2nd, 3rd, and 4th gear lockup?!

[James614]

Quoted from this site's Turbo review of a '91 SS:

The Legacy Sport Sedan electronic transmission is uprated to handle increased torque. Changes include a larger microprocessor-controlled lock-up torque converter which controls lock-up in second, third, and fourth gear;

Is this true? I read on one of Josh's scans that they changed the shift mapping for the 92-up transmissions, raising shift points and modifying lockup. And my wife's 91 L definitely gets into 4th locked much more readily than my '93 L did or my '93 TW does. But I've never experienced any locking outside of overdrive on any Subby. But then again, I've never ridden in a '91 turbo.

If I could swap in a '91 turbo TCU and get 2nd/3rd lockup that'd be freakin' sweet. I've already been kind of itching for a '90/'91 TCU just for the earlier overdrive lockup.

[Legacy777]

You could try it. I don't see why it would cause any harm.

[James614]

I'd definitely try it if I ever came accross a '91 SS in the 'yard (I have better chances of winning the lottery, though). My main question was if anyone with a 4EAT '91 SS knows if it actually locks up in 2nd and 3rd. Otherwise, I can just go after any '90/'91 TCU for the earlier 4th lockup.

[AWD_addict]

I have a '90 TCU from an NA and another TCU from a turbo wagon. I drove them back to back, and there didn't seem to be much of a difference. This was only on dry roads, and only with NA torque being put through an NA 4EAT.

I'll sell you both TCUs if you want to experiment!

[555BCTurbo]

I believe I have 2 Turbo TCUs that could be had for VERY cheap...both work too!

[jeffast]

hrm, i can say almost for certain that my 92's tq converter has never locked up in any gear but 4th and even then you can tell it takes some effort