48RE hunting

[mfrost]

My 04. 5 with 62K miles hunts between 2nd and third when towing 10k up grade. Have to back off throttle to stop it and I do that fast. No problem with no load. Shifts perfect. Any experience out there with this?

 

[ringneck]

my 05 dose the same,i back out and hope it holds up. pain in the ***

 

[BGlidewell]

some people recommend the GM solenoid upgrade

 

[cerberusiam]

If you have over 40k on the gov solenoid and transducer, change them as a starting point.



The 2-3 hunt can have multiple sources. Verfy front band adjustment to start with. If it does the hunting in relatively single place in the throttle postion and gears you might try modifying the TTVA motor settings for the 05 and newer trucks, adjusting the TV cable for pe-05 ones.

 

[BGlidewell]

for o5 wouldnt you see codes if it was a TTVA issue?
Sonnax - Aftermarket replacement transmission, torque converter, and high performance automotive parts

 

[cerberusiam]

for o5 wouldnt you see codes if it was a TTVA issue?

Sonnax - Aftermarket replacement transmission, torque converter, and high performance automotive parts

No, its not neccessarily a TTVA issue, its a timing issue in how fast the TV pressure and gov pressure get set for the real time situation. Subtle changes in throttle position and load will cause indecision if the affected systems are on a knife edge balance.



The ECU is trying to influence, not control because it can't, hydraulic shifting. Its an electro-mechanical feed back system and there is inherent lag time that does not always get compensated for.



The OP doesn't have a TTVA, but, it still boils down to setting gov pressure to balance TV pressure and there is always subtle errors inherent in this type of system. The only way to cure it is over compensate on one or the other and try to negate the knife edge balance. Advance the TTVA motor 1 tooth or tighten the TV cable to stretch the shift points out seems to help in most cases.



Not all though. The 2-3 shift timing and settings have always been critical on these transmissions and its c=very easy for things to get out of adjustment far enough to throw glitches into the shifting. Band wear, band stretch, pressure leaks, clutch wear, sealing ring wear, TV pressure fluctuations, etc, all can effect the shift timing and you end up with shuttle shift.



The 2-3 shuttle can be the most annoying, hardest to fix glitch in these transmissions.

 

[mfrost]

No, its not neccessarily a TTVA issue, its a timing issue in how fast the TV pressure and gov pressure get set for the real time situation. Subtle changes in throttle position and load will cause indecision if the affected systems are on a knife edge balance.



The ECU is trying to influence, not control because it can't, hydraulic shifting. Its an electro-mechanical feed back system and there is inherent lag time that does not always get compensated for.



The OP doesn't have a TTVA, but, it still boils down to setting gov pressure to balance TV pressure and there is always subtle errors inherent in this type of system. The only way to cure it is over compensate on one or the other and try to negate the knife edge balance. Advance the TTVA motor 1 tooth or tighten the TV cable to stretch the shift points out seems to help in most cases.





Not all though. The 2-3 shift timing and settings have always been critical on these transmissions and its c=very easy for things to get out of adjustment far enough to throw glitches into the shifting. Band wear, band stretch, pressure leaks, clutch wear, sealing ring wear, TV pressure fluctuations, etc, all can effect the shift timing and you end up with shuttle shift.



The 2-3 shuttle can be the most annoying, hardest to fix glitch in these transmissions.

Wow, that is a lot to digest. Will have to get out my CD manual to get an idea what you are talking about. Is the governor selenoid and transducer external to the transmission? Can you get these somewhere besides Dodge and what isthe normal cost? Thanks

 

[cerberusiam]

Is the governor selenoid and transducer external to the transmission? Can you get these somewhere besides Dodge and what isthe normal cost? Thanks

No, both items are internal but are easily changed by dropping the pan. You can but them here A500 42RE A618 46RE 47RE 48RE Transmission governor pressure sensor 56028196AD,Transmission solenoids. The solenoid is in the Accessiories\Related Items panel on the right. The costs are on the page.



Don't overlook band adjustment though as it is critical to make the 2-3 shift work correctly.



There is an upgrade to the stock solenoid that is built better than the OE one from Borg Warner. A Transtar dealer should be able to source it. IIRC, the new part # is 51585.



Or you can go with one of these to help the longevity:

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[mfrost]

No, both items are internal but are easily changed by dropping the pan. You can but them here A500 42RE A618 46RE 47RE 48RE Transmission governor pressure sensor 56028196AD,Transmission solenoids. The solenoid is in the Accessiories\Related Items panel on the right. The costs are on the page.



Don't overlook band adjustment though as it is critical to make the 2-3 shift work correctly.



There is an upgrade to the stock solenoid that is built better than the OE one from Borg Warner. A Transtar dealer should be able to source it. IIRC, the new part # is 51585.



Or you can go with one of these to help the longevity:

#ad

Thanks alot for sharing this information with me. After I get through with my wifes remodeling project i will round up the parts and start on the transmission. this site is great!