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Old 06-07-2014, 10:12 PM   #1
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NP231C-HD Question

I am in the process of swapping in a 5.3L in place of my tired 2.5L and will be using the GM 4L60E transmission. My plan is to use the front half of a NP231C transfer case to bolt up to the 4L60E transmission, with the back half from the Jeep's NP231J. I read somewhere that if a person were to find a NP231C-HD in a salvage yard to grab it because they are hard to find. Well I found one, but after searching on-line I cannot find much information on what makes this such a good transfer case. Can someone explain? Thanks.

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1993 YJ Wrangler 2.5L, SOA with Ford 8.8 rear end on 33's.
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Old 07-03-2014, 09:44 AM   #2
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The big difference besides the spline count is that it uses a 6 gear planetary. These TC's can be found in S-10 & S-15 trucks. I use the planetary's in doublers because they are much stronger with the 6 gears over the 5 gear setups found in the jeep 231 TC's.
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