fly wheel housing and transmission question

[TFaucette]

one of my friends just picked up a nice 2wd first gen (either a 92 or 93)at a really good deal, but has a trans issue it is a stock push button overdrive 518 but he has found a cheap 47rh, so my question is will the 47rh bolt to the existing cummins flywheel housing or does he have to find one form a truck that had a 47rh. he has posted this question on compD and cummins forum and has gotten a 50/50 yes a nd no back. also i am hoping it just need serviceing becasue we trailered it home and cranked it up and it pulled just fine but eventually just quit except reverse, does that sound like mabey just a stopped up filter or a major failiure, my 48re in my common rail did the same and was a filter.

 

[cerberusiam]

The trans will bolt to the existing housing fine, the TC will jam because the engine adapter is not deep enough.



To swap a 47RH into 1st gen you need an 2nd gen engine adapter, starter, and flex plate.



To install it is pretty easy on a 2x4, several holes need to be redrilled for the linkage mount and cross memeber but nothing major.



The new plug for lockup is available in several places now so even the wiring and sourcing parts is pretty easy.







The fact that he is getting a 50\50 answer on CompD and CF is making me :-laf:-laf

 

[TFaucette]

thanks, is there any way he can get a lockup for the 518, and if he is eventually wanting to add sticks and change turbo (300-350hp range) what parts does he need to make the 518 hold?

 

[cerberusiam]

Sure, but a 518 with lockup is a 618 (47RH). The external differences are all in the TC. Its 1. 25 inches deeper to accomodate the clutches.



A 518 will hold 300-350 HP with a good fluid coupling TC and work well. It just depends on how much money he wants to spend on pieces.



A good low stall steel stator TC that will load the engine down will run you $300-500. That has to be matched with injectors, pump changes, and a quicker spooling turbo or its a smoky pig to get rolling.



Internally the biggest problem is the aluminum caged planetaries . They don't like a lot of stress and abuse. The normal fixes for the sloppy OE build are also recommended, billet servos, band strut, accumulator, **** kit, etc.



I have one with a built 47RH in it, works great but noiw needs more power. Another one has a very tight TC in a 518 with more than a few fueling enhancements and it works great. The 3rd has a mild TC and mild fueling enhancements and it works great also.



Just depends on what you want to do and how you want to play.

 

[mysteryman]

last word on auto trans

Heres the deal , In the 1994 model year the lock up torque converter was added to the Cummins equipped trucks. the "RH" means hydraulic .

Lockup converter trans for the cummins that was hydraulic was only used in the 94 and 95 model years. In 96 we went to "RE" The E being electric. 100%

When the lockup was introduced we needed more room for the fatter converter. So rather than make a new trans housing. We decided to make a deeper adapter plate to make up the difference. . There is also no provision for the lockup in the 93 computer system. you can use a pressure switch on the governor port or just use a manual switch to engage it. An old floor mounted dimmer switch works well for this. There is even a stamped out spot on the floor already there for it.



So you will need a 94 up adapter plate if you plan on using a 94 or 5 trans.

The bolt pattern on the trans bell housing is the same as a V10 gas trans.

No other gas trans will fit the cummins. And never use any gas converter on a cummins!! The V10 gas trans will bolt up but the valve body is different and the governor weights are different. Not to mention other thing as well. It will also shift really really too late, Only use transmissions that originally cam on Cummins engines for swaps. And never use RE trans on first gen trucks unless you know how to design a computer to shift them

one of my friends just picked up a nice 2wd first gen (either a 92 or 93)at a really good deal, but has a trans issue it is a stock push button overdrive 518 but he has found a cheap 47rh, so my question is will the 47rh bolt to the existing cummins flywheel housing or does he have to find one form a truck that had a 47rh. he has posted this question on compD and cummins forum and has gotten a 50/50 yes a nd no back. also i am hoping it just need serviceing becasue we trailered it home and cranked it up and it pulled just fine but eventually just quit except reverse, does that sound like mabey just a stopped up filter or a major failiure, my 48re in my common rail did the same and was a filter.

 

[Paul Herioux]

Don't forget that when you change the adapter plate you will need to change the starter(or at least the nose housing) and shorten the driveshaft. Switches on the dash worked well when I put one of these transmissions in my 89. It allowed me to upshift with the converter locked which greatly improved unloaded performance. Don't try this while towing though, get kind of rough on converters.