1) Thou Shalt Not Double-Post. i didnt double post. on purpose...
2) Thou Shalt Make Every Effort to put Thy Thread in the Correct Section (this is an OEM issue - it's still the original transmission, without modification. Ergo, OEM Tech.)
I can almost forgive youth for the first - after all, "Youth is wasted on the young..."
Having said all that - it's the "spinning all four tyres" that has me wondering. What mode were you in on the transfer case? That little datum would be just as useful as details of you drivetrain setup - because in 2WD, you shouldn't be able to chirp all four tyres (and, if you have an NP231, running it on dry pavement in 4HI or 4LO isn't a good idea from the off.) i was on a dirt hill. and 4 hi.
There are three solenoids in the AW4 - one to control torque converter clutch (TCC) lockup, and two to shift through the forward ranges (similar to counting in binary, although the truth table differs.) If it's a Reverse issue, it's likely either valve body or clutches. If it's all ranges, that has to be sorted (with more information than you have given so far.)
Basic questions:
- Year/engine/trans/tcase? You're saying it's an AW4 - which usually means the 6-242 engine, but I believe the 4-150 got the AW4 in short order as well. Both the NP231 and NP242 transfer cases can be found behind the AW4 transmission. (Depending on the year, the NP231 also implied a vacuum-operated CAD setup on the front axle.) 1993/4.0/ aw4/np231
- When you overhauled the AW4, did you put any sealer on the valve body gaskets? You should not have - doing so can result in clogging the valve body hydraulic control passages.no sealer on the valve body.
- Did you replace the clutches as part of the overhaul? yes
- Was this AW4 your first slushbox overhaul? It's a relatively simple box, but I don't recomment it for the novice builder (cut your teeth on something more forgiving - like the THM350/400/700R4, Ford C4, or Chrysler A904/999. Doing an AW4 as a first overhaul is usually asking for problems.) yes first overhaul with my dad who has done automatics before.
- How clean was the area where you overhauled the box, and kept the parts? The correct answer is "surgical," or close to it. Automatics in general don't like lint or crud being built into them. not quite surgical but as clean as it could possibly be. in my garage.
- And, we need more of your symptoms to help to isolate the problem. How much have you drive-tested the thing? Able to replicate the issue? Able to replicate the issue using the same set of conditions? (Yes, that's important!)
