Maintenance

[cowski256]

my 1990 d5h transmission overheats after 3 hours running. what would cause this?

[Jevlar]

A common failure on these transmissions is a spool and slug in the valve body that causes low flow through the converter and thus low flow to the cooler.

Updated parts are avaliable.

A pipe inside the transmission case can also crack causing the same problem and is replaced by a hose.

check trnaspump pressure, converter in and out pressure.

[cowski256]

thanks for replying ,would you happen to know the spool and slug part number?what pressure should the pump and in/out converter have?which ports do you check?