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Tcase Question Its a good one I think

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by Monster, Jul 24, 2002.

  1. Monster

    Monster Registered Member

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    My 700R4 Died on me a couple of days ago and it is being rebuilt . But the guys working on it discoverd my T-case is filled with 90 weight gear oil. WHY?????????? Also my 86 K5 Blazer came from Arizona Maybe out there they do that for a reason. One more thing my rear end has a gear ratio of 3.07 Does this sound correct. /forums/images/icons/grin.gif
     
  2. Batmanjr

    Batmanjr 1/2 ton status

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    Yeah, my wife's 87 had 3:07 before I changed to 4:10s! What transfer do you have? If it's a 205? That's what it's supposed to be!!!! If it's a 208, get that sh**** out of there!
     
  3. Monster

    Monster Registered Member

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    Sounds good I have to see what t case it is
     
  4. BLUESMAN

    BLUESMAN 1/2 ton status

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    Seriously doubt that's it an 205 unless someone swapped it in.The 205 never came factory behind an TH700.More than likely it's an NP208,you have an '86 right?No reason to have gear oil in it.No we guys/gals don't put gear oil here in Az.Unless it could be a Northen Az truck,but I've never heard of anyone doing that.Hey I could be wrong!In any case fill it with ATF if it is an NP208.
     
  5. Grim-Reaper

    Grim-Reaper 3/4 ton status Author

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    Your 3.07 gears and 35's are why your Transmission is smoked. You need to get 4.56 gears. Your over working the tranny. It's over heating and you cooked it. You could have regeard for what that tranny rebuild is costing you. That poor tranny is feeling like your dragging a full size bronco behind it every where your going. If you don't have a AUX cooler you need to get one. Heat is what kills tranny's You keep them cool they will last a lot longer. Talk to the tranny shop, they will back up everything.
     

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