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post #1 of 31 Old 03-08-2010, 10:00 AM Thread Starter
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np 233 to np 231 t case swap

i have been reading though all the old build threads and really cant find what i need. i have a 2000 blazer with the 233c t case. I rencently picked up a 231c from a 95 blazer. Both trucks are second gen and both has the same vss sensor. I have read through baggys thread that he couldnt get the tranny to shift in low range. I know he was looking for a pin to ground out but i couldnt find an answer if he ever did. Do i need to do this? Im assuming that having the correct t case would eliminate this. Do you guys have any specifics or how to's?


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post #2 of 31 Old 03-08-2010, 10:05 AM
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Re: np 233 to np 231 t case swap

^ I think that was for his electric shift one. With the manual shift case you should have no problems shifting it into low range. The most difficult part will probably be finding the console for for the manual shift. That one is cable shifted correct? I think it would be a simple swap in, and just make sure the cable is free of any kinks and what not.

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post #3 of 31 Old 03-08-2010, 10:21 AM Thread Starter
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Re: np 233 to np 231 t case swap

i have the console. the problem he has was with the tranny shifting. Like the computer didnt know the truck was in low range.

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post #4 of 31 Old 03-08-2010, 11:06 AM
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Re: np 233 to np 231 t case swap

It is kind of a pain, but when mine had a '95 TBI350/4L60E, I used my old 207 for the mechanical speedo and I just drilled and tapped the aluminum adapter/spacer that was between the tranny/transfer and mounted the sensor there then added the 40 tooth ring to the outside of the transfers input gear. Located there it doesn't know or care if it's high or low.

There is probably a simpler solution, but that works if you caan't find one. It's in a friends truck, I can get a pic if you would like.

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post #5 of 31 Old 03-08-2010, 11:29 AM Thread Starter
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Re: np 233 to np 231 t case swap

my new transfer case has the vss on it. I do remember reading somewhere that there is a pin that i have to ground out or something. The new transfer case is a second gen case. I have heard its because the tranny is computer controlled and based on speed.

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post #6 of 31 Old 03-08-2010, 03:20 PM Thread Starter
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Re: np 233 to np 231 t case swap

GOT IT! I did another search through baggy's thread and pulled the link from txzr2.com. I read how to use the pcm ground wire and use the stock shifter swicth to trip the tranny into the low range shift table.

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post #7 of 31 Old 03-08-2010, 04:35 PM Thread Starter
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Re: np 233 to np 231 t case swap

here is the direct link to the thread with the swap.

http://txzr2.com/board/showthread.ph...highlight=swap

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post #8 of 31 Old 03-08-2010, 06:14 PM
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Re: np 233 to np 231 t case swap

Where did you find a manual shift 4x4 console? I am SAS a 98 2wd Blazer and am looking into options for the manual 241 case shifter. Right now my plan was to use an factory auto trans floor shifter with a modified cable set up.
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post #9 of 31 Old 03-08-2010, 06:18 PM
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Re: np 233 to np 231 t case swap


97 S-10 Blazer 4x4 sport(SAS'd) - 93 yj dana 30 axle, Rancho 44044 leaf spring set-up, Sky Manufacturing crossmember, Spring over rear with Ford 8.8, 2" PA body lift, 31x10.5x15's, 98 Sonoma Highrider front clip, 10" Alpine Type E in DecWares Deathbox 2, 500w Alpine mono amp

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post #10 of 31 Old 03-08-2010, 10:55 PM
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Re: np 233 to np 231 t case swap

Glad you found it.

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post #11 of 31 Old 03-09-2010, 06:33 AM Thread Starter
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Re: np 233 to np 231 t case swap

i found my stuff in a junkyard. out of the 23 s trucks there was one with the floorshift. they ran from 94-97 in the trucks and 95-97 in the blazers.

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post #12 of 31 Old 03-09-2010, 07:51 AM
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Re: np 233 to np 231 t case swap

^ we owned one for a short while. Should have kept it, one of those rare things...

1996 4dr 4wd Blazer D30/8.8 combo w/ 4.10s, sky manu kit, rancho 44044 springs. 33" tsls, Dynomax muffler...Still Dead in the water
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post #13 of 31 Old 03-09-2010, 08:11 AM Thread Starter
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Re: np 233 to np 231 t case swap

same here i had a 94 gmc sonoma that had it. now i hate myself for getting rid of that truck.

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post #14 of 31 Old 03-09-2010, 12:13 PM Thread Starter
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Re: np 233 to np 231 t case swap

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i havent even rebuilt the case yet so relax. if you cant tell by my build i like to have every aspect of a swap figured out before i complete it. I will not rush somethign that i do drive on the street. lol

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post #15 of 31 Old 03-09-2010, 12:34 PM
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Re: np 233 to np 231 t case swap

I have 1 truck that I know of around here with a manual shift console. I'm not telling anyone though

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post #16 of 31 Old 03-09-2010, 12:48 PM Thread Starter
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Re: np 233 to np 231 t case swap

grab it if you can now. they are so hard to come by and easy to swap in. i hcecked out my floorboards and it has all the indentations where i need to drill for bolts and the hole for the shifter cable.

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post #17 of 31 Old 03-09-2010, 01:08 PM
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Re: np 233 to np 231 t case swap

Yeah I'll probably grab it one of these days before they end up crushing it. If I don't use it I'm sure I won't have any problems selling it. What do I get?? Just the shifter, cable, and console, right??

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post #18 of 31 Old 03-09-2010, 01:21 PM Thread Starter
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Re: np 233 to np 231 t case swap

yes. the shifter comes in a gate that is bolted to the floor. the trucks had a stand alone counsol because most had a 60/40 split bench. the blazers had a full counsol. i would grab the tcase also if you can. It most likely has the stronger planitary gears and the wide chain. Also make sure you grab the shifter handle. Gm has discontinued these parts so none are avaible at the dealer. Save them from the crusher. I was reading that just the counsol sells for over 200 to the right people.

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post #19 of 31 Old 03-09-2010, 01:44 PM
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Re: np 233 to np 231 t case swap

I'm not gonna bother with the t-case. I'll go grab the console and shifter setup though. I'm about 95% sure I'm not gonna use it, but I'll get it and sell it to someone who needs it.

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post #20 of 31 Old 03-10-2010, 01:45 PM
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Re: np 233 to np 231 t case swap

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Originally Posted by wrekd View Post
I'm not gonna bother with the t-case. I'll go grab the console and shifter setup though. I'm about 95% sure I'm not gonna use it, but I'll get it and sell it to someone who needs it.
I would be interested in buying it if you don't use it. Let me know because I am starting my swap soon.
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post #21 of 31 Old 03-12-2011, 04:42 PM
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Re: np 233 to np 231 t case swap

Hi Guys, I'm new here; n last year i saved a 99 ZR2 Blazer n restore it interior, heater, a/c n some body work n i installed the 4X4 Posi-Lok cable; but now i'm having problems w/ the T-case, so i want to swap the 231C case keeping the planetary n chain from my 233; but i was reading how hard is to get console n shifter lever; so i'm wondering if some ever used a XJ Cherokee linkage n shifter lever from the 231J T-case?? How about the console??.

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post #22 of 31 Old 03-12-2011, 09:20 PM
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Re: np 233 to np 231 t case swap

chevy np 231 is cable shifted IIRC, i thought the holes where already there u just gotta punch them out once again.....IIRC

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post #23 of 31 Old 03-15-2011, 08:39 PM
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Re: np 233 to np 231 t case swap

Maybe a shifter from a first gen 4x4. The 94- 97 console won't fit without trimming the front anyway and you lose the shift indicator. Mounting the shifter to the floor is the easiest part.

I cut up a console just for the part that bulges out and covers the shifter oh well was going to be crushed soon at the junkyard anyways..lol

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post #24 of 31 Old 03-17-2011, 11:05 AM
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Re: np 233 to np 231 t case swap

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Originally Posted by BillaksBlazer View Post
i have been reading though all the old build threads and really cant find what i need. i have a 2000 blazer with the 233c t case. I rencently picked up a 231c from a 95 blazer. Both trucks are second gen and both has the same vss sensor. I have read through baggys thread that he couldnt get the tranny to shift in low range. I know he was looking for a pin to ground out but i couldnt find an answer if he ever did. Do i need to do this? Im assuming that having the correct t case would eliminate this. Do you guys have any specifics or how to's?

If I understand this right by changing the t-case to a 231 from a 233 then the trans wont shit when in "4low" , If so I might know why. With the 233 theres a 4low wire going from the 4wd module to the ECM which controls the trans. In trucks with a 231 the "4low" wire from the ECM goes to the 4wd Indicator switch.

96+ auto w/233


96+ auto w/ 231



Since the 231 isn't operated by the computer then the system has no way to know its even in 4low, thats why in the 231 schematic theres a 4low wire on the 4wd indicator lights.

I think this info might help a little bit.

1995 Blazer HPD30 / 8.8 w/ 4.10's sittin on 33s.
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post #25 of 31 Old 09-18-2012, 06:25 PM
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Re: np 233 to np 231 t case swap

I'm looking for that hard to find console and shifter if anyone runs across one!
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post #26 of 31 Old 09-18-2012, 07:22 PM
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Re: np 233 to np 231 t case swap

i find them all the time what color are you looking for

01 crew sas 44 narrowed hp44 front chevy 8 lug outers 63.5 wide C&C 14 bolt rear 4.56 gears Detroit locker rear lock right front vortec 350 4l60e 231x233 doubler 37x13.5x16 km2 oba custom pcm for less tune
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post #27 of 31 Old 09-18-2012, 07:42 PM
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Re: np 233 to np 231 t case swap

Really?

I'm needing the shifter and cable assembly.
I'd sure be willing to pay you for it and your trouble if you came across one, well two since he already spoke for one.

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post #28 of 31 Old 09-18-2012, 10:07 PM
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Re: np 233 to np 231 t case swap

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Originally Posted by contact420 View Post
If I understand this right by changing the t-case to a 231 from a 233 then the trans wont shit when in "4low" , If so I might know why. With the 233 theres a 4low wire going from the 4wd module to the ECM which controls the trans. In trucks with a 231 the "4low" wire from the ECM goes to the 4wd Indicator switch.

96+ auto w/233


96+ auto w/ 231



Since the 231 isn't operated by the computer then the system has no way to know its even in 4low, thats why in the 231 schematic theres a 4low wire on the 4wd indicator lights.

I think this info might help a little bit.


WOW, I cant believe I posted this and it helped. lol

1995 Blazer HPD30 / 8.8 w/ 4.10's sittin on 33s.
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post #29 of 31 Old 09-19-2012, 03:29 PM
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Re: np 233 to np 231 t case swap

I'll take any color if that's all there is! LOL! Prefer black though. I just stuck the 241 in a few minutes ago and it'll stay in 2 wheel until I get linkage and get the rear gears changed. I need to go look at the couple places around here again too. Maybe one has turned up in the last month.
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post #30 of 31 Old 09-19-2012, 04:04 PM
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Re: np 233 to np 231 t case swap

I've had a total of 3 full shift consoles and 3 short consoles in the past 2 years. I now only have the full console that is in my s10, but they are out there, just not easy to find.


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post #31 of 31 Old 10-08-2012, 05:34 PM
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Re: np 233 to np 231 t case swap

Got the Blazer rolling with the 241. Still need front drive shaft in, the console and linkage, and finish the wiring for 4Lo shifting. I guess there are different ones for trucks with bench seats... I don't want that one. Need one with the full console to replace the Blazer's stock one. My factory console is Black or Ebony I think. Kinda like having a hunting project going!
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