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Mod | | | Forums66 Topics128,101 Posts1,056,182 Members48,436 | | Most Online14,466
Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
Lots of work on Brad's part ... pure enjoyment (and references) for you!
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For helping keep this great
old truck web site
on the Internet for over 30 years! and not clogged down
with Ads!  Again, thanks!
| | | | Joined: Jul 2004 Posts: 5,708 'Bolter | | 'Bolter Joined: Jul 2004 Posts: 5,708 | Cub, I have been doing overdrive research myself, including calls to various manufacturers. Gear vendors stuff if neat, goes behind the existing tranny and actuates electrically. Advance Adapters makes the Ranger unit in a overdrive (27%) or an underdrive. These units mount between the bellhousing and existing tranny and actuate via a customer supplied shifter. They are about half the price of a Gear Vendors unit. They have a bolt up unit for the SM420 tranny. Do a Advance Adapter search!!
Atomarc. | | |
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