RE5R05A interchange question

Miles Owner/Technician Georgia Posted   Latest   Edited  
Updated
Drivetrain
2008 Nissan Frontier LE 4.0L (VQ40DE) 5-spd (RE5R05A)
P0734 — Gear 4 Incorrect Ratio
P0735 — Gear 5 Incorrect Ratio
P0717 — Input/Turbine Shaft Speed Sensor "A" Circuit No Signal

So I just rebuilt a RE5R05A out of a 2008 Nissan Frontier 2WD. It was destroyed by glycol contamination... this is my first RE5R05A rebuild alone. I did a full rebuild with steels, clutches, seals, pump and tail bushing, street smart reman valve body/tcm, and new torque converter. Flushed the external cooler and blew out with compressed air. Bypassed the radiator cooler and am running just the external oem cooler. Did all the required relearns as well. 

The truck shifts through all gears perfectly from a cold start and continues to do so for about 4 miles or until the transmission gets up to temperature (165-185 degrees Fahrenheit). Once it gets to temp it starts to slip into 4th and 5th then shortly after looses 4th and 5th all together. From there you have to use manual 1-3 to get back to the shop. It throws a P0734 Fourth Gear Ratio 1st and if you drive it too long you get a P0735 Fifth Gear Ratio and P0717 Input/Turbine Speed Sensor Circuit as well. The input/turbine speed pid matches the engine rpm pid at idle and never has any drop out.

A little background on the customer... I quoted her for a used transmission swap but after seeing that the glycol contamination was widespread I offered to rebuild at the same quoted price if the valve body/tcm could be saved. If it couldn’t she would have to buy a valve body/tcm which indeed happened in the end. I offered this because she is a family friend and thought I would help as she is a single grandmother with custody of her grandchildren. Bad idea! She doesn’t realize anything that I am doing for her and is botching and demanding warranties after the fact. Now that we have this problem it’s gotten even worse. 

So my main question is.... Does anyone have any idea what the problem is? I have hear that it’s common after a rebuild to get a these codes with flare up from 3-4 with a neutral 5th if the input shaft seals were not installed correctly. It seems a lot of rebuilders use 47re or VW 09G sealing rings on the input shaft instead of oem due to the possibility of damage while installing or leave the original seals on the input shaft alone if not damaged. 

My second question is about interchange/compatibility between the RE5R05A transmissions. Since I only charged her for a used transmission the fastest fix may be to buy a used transmission. The only way this will make since money wise is if I can use a RE5R05A from a G35 or such that only cost $300-400 with low miles. I saw a post from a guy who put a 2008 G35 trans in his 2006 Pathfinder. He said all he had to do was use his original valve body/tcm (I have a brand new already programmed), swap the bell housings, swap the tailshaft housing, and flip the shift shaft and rooster comb from the driver to passenger side. He used the g35 torque converter and said it worked like a charm. I’m trying to find out if this is really all that needs to be done and which year g35s will work. What about other RE5R05A transmission? What is required for them to swap? I’m shooting more towards the cheaper versions ie g35, 350z, etc but will take into on all of them. I think this would be a better option then trying to replace the input shaft seals and possibly end up in the same place again. 

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Michael Mobile Technician
Utah
Michael Default
 

Hi Miles, From a programmer standpoint we have run into nuances between the vehicles. Not sure of the internals, ratios ext... When programming we have to be very specific. 2WD, 4WD, Full Time, Part Time and even the body style seems to be important. I don't think I would mess with trying to mix and match. Your customer is most likely already amped up and another setback may not bode well.

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Miles Owner/Technician
Georgia
Miles Default
 

Yes customer is amped up so that’s why I’m trying to go with the most likely to succeed option, which at this point might be the swap of a used transmission from a g35 if the gearing is the same. Even if it’s a bit different how much of a issue will that cause if any?? All of those ratios are so very close anyways.

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Keith Diagnostician
Oklahoma
Keith Default
 

There are a few gear ratios, and clutch pack size and width variation for the different vehicles, namely the reverse set. The RE5 exist in vehicles from … My recommendation is to get a unit from the exact same vehicle.

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Keith Diagnostician
Oklahoma
Keith Default
   

So I dug up some info I have laying around, the part numbers listed are on the metal tags that are bolted to the transmissions. diag​.​net/file/f56596x3f… diag​.​net/file/firn4e4si…

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Miles Owner/Technician
Georgia
Miles Default
 

Awesome thank you so much. Will check the part number on the transmission in the truck and see if the 08 g35 matches. If so I will swap on the valve body/tcm, bell housing, tailshaft housing, and flip the shift shaft to the passenger side. I’m also going to air check the input clutch is while I’m at it on the rebuilt one and see if that’s the problem.

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Mike Owner
Kentucky
Mike Default
 

I'm always cautious of mixing and matching on these, as nissan have a lot of model differences. I'd def. Pay attention to the info. Keith sent if u try to mix and match due to the ratio changes.....on a side note, also be sure to change all your rubber houses on lines if u didn't already. The glycol soaks into them and as it goes through a few heat cycles the glycol will leach out of them. I've…

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Miles Owner/Technician
Georgia
Miles Default
 

Thanks so much! I will try and match the ratios. You are correct that no good deed goes unpunished!!

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Miles Owner/Technician
Georgia
Miles Update
 

So it looks like from the information that Keith gave me and a seminar document I found by ATSG in 2011 the 2008 G35 has the same gear ratio as the 2006 Nissan Frontier that’s here. I also have a 2008 Infiniti G35 here for some repairs and I took a look at the part number on its transmission which is 99X6A which indeed matches the gear ratio of the transmission that’s in the truck now part…

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Miles Owner/Technician
Georgia
Miles Update
 

So I installed the 2008 g35 transmission. Switched bell housing, tailshaft housing, manual shaft, and installed the street smart valve body/tcm that I used in the one I rebuilt. The input clutch would not hold any pressure when I air checked it. All the clutches on the used g35 air checked and held with no leaks. I took it for a test drive and it shifted through the gears wonderfully on the…

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