Modern Hemi, which OD auto?

[General23cmp]

I would prefer not cutting the tunnel on my 69 Sat, so I assume a modern OD is out of the running. What options are there that can handle the power, have engine/trans adapters available, etc? I know Gear Vendors can handle the backend side if starting with a 3 speed, but I still need to mate to front. With their 0.78 OD, I would like to consider other options with “more” OD. The 4L60E Chevy option may be the easiest route beyond Gear Venders to fit in the tunnel, but I still need to adapt to the engine. I’ve found adapters for going 4L60E to old big block mopar. Surely there are adapters for this.

Also, my car is a convertible, so I know there is likely more bracing somewhere. Am I going to run in more clearance issues than normal, or am I ok there?

Side note, my car is column shift, if I went 4L60E, how much work is it to make “PRND” work? I really don’t care about lower gear selection.

 

[Hey-O]

IMO, with the least amount of work, the GV is the best way to go. My GV took me from 3200 at 70, to 2400 at 70. My 65 coronet has a new school Hemi and a ram automatic and yes the tunnel needed work. With my set up now it's 1600 at 70. The 4L60E Chevy built is nice, but once you buy the GV ( around 2800 bucks ) it's the last overdrive you'll buy, I don't care how hard you drive it or how much HP you put in front of it, it's not going to break. You can get a 727 built cheaper and if you do break it the cost is earier to handle than a built 4L60E. To keep things original on your car, no points are deducted for having a GV overdrive.

 

[theman440]

A500

 

[5.7 hemi]

Or the 518, which would handle more power.

 

[General23cmp]

Or the 518, which would handle more power.

Doesn’t it require tunnel work?

 

[493 Mike]

Doesn’t it require tunnel work?

Yes.
Mike