TH350 question

Alan Roehrich · 12-26-2024, 10:40 AM

A couple of companies build light weight internal stuff for the TH350. ProTrans I believe is the one using the Chrysler pieces. I'd ask around about them, see who owns their stuff. Coan makes an XLT package. I always used the ATI aluminum pieces, with a TH250C shell and output shaft.

J.R. Haddad · 12-26-2024, 01:02 PM

Pro Trans does in fact use Mopar pieces in their 350 TH Trans. I have one
and it has been fast and flawless. I don't know how it came about, if the
Smith family already had had all the Chrysler pieces, as originally they
only built Mopar transmissions, and they were an easy retro-fit to the 350 case,
or if the GM pieces were so heavy that it was worth getting the Mopar
pieces to fit, or a combination of both. Opening one of their transmissions
is like opening up a work of Art. Absolutely beautiful work inside.

J.R.

Charles Stewart · 12-26-2024, 03:54 PM

Thanks Mr. Alan Roehrich and Mr. J.R. Haddad for those information.
This will help me a lot more that you may think...
Keep on,

GTX JOHN · 12-27-2024, 12:15 AM

They are now operating out of Waco Texas.

rsalemi · 12-27-2024, 09:31 AM

AMC in 80's used the Chrysler 904 trans with a chevy bolt pattern behind the GM 4 cylinder. Bolts right up to a chevy V8 block and all the internals are 904. They also used a 2.74 low gear instead of the 2.45 standard.

Kevin Love · 12-27-2024, 02:00 PM

Pro trans also did a Ford C-6 with 904 internals . It was the desired piece until NHRA allowed the C4 to be used in all Fords

Adger Smith · 12-27-2024, 08:15 PM

rsalami,
How do you tell the Mail truck transmissions that have the 2.74 low gear from the mail truck transmissions that have 2.45 with out disassembling.
I have 2 of those mail truck transmissions with converters and on the outside they look identical to me.

12-26-2024, 10:40 AM	#1
Alan Roehrich Veteran Member Join Date: May 2006 Location: Murfreesboro TN Posts: 5,105 Likes: 1,564 Liked 1,789 Times in 408 Posts	Re: TH350 question A couple of companies build light weight internal stuff for the TH350. ProTrans I believe is the one using the Chrysler pieces. I'd ask around about them, see who owns their stuff. Coan makes an XLT package. I always used the ATI aluminum pieces, with a TH250C shell and output shaft. __________________ Alan Roehrich 212A G/S

12-26-2024, 01:02 PM	#2
J.R. Haddad Senior Member Join Date: Jun 2012 Posts: 784 Likes: 935 Liked 1,464 Times in 307 Posts	Re: TH350 question Pro Trans does in fact use Mopar pieces in their 350 TH Trans. I have one and it has been fast and flawless. I don't know how it came about, if the Smith family already had had all the Chrysler pieces, as originally they only built Mopar transmissions, and they were an easy retro-fit to the 350 case, or if the GM pieces were so heavy that it was worth getting the Mopar pieces to fit, or a combination of both. Opening one of their transmissions is like opening up a work of Art. Absolutely beautiful work inside. J.R.

12-26-2024, 03:54 PM	#3
Charles Stewart Member Join Date: Jul 2016 Posts: 389 Likes: 1,655 Liked 753 Times in 213 Posts	Re: TH350 question Thanks Mr. Alan Roehrich and Mr. J.R. Haddad for those information. This will help me a lot more that you may think... Keep on,

12-27-2024, 12:15 AM	#4
GTX JOHN VIP Member Join Date: Jun 2009 Location: Boulder City, Nevada 89005 Posts: 2,731 Likes: 2,794 Liked 2,471 Times in 696 Posts	Re: TH350 question They are now operating out of Waco Texas. __________________ John Irving 741 Stock 741 Super Stock

12-27-2024, 09:31 AM	#5
rsalemi Junior Member Join Date: Dec 2003 Location: RI Posts: 23 Likes: 0 Liked 23 Times in 10 Posts	Re: TH350 question AMC in 80's used the Chrysler 904 trans with a chevy bolt pattern behind the GM 4 cylinder. Bolts right up to a chevy V8 block and all the internals are 904. They also used a 2.74 low gear instead of the 2.45 standard.

12-27-2024, 02:00 PM	#6
Kevin Love Member Join Date: Jan 2002 Location: canada Posts: 113 Likes: 5 Liked 19 Times in 10 Posts	Re: TH350 question Pro trans also did a Ford C-6 with 904 internals . It was the desired piece until NHRA allowed the C4 to be used in all Fords __________________ Kevin Love 5666 STK/SS

12-27-2024, 08:15 PM	#7
Adger Smith VIP Member Join Date: Dec 2001 Location: Texarkana Ark/TX Posts: 2,446 Likes: 575 Liked 880 Times in 311 Posts	Re: TH350 question rsalami, How do you tell the Mail truck transmissions that have the 2.74 low gear from the mail truck transmissions that have 2.45 with out disassembling. I have 2 of those mail truck transmissions with converters and on the outside they look identical to me. __________________ Adger Smith (Former SS) Last edited by Adger Smith; 12-27-2024 at 08:17 PM. Reason: sp