TSMaGoo

Wow, awesome! Thank you! Makes complete sense. And you answered my follow-up question if I’d run into any wiring/communication issues. And yeah, I hear ya about parting out Comanches! About this ’90 MJ though: the reason I picked this one up was out of complete convenience and it only cost $360 (if that tells you anything about the condition). This truck was far from running and driving! Interior a mess, no floorboards, tons of components missing from the engine, wiring harness cut out, etc. There wasn’t a front driveshaft when I bought it but I obviously didn’t care about that, but what I didn’t notice was someone had previously stole the axel shafts out of it. So the front end was pretty useless to me at this point! The rotors were too thin to turn, the calipers were so rusted that the bleeder screw sheared off when I tried opening it… One fail after another! Long story short – the only parts I’m able to salvage off this truck is the tranny, t-case, and rear driveshaft. And it’s a complete gamble on the tranny/t-case since I have no idea the true condition (odometer reads 225K). I did end up throwing a junkyard Dana 30 from a ’97 XJ in my ’91 and that went pretty well, I’ve been driving it around like that for about a month now with no issues. But I’m looking into doing the rest of the job this upcoming week, hence the question. And just to go full circle on this, when I’m done with the ’90 MJ, I’m trailering it up to a guy in upstate NY so he can take what he needs. The box has some rot, but it’s better than anything you can find in NY! But anyway, thanks again for the response!

Hey guys, new member here! If this has already been answered somewhere then I apologize, I have not been able to find it! So I’m trying to figure out if the flexplate follows the engine year or the transmission year. I’ve got a ’91 MJ, 4.0, auto, 2wd, column shift, short bed, etc. I recently grenaded a wheel bearing and ruined a spindle, so decided to go ahead and do a 4wheel swap. I bought an almost exact 1990 Comanche but 4x4 and worse body to part out. In doing some research I noticed flexplates are listed by ’87-’90 then ’91-’00. Both seem to have the same specs (164 teeth, 13.83” OD, 12-14 pitch) but have two different part numbers, different weights, and two very different prices. So if I’m using the 1990 transmission/transfer case but keep the 1991 engine, which flexplate do I need to use?? Thank you in advance!