You should get better gas mileage on the highway with the 4-speed because of the extra higher gear. Your cruising speed will have a lower engine RPM.

If the transmission ends in L it is mechanic rather than transmissions that end in E which are electronically controlled, so it may not need a different computer. The neutral start switch mounted on the outside of the transmission might have a different wire connector or it might be the same.

You might want to look on ebay for a factory repair manual and wiring diagram. You can find the repair manual for $40-50 usually. This will save you time in the long run if you are doing the swap yourself.

1991 Toyota Corolla OEM Repair Manual | eBay

1991 Toyota Corolla OEM Repair Manual. Condition is Used. Shipped with USPS Media Mail.

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1991 Toyota Corolla Service Shop Repair Manual | eBay

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You might want to do a search for it as well, as Amory2 installed a 4 speed AT into his own car after he found some issues from the PO. You might want to go thru his thread, as he covers a few things you might not think about.

 

I think LEs and SR5s are more likely to have four speeds. Yeah just search my threads, PO put in an A240L but didn't bolt it together very well, so it began to separate & cracked the flexplate. That was the loud thunk on startup when I bought it. XD

I bugged DrZ, Clone and others on here quite a bit and owe them a lot.

 

Hey, no problem. As long as you got it all working, we're happy for you.