Dana 20 / Park Brake

Discussion in 'Jeep Utility Tech' started by oldtime, Oct 26, 2017.

  1. Oct 26, 2017
    oldtime

    oldtime oldtime

    St. Charles,...
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    I have no books on the FSJ's
    What specific Jeep models and vintages had the Dana 20 with the integral parking brake assemblies ?
     
  2. Oct 26, 2017
    jpflat2a

    jpflat2a what's that noise?

    Riverside CA
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    Jeepster 71 and prior
    Full size Jeeps (Wagoneer, Pickup etc) 71 and prior
    That's from my memory bank.....for what it's worth.
     
  3. Oct 26, 2017
    oldtime

    oldtime oldtime

    St. Charles,...
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    So then no Dana 20 park brake after 1971 ?
    I wonder then if that park brake goes al the way back to the 1962 Gladiator truck ?
    That would be interesting because 1962 was the very first year for the D20.
    HMMM ???
     
  4. Oct 26, 2017
    jpflat2a

    jpflat2a what's that noise?

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    The parts manual doesn't get specific about which Jeep model.
    For the full size Jeep models the manual just lists "all" with 230 232 327 350 engines.
    No late model AMC engines listed, 304, 360 etc.
     
  5. Oct 27, 2017
    oldtime

    oldtime oldtime

    St. Charles,...
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    Thanks Jim,
    So if it was with 230 Tornado engine then it surely begins with Dana 20 equipped Jeeps in 1962.
    I think its pretty definite then that it went with all Dana 20 equipped Jeeps from 1962 and prior to the 1972 AMC engines.
    D20 Jeeps would be the Gladiators, Wagoneers and Commando's.

    I've seen a few D-20 / with park brake that were originally mated to a T98.
    I expect that setup must be from a Gladiaror truck.
    I rather doubt that Commando's and Wagoneers ever used the 4 speed.
    Maybe a few Wagoneers had T98/18's but certainly not the Commando...
    Just Thinking ........

    By the way Jeep T18 on various Jeeps generally begins in 1968. and prior units were T98.
    This change-over from T98 to T18 excludes the CJ's retaining the standard F-134 engines.
    1968 (final year) M715 also retained the T98.
     
  6. Oct 27, 2017
    ITLKSEZ

    ITLKSEZ Volvophilic

    Post Falls, ID
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    This thread needs pictures. I haven't been around a lot of FSJs. I've never seen a parking brake on a D20. Google image search only shows custom units.

    Was it the same drum-style as the CJs? Or a band-clamp design?

    If drum, how much clearance was above it to the floor? That had to prodrude above the height of the t-case, right?

    :watch:
     
  7. Oct 27, 2017
    oldtime

    oldtime oldtime

    St. Charles,...
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    Basically identical to D-18 parking brake.
    I believe the only difference is the special (early style) Dana 20 rear output bearing cap.

    Yes the tunnel height must increase in order to fit it to universal jeeps.
    I plan to mount this brake system in a flat fender jeep so a continuation of this topic was posted here:
    D20 Parking Brake
     
  8. Oct 27, 2017
    47v6

    47v6 junk wrecker! Sponsor

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    Kind of would solve the problem of oil soaked brake shoes like on the D18
     
  9. Oct 28, 2017
    oldtime

    oldtime oldtime

    St. Charles,...
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    So Jim what do the FSJ books say about these two parts ?

    These are two D18 parts that I'm hoping are identical with D20 system.
    912105 Companion Flange
    915892 Operating Lever

    Also do you have the part number for that early D20 rear output casting ?
     
  10. Nov 8, 2017
    colojeepguy

    colojeepguy Colorado Springs Sponsor

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  11. Nov 8, 2017
    oldtime

    oldtime oldtime

    St. Charles,...
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    Yeah I saw that one myself.
    I would be interested if it was a T18 mated to that park brake equipped D20.
     
  12. Nov 8, 2017
    jpflat2a

    jpflat2a what's that noise?

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    There are two different flanges listed with no more info than what I'm showing.
    912105 is listed as being 2.125" long.
    940407 is listed as being 2.594" long.
    Both have the same part description: Flange, Transfer Case Parking Companion

    There is only one operating lever listed and that number is the same as yours above.

    Not surprisingly, the books only list the one rear output housing (same as D18) 992082.
    That number supersedes the early number 933725.

    Parts book confusion ? Certainly there has to be two different rear output housings with or without the drum style parking brake ????
     
  13. Nov 9, 2017
    oldtime

    oldtime oldtime

    St. Charles,...
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    That was great Jim,
    I was able to figure it all out with your help and some additional info in the February 1973 Universal Part Catalog (UPC)

    So hears what I figured. Dana 18 used the same identical rear bearing cap ( #A-9330) from 1942 through 1971.
    The proper companion flange for a Dana 18 is # 912105.

    So # 940407 companion flange must be exclusive to the Dana 20 with a park brake assembly.
    The Dana 20 rear bearing cap (without park brake) is # 933725
    The Dana 20 rear bearing cap (with park brake) is # 992082

    So the only 2 parts different than a typical Dana 18 park brake system are the rear bearing cap and the companion flange.
     
  14. Nov 9, 2017
    jpflat2a

    jpflat2a what's that noise?

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    Well.....don't close the book just yet.
    I got into an older FSJ parts manual and found this:
    933724 Cap and bushing for use with T/case mounted parking brake.
    Maybe an earlier number that changed into the one above in your post ?
     
  15. Nov 9, 2017
    oldtime

    oldtime oldtime

    St. Charles,...
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    Well then obviously the early Parts Lists and the later Parts Catalogues are not in agreement.
    Regardless we do know that the D20 with park brake must have a special rear bearing cap to accept the backing plate and also the lever.

    This one seen on Ebay claims virtually all the part numbers but certainly is not going to do it.

    Jeep Dana 20 Transfer Case Rear Output Housing Assembly OEM 1972 to 1979 | eBay
     

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