New tranny at 72000 miles.
#1
New tranny at 72000 miles.
So I'm getting a new tranny and I only have 72000 miles. I have the 45RFE it's costing me $3000 CDN. I took it to the tranny shop cause I thought my T-case was going bad. I could hear this clanking noise under high torque in 1st gear. The tranny shop said it definitly is the tranny and that the 1-2 shift is slow. So he was thinking a bad 1-2 clutch and he reccommended doing the tranny before the problem gets worse so I agreed. Did I do the right thing or should have maybe just lived with it. This tranny shouldn't be gone already should it ? I thought this was the best tranny.
#2
#3
Effects of Bad Engine Sensor Inputs on the Transmission
Because the transmission needs to know engine speed and load as well as vehicle speed to pick the right shift points, a bad sensor input or loss of a signal can create real problems for the transmission computer.
The throttle position sensor signal takes the place of the throttle kickdown linkage on older mechanical automatics. So if the TPS is reading high or low, or has a dead spot, it can affect transmission kickdown shifts when accelerating, as well as normal upshifts and downshifts, too. If the TCM cannot get a good TPS signal, it may substitute a "calculated" throttle angle provided by the PCM over the data bus. Or, if this signal is not available, it may substitute a fixed value for the TPS signal. This will obviously affect the way it shifts (transmission typically hunts for shift points) but not necessarily cause it to go into a limp-in mode.
A faulty throttle position sensor will not always set a fault code. The PCM has to be smart enough to figure out when the TPS is working properly and when it is not. Its diagnostic strategies may compare the TPS signal against engine rpm, MAP signal and/or airflow to determine if the TPS signal makes sense. If the TPS signal does not correspond to other sensor inputs that can be used to measure engine load, the PCM may set a fault code. Then again, it might not. It all depends on the self-diagnostic strategy, how sensitive it is to faults and how easily the PCM can detect problems.
here is where i pulled this info from. check the rest out : http://www.aa1car.com/library/2002/us90224.htm
Also, a rebuilt tranny is not the same as a new tranny. They will re-use almost every pasrt other than what may have excessive wear. if they don't find anything, they will start to guess. I'd make sure all new clutch packs are put in and have your 2nd prime gear changed as well.
Because the transmission needs to know engine speed and load as well as vehicle speed to pick the right shift points, a bad sensor input or loss of a signal can create real problems for the transmission computer.
The throttle position sensor signal takes the place of the throttle kickdown linkage on older mechanical automatics. So if the TPS is reading high or low, or has a dead spot, it can affect transmission kickdown shifts when accelerating, as well as normal upshifts and downshifts, too. If the TCM cannot get a good TPS signal, it may substitute a "calculated" throttle angle provided by the PCM over the data bus. Or, if this signal is not available, it may substitute a fixed value for the TPS signal. This will obviously affect the way it shifts (transmission typically hunts for shift points) but not necessarily cause it to go into a limp-in mode.
A faulty throttle position sensor will not always set a fault code. The PCM has to be smart enough to figure out when the TPS is working properly and when it is not. Its diagnostic strategies may compare the TPS signal against engine rpm, MAP signal and/or airflow to determine if the TPS signal makes sense. If the TPS signal does not correspond to other sensor inputs that can be used to measure engine load, the PCM may set a fault code. Then again, it might not. It all depends on the self-diagnostic strategy, how sensitive it is to faults and how easily the PCM can detect problems.
here is where i pulled this info from. check the rest out : http://www.aa1car.com/library/2002/us90224.htm
Also, a rebuilt tranny is not the same as a new tranny. They will re-use almost every pasrt other than what may have excessive wear. if they don't find anything, they will start to guess. I'd make sure all new clutch packs are put in and have your 2nd prime gear changed as well.
Last edited by dirtydog; 11-27-2008 at 10:51 AM.
#4
So I'm getting a new tranny and I only have 72000 miles. I have the 45RFE it's costing me $3000 CDN. I took it to the tranny shop cause I thought my T-case was going bad. I could hear this clanking noise under high torque in 1st gear. The tranny shop said it definitly is the tranny and that the 1-2 shift is slow. So he was thinking a bad 1-2 clutch and he reccommended doing the tranny before the problem gets worse so I agreed. Did I do the right thing or should have maybe just lived with it. This tranny shouldn't be gone already should it ? I thought this was the best tranny.
#7
i had a new tranny put in at 4000 miles from the dealer on an 06 ( they sent it out to a local tranny shop) i get a call saying its all set. i get a mile down the street and it acts up again. i turn around bring it in. Another 2 weeks later they figure out it was the speed control sensor the whole time.
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#8
2nd prime is the gear that gets used on downshifts from 3rd-2nd. When you drive from a stop the gears go as follows 1-2-3-4-.....5(5spds only)when you pass someone or climb up a hill while you are in motion the trans downshifts as follows 4-3-2nd prime-1 2nd gear is only used in upshifts never down shift. 2nd prime is a passing gear and is a taller gear so it can be driven it up to 70-80mph. I think it's a useless gear unless you have really tall gears like 3:55's or less. It's just a weak gear and Chrysler has done nothing to improve it
#9
#10
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2nd prime is the gear that gets used on downshifts from 3rd-2nd. When you drive from a stop the gears go as follows 1-2-3-4-.....5(5spds only)when you pass someone or climb up a hill while you are in motion the trans downshifts as follows 4-3-2nd prime-1 2nd gear is only used in upshifts never down shift. 2nd prime is a passing gear and is a taller gear so it can be driven it up to 70-80mph. I think it's a useless gear unless you have really tall gears like 3:55's or less. It's just a weak gear and Chrysler has done nothing to improve it
At least they would do this as of about a year or so ago when I had mine done...
To the original poster: Get a second opinion before dropping that kind of jack! There are many other factors that can contribute to poor transmission performance that DO NOT require a new tranny or rebuild. Many people who have been told they need a tranny have ultimately "fixed" their problem with a new sensor or even just a fluid change...
Last edited by HammerZ71; 11-28-2008 at 04:48 PM.