1st Generation Dodge Cummins 89-93 Discussion of 12 Valve 5.9 Liter Dodge Cummins Diesels with Rotary Injection Pumps

New to site with auto trans problems.

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  #21  
Old 02-19-2013, 11:08 PM
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Bought a rebuilt 727 from a shop in IN. Cost a bit but works good. Now I am having O/D trouble with my '91. Cold days won't stay in O/D. Any sugestions?
Thanks!
 
  #22  
Old 02-20-2013, 05:19 PM
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trans temp sensor is making it stay out of od. I'd say your air to oil and water to oil cooler is cooling your trans fluid faster than desired. So when the cold oil comes back past the sensor it kicks it out of OD. I believe the temp is 45 degrees. I've heard of people taking the sensor out and "hard wiring" it so it will always go in OD.

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Originally Posted by frosty4227
going with the 47rh from a 94-95 dodge cummins is going to be the best bang for the buck swap because of the o/d and lock up capabilities, your increase in fuel mileage will save you alot of money in the long run,(rust bucket makes 447 approx horse on fuel only and gets 27 mpg). lower rpm's also means all.. the parts that help your engine work including the engine will last longer without needing parts/refreshing. but like they all said they will cost more, at least around here they sell for 700-1000 for a complete used trans thats stock, and at least a aftermarket low stall single disk tc is recomended because they dont do well with the stock one. the rh version is easy to wire up because it just uses a three prong plug that you will hack into for tc lock up and your over drive function, which you can use to split gears, giving you a six speed. the downfalls to the rh vs the re is that the rh has less ribbs on the case (although you can find some late 95 rh's that have more ribs, but its very hard to hurt the case) you will have to modify or make a new cross member also. if you plan on locking it up in first or second its also recomded that you run a billet flexplate and a billet input shaft that will not break under the increased stresssa nd torque being applied. personally im saving up for a 47re transmission(you can stuff 48re parts in them with modifications and the electronic valvebody allows you to run different tunes and adjust shift points and line pressures on the fly. every trans has its good and bad. just really depends on what you want it to do and how you want it to drive and funtion and all.

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thats just stuff i know. i dont know everything, i just do a lot of research into diesel stuff because i love it all.
I have a stock 92 im going to put a 47 in. How did you control lockup? My truck already has OD control. And i'm hoping for 22 - 24 mpg after the swap. I get about 18 with 31's and a 20k mile trans. Should i expect more?
 

Last edited by CUMMINStagetcha19; 02-20-2013 at 05:19 PM. Reason: Automerged Doublepost
  #23  
Old 02-21-2013, 11:40 AM
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Originally Posted by CUMMINStagetcha19
I've heard of people taking the sensor out and "hard wiring" it so it will always go in OD.
I'd put a temp gauge on it first.
 
  #24  
Old 02-22-2013, 10:30 AM
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Thanks for the info, I will check the temp. Maybe try bypasseng the temp sensor until spring. No plans for any large loads this winter anyway. Over 258,000 miles and still strongdrivtrain other than the O/D shifting troubles.
Thanks
 
  #25  
Old 02-24-2013, 11:32 AM
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I'd go with a manual swap with the nv5600 6 speed transmission!
 
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