tom58c

With this jeep before, it was not using the factory cooler in the radiator. Just straight lines running to the factory cooler and it worked fine the few years the engine was running for me. I installed the new cooler the same way.

I have been going by this. http://www.scribd.com/doc/97292423/Aisin-Warner-AW4-Automatic-Transmission Just so people know.

I changed the filter before installing the transmission with the motor. I don't know if its sealing properly. It appeared to be when I bolted it down to the valve body. What I was told by a friend today to check the fluid level in neutral instead of park. He had a similar problem and there was a 2 quart difference in fluid level between park and neutral. Did some reading and across many forums and it was being said there is no difference between P and N. Did this little test just to see ( my luck works weird that way ). As the forums said, there was no difference. The only thing that could change the fluid level would be the larger transmission cooler I installed to get rid of the overly small factory cooler. Knowing I wasn't going to drive the jeep I just added fluid anyway just too see if it would react different. I can drain the fluid back out easy enough. Didn't change anything other then with the TCU unplugged it would go into reverse without going to drive first. Once plugged back in same story. No reverse. Just like neutral. As for the fluid pressure test I am going to have to hold off until I can get a gauge. It is sounding like if the pressures are low it still requires removing the transmission to fix the issue. Or just rebuilding the unit completely. Thats how my luck has been with past transmissions I have had to rebuild. Thanks for the reply Moses.

Hello. The last couple weeks I've been trying to figure out a problem I have with my aw4 in my 93 xj. Just rebuild the engine and everything is fine there. Its been over the course of 5 years. The transmission worked perfect when pulled and was sealed and wrapped up out of the elements the whole time. It was taken out because of the engine failing. In getting everything ready to go after breaking in the engine I go to reverse with no results. Just the engine idle picking up slightly .Go to drive and the transmission engages as it should. After checking voltages for the solenoids and what order they should be in, checking the shift cable adjustment, neutral safty switch and so on. Everything is in good working order. The next test was disconnecting the TCU. Once I did reverse doesn't work unless you go to drive first. Then rock it to reverse and it works. Only so long as you are moving while reverse engaged. Otherwise if you stop moving it looses reverse and the motor free revs like in neutral. I took the jeep on the road even with these problems to see what all the forward gears would do and how it would shift. Well, it shifted through all the gears and cruised at 65 with out issue. The shifts did feel pretty lazy though. After this, getting back from a actual drive I looked at the fluid level and condition. The level was right at full and no foaming. I have chased wires, ran voltage tests, tested without the TCU to test all the gears manually. The things that make reverse happen are solenoid 1 on, overdrive clutch, direct clutch, first reverse brake, and overdrive one-way clutch. I did all the gears in manual and also put the transmission in 1-2 and start moving in 1st gear, then let off the gas to see if it brakes instead of coasts. It brakes. Shifting through all the forward gear automaticaly and doing all the manual tests tells me the transmission should be in working order. So what am I missing? Could it be a terminal problem like O ring seals drying and craking from sitting for the 5 years. Or is it just something simple I'm over looking? Thanks for reading