I am helping/advising a friend who is putting a a 52 Jeep pickup on a 2002 Silverado frame. The donor truck has the push button auto 4wd NP246 transfer case. Is there a simpler transfer case that is or can be converted to manual shift? He has no desire to run a TCCM and BCM that are normally needed to make the existing transfer case functional. Any suggestions are appreciated as I am out of my knowledge base here. Also prefer something relatively easy to find in you pull it junkyards. Thanks!
If its involving a bunch of fabrication anyway, there are only a few things you need to determine. The bolt pattern to the back of the trans is pretty much universal. The input spline has a limited number of options, so measure that. The length of the input stub to rear trans seal can change, that's what the back of the trans seals to. I once solved that in a Jeep Commanche by sealing the t-case to the adapter, and let the part in the middle that is supposed to be dry to fill with oil- that was on a manual trans. Pretty much any case now has the front end drive on the left, so then its just a matter of building drive shafts.
My 2000 Silverado has a lever to engage the t case, but it's a manual 5 speed. I presume it was also available with a automatic, but it might be a bit unicorn-ey. Most have the irritating button stuff.
I don't know which transfer case it is, but every 4x4 GMT800 & GMT900 W/T model I've seen has the floor mounted lever shifted case.
You probably need a NP261 transfer case from a 99-07 GM truck.
Also that truck should have a front axle disconnect built into the front differential. Not sure if it's something you delete or fix witgh a switch, but something to look out for.
Convetional wisdom is get a T-Case with the shifter you need vs trying to convert. Find one from a similar year manual shift truck as already mentioned.
Otherwise dont cut your floor up and go for this puppy. May be cheaper than sourcing the transfer case you need and the buttons can live in the glovebox or somewhere else convenient.
https://dmaxswap.com/product/electric-shift-transfer-case-standalone-harness/
This transfer case would need ABS sensors to control the rate of front axle engagement.
They also fail with some frequency due to the internal clutches burning out, which leads to probably the worst smell in the automotive world. People who are fine with Ford limited slip additive would gag when you crack open one of these with burned clutches.
Pete. (l33t FS) said:...internal clutches burning out, which leads to probably the worst smell in the automotive world...
Maybe one of the worst smells in the world period.
I happen to have a 1956 Willys (like "Jeep") pickup that has an NP 241 (manual t-case) bolted to an NV 3500 manual transmission and LS engine. This was a 2000-era setup that works with the LS. I know that much . . .
People don't seem to seek out the 241 all that much, but they also don't complain about them a lot. This may be taken as a value statement.
Jeep guys seem to like the NP241 in TJ Rubicons. Is it different than the GM version?
buzzboy said:Jeep guys seem to like the NP241 in TJ Rubicons. Is it different than the GM version?
For the most part similar. The TJ one has a deeper low range planetary set and different input spline count.
You could use a GMT400 241 as long as its out of a half ton. The front driveshaft would have to be changed, GMT800 front shaft has the slip at the transfer case where GMT400 has a fixed yoke transfer case and the slip in the driveshaft.
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