justme
Well-Known Member
I want to switch to a od auto trans for my 66 /6 Valiant. What should I be looking for and where?
Looking for an anto od trans for a 66 /6 Valiant
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Automatic? The 500 series overdrives out of 2 wheel drive Dakota Pick ups can fit with modifications and some wiring, switches and the like. Nothing is plug and play.
The only auto OD would be the either a LA 42RH or a Chevy (forget the nomenclature) BUT to mate either to a slant, an adapter would be needsd. For example a slant to LA, an adapter was used64 to 66. Over at slant6.org there was a group buy on the Chevy to slant adapter. I’m using a 42RH in my 65 Dart but it will be mated to a 273. There are other consideration to use one of those OD’s
Dang, I forgot about the slant 6 having a different transmission. A 3 or 4 speed manual behind a slant might be an easier swap if the OP has a manual.
Professor Fate
Push the button, Max...
If you're looking for a bolt-in answer, it ain't happening.
The Mopar and GM overdrives will both require adapters or bellhousing surgery and replacement, both will require crossmember mods of varying degrees, and they'll both need modified or custom linkage and specific wiring to those transmissions. RH series Mopar ODs can be run stand-alone, RE series will require either a controller or a set of toggle switches wired in for controlling the functions. Mopar units will require floor pan/tunnel/crossmember mods, the GM will require a custom speedo cable, and *possibly* some tunnel mods in the tight confines of an early A tunnel.. Both will require a new custom driveshaft and a custom transmission mount.
Probably your best bet and the least amount of work would be a Gear Vendor's overdrive unit mounted to your existing 904. It will still require a new driveshaft and speedo cable, and POSSIBLY some tunnel mods, but still the least amount of work.
Dodge 3-Speed Auto - Gearvendors
The Mopar and GM overdrives will both require adapters or bellhousing surgery and replacement, both will require crossmember mods of varying degrees, and they'll both need modified or custom linkage and specific wiring to those transmissions. RH series Mopar ODs can be run stand-alone, RE series will require either a controller or a set of toggle switches wired in for controlling the functions. Mopar units will require floor pan/tunnel/crossmember mods, the GM will require a custom speedo cable, and *possibly* some tunnel mods in the tight confines of an early A tunnel.. Both will require a new custom driveshaft and a custom transmission mount.
Probably your best bet and the least amount of work would be a Gear Vendor's overdrive unit mounted to your existing 904. It will still require a new driveshaft and speedo cable, and POSSIBLY some tunnel mods, but still the least amount of work.
Dodge 3-Speed Auto - Gearvendors
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67Dart273
Well-Known Member
Even the RH/ RE Mopar ones require extensive rear crossmember surgery and may require a bit of floor pan mod
The only other option I know of MIGHT be a "Gear Venders" which is made to bolt in place of SOME Mopar tail housings. You will have to research that. So for that you'd need a factory Mopar auto and YOU MAY need to update it to a later model to fit the gear venders, don't know. IN ADDITION the early cars had small snouts on the torque converters meaning the pilot hole in the crank is also small.
I would ditch the idea. People drove slant powered cars for decades with no OD
The only other option I know of MIGHT be a "Gear Venders" which is made to bolt in place of SOME Mopar tail housings. You will have to research that. So for that you'd need a factory Mopar auto and YOU MAY need to update it to a later model to fit the gear venders, don't know. IN ADDITION the early cars had small snouts on the torque converters meaning the pilot hole in the crank is also small.
I would ditch the idea. People drove slant powered cars for decades with no OD
The short answer is nothing. Nothing is a bolt in and nothing will fit without major floor tunnel surgery and cross member surgery. You might check with the guys at Gill Welding to see if they offer some kind of adapter plate. They are Mopar and slant 6 guys. That would be my first step. Getting "whatever" transmission I chose to bolt to the engine. From there, it's all pretty much labor.
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