The 231HD has a chain that's 1.25 inch's wide. The 231d has a 1 inch chain. My truck 2001, ADJ Heavy Duty Service Group,
AHC Trailer Tow Group, DHKS Shift-on-the-Fly,231HD Transfer Case, NHBP Auxiliary Transmission Oil Cooler, NMCP Heavy Duty Engine Cooling, SFBS Front Heavy Duty Shock Absorbers
SGBS Rear Heavy Duty Shock Absorbers, ZBSP Spring - Left Rear, ZHDP Spring - Left Front, ZPSP Spring - Right Rear, ZWCP Spring - Right Front, Z6BS GVW Rating - 6600#

 

Wondering if the 231 in a jeep has the same internals as a 231D? There’s an aftermarket for the jeep transfer cases, not so much on dodge transfer cases though.

 

How did your t-cases cracked? Picture is worth of a thousand words.

 

Is your truck lifted? If so, might want to check U-joints and driveshaft angle. You shouldn't be cracking up 231 transfer cases with just high speeds...

 

It is not lifted, I just put the new transfer case in last night and front U-Joints were shot. I just replaced them about 2 months ago. Got the front driveshaft off of it for now.

 

Do you have any photos showing the broken transfer case that you can share with us?

 

I went through this same thing (cracking 231's). I have a 7"+ suspension lift however, with a clocking ring although that does nothing with the rear driveshaft angle. The thing I attributed it to was very worn U-joint at the rear axle. The needles had literally become rusty dust. When I checked them with the driveshaft in there was absolutely no play, so it may be worth giving them a good inspection with the rear driveshaft removed. The t-cases both cracked right where the bearing housing bolts to the rear half of the case. Are you getting any vibration in the floor boards at high speed? 70 mph and up is when I noticed my foot start to go numb, I should have looked into it sooner but I attributed it to 37" MT's on pavement at those speeds.

 

May not be as simple as that. 241DLDs had a number of different input shafts/lengths,based on input bearing thickness, year, and internal planetary gear cut. Problem 1.
Spline count was 29 for diesels and manual V-10s, 23 for gas 2500s. Problem 2.
OBD I obviously different than OBD II. OBD II took speed from rear differential. Flange mount front driveshaft.
Just need to find someone who has already done it.

 

OBDII started in 96, the VSS moved to the rear axle in 98.

 

Yes, fair enough. If you are looking for a '95 241DLD as I was, '94-'97 is the one of the categories the rebuilders supply.
Buried my truck in a Cat track fireguard with 2000lb of water and pump onboard, while working a fire here in B.C. Stripped the T-Case planetary working it back out sounds like.
The '96 V-10 I took parts from was technically OBDII, but v.1 or something, same 'analog' dash as my '95 almost identical sensor/computer setup. '98 and up are far more complex and I suppose capable.