it to the track since it's operating as it should with the prop installed and that will give me my "Dyno" numbers.
    1993 GMC Typhoon #1215 (10.71@124MPH Stock Bottom End)
    Typhoon 2.0 Build: Forged Internals, Block Fill, 4 bolt, High Compression, Brodix -8 Ported Heads, Custom Cam, Headers, E85, Holley Dominator, Built 4L80e

  11. #11
    Super Member sytyguy's Avatar
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    Re: Transfer Case Viscous Clutch ?

    Here's some more info on the issue with the Cobra VC's -
    no need to go to another site when the same info is here. The DaveP Viscous Clutch / Transfer Case Test - Sytyadmin
    Last edited by keith455; 05-31-2017 at 07:38 PM. Reason: link to outside site for same info
    Michael Hood - Syclone #1596
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    Super Member Sean Krupa's Avatar
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    Re: Transfer Case Viscous Clutch ?

    Thanks Hood! Im not on that Forum...yet. I talked with Dave again today as I spoke with STE Couplers in Cali. They both basically say the same thing. With these Aftermarket couplers, its a hit or miss. Basically, whoever is building them isn't building them to the specs like back in the day. They are essentially too loose.

    With the 2 Couplers I have now, the Truck still drives great and it works perfectly fine like it should in AWD. Unless I decided to do a smokey burnout then it would be RWD. What I've decided is to use these Aftermarket Couplers and drive it AWD. I will be putting the Ty on a AWD Dyno. I don't "Need" to remove the Propshaft for any reason.

    STE Couplers is the ONLY shop in the US that is dealing with these Couplers and Rebuilding them to GM Spec per say. They Cost $150 and a buddy is guna try it. Dave is also guna talk with STE and figure out a solution and also square up a explanation on exactly how these work and supposed to.
    1993 GMC Typhoon #1215 (10.71@124MPH Stock Bottom End)
    Typhoon 2.0 Build: Forged Internals, Block Fill, 4 bolt, High Compression, Brodix -8 Ported Heads, Custom Cam, Headers, E85, Holley Dominator, Built 4L80e

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    Junior Member Brianawd's Avatar
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    Re: Transfer Case Viscous Clutch ?

    From my experience with AWD cars. Doing a dyno in 2wd
    Is a bad idea. Back in the day before AWD dyno we used to have to
    Install a VC eliminator to dyno in FWD on a DSM. If you did not do
    That it would burn up the VC or damage the center diff.
    1993 GMC typhoon #1834 best 1/4 12.34@107 stock turbo
    Stock long block.
    2.5in test pipe/3in sportsmachine cat back/TT chip
    80lb/hr injectors/ 5.5gal water/ice box. Sportsmachine heat exchanger
    17 Tundra crewmax limited
    05 evo VIII SSL 548awhp/502awtq.

  15. #14
    Super Member Sean Krupa's Avatar
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    Re: Transfer Case Viscous Clutch ?

    Ya I would agree Brian. STE said the way my coupler is operating is "normal". Not supposed to be able to move just RWD. Removing the Prop will in sense try to drive the side with least resistance which would be the front. Dave kinda disagrees with that , obviously guys have driven without Propshaft and Dyno RWD.
    1993 GMC Typhoon #1215 (10.71@124MPH Stock Bottom End)
    Typhoon 2.0 Build: Forged Internals, Block Fill, 4 bolt, High Compression, Brodix -8 Ported Heads, Custom Cam, Headers, E85, Holley Dominator, Built 4L80e

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    Junior Member Brianawd's Avatar
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    Re: Transfer Case Viscous Clutch ?

    If the VC is tight then most likely one could drive in rwd. Or if he VC is seized it would alow one to run
    In RWD as it would make the center diff act like it's welded.
    1993 GMC typhoon #1834 best 1/4 12.34@107 stock turbo
    Stock long block.
    2.5in test pipe/3in sportsmachine cat back/TT chip
    80lb/hr injectors/ 5.5gal water/ice box. Sportsmachine heat exchanger
    17 Tundra crewmax limited
    05 evo VIII SSL 548awhp/502awtq.

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