700r4 swap (help) - The 1947 - Present Chevrolet & GMC Truck Message Board Network

72-396 · 02-26-2004, 09:27 PM

I have decided to swap out my th350 with a 700r. I have a 72 3/4 ton 4x4 th350 396. I have done a lot of research and what I have found is no one makes an adapter for my 205 to make it bolt up to a 700r4 I would need to use my current adapter. I have been told that I need to move my 205 back 1 7/8 ". Has anybody done this? I could really use some advice. Are there any other options besides moving the 205 t-case back.

Thanks Steve

bouncytruck · 02-26-2004, 09:48 PM

It is a common swap. Try Advanced Adapters.

72-396 · 02-26-2004, 11:44 PM

I spoke with advanced adapter and they do not make one.

**breeh** · 02-27-2004, 10:54 AM

You need to exchange the mainshaft in the TH700 with the one that Advace Adapters offers for this. You then use your TH350/Np205 adapter. You will need to slide the trans back or the engine forward. I chose to move the engine forward to give me more room for my HEI. Try doing a search. This topic has been covered a bunch.

72-396 · 02-27-2004, 11:16 AM

Thanks for your reply. I have been doing searches and have not found any on this aplication which seems odd. Most people say this is real common but I have yet to find a article with this swap.
I have search google yayoo and typed in all sorts of titles.
thanks again

bouncytruck · 02-27-2004, 01:54 PM

Ask the question on the message boards at ColoradoK5.com. I know there are several guys on that board that have made the swap. CK5 has an article on swapping out a TH350 for an SM465 but I don't see on on the TH350/700r4 swap.

Mark540 · 02-27-2004, 05:28 PM

Advances Adapters makes an output shaft that replaces the current one in the 700R4, the tailshaft is removed and the trans has to be completely disassembled to install it, then it mates up directly to the 350/205 adapter. the 700 is 1 7/8 longer than the 350 so the motor can be moved forward(preferred) or transfer moved back, which means changing lengths of the front and rear drive shafts.

72-396 · 02-28-2004, 12:23 AM

thanks for your help!

02-26-2004, 09:27 PM	#1
72-396 Registered User Join Date: Nov 2003 Location: tulsa ok Posts: 55	700r4 swap (help) I have decided to swap out my th350 with a 700r. I have a 72 3/4 ton 4x4 th350 396. I have done a lot of research and what I have found is no one makes an adapter for my 205 to make it bolt up to a 700r4 I would need to use my current adapter. I have been told that I need to move my 205 back 1 7/8 ". Has anybody done this? I could really use some advice. Are there any other options besides moving the 205 t-case back. Thanks Steve __________________ 1972 K20 custom camper 4x4 LWB 396 700r4 1965 chevy II 420 hp s/b 4 speed

02-26-2004, 09:48 PM	#2
bouncytruck SKINNY TIRES RULE! Join Date: Sep 2001 Location: Bothell, WA Posts: 11,049	It is a common swap. Try Advanced Adapters. __________________ bouncytruck 1972 K5 The Hauler 1994 K1500 Suburban The Daily2010 Kia Soul Wife's Ride2014 Fiat 500L

02-26-2004, 11:44 PM	#3
72-396 Registered User Join Date: Nov 2003 Location: tulsa ok Posts: 55	I spoke with advanced adapter and they do not make one. __________________ 1972 K20 custom camper 4x4 LWB 396 700r4 1965 chevy II 420 hp s/b 4 speed

02-27-2004, 10:54 AM	#4
breeh Recovering 67-72 Addict Join Date: Oct 2000 Location: North Bend, WA Posts: 1,788	You need to exchange the mainshaft in the TH700 with the one that Advace Adapters offers for this. You then use your TH350/Np205 adapter. You will need to slide the trans back or the engine forward. I chose to move the engine forward to give me more room for my HEI. Try doing a search. This topic has been covered a bunch. __________________ 68 Short Fleet 4x4; 427; BTO Level 3 700R4; NP205; Dana 60 front and rear; 4" lift with 35's; Disc brakes; AGR variable ratio steering; factory bucket seats; factory tach and tilt. "Friends call me cruzer cuz I like fast cars and fast women"

02-27-2004, 11:16 AM	#5
72-396 Registered User Join Date: Nov 2003 Location: tulsa ok Posts: 55	Thanks for your reply. I have been doing searches and have not found any on this aplication which seems odd. Most people say this is real common but I have yet to find a article with this swap. I have search google yayoo and typed in all sorts of titles. thanks again __________________ 1972 K20 custom camper 4x4 LWB 396 700r4 1965 chevy II 420 hp s/b 4 speed

02-27-2004, 01:54 PM	#6
bouncytruck SKINNY TIRES RULE! Join Date: Sep 2001 Location: Bothell, WA Posts: 11,049	Ask the question on the message boards at ColoradoK5.com. I know there are several guys on that board that have made the swap. CK5 has an article on swapping out a TH350 for an SM465 but I don't see on on the TH350/700r4 swap. __________________ bouncytruck 1972 K5 The Hauler 1994 K1500 Suburban The Daily2010 Kia Soul Wife's Ride2014 Fiat 500L

02-27-2004, 05:28 PM	#7
Mark540 Registered User Join Date: Feb 2003 Location: Fairborn,OH Posts: 203	Advances Adapters makes an output shaft that replaces the current one in the 700R4, the tailshaft is removed and the trans has to be completely disassembled to install it, then it mates up directly to the 350/205 adapter. the 700 is 1 7/8 longer than the 350 so the motor can be moved forward(preferred) or transfer moved back, which means changing lengths of the front and rear drive shafts. __________________ 1970 GMC Burb 4x4 - 68 Chevy Front, FI LT1, 4L60E 1970 Chevy Impala 47,000 miles 2001 BMW 540i 6-speed 2002 Dodge Ram 1500 4x4 w/20's

02-28-2004, 12:23 AM	#8
72-396 Registered User Join Date: Nov 2003 Location: tulsa ok Posts: 55	swap thanks for your help! __________________ 1972 K20 custom camper 4x4 LWB 396 700r4 1965 chevy II 420 hp s/b 4 speed



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