Need help from chevy s-10 wheelers. Im running a 350/700R4 with a 231C from an S-10/S-15, in my 88 Jeep YJ. I decided to run the s-10 231 since it would bolt right up to the 700, and i wouldnt have to spend 500 bucks on the adapter to mate the jeep 231 to the 700. Have SYE'd it and has worked out great --for the most part. Two things I would like to change--1- is a pain in arss to shift, and -2- the shifter is dog ugly on it--that plunger to depress to slip it into gear etc etc.. Are there any common mods out there to do to switch the shifter etc etc. And is part of my hard shifting part the fact that i am not running any vac. on the t-case since i have lockout front axles?? By shifting i mean 2H-4H, N, 4L. Any ideas?? other then dropping 2K on an atlas??

Vaccuum has nothing to do with the shifting, it only controls the front axle disconnect if you have the dana 30.

I've been running that setup for years and never had a single problem. Running the AA 32 spline SYE and the Jeep speedo drive. I love the shifter from the S-10, much better than the Jeep one. If it's hard to shift I'd suggest tearing it apart and inspecting everything (ie bent shift rails) or just spend $50 and get another case to throw in it.

They are sometimes difficult to shift into low, but that might be due to being in an s-10 body, space constraints. But if it has trouble shifting throughout, then like Bluejeep said, might be internally. I think there's an adjustment on the bottom to adjust the force on the shift PAW(?), is it called? this might be overtightened.

Since you mention that you're running a SYE, what one did you use??? I've been researching what's available and haven't found much. I have the similar setup in my YJ from a '91 Blazer...

Thanks,

Jeremy

Trooper, I'm doing a similar swap (305 tpi - 700r4) and still researching options. My 700r4 is the 2wd version and I'm trying to find options for mounting the jeep 231 to it (besides the $450 at AA).
First thought was that a S-10 adapter would work.
I have a 23t spline Klune-V and JB super short SYE so I don't want to start over with the back half.
What's the difference in mounting between the jeep and chevy np231.
Is it just the output shaft length and spline count, or are the bolt patterns not compatible either?

If you're askinng me you can read above where I stated AA 32 spline SYE for a 231J. Fits fine in the 231C.

Since you mention that you're running a SYE, what one did you use??? I've been researching what's available and haven't found much. I have the similar setup in my YJ from a '91 Blazer...

Thanks,

Jeremy

Everything is different in the mounting between the 231J and the 231C. The 231J has 6 bolts attaching it to the adapter, the 231C has 5. The 231J has 23 (or 21) splines, the 231C has 27. The clocking of the transfer case is even different. You're going to either have to get a 4wd 700, or have your output shaft changed to the 4wd or the AA one. Your best bet is to buy the adapter from AA if you want to use the Klune.

Trooper, I'm doing a similar swap (305 tpi - 700r4) and still researching options. My 700r4 is the 2wd version and I'm trying to find options for mounting the jeep 231 to it (besides the $450 at AA).
First thought was that a S-10 adapter would work.
I have a 23t spline Klune-V and JB super short SYE so I don't want to start over with the back half.
What's the difference in mounting between the jeep and chevy np231.
Is it just the output shaft length and spline count, or are the bolt patterns not compatible either?

Is a 4:1 available for the 231C?

Thanks Bluejeep.
Any advise on wether the do it yourselfer can change out the tailshaft on the automatic trans, or is this a specialty shop job?
I've heard that you pretty much have to tear down the entire trans to do this.

No 4:1 available for the 231C, but with the 700R4, 5.13's in the axles, and 39.5's I really don't ever run into situations when I'm not low enough. I'm very happy with my low range right where it is, and I like the fact that I'm running a $50 transfer case, though I've never had any problems with it yet.

I don't think it's a DIY job to change the tailshaft. I had my transmission built by a reputable shop that dyno'd it before it went out the door, as I don't know anything about the internal workings of an auto transmission.

T-cases are much more simple than an auto tranny. I won't mess with a tranny either. But have tore into many t-cases. I have a bud that just finished installing a 4:1 equipped 231J onto his 4L60-E, same as 700 more or less. The 4:1 kit has a special input that wont swap to regular 231's, J or C. So he had to go the Novak conversion route. The Novak kit replaced the output shaft in his tranny. The input shafts of the regular 231s will swap though. Also, like stated, the Jeep is 6 bolt and Chevy is 5. But newer s-series, 98 and newer maybe, came with a 6-bolt tranny-tcase adapter. This 6-bolt pattern is not identical to the Jeep pattern. I have not done or seen it personally but I have read of someone only needing to hallow out one of the holes to mate up a D300. I think the D300 and 231J have the same bolt pattern, is this correct? Anyway, maybe it's something to look into.

Hardcore,
I contacted JB Conversions, they are down south, Louisiana, or Alabama, I forget which, they are easy to find on the web-- if you need i can post their info. Great company-- guy does an awesome job, and i have not have had a problem with anything bought from them. This is my second SYE, used them on my 1st jeep, then this one. I missed the shorty SYE buy a couple of weeks, because i couldnt wait-- should have though. When I talked to him, I told him what I was doing, using, and wanted, got it all sent out for me to have local guy install it. Even have the orginal Jeep Speedo sender in the 231C, so when I get sick of eyeballing my speed, i can easily install the correct speedo gear. His product was the best that i found. Sure you might find cheaper-- but its weaker and will break in the long run.
Also on my set up Im running a 2" body lift (long story) and when i put the t-case in the shift wasnt in the Jeep. So I sectioned, and welded in some tube, and lengthed the shifter to the length I wanted, then used steel rod in place of the plastic dowel that Chevy used for the plunger to shift. works good, but im wanting to go to a less mechanical, less moving parts shifter.

Bluejeep- Agree on cost and avail of T-case-- but I've got a nice chunk of $$ into this one with the SYE and so forth

I'll cehc

sorry 1 yr old hit keyboard-- I'll check into that adjustment Jamus-- hopefully that will make it right-- hope it nots internal--

SYE from a 231J will fit in a 231C, so you're not out anything there.