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keep the 904 or go with 46RH ? #250387
03/11/09 10:07 AM
03/11/09 10:07 AM
Joined: May 2004
Posts: 1,522
Ste-Sophie, Quebec, Canada
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Wedgeman Offline OP
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Wedgeman  Offline OP
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Swapping for a magnum engine in my A-body...should I be going with the 46RH or will my 904 be enough ? Bog difference in strenght between the 2 ?

Dan

Re: keep the 904 or go with 46RH ? [Re: Wedgeman] #250388
03/11/09 11:05 AM
03/11/09 11:05 AM
Joined: Feb 2003
Posts: 21,318
Manitoba, Canada
DaytonaTurbo Offline
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Manitoba, Canada
I thought the 46RH was the 727 based o/d trans and the 42RH was the 904 based one. There is a big difference between the 904 and either of the two o/d's in terms of size and the amount of tunnel needed.

Re: keep the 904 or go with 46RH ? [Re: DaytonaTurbo] #250389
03/11/09 02:03 PM
03/11/09 02:03 PM
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las vegas
70AARcuda Offline
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the OD units on a 42rh and 46rh are the same size...they only difference is the number of clutches and steels inside..


so on that end of the trans is not going to make any difference in trans tunnel surgery...

46rh is based on the 727
42rh is based on the 904


Tony

70 AARCuda Vitamin C
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71 Demon 360 10.666 @122.41 (01-29-17 @ Las Vegas)
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Re: keep the 904 or go with 46RH ? [Re: Wedgeman] #250390
03/11/09 04:17 PM
03/11/09 04:17 PM
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Vancouver, WA
MoparMarq Offline
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Don't know about 904s (and very little about the later ones), but the trans designations say something about trans. 42RH decodes as 4 forward speeds, level 2 torque capacity, (something), hydromechanical actuacted. 46RH is 4 forward speeds, level 6 torque capacity. I'd go with the 46RH, if it becomes a choice of 42RH or 46RH.

As for the choice between 46RH and 904, I'd go 46RH as that gets you a tidier way of getting the overdrive.

Plus, though I may be out of left field here, some of the 42s have torque converter issues. My sister has a Jeep Grand Cherokee with the 42RE that will occasionally not stay in torque converter lockup driving on the highway (above 48 mph). I believe this is a known problem among dealers (yes, she had the TSB flash to the control unit). They refuse to look at the trans "because it hasn't thrown a code". (Whatever happened to good old-fashioned diagnosis?) My Durango had the same problem for a while (46RE trans) until I changed the fluid to Amsoil and put in a new filter. Problem solved in the Durango. Fluid and filter change in the GC helped a little, but didn't solve the problem. Maybe electrical, maybe the TC, maybe something weird about the Grand Cherokee version of the trans, I don't know.

Re: keep the 904 or go with 46RH ? [Re: MoparMarq] #250391
03/11/09 05:17 PM
03/11/09 05:17 PM
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Posts: 1,522
Ste-Sophie, Quebec, Canada
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Wedgeman Offline OP
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Wedgeman  Offline OP
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Good info to know...
thanks
Dan

Re: keep the 904 or go with 46RH ? [Re: Wedgeman] #250392
03/11/09 05:28 PM
03/11/09 05:28 PM
Joined: Jun 2008
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Oakdale CT
gdonovan Offline
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Oakdale CT
Quote:

Swapping for a magnum engine in my A-body...should I be going with the 46RH or will my 904 be enough ? Bog difference in strenght between the 2 ?

Dan




You will have to do a bunch of slicing and cutting to the trans tunnel to fit a 46R in there.




"I think its got a hemi"
Re: keep the 904 or go with 46RH ? [Re: gdonovan] #250393
03/11/09 11:31 PM
03/11/09 11:31 PM
Joined: May 2004
Posts: 1,522
Ste-Sophie, Quebec, Canada
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Wedgeman Offline OP
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Wedgeman  Offline OP
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That's what I thought too...
Thanks
Dan

Re: keep the 904 or go with 46RH ? [Re: MoparMarq] #250394
03/12/09 07:36 AM
03/12/09 07:36 AM
Joined: Jun 2008
Posts: 251
Lithonia, Ga
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36PLYM Offline
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Lithonia, Ga
Quote:

Don't know about 904s (and very little about the later ones), but the trans designations say something about trans. 42RH decodes as 4 forward speeds, level 2 torque capacity, (something), hydromechanical actuacted. 46RH is 4 forward speeds, level 6 torque capacity. I'd go with the 46RH, if it becomes a choice of 42RH or 46RH.

As for the choice between 46RH and 904, I'd go 46RH as that gets you a tidier way of getting the overdrive.

Plus, though I may be out of left field here, some of the 42s have torque converter issues. My sister has a Jeep Grand Cherokee with the 42RE that will occasionally not stay in torque converter lockup driving on the highway (above 48 mph). I believe this is a known problem among dealers (yes, she had the TSB flash to the control unit). They refuse to look at the trans "because it hasn't thrown a code". (Whatever happened to good old-fashioned diagnosis?) My Durango had the same problem for a while (46RE trans) until I changed the fluid to Amsoil and put in a new filter. Problem solved in the Durango. Fluid and filter change in the GC helped a little, but didn't solve the problem. Maybe electrical, maybe the TC, maybe something weird about the Grand Cherokee version of the trans, I don't know.




The something designation you are looking for is R for rear wheel drive


36 Plymouth Coupe
318 w/360 heads
518 trans
8 3/4 rear
Ga. Tech BCE'78






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