Slant Six Forum :: From stick to auto

I like the A-999 auto transmission with the lockup tranny for gas mileage. It has lower first and second gear ratios but the same final drive ratio and it has a lockup tranny. This means you can run 2.9 gears but still have okay accelleration but cruise at low RPMS.

Yes and no. THere was never a factory slant six specific four speed automatic offered, but, you can use the 64-67 A-100 and D series truck/van transmission adapter plate assembly to bolt an A-500 or A-518 automatic overdrive for a smallblock to the back of the slant. This is a rather expensive proposition since the adapter plates are rare, and the A-500 transmiussions are expensive.

That sounds a bit like what a Mopar guy at a local Advance was telling me. There seems to be an overdrive unit I could buy that will go in in place of the tail cone on my manual. To the tune of $2300!

Thanks

Quote:

Sounds like he was talking about a Gear Vendors unit, maytbe?

Automatics soak up like 2-3 times the horsepower

sorry if this sounds like a stupid question ross, but why would you want to swap from a stick to an auto for mileage? if the car is already a 4 speed (or a 3 speed on the floor for that matter) wouldn't a 4 speed overdrive trans be the better choice?

automatics tend to be heavier and soak up like 2-3 times the horsepower (less efficient) to drive them.

in case you haven't heard, there is also T-5 5-speed bellhousing in the works and it's a very nice piece.

-james

Author:	RossKinder [ Fri Jun 09, 2006 1:04 pm ]
Post subject:	From stick to auto
Is there any automatic trans that would get good mileage in my '65 Valiant?

Author:	Reed [ Fri Jun 09, 2006 1:08 pm ]
Post subject:
I like the A-999 auto transmission with the lockup tranny for gas mileage. It has lower first and second gear ratios but the same final drive ratio and it has a lockup tranny. This means you can run 2.9 gears but still have okay accelleration but cruise at low RPMS.

Author:	RossKinder [ Fri Jun 09, 2006 3:07 pm ]
Post subject:
Quote: I like the A-999 auto transmission with the lockup tranny for gas mileage. It has lower first and second gear ratios but the same final drive ratio and it has a lockup tranny. This means you can run 2.9 gears but still have okay accelleration but cruise at low RPMS. Thank you.

Author:	RossKinder [ Sat Jun 10, 2006 11:33 am ]
Post subject:
Quote: I like the A-999 auto transmission with the lockup tranny for gas mileage. It has lower first and second gear ratios but the same final drive ratio and it has a lockup tranny. This means you can run 2.9 gears but still have okay accelleration but cruise at low RPMS. I'm going to assume this is probably a stupid question, but . . . Is there such a thing as an automatic trans with OD for these things?

Author:	Reed [ Sat Jun 10, 2006 1:15 pm ]
Post subject:
Yes and no. THere was never a factory slant six specific four speed automatic offered, but, you can use the 64-67 A-100 and D series truck/van transmission adapter plate assembly to bolt an A-500 or A-518 automatic overdrive for a smallblock to the back of the slant. This is a rather expensive proposition since the adapter plates are rare, and the A-500 transmiussions are expensive.

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From stick to auto https://www.slantsix.org/forum/viewtopic.php?t=17977	Page 1 of 1

Author:	sandy in BC [ Sat Jun 10, 2006 9:05 pm ]
Post subject:
......and it wont fit in your trans tunnel....at all.

Author:	RossKinder [ Sun Jun 11, 2006 9:25 am ]
Post subject:
Quote: Yes and no. THere was never a factory slant six specific four speed automatic offered, but, you can use the 64-67 A-100 and D series truck/van transmission adapter plate assembly to bolt an A-500 or A-518 automatic overdrive for a smallblock to the back of the slant. This is a rather expensive proposition since the adapter plates are rare, and the A-500 transmiussions are expensive. That sounds a bit like what a Mopar guy at a local Advance was telling me. There seems to be an overdrive unit I could buy that will go in in place of the tail cone on my manual. To the tune of $2300! Thanks

Author:	Reed [ Sun Jun 11, 2006 10:06 am ]
Post subject:
Quote: That sounds a bit like what a Mopar guy at a local Advance was telling me. There seems to be an overdrive unit I could buy that will go in in place of the tail cone on my manual. To the tune of $2300! Thanks Sounds like he was talking about a Gear Vendors unit, maytbe?

Author:	RossKinder [ Sun Jun 11, 2006 10:34 am ]
Post subject:
Quote: Quote: That sounds a bit like what a Mopar guy at a local Advance was telling me. There seems to be an overdrive unit I could buy that will go in in place of the tail cone on my manual. To the tune of $2300! Thanks Sounds like he was talking about a Gear Vendors unit, maytbe? Ah, I think you're right. I didn't realize then that Gear Vendors was not gear vendors. Thanks

Author:	james longhurst [ Mon Jun 12, 2006 6:33 am ]
Post subject:
sorry if this sounds like a stupid question ross, but why would you want to swap from a stick to an auto for mileage? if the car is already a 4 speed (or a 3 speed on the floor for that matter) wouldn't a 4 speed overdrive trans be the better choice? automatics tend to be heavier and soak up like 2-3 times the horsepower (less efficient) to drive them. i'm thinking it would also be cheaper. in case you haven't heard, there is also T-5 5-speed bellhousing in the works and it's a very nice piece. -james

Author:	SlantSixDan [ Mon Jun 12, 2006 8:24 am ]
Post subject:
Quote: Automatics soak up like 2-3 times the horsepower I'd need to see a couple of very credible documents before I'd believe that assertion. There is some parasitic power consumption associated with automatics (e.g., to drive the pump), but I seriously doubt it's anywhere near 2x-3x the parasitic losses in a manual trans.

Author:	Reed [ Mon Jun 12, 2006 8:28 am ]
Post subject:
Most comparisons I have seen rate the stick at 1-3 more MPG in an identical car.

Author:	RossKinder [ Mon Jun 12, 2006 9:07 am ]
Post subject:
Quote: sorry if this sounds like a stupid question ross, but why would you want to swap from a stick to an auto for mileage? if the car is already a 4 speed (or a 3 speed on the floor for that matter) wouldn't a 4 speed overdrive trans be the better choice? I quite agree. But I don't have a 4-speed. I have a noisy 3-speed stick I'd like to replace. Having been a hard core stick user since I drove an old Farmall Regular tractor when I was 12 (at least a decade ago?), I'm almost ready to let someone else do the shifting for me. And the thought occurred to me as a long shot that there might be an auto that could be worth having. But I haven't traveled very far past the end of my nose in a long time and if I'm gonna fix that I'd probably better stick with stick as you say. Just a wild flight of delirium. I'd dance a jig to have an A-833 OD in there right now. I have to do a lot of research and ask a lot of questions, because like many people I have to get it right and spend it once. Quote: automatics tend to be heavier and soak up like 2-3 times the horsepower (less efficient) to drive them. I never heard of figures like that before. Quote: in case you haven't heard, there is also T-5 5-speed bellhousing in the works and it's a very nice piece. -james I've heard about a shop converting some other bells to something. Is that what you're talking about? But I don't seem to be smart enough to even find any T5's around. If I knew exactly which cars to look in I could probably find several. But guys around here seem to think I've lost my mind if I ask about T5. Maybe if I could say, "That thing attached to the back of the engines of . . ." I think local yard guys are getting either too young to know or too old to care anymore. Thanks

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