1966 Crown Coupe, 2016 200 S AWD, 1962 Lark Daytona V8.
Joined
·
17,304 Posts
If you aren't getting fault codes or 'limp-in' for the speed sensors, they are probably working fine and I wouldn't worry about them.
There were numerous software updates (flashes) for the TCM that vastly improved shift quality and desensitized the module to intermittent faults (erroneous fault codes). It also added enhanced diagnostics and features. Only the finned case TCM's can be flashed. The smooth case TCM's are obsolete.
If you have the newer finned TCM, look for any 'authorized software update' labels under the hood or on the module housing if it's already been done. The module can be flashed to the latest software (part # 4796122(?) as of 11/95) if it doesn't already have it. Replacing the module with a remanufactured TCM may also get you the latest software, but may be more expensive and unnecessary work. If the dealer flashes the TCM with the latest software, have them check for fault codes before the flash and perform a Quicklearn after the flash.
http://www.robskorner.info/faqs/TSB/18-24-95.pdf
The delayed engagement is probably worn seals and clutches and would only be addressed by a rebuild. There have been so many hardware changes and improvements to the transaxle since 1990 that it may be worth considering a remanufactured unit with all the mechanical/hydraulic improvements and upgrades already included.
We wouldn't consider rebuilding something this old at the dealer level and would just install a 'much improved' reman.
You might consider having this work done if the rest of the van is in good shape and would warrant the expense of a transaxle replacement.
There were numerous software updates (flashes) for the TCM that vastly improved shift quality and desensitized the module to intermittent faults (erroneous fault codes). It also added enhanced diagnostics and features. Only the finned case TCM's can be flashed. The smooth case TCM's are obsolete.
If you have the newer finned TCM, look for any 'authorized software update' labels under the hood or on the module housing if it's already been done. The module can be flashed to the latest software (part # 4796122(?) as of 11/95) if it doesn't already have it. Replacing the module with a remanufactured TCM may also get you the latest software, but may be more expensive and unnecessary work. If the dealer flashes the TCM with the latest software, have them check for fault codes before the flash and perform a Quicklearn after the flash.
http://www.robskorner.info/faqs/TSB/18-24-95.pdf
The delayed engagement is probably worn seals and clutches and would only be addressed by a rebuild. There have been so many hardware changes and improvements to the transaxle since 1990 that it may be worth considering a remanufactured unit with all the mechanical/hydraulic improvements and upgrades already included.
We wouldn't consider rebuilding something this old at the dealer level and would just install a 'much improved' reman.
You might consider having this work done if the rest of the van is in good shape and would warrant the expense of a transaxle replacement.
