Just joined? Please introduce yourself.
Classic Edge Designs, LLC Prime Custom Cars, LLC MadMooks
Page 1 of 2 12 LastLast
Results 1 to 10 of 11

Thread: TH350 vs. TH400?

  1. #1
    Registered Member Belair-o's Avatar
    Join Date
    Jun 2013

    Member #:1723
    Location
    Franktown, CO
    Posts
    183

    TH350 vs. TH400?

    Hi, I was prepping to install the speedo bullet housing in the tailshaft of my automatic transmission, and all of a sudden, I am confused about what transmission is in the car. The length of my transmission (21-3/4" from front of bell housing to rear of case) and the pan says it is a TH350:
    IMG_2527.JPG

    But isn't this speedo housing in my trans for a TH400?
    IMG_2528.JPG
    I had purchased a replacement TH350 speedo bullet housing before getting under the car, but now see that won't work. I assume I need to order the seal kit for a TH400, and return the TH350 bullet. Also, I was going to order a replacement driven speedo gear while I was at it, but don't know if the (red) gear like I have is universal, regardless of which trans I have?
    Thanks, Doug

  2. #2
    Registered Member
    Join Date
    Apr 2012

    Member #:571
    Posts
    4,076
    You indeed have a TH350, and for whatever reason it has a TH400 style speedo drive. I don't know the answer to your question, but if you look up speedo gears at a website that sells them, you should be able to answer the question. TCI transmissions is a place that has speedo gears and related info.

  3. #3
    Registered Member Belair-o's Avatar
    Join Date
    Jun 2013

    Member #:1723
    Location
    Franktown, CO
    Posts
    183
    Hi Rick,
    That is pretty weird that they cobbled on the TH400 tailshaft. Thanks for your help.
    Regards, Doug

  4. #4
    Registered Member Troy's Avatar
    Join Date
    Mar 2012

    Member #:516
    Location
    Antioch, Ca
    Posts
    411
    I have a 1968 Truck Turbo 400 in my '55, it has a bullet style speedo drive. Mine isn't in the tail shaft housing it's just up stream of the tail shaft housing in the main case.

  5. #5
    Registered Member
    Join Date
    May 2012

    Member #:625
    Posts
    2,384
    I have seen dozens if not hundreds of Th350s with that style of speedo, they came about in the late 70s when tall highways gears came common. I have switched tailhousings to the early style in the past nothing weird or strange here. The style you have is all I have seen on 700R4s prior to electronic.
    Last edited by markm; 03-23-2020 at 04:38 PM.

  6. #6
    Registered Member Belair-o's Avatar
    Join Date
    Jun 2013

    Member #:1723
    Location
    Franktown, CO
    Posts
    183
    Interesting about the trany configuration variations. I had no idea from cruising the net that there were any variances.
    Regards, Doug

  7. #7
    Registered Member
    Join Date
    May 2012

    Member #:625
    Posts
    2,384
    If I recall the th350s with big speedo drive th350s also have commie metric threads on rear motor mounts etc.

  8. #8
    Registered Member Belair-o's Avatar
    Join Date
    Jun 2013

    Member #:1723
    Location
    Franktown, CO
    Posts
    183
    Quote Originally Posted by markm View Post
    If I recall the th350s with big speedo drive th350s also have commie metric threads on rear motor mounts etc.
    Stinkin' commies!

  9. #9
    Registered Member Belair-o's Avatar
    Join Date
    Jun 2013

    Member #:1723
    Location
    Franktown, CO
    Posts
    183
    FWIW, In case it helps someone down the road, or if I forget (with my oldtimer's disease) and want to know the answer next time I do the task:

    I had asked how much trany fluid should I expect to dump when I pulled the speedo gear housing from my TH350? With the car level, I pulled the housing on a recon effort to see what parts I needed to try and seal the leaks, and dumped about 3 qts. of ATF. After plugging the housing back in the trany, and ordering/receiving the parts, I pulled the housing again, and this time got 1 qt. of ATF.
    Regards, Doug

  10. #10
    Registered Member
    Join Date
    May 2012

    Member #:625
    Posts
    2,384
    Quote Originally Posted by Belair-o View Post
    FWIW, In case it helps someone down the road, or if I forget (with my oldtimer's disease) and want to know the answer next time I do the task:

    I had asked how much trany fluid should I expect to dump when I pulled the speedo gear housing from my TH350? With the car level, I pulled the housing on a recon effort to see what parts I needed to try and seal the leaks, and dumped about 3 qts. of ATF. After plugging the housing back in the trany, and ordering/receiving the parts, I pulled the housing again, and this time got 1 qt. of ATF.
    Regards, Doug
    Had it sat for a while and the convertor drained back the first time.

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
  •