Rebuilding A Transmission: Questions & Answers Thread

Discussion in 'General Truck Forum' started by davbell22602, Jan 25, 2010.

  1. davbell22602

    davbell22602 Senior Member

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    Since I have to rebuild my engine in my truck. I was wondering if I should go ahead and rebuild the Sm465 also or should I wait til later?

    Well the PO let somebody use the truck who abused it causing for the rebuild of the engine. So I'm thinking the trany is gonna play the same role in abuse too. I know the person who used it would speed shift it. I have no idea how many miles on are on the trany.
     
  2. hotrodpc

    hotrodpc Senior Member

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    Dave, Dave, DAVE !!! You ever heard the term, If it ain't broke, don't fix it??? Seems you are bringing on alot of projects on yourself and going to get overwhelmed. Its an SM465. Its takes abuse and keeps on going. If its working, not grinding gears and popping out of gears, getting jammed in gears, then its working fine. If you want to do anything to do, drain the flud and put some new in it then leave it alone. One thing about a manual trans going out, in almost all cases, they will never leave you stranded when they go. You may lose a gear, it may pop out of a gear or something like that, but it must be a major catastrophic failure to leave you stranded. So again, if its working, run what you brung !!! JMO
     
  3. davbell22602

    davbell22602 Senior Member

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    Just thought I would ask cause heard some people doing both rebuilds at the same time when doing the engine on a high mileage vehicle.
     
  4. hotrodpc

    hotrodpc Senior Member

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    But what is high mileage on a SM465, 300,000, 500,000??? They go for a long long time.
     
  5. davbell22602

    davbell22602 Senior Member

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    Well a vehicle is considered high in miles after breaking the 100,000 mark.
     
  6. hotrodpc

    hotrodpc Senior Member

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    If someone wanted to sell me a 2006 or 2007 truck that had 100,000 miles on it and sell it cheap cuz it had "high miles" I'd jump on it. 100,000 is not high miles anymore. Its used but not high miles IMO. And it depends on the parts too. I know lots and lots of differentials that have well overe 200,000 and probably never even had an oil change, still going fine. About the same for a SM465. I would not say the same for an auto trans though.
     
  7. davbell22602

    davbell22602 Senior Member

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  8. davbell22602

    davbell22602 Senior Member

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    I'm getting ready to buy the ATSG for the 3T40/125cc and the update book later in the week. That way I can read up on rebuilding my trany in the grand am.
     
  9. hotrodpc

    hotrodpc Senior Member

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    Those are expensive manual for a 1 time use. Here is the other deal about ATSG, they are geared for the transmission rebuilder professional, so I do not recommend them for begginers at all. They are short and brief to the point, without alot of detail. Great for tips, or intechagne info for hard parts, torque specs etc, but you can probably find the torque specs in other places. I'll check a book I have that may have some info on the 3T40/THM125 and see if that book would be good for you. If it does, it will be about the same price as 1 ATSG manual, but covers several differant models of transmisssions.
     
  10. hotrodpc

    hotrodpc Senior Member

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    OK, here is a book, I used years ago. It covers,AMC/Torqueflite which is likely the 904 and 727, Chrylser 404 transaxle, Ford C3 C4 C6 and FMX, Jatco, Ford OD, GM THM 125 transaxle GM 180, THM 200, 350,400 and Powerglide. It is Chiltons Guide to Automatic Transmission Repair. 1974-1980
     

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