I have a quick question for you guys. I had been looking into 242s but I just found a 231 for a decent price that I could get.
I have a 98 4.0 42re and 249 stock. I have a .840" input on my 249 case.
The 231 is out of a 93-94 ZJ with 4.0 42re and the thread says .840" inputs on these cases as well and looks like it in the picture to me too.
If both cases are ISY and have the 23 spline .840" input would it be a direct swap into my ZJ? (Not requiring driveshaft shortening or input, front case half, and planetary gear swap.)
If the inputs are the same length and spline counts the same on both tcases, but turned out to be earlier gear cut would it even matter to me? Would I need to swap the inputs, front case and planetarys for length and spline counts? Or is there some other issue with the gear cuts I dont know about? Im under the impression you would only need to swap the front case half and planetarys when you need to swap the input over between cases with different gear cuts. Is this correct?
I know all these questions probably have been asked and answered in this thread already but I am looking for a quick answer from the knowledgable members here.
edit: ok I found this but am confused on what the collar is this is referring to
"One other issue I've run into: 93-95 ZJ 231 and 242's with the .840 input have a metal collar pressed into the input shaft that mates to the bevel at the end of the transmission output shaft. 96+ transmissions do not have this bevel, meaning it is required to remove the input and either swap it, or you can easily take a deep well socket and tap the collar out along with the main shaft bearing. Reinstall the main shaft bearing into the input, making sure it is fully seated and that is the extent of the fix."