Who makes the best power window conversion kit for a 1970 Cutlass Supreme?

 

Sort of seriously, GM from an A body of the same vintage and same number of doors.

I did this in my ‘66 Starfire. There’s no such thing as kits for that as far as I know, so I just retrofitted correct factory parts and they bolted up just like they should.

Power windows that work well are nice.

Cheers
Chris

 

PM sent

 

OEM is definitely "best" as far as being rugged and reliable, but you need to find them in good condition with tight joints.

There are several aftermarket options and some are terrible. It's pretty easy by looking at them - if it looks flimsy, or looks like it's likely to chew up the gears - then it is.

I ended up using the Nu-Relics kit, only on the front doors, as they seemed the most robust of the aftermarket at the time (2018). They work well but are a little slow rolling up and struggle to close all the way against the weatherstrip. Aftermarket motors tend to be small/weak.
Note that the front doors are the same as Chevelle. Quarter window glass is specific to each model and roofline, no idea if any of the mechanisms are shared.

 

Electric Life makes a nice kit
SPECIAL / SKYLARK, GRAND SPORT, CHEVELLE, MALIBU, MONTE CARLO, CUTLASS/442, GRAND PRIX, GTO, TEMPEST 2 DOOR AND CONVERTIBLE HARDTOP FRONT – Electric Life Power Window Systems & Accessories https://share.google/P5EYazNd6JV9h5kzK