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racprops · 03-17-2021, 04:04 PM

My latest “Great Idea” Better MPG with super double Over Drives:

Was able to get an old US Gear Dual Range over drive (Org Doug Nash unit) at a good price.

I am looking for parts for this unit. And someone whom can work in it. It was not made to fit a TH400, I did not get the front adapter.

I need the input shaft for a TH400/4L80, and the 400 to US Gear adapter, and would also like the parking brake rear adapter.

I really wanted one of these as they seem to be nearly the best aftermarket Over Drive units.

I wanted it for my 93 Custom Chevy G20 Van to run behind my new rebuilt low RPM 383 both to lower the cruse RPMs and in my belief my special engine will give me better than the old stock 350’s 14MPG.

I was going to clob together an old Borg Warner over drive to run behind my van’s weak 4L60 both transmissions I feared that both might fail on a road trip and both I felt could NOT be used to tow anything. I was making plans on how to remove or replace either one on a road trip…not a good way to travel.

I am now putting in a 4L80E main transmission and want to run the US Gear overdrive which both I believe are so strong I will not fear any failure due to being weak, and now means I can tow, and do so in 3rd gear and with the US gear handling the overdrive.

The good thing is these are gear to gear, no lower minimum speed limits, and no problem backing up, (BW and GV) and no front oil pump, no cone clutch and no such weakness as those. (GV)

I am considering adapting the rear parking break to the US Gear over drive (they did make them too) so I can add rear disk brakes and not worry about their parking brakes.

03-17-2021, 04:04 PM	#1 (permalink)
racprops Master EcoModder Join Date: Oct 2009 Location: Phoenix AZ Posts: 799 Thanks: 4 Thanked 66 Times in 58 Posts	Dual over drives My latest “Great Idea” Better MPG with super double Over Drives: Was able to get an old US Gear Dual Range over drive (Org Doug Nash unit) at a good price. I am looking for parts for this unit. And someone whom can work in it. It was not made to fit a TH400, I did not get the front adapter. I need the input shaft for a TH400/4L80, and the 400 to US Gear adapter, and would also like the parking brake rear adapter. I really wanted one of these as they seem to be nearly the best aftermarket Over Drive units. I wanted it for my 93 Custom Chevy G20 Van to run behind my new rebuilt low RPM 383 both to lower the cruse RPMs and in my belief my special engine will give me better than the old stock 350’s 14MPG. I was going to clob together an old Borg Warner over drive to run behind my van’s weak 4L60 both transmissions I feared that both might fail on a road trip and both I felt could NOT be used to tow anything. I was making plans on how to remove or replace either one on a road trip…not a good way to travel. I am now putting in a 4L80E main transmission and want to run the US Gear overdrive which both I believe are so strong I will not fear any failure due to being weak, and now means I can tow, and do so in 3rd gear and with the US gear handling the overdrive. The good thing is these are gear to gear, no lower minimum speed limits, and no problem backing up, (BW and GV) and no front oil pump, no cone clutch and no such weakness as those. (GV) I am considering adapting the rear parking break to the US Gear over drive (they did make them too) so I can add rear disk brakes and not worry about their parking brakes.