Here's the low-down...
87 AW4/NP231 combo behind 4.0L swapped into Jeep Wrangler. Everything was kosher until 6mths ago when the rear driveshaft blew a u-joint at 70mph! Twisted the rear driveshaft, shattered the NP231 cone (was slip yoke style). Swapped in used cone and rebuild a driveshaft to work. Test drove showed major vibration, second look underneath revealed carnage to the trans/tcase adapter (tcase was attached by 1 of 6 bolts!!). At this point the YJ was still limpable, we were only up the street from the house - so we backed it into the garage to future work.
This past weekend, swapped in a NP231 w/ SYE and had custom driveshaft made. Also swapped in used adapter between the trans/tcase. Trans has 130k+ miles on it so we drained fluid and replenished with new Dextron III. Started YJ and nothing. Checked for leaks, nothing, ran for few minutes (build up temp), check fluid on dip stick - ice cold & no change! Spent hrs going through service manual, checking shift linkage, throttle cable adjustment, did manual test (remove TCU fuse), still nothing. Drained fluid, removed pan to check park rod/pawl - without removing valve body it appears to be functioning (I cannot move the output shaft when it is in park and can move it when it is in other gears). Reinstalled pan with new gasket - another refill of fresh fluid - still nothing. Performed pressure test - notta! Removed inspection plate and checked torque converter - it is attached to the flex plate - no probs there. Any idea's on what could have happened?
I'm wondering if its possible the oil pump has broken - I don't hear/feel anything grinding, nor were there any metal shavings inside the pan (at the magnets).
-Chris
87 AW4/NP231 combo behind 4.0L swapped into Jeep Wrangler. Everything was kosher until 6mths ago when the rear driveshaft blew a u-joint at 70mph! Twisted the rear driveshaft, shattered the NP231 cone (was slip yoke style). Swapped in used cone and rebuild a driveshaft to work. Test drove showed major vibration, second look underneath revealed carnage to the trans/tcase adapter (tcase was attached by 1 of 6 bolts!!). At this point the YJ was still limpable, we were only up the street from the house - so we backed it into the garage to future work.
This past weekend, swapped in a NP231 w/ SYE and had custom driveshaft made. Also swapped in used adapter between the trans/tcase. Trans has 130k+ miles on it so we drained fluid and replenished with new Dextron III. Started YJ and nothing. Checked for leaks, nothing, ran for few minutes (build up temp), check fluid on dip stick - ice cold & no change! Spent hrs going through service manual, checking shift linkage, throttle cable adjustment, did manual test (remove TCU fuse), still nothing. Drained fluid, removed pan to check park rod/pawl - without removing valve body it appears to be functioning (I cannot move the output shaft when it is in park and can move it when it is in other gears). Reinstalled pan with new gasket - another refill of fresh fluid - still nothing. Performed pressure test - notta! Removed inspection plate and checked torque converter - it is attached to the flex plate - no probs there. Any idea's on what could have happened?
I'm wondering if its possible the oil pump has broken - I don't hear/feel anything grinding, nor were there any metal shavings inside the pan (at the magnets).
-Chris