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47re tranny problems

wagntagn
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wagntagn

wagntagn

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Last year I got my tranny completely rebuilt,our local tranny specialist put everything heavy duty and it never performed too good it seemed like the shifting was sluggish from 1st to 2nd  and now 9000K later the tranny let go again he pulled it apart and everything was wore out he replaced everything under warranty and he mentioned that the problem was the alternator, as anybody experience something similar?

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IBMobile

IBMobile

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The rebuilder may be thinking about AC voltage causing the PCM not to lock up  the overdrive but to wear out clutches and bands along with the sluggish shifting I think not, The transmission probably has low line pressure causing the bands and clutch packs not to fully engage/slip and the front pump is the first place to look.  

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wagntagn

wagntagn

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Checked the AC voltage from the alternator and I picked up 22.8 mV ac ? is that good?Then I pulled the alternator fuse out went for a ride same thing.How and where can you check the pressure at the front pump?The tranny guy mentioned that it's probably the governor pressure not engaging due to voltage from the alternator?When my tranny shifts from 1st to 2nd there's like a delay if I drive up a steep hill in drive the tranny overheats but if I put it in 1st gear then no problem.

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wagntagn

wagntagn

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Thanks Hag,I'll need to find fittings to adapt guages,there's nothing on my bill from the Tranny guy regarding governor pressure valve & sensor maybe it's a problem with low pressures??

Question can the 47re tranny handle 35" tires with  3.55 diff"s maybe too much of a load on them,does anyboby as the same problem?

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015point9

015point9

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7 hours ago, Mopar1973Man said:

I had mine replaced and there was no difference. Then 3k miles more it decided to munch on the torque converter. So one simple little valve is not going to make all the wore out bands, clutches, etc better nor is it going to fix wore out torque converters either.

 

 

Just wondering...Did this happen recently?

 

Is this your Dynamic Transmission?

Edited by 015point9
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notlimah

notlimah

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On September 16, 2016 at 2:34 PM, wagntagn said:

Thanks Hag,I'll need to find fittings to adapt guages,there's nothing on my bill from the Tranny guy regarding governor pressure valve & sensor maybe it's a problem with low pressures??

Question can the 47re tranny handle 35" tires with  3.55 diff"s maybe too much of a load on them,does anyboby as the same problem?

 

Clearly running anything bigger then stock, you're more then likely to put extra/unneeded strain on drivetrain components. With that said, if you drive nice majority of the time and don't hot shot it, I think things would be ok for the most part. Still probabaly some extra wear and tear but nothing too crazy. I'm currently on 315's just an FYI. 

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  • 7 months later...
wagntagn

wagntagn

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The tranny is still acting up from 1st kind a skips 2nd then goes in 3rd ,one thing I did is when pulling up hill if I leave the tranny in 1st gear it doesn't run hot if in drive it overheats,the second gear doesn't engage fully overheating tranny,my traany guy told me it's bad grounds causing the issue some guys did the fix by wrapping grounds with foil paper??Is this possible?

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JAG1

JAG1

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1 hour ago, Mopar1973Man said:

Absolutely. Do NOT install noise filters, add tin foil, modify APPS wiring or extra ground wires. Fix the damaged alternator... Most likely a bad diode pack in the alternator fairly common issue.

 I am wondering...When adding grounding wires.. it hides the harmful AC ripple because it creates a more efficient route to the batteries? Why can't the DVM measure the A/C ripple thru the added grounds if one probe is on the negative battery post?

 

 

12 hours ago, wagntagn said:

The tranny is still acting up from 1st kind a skips 2nd then goes in 3rd ,one thing I did is when pulling up hill if I leave the tranny in 1st gear it doesn't run hot if in drive it overheats,the second gear doesn't engage fully overheating tranny,my traany guy told me it's bad grounds causing the issue some guys did the fix by wrapping grounds with foil paper??Is this possible?

I sometimes have gear hunting between 1st and 2nd. It's kind of like I'm cruising slowl,y no acceleration just letting the truck run a little bit above coasting, floating So to speak. I have not gotten rid of the issue and my A/C voltage with the Fluke is .01.

So I'm cleaning existing grounds and the truck seems to be responding better in other ways but still have more to clean and tighten. Some were not snug and at worse only slightly corroded.

 

I did have to add a ground from the alternator casing to the negative battery post because my dc voltage at the batteries was too low in comparison to the voltage at the back of the alternator. even though everything is clean tigh at the battery postst, the alternator ground was showing a poor ground connection thru the mounting bracket.

 

Mike does not like me doing this even though it's my truck, LOL, so I promise to unhook this ground during A/C ripple tests.

Edited by JAG1
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