Swaping to a 700R trans - The 1947 - Present Chevrolet & GMC Truck Message Board Network

PGG · 05-23-2018, 10:39 AM

What is required to move the shifter back for this swap it had the stock TH350 since my engine was not the original I went with a GM crate motor and swapped to a 700R for the overdrive. The 4wd shifter will need to be moved back any tips on how to do it right?
Thanks PG

**Blazerowner** · 05-23-2018, 11:14 AM

Move the engine forward. You can keep the shifter in the stock position and not modify your drivelines.

SeventyOne · 05-23-2018, 12:42 PM

Agreed - engine forward 1-7/8". It's what I did too.

PGG · 05-23-2018, 01:41 PM

Quote:

Originally Posted by SeventyOne

Agreed - engine forward 1-7/8". It's what I did too.

How is this normally done? Sorry I really dont have an idea how to do that.
Thanks PG

SeventyOne · 05-23-2018, 03:39 PM

I assume the engine and TH350 are in the truck?

Get engine hoist to support engine - unbolt engine crossmember bolts and maybe the engine mounts.

Unbolt TH350 as normal to remove. When out, or while pulling TH350, slide engine forward 2+ inches - this is more than enough room now to jack the 700r4 up and to install it to the back of engine. Now slide the engine/trans back a little bit to bolt the the Tcase.

Make sure you have everything where you want it now drill the frame for the new holes where the engine crossmember sits. Bolt it up. Tighten everything up.

Done.

PGG · 05-23-2018, 04:42 PM

Quote:

Originally Posted by SeventyOne

I assume the engine and TH350 are in the truck?

Get engine hoist to support engine - unbolt engine crossmember bolts and maybe the engine mounts.

Unbolt TH350 as normal to remove. When out, or while pulling TH350, slide engine forward 2+ inches - this is more than enough room now to jack the 700r4 up and to install it to the back of engine. Now slide the engine/trans back a little bit to bolt the the Tcase.

Make sure you have everything where you want it now drill the frame for the new holes where the engine crossmember sits. Bolt it up. Tighten everything up.

Done.

Sad to say the engine and trans are pulled already. PG

SeventyOne · 05-23-2018, 05:21 PM

Even easier.

Get the trans and engine mated and put them in the truck. Get the trans bolted to the Tcase just like normal. Before you do this get the engine crossmemeber unbolted and slid forward ~2". Now get the crossmember/engine mounts bolted up to the engine. Drill your holes. bolt her up.

**Blazerowner** · 05-24-2018, 11:57 AM

My frame on my 72 actually has holes in the forward position. I have heard of people using these when converting. Notice the second set forward of where my crossmember is bolted in the picture.

SeventyOne · 05-24-2018, 12:33 PM

My 71 has those holes too but from what I recall not ALL the holes lined up correctly.

Maybe you'll have better luck.

*YoungPup1977* · 05-24-2018, 11:04 PM

What transfer case do you have ? NP205 ? I missed what year and vehicle you have.....

Jesse B. · 05-25-2018, 03:35 PM

On my swap, I only moved the engine forward about 1" and then heated the 4wd shifter with a torch and bent it forward to fit in the original floor board hole. Worked fine for me. I did not want to move the engine the full 2" forward. I preferred as much weight shifted to the back as possible. I also used the spacer between the transmission and the NP205 rather than installing a shorter output shaft in the 700R. I chose the spacer to give the front driveshaft additional clearance without hitting the tranny pan.

PGG · 05-25-2018, 05:38 PM

Quote:

Originally Posted by YoungPup1977

What transfer case do you have ? NP205 ? I missed what year and vehicle you have.....

Sorry it is a 1972 K5 I think NP205! We did get it all bolted up now!

Thank you all for the help and input! PG

*YoungPup1977* · 05-25-2018, 05:49 PM

Wow. 2 days ago the engine and trans was out. That’s fast.

PGG · 05-26-2018, 12:13 AM

Quote:

Originally Posted by YoungPup1977

Wow. 2 days ago the engine and trans was out. That’s fast.

Still some work to do but its in and should be ready in a week I think to start breaking it in! PG

*YoungPup1977* · 05-27-2018, 08:13 PM

Quote:

Originally Posted by PGG

Still some work to do but its in and should be ready in a week I think to start breaking it in! PG

Can you provide some pics of the shifter, I would like to see how you did yours. Transfer case pic and how did you connect the 700R4 linkage ? Can you provide pics of how you did the trans linkage too, is it column shift or after market floor shifter ?

BobbyK · 06-01-2018, 03:36 PM

The stock bracket bolted to the frame can be swung forward to realign the linkages.
Just loosen the top bolt, take out the lower bolt, redrill new hole and bolt in lower bolt.
It 's not perfect but has worked for me since I did this conversion back in 1999.

Yellow outline is where the bracket is from the factory. And then after it's been relocated.

*YoungPup1977* · 06-09-2018, 08:48 AM

Quote:

Originally Posted by PGG

Still some work to do but its in and should be ready in a week I think to start breaking it in! PG

Where are the pic's ? we all love pic's .....

05-23-2018, 10:39 AM	#1
PGG Registered User Join Date: Mar 2015 Location: Fort Worth Texas Posts: 279	Swaping to a 700R trans What is required to move the shifter back for this swap it had the stock TH350 since my engine was not the original I went with a GM crate motor and swapped to a 700R for the overdrive. The 4wd shifter will need to be moved back any tips on how to do it right? Thanks PG

05-23-2018, 11:14 AM	#2
Blazerowner Senior Member Join Date: Apr 2006 Location: Yuba City, Ca Posts: 1,955	Re: Swaping to a 700R trans Move the engine forward. You can keep the shifter in the stock position and not modify your drivelines. __________________ Kirk 72 Blazer CST 4wd highlander

05-23-2018, 12:42 PM	#3
SeventyOne Registered User Join Date: Mar 2007 Location: Oakland, Ca Posts: 1,382	Re: Swaping to a 700R trans Agreed - engine forward 1-7/8". It's what I did too.

05-23-2018, 03:39 PM	#5
SeventyOne Registered User Join Date: Mar 2007 Location: Oakland, Ca Posts: 1,382	Re: Swaping to a 700R trans I assume the engine and TH350 are in the truck? Get engine hoist to support engine - unbolt engine crossmember bolts and maybe the engine mounts. Unbolt TH350 as normal to remove. When out, or while pulling TH350, slide engine forward 2+ inches - this is more than enough room now to jack the 700r4 up and to install it to the back of engine. Now slide the engine/trans back a little bit to bolt the the Tcase. Make sure you have everything where you want it now drill the frame for the new holes where the engine crossmember sits. Bolt it up. Tighten everything up. Done.

05-23-2018, 05:21 PM	#7
SeventyOne Registered User Join Date: Mar 2007 Location: Oakland, Ca Posts: 1,382	Re: Swaping to a 700R trans Even easier. Get the trans and engine mated and put them in the truck. Get the trans bolted to the Tcase just like normal. Before you do this get the engine crossmemeber unbolted and slid forward ~2". Now get the crossmember/engine mounts bolted up to the engine. Drill your holes. bolt her up.

05-24-2018, 11:57 AM	#8
Blazerowner Senior Member Join Date: Apr 2006 Location: Yuba City, Ca Posts: 1,955	Re: Swaping to a 700R trans My frame on my 72 actually has holes in the forward position. I have heard of people using these when converting. Notice the second set forward of where my crossmember is bolted in the picture. Attached Images __________________ Kirk 72 Blazer CST 4wd highlander

05-24-2018, 12:33 PM	#9
SeventyOne Registered User Join Date: Mar 2007 Location: Oakland, Ca Posts: 1,382	Re: Swaping to a 700R trans My 71 has those holes too but from what I recall not ALL the holes lined up correctly. Maybe you'll have better luck. Last edited by SeventyOne; 05-24-2018 at 01:02 PM.

05-24-2018, 11:04 PM	#10
YoungPup1977 Account Suspended Join Date: Jun 2015 Location: No longer here Posts: 1,000	Re: Swaping to a 700R trans What transfer case do you have ? NP205 ? I missed what year and vehicle you have.....

05-25-2018, 03:35 PM	#11
Jesse B. Registered User Join Date: Jan 2017 Location: Carmichael, CA Posts: 91	Re: Swaping to a 700R trans On my swap, I only moved the engine forward about 1" and then heated the 4wd shifter with a torch and bent it forward to fit in the original floor board hole. Worked fine for me. I did not want to move the engine the full 2" forward. I preferred as much weight shifted to the back as possible. I also used the spacer between the transmission and the NP205 rather than installing a shorter output shaft in the 700R. I chose the spacer to give the front driveshaft additional clearance without hitting the tranny pan.

05-25-2018, 05:49 PM	#13
YoungPup1977 Account Suspended Join Date: Jun 2015 Location: No longer here Posts: 1,000	Re: Swaping to a 700R trans Wow. 2 days ago the engine and trans was out. That’s fast.

06-01-2018, 03:36 PM	#16
BobbyK Registered User Join Date: May 2000 Location: Petrolia,Ontario,Canada but working in Port Huron,Mi. Posts: 1,772	Re: Swaping to a 700R trans The stock bracket bolted to the frame can be swung forward to realign the linkages. Just loosen the top bolt, take out the lower bolt, redrill new hole and bolt in lower bolt. It 's not perfect but has worked for me since I did this conversion back in 1999. Yellow outline is where the bracket is from the factory. And then after it's been relocated. __________________ 71 blazer,350SBC,approx.375HP,700R4,factory GM TPI.Dual electric fans,33x12.5x15 ATR on stock suspension. Petrolia,Ontario,Canada but working in Port Huron,MI. See ALL my Blazer pic's HERE



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