1966 Crown Coupe, 2016 200 S AWD, 1962 Lark Daytona V8.
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Welcome to Allpar. A scan of the TCM portion of the PCM/TCM module might yield some more diagnostic information. A more advanced scan tool like the DRB III (or equivalent) may be needed.
CVI (clutch volume index) values for the clutch elements may be helpful to know, particularly the LR (low reverse) and UD (underdrive) clutch elements which are applied for 1st gear. The clutch fill time ranges are a measure of wear or internal leakage and are an adaptable memory for smooth clutch application.
If you can't get the same 'slip/shudder/bump' sensation in reverse, then the LR clutch may not be the problem and a closer look at the UD clutch may be warranted.
The TCM can also store Event Data which aren't really fault codes and can be read with the scan tool. These are recorded when an anomaly occurs in the transaxle that the TCM can detect and can display sensor values, input and outputs at the time of the occurrence.
ATF+4 is the only fluid that should be used in the 41TE. Clutch wear and damage will occur with any Dexron/Mercon and also some additives.
There are pressure taps along the front of the transaxle case for a pressure gauge if you need to observe line, LR or UD clutch pressure during the clutch 'slip' or 'bump' event. A shudder is usually a slipping clutch and this must be fixed ASAP because clutches don't last very long when this happens.
There was a TCM software upgrade on TSB #21-018-07A that addressed 1-2 and 2-3 shift harshness: https://cda.extra.chrysler.com/sqwrp/files/7283921-018-07.pdf
CVI (clutch volume index) values for the clutch elements may be helpful to know, particularly the LR (low reverse) and UD (underdrive) clutch elements which are applied for 1st gear. The clutch fill time ranges are a measure of wear or internal leakage and are an adaptable memory for smooth clutch application.
If you can't get the same 'slip/shudder/bump' sensation in reverse, then the LR clutch may not be the problem and a closer look at the UD clutch may be warranted.
The TCM can also store Event Data which aren't really fault codes and can be read with the scan tool. These are recorded when an anomaly occurs in the transaxle that the TCM can detect and can display sensor values, input and outputs at the time of the occurrence.
ATF+4 is the only fluid that should be used in the 41TE. Clutch wear and damage will occur with any Dexron/Mercon and also some additives.
There are pressure taps along the front of the transaxle case for a pressure gauge if you need to observe line, LR or UD clutch pressure during the clutch 'slip' or 'bump' event. A shudder is usually a slipping clutch and this must be fixed ASAP because clutches don't last very long when this happens.
There was a TCM software upgrade on TSB #21-018-07A that addressed 1-2 and 2-3 shift harshness: https://cda.extra.chrysler.com/sqwrp/files/7283921-018-07.pdf