Three Speed to TH-350 - The 1947 - Present Chevrolet & GMC Truck Message Board Network

1978steven · 04-11-2005, 10:01 PM

I'm converting my 1971 Chevy LWB from three speed column shift to a TH-350 automatic. I have everything to do the swap, but I'm tring to find out if I will have to change out the three speed tranny yoke for the TH-350 tranny yoke?

Thanks,
Steven

RicksTrucks · 04-11-2005, 10:07 PM

I believe you do need an auto cross member

69 longhorn · 04-11-2005, 11:38 PM

the slipyolk should be the same (3 spd saginaw to 350T). if you are using the 6" tail 350T, the shaft will also be the proper lenght. Yes, as already mentioned, you will need an auto trans crossmember.....& will probably need to cut the old bell mount crossmember out. its not too bad a swap, best of luck.....crazyL

1978steven · 04-12-2005, 07:44 AM

I have the short tail th350 (I believe), auto cross member, auto column, all the linkage for the column, and flex plate. Still need to get the starter, radiator, and hard tranny lines.

So if I'm tracking you guys, the short tail I have will need a little bit longer drive shaft?

JimKshortstep4x4 · 04-12-2005, 08:26 AM

As 69 longhorn mentioned the drive shaft will be the right length to use as is
as long as you have the short tail 350.

Jim

**tnblazerk5** · 04-12-2005, 09:21 AM

dont forget to take the pilot bushing out of the end of the crank !!!

1978steven · 04-12-2005, 08:51 PM

I got it now!!!!

I was thinking the 6 inch tail shaft was the long tail........

I think I got it all... Thanks for the help everyone. I'l let you all know how it goes.

Steven

Johnny05 · 04-13-2005, 01:57 AM

Quote:

Originally Posted by 1978steven

I have the short tail th350 (I believe), auto cross member, auto column, all the linkage for the column, and flex plate. Still need to get the starter, radiator, and hard tranny lines.

So if I'm tracking you guys, the short tail I have will need a little bit longer drive shaft?

Don't forget the Torque converter..

1978steven · 04-13-2005, 07:35 AM

yup, got that too.......

04-11-2005, 10:01 PM	#1
1978steven Registered User Join Date: Oct 2004 Location: Currently New Windsor, NY but Texas is home Posts: 332	Three Speed to TH-350 I'm converting my 1971 Chevy LWB from three speed column shift to a TH-350 automatic. I have everything to do the swap, but I'm tring to find out if I will have to change out the three speed tranny yoke for the TH-350 tranny yoke? Thanks, Steven __________________ 2002 Silverado 2500HD LB7 CCSB LT EFI Live by Rob at ATP, Edge CTS Insight DSP 5 control, S&B CAI, PPE boost valve, Pro Fab AIH, AirDog II 165, PPE WIF sensor delete plug, 5" stainless exhaust, Cognito braces & HD tie rods, H2's 315/70 R17 BFG's 2004 Tahoe LT 2006 Silverado Z71 LS 1971 Chevy C10

04-11-2005, 10:07 PM	#2
RicksTrucks Senior Member Join Date: Jan 2005 Location: Claremore, OK 74017 Posts: 2,640	I believe you do need an auto cross member __________________ 68 Short Stepside C-10 69 SWB C-10 70 Flatbed C-20 70 LWB C-20 BB402 70 LWB C-10 CST 70 LWB C-10 CST 71 Short Stepside Cheyenne C-10 72 LWB C-10 72 Blazer 4x4 4spd 95 Jeep Cherokee 4x4

04-11-2005, 11:38 PM	#3
69 longhorn Registered User Join Date: Aug 2001 Location: rock island,il,usa Posts: 5,382	the slipyolk should be the same (3 spd saginaw to 350T). if you are using the 6" tail 350T, the shaft will also be the proper lenght. Yes, as already mentioned, you will need an auto trans crossmember.....& will probably need to cut the old bell mount crossmember out. its not too bad a swap, best of luck.....crazyL __________________ http://community.webshots.com/user/hotrodhorn

04-12-2005, 07:44 AM	#4
1978steven Registered User Join Date: Oct 2004 Location: Currently New Windsor, NY but Texas is home Posts: 332	I have the short tail th350 (I believe), auto cross member, auto column, all the linkage for the column, and flex plate. Still need to get the starter, radiator, and hard tranny lines. So if I'm tracking you guys, the short tail I have will need a little bit longer drive shaft? __________________ 2002 Silverado 2500HD LB7 CCSB LT EFI Live by Rob at ATP, Edge CTS Insight DSP 5 control, S&B CAI, PPE boost valve, Pro Fab AIH, AirDog II 165, PPE WIF sensor delete plug, 5" stainless exhaust, Cognito braces & HD tie rods, H2's 315/70 R17 BFG's 2004 Tahoe LT 2006 Silverado Z71 LS 1971 Chevy C10

04-12-2005, 08:26 AM	#5
JimKshortstep4x4 Senior Member Join Date: Jul 2001 Location: Muskegon,MI,USA Posts: 6,026	As 69 longhorn mentioned the drive shaft will be the right length to use as is as long as you have the short tail 350. Jim Last edited by JimKshortstep4x4; 04-12-2005 at 08:27 AM.

04-12-2005, 09:21 AM	#6
tnblazerk5 User #12137 Join Date: Apr 2004 Location: kingsport,upper east tenn Posts: 11,598	dont forget to take the pilot bushing out of the end of the crank !!!

04-12-2005, 08:51 PM	#7
1978steven Registered User Join Date: Oct 2004 Location: Currently New Windsor, NY but Texas is home Posts: 332	I got it now!!!! I was thinking the 6 inch tail shaft was the long tail........ I think I got it all... Thanks for the help everyone. I'l let you all know how it goes. Steven __________________ 2002 Silverado 2500HD LB7 CCSB LT EFI Live by Rob at ATP, Edge CTS Insight DSP 5 control, S&B CAI, PPE boost valve, Pro Fab AIH, AirDog II 165, PPE WIF sensor delete plug, 5" stainless exhaust, Cognito braces & HD tie rods, H2's 315/70 R17 BFG's 2004 Tahoe LT 2006 Silverado Z71 LS 1971 Chevy C10

04-13-2005, 07:35 AM	#9
1978steven Registered User Join Date: Oct 2004 Location: Currently New Windsor, NY but Texas is home Posts: 332	yup, got that too....... __________________ 2002 Silverado 2500HD LB7 CCSB LT EFI Live by Rob at ATP, Edge CTS Insight DSP 5 control, S&B CAI, PPE boost valve, Pro Fab AIH, AirDog II 165, PPE WIF sensor delete plug, 5" stainless exhaust, Cognito braces & HD tie rods, H2's 315/70 R17 BFG's 2004 Tahoe LT 2006 Silverado Z71 LS 1971 Chevy C10



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