46RH swap - JeepForum.com

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post #1 of 4 Old 01-27-2010, 10:38 PM Thread Starter
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1994 ZJ 
Join Date: Dec 2008
Location: Hanover, MA
Posts: 769
46RH swap

Can you swap out a 46RH and use the 47RH which ive heard is the same thing just more for heavy duty applications without any other major mods?

'94 ZJ
IRO 4.5" Lift
35x12.5 Mickey Thompson Baja MTZ's

98 5.9
Restored and daily driven
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post #2 of 4 Old 01-28-2010, 06:31 AM
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Your biggest problem if I understand this correctly is that on our jeeps the starter is on the passenger side. They didn't make a 47rh with the correct side starter, let alone the right bolt pattern. Now what you can do I believe is remove your 46rh and rebuild it with 47/48 parts (planetery gear sets, wider bands, drums to accommodate more clutches). I know that you can also use thinner steels and "thinner" clutches to stuff more clutch counts into the transmission. What I don't know is if using your 46rh valve body in its stock form would be up to the challenge. But I also don't know if it would be best to install a reprogramming kit for a 46rh, or for a 47/48rh. I believe that the valve bodies are pretty identical as far as layout (the separator plates are probably different, but the basic stuff is the same I believe.) Someone with some more knowledge might be able to answer these questions. I've been toying around with the same idea that you have, although I do know that it gets relatively expensive to start putting in new planetary sets (around 200ish a pop, and there are three separate sets). And for the power that we are putting out on a stock 5.2l it would be overkill. But it would just be cool if it were feasible. Someone with more experience speak up on this!! Correct me if I am wrong!

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post #3 of 4 Old 01-28-2010, 07:06 AM
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get a rebuild shop to rerplace all the 46 innards with 47 innards
I don't see the advantage unless your not telling us you are running 400HP and 38 inch tires
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post #4 of 4 Old 01-28-2010, 08:31 AM
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1997 ZJ 
Join Date: Dec 2006
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the 47rh was used behind motors with a different bell housing pattern than a v8 magnum uses.

'97 zj 5.2, some stuff, some other suff, and some things that even work sometimes.

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