Where to get a front pump for a 42RH (A500)

BB is right, the accumulator spring isn't a necessity. All it does is cushion the 1-2 shift. Nothing to do with the lockup. Sorry I never got back to you yesterday. I'm diabetic and got real sick. Just finally getting around again. I found that information and it actually can be an electrical problem. The computer sends a signal to the lockup relay which in turns activates the lockup solenoid that directs oil to the lockup function of the converter so any malfunction of that circuit such as a sticking solenoid or relay or computer issue can cause your problem. It also mentions it can be a problem in the VB such as a sticking switch valve, lockup valve, or fail safe valve. Since you already have it apart your best bet is to completely disassemble the VB and thoroughly clean it and check for worn/sticky valves. I don't know if there's a way to check for computer codes with it disassembled or not.

As mentioned the broken accumulator spring should have no effect on your problem but without it it may shift kinda stiff going into 2nd. If you need one PM me the dimensions. Most likely I have one that's real close and you can have it for shipping which will be about $5.

BTW: BronzeBee your correct that they didn't make a non lockup A500/42rh