Chrysler A904 trans behind a SBC 350??? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

dlyons321 · 07-09-2022, 07:37 PM

Hey Guys,

I just picked up a sweet 70' K10 that had been sitting for a few years. Checked all the boxes for me. Original short bed descent shape etc. The PO has put TBI on a 350 which is fine for now (has some minor issues) After getting it home and crawling around I noticed the engine is backed by a Chrysler A904 Torqueflight transmission. Any idea the benefit of doing this? Ive read a few things online about it being done in some off-road forums but not sure if this was commonplace in the 70s or 80s. Does anybody have info on this setup?

geezer#99 · 07-09-2022, 07:59 PM

Nice pic of the truck but a pic of the trans and how it bolts up would help a lot.

dlyons321 · 07-09-2022, 08:03 PM

Bolts right up to the block no adapters from what I can tell. I haven't ventured outside to work on the truck today... 112 in Phoenix.

geezer#99 · 07-09-2022, 08:54 PM

Likely a turbo 350.
Pan looks the same.

RustyPile · 07-09-2022, 08:58 PM

No Chrysler transmission will bolt directly to an SBC without an adaptor, bolt pattern isn't even close.. Check again. Probably a TH350 or possibly a TH400. Post pictures of the installation.

dlyons321 · 07-09-2022, 09:59 PM

Here's a picture I took a week ago. Ill take a few more when the driveway cools down. Sorry about the orientation. It's stamped A904.

**mongocanfly** · 07-09-2022, 11:45 PM

need pic of trans pan
1st pic is t350...2nd is t400

**mongocanfly** · 07-09-2022, 11:49 PM

this is a 904 gasket

**The Rocknrod** · 07-10-2022, 09:55 AM

Quote:

Originally Posted by dlyons321

Here's a picture I took a week ago. Ill take a few more when the driveway cools down. Sorry about the orientation. It's stamped A904.

Look familiar? This is a pic I am posting as an example of a TH350.

Ziegelsteinfaust · 07-10-2022, 01:00 PM

https://board.moparts.org/ubbthreads...904-trans.html

It seems the 904 went behind iron dukes. So it is a easy swap to use a Dana 300 transfer case too. Which is almost as good as a 205. Or it.parts the guy had.

Bigdav160 · 07-11-2022, 09:55 AM

That A904 tag appears to be a rebuilder's tag that was added otherwise it looks like a GM transmission

**The Rocknrod** · 07-11-2022, 10:30 AM

Quote:

Originally Posted by Bigdav160

That A904 tag appears to be a rebuilder's tag that was added otherwise it looks like a GM transmission

It is.
This is a picture as an example of a TH350 drivers side view - and his pic of the alleged 904:

dlyons321 · 07-11-2022, 12:19 PM

Man you guys are good. After counting the pan bolts i'm on board with the fact that its a turbo 350 trans. I guess googling numbers on the side of the case doesn't always work out.

Accelo · 07-12-2022, 11:13 PM

It's not original to the truck as it's a THM 350 heavy case used on later 4x4's.
They did it right. If it's missing the converter cover it takes a solid aluminum cover with two bolts at the bottom of it that attach rods that extend up to the motor mounts.
Nice truck BTW.

**The Rocknrod** · 07-13-2022, 02:12 PM

Quote:

Originally Posted by Accelo

It's not original to the truck as it's a THM 350 heavy case used on later 4x4's.
They did it right. If it's missing the converter cover it takes a solid aluminum cover with two bolts at the bottom of it that attach rods that extend up to the motor mounts.
Nice truck BTW.

How can you tell?

Accelo · 07-13-2022, 08:01 PM

This flange is flat on the standard case.
The 4x4 has the bolt bosses on the flange for the heavy duty aluminum converter cover.
Pictured is the standard case. It requires a plastic or stamped steel converter cover.

**The Rocknrod** · 07-13-2022, 08:04 PM

Quote:

Originally Posted by Accelo

This flange is flat on the standard case.
The 4x4 has the bolt bosses on the flange.
Pictured is the standard case. It requires a plastic or stamped steel converter cover.

That is a pic I posted. His pic is the little one.

Accelo · 07-13-2022, 08:07 PM

Thanks for the correction, I missed that.
He can now identify both styles.

dlyons321 · 07-13-2022, 11:46 PM

looks like I've got some researchin' to do!

07-09-2022, 07:37 PM	#1
dlyons321 Registered User Join Date: Apr 2016 Location: Phoenix, AZ Posts: 9	Chrysler A904 trans behind a SBC 350??? Hey Guys, I just picked up a sweet 70' K10 that had been sitting for a few years. Checked all the boxes for me. Original short bed descent shape etc. The PO has put TBI on a 350 which is fine for now (has some minor issues) After getting it home and crawling around I noticed the engine is backed by a Chrysler A904 Torqueflight transmission. Any idea the benefit of doing this? Ive read a few things online about it being done in some off-road forums but not sure if this was commonplace in the 70s or 80s. Does anybody have info on this setup? Attached Images

07-09-2022, 07:59 PM	#2
geezer#99 Registered User Join Date: Aug 2009 Location: Bowser Posts: 13,508	Re: Chrysler A904 trans behind a SBC 350??? Nice pic of the truck but a pic of the trans and how it bolts up would help a lot.

07-09-2022, 08:03 PM	#3
dlyons321 Registered User Join Date: Apr 2016 Location: Phoenix, AZ Posts: 9	Re: Chrysler A904 trans behind a SBC 350??? Bolts right up to the block no adapters from what I can tell. I haven't ventured outside to work on the truck today... 112 in Phoenix.

07-09-2022, 08:54 PM	#4
geezer#99 Registered User Join Date: Aug 2009 Location: Bowser Posts: 13,508	Re: Chrysler A904 trans behind a SBC 350??? Likely a turbo 350. Pan looks the same.

07-09-2022, 08:58 PM	#5
RustyPile Registered User Join Date: Dec 2017 Location: Elkhart, Texas Posts: 1,524	Re: Chrysler A904 trans behind a SBC 350??? No Chrysler transmission will bolt directly to an SBC without an adaptor, bolt pattern isn't even close.. Check again. Probably a TH350 or possibly a TH400. Post pictures of the installation.

07-09-2022, 09:59 PM	#6
dlyons321 Registered User Join Date: Apr 2016 Location: Phoenix, AZ Posts: 9	Re: Chrysler A904 trans behind a SBC 350??? Here's a picture I took a week ago. Ill take a few more when the driveway cools down. Sorry about the orientation. It's stamped A904. Attached Images

07-09-2022, 11:45 PM	#7
mongocanfly Post Whore Join Date: May 2015 Location: Alabama Posts: 14,578	Re: Chrysler A904 trans behind a SBC 350??? need pic of trans pan 1st pic is t350...2nd is t400 Attached Images __________________ Mongo...aka Greg RIP Dad RIP Jesse 1981 C30 LQ9 NV4500..http://67-72chevytrucks.com/vboard/s...d.php?t=753598 Mongos AD- LS3 TR6060...http://67-72chevytrucks.com/vboard/s...34#post8522334 Columbus..the 1957 IH 4x4...http://67-72chevytrucks.com/vboard/s...63#post8082563 2023 Chevy Z71..daily driver

07-09-2022, 11:49 PM	#8
mongocanfly Post Whore Join Date: May 2015 Location: Alabama Posts: 14,578	Re: Chrysler A904 trans behind a SBC 350??? this is a 904 gasket Attached Images __________________ Mongo...aka Greg RIP Dad RIP Jesse 1981 C30 LQ9 NV4500..http://67-72chevytrucks.com/vboard/s...d.php?t=753598 Mongos AD- LS3 TR6060...http://67-72chevytrucks.com/vboard/s...34#post8522334 Columbus..the 1957 IH 4x4...http://67-72chevytrucks.com/vboard/s...63#post8082563 2023 Chevy Z71..daily driver

07-10-2022, 01:00 PM	#10
Ziegelsteinfaust Registered User Join Date: Dec 2012 Location: Temple City Posts: 3,558	Re: Chrysler A904 trans behind a SBC 350??? https://board.moparts.org/ubbthreads...904-trans.html It seems the 904 went behind iron dukes. So it is a easy swap to use a Dana 300 transfer case too. Which is almost as good as a 205. Or it.parts the guy had.

07-11-2022, 09:55 AM	#11
Bigdav160 Registered User Join Date: Apr 2011 Location: Klein Texas Posts: 3,852	Re: Chrysler A904 trans behind a SBC 350??? That A904 tag appears to be a rebuilder's tag that was added otherwise it looks like a GM transmission __________________ My Classics: '72 K20 Suburban + '65 Dodge Town Wagon '72 Corvette Roadster +'67 Corvette Roadster '73 Z-28 Camaro '63 Ford SWB Uni Pickup '50 Ford Coupe

07-11-2022, 12:19 PM	#13
dlyons321 Registered User Join Date: Apr 2016 Location: Phoenix, AZ Posts: 9	Re: Chrysler A904 trans behind a SBC 350??? Man you guys are good. After counting the pan bolts i'm on board with the fact that its a turbo 350 trans. I guess googling numbers on the side of the case doesn't always work out.

07-12-2022, 11:13 PM	#14
Accelo Registered User Join Date: Mar 2015 Location: washington Posts: 2,151	Re: Chrysler A904 trans behind a SBC 350??? It's not original to the truck as it's a THM 350 heavy case used on later 4x4's. They did it right. If it's missing the converter cover it takes a solid aluminum cover with two bolts at the bottom of it that attach rods that extend up to the motor mounts. Nice truck BTW.

07-13-2022, 08:01 PM	#16
Accelo Registered User Join Date: Mar 2015 Location: washington Posts: 2,151	Re: Chrysler A904 trans behind a SBC 350??? This flange is flat on the standard case. The 4x4 has the bolt bosses on the flange for the heavy duty aluminum converter cover. Pictured is the standard case. It requires a plastic or stamped steel converter cover. Attached Images

07-13-2022, 08:07 PM	#18
Accelo Registered User Join Date: Mar 2015 Location: washington Posts: 2,151	Re: Chrysler A904 trans behind a SBC 350??? Thanks for the correction, I missed that. He can now identify both styles.

07-13-2022, 11:46 PM	#19
dlyons321 Registered User Join Date: Apr 2016 Location: Phoenix, AZ Posts: 9	Re: Chrysler A904 trans behind a SBC 350??? looks like I've got some researchin' to do!



Register or Log In To remove these advertisements.

Thread Tools
Show Printable Version Email this Page
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode

Register or Log In To remove these advertisements.