Hi Guys, I have a 67 Satellite ,383 bored .30 over , light comp cam, competition carter 650, stock heads, 727 transmission, 323 gears posi. The car preforms well for the size and weight but i was thinking of maybe moving up to 410 gears. I use the car mainly for cruise nights or City driving but would like the option of longer highway cruises, i was wondering if anyone knows of a later transmission with overdrive that would bolt on without alot of custom work, also i would like to redo shocks, what do you suggest to use? thanks pete

 

Of course. It's the very same gearbox you have now, made in overdrive. I believe one out of a van or 2wd pickup is what you need

Here's how Chrysler (and Ford) did this. Be careful looking for these, as there are a few with GM bolt patterns and input shaft splines.

Ma took a "regular" A833 4 speed and re-did 3rd gear to be an OD gear. Then Ma took the front shift lever and TURNED IT upside down to reverse the throw of the 3-4 shift. That is, with an OD box, when you put the LEVER in 3rd, you are actually in the "old" FOURTH gear (straight through) position.

Then, when you put the LEVER in 4th, you are in the old THIRD gear which is now the OD gear

Easy to tell one of these boxes.

Get the box into neutral, IE you can move the input while holding the output stopped.

Put the box into the 3rd (4 speed) position. To do that rotate the FRONT shift shaft CLOCKWISE.

Now turn the input shaft carefully ONE exact turn while watching the output shaft

If the output turns LESS than one turn, you have a standard 4 speed

If the output turns MORE than one turn, you have an OD box.

There are differences in the front retainer. You may have to change the bell or have your bell machined to fit the OD box retainer.

Otherwise, with the correct clutch disk and yoke, which may be "same as yours" this should be a bolt in

Watch that you do NOT get a short shaft A body box

Frankly, I'd consider a compromise, depending on what tire size you run now. A 3.7--3.9 rear gear is a pretty fair compromise.

My old V code 70 RR ran G60 X 15 tires. It ran right at 3000RPM with a Dana 3.54. Those tires are 26.4" tall or so

 

For an auto. A518 It requires major surgery to the cross member Not impossible Just requires some custom work.. Check the Mopar Mags They installed an electronic 6 speed auto in a B body
Here's the 518
http://www.hotrod.com/howto/43323_mo...smission_swap/
A 4L80 swap is actually better with the lockup feature