700R4 in a K10 questions: - The 1947 - Present Chevrolet & GMC Truck Message Board Network

suburban99 · 01-31-2018, 04:54 PM

Picked up a 700R4 from a 1991 4x4 at the U-pull auto wrecker. All trannies were on sale for $69.00...Currently my K10 has a 6.0 LQ4 with the TH350 and 205 Transfer case. I know I can swap the 700R4 output shaft and the total dimensions of the combo will be about 1.5" longer. Or buy the adapter from Advance Adapters and keep stock output but it grows to 3" longer. A guy has a 700R4 to 205 adapter for sale on Craigs here and I am wondering what the overall length would be with this adapter..

Bigdav160 · 01-31-2018, 05:55 PM

Quote:

A guy has a 700R4 to 205 adapter for sale on Craigs here and I am wondering what the overall length would be with this adapter.

I can't help with your question. Is the adapter for sale different than the two you mentioned? A '91 4L60 will bolt directly to your NP205 with the short AA output shaft.

On my truck I elected to move the engine forward leaving the transfer case and driveshafts in place. I had to move the mounts forward 1.5", extend the exhaust pipes, shorten the coolant hoses, move the shift linkage forward and my factory fan shroud no longer fit. The front driveshaft is pretty close to the transmission pan but does not hit with a 2" lift.

I do not know what changes need to be made with an LS in the engine bay.

What engine controller are you using? Many choose the 4L60e so their factory controller does the transmission chores as well as runs the engine.

suburban99 · 01-31-2018, 06:06 PM

Quote:

Originally Posted by Bigdav160

I can't help with your question. Is the adapter for sale different than the two you mentioned? A '91 4L60 will bolt directly to your NP205 with the short AA output shaft.

On my truck I elected to move the engine forward leaving the transfer case and driveshafts in place. I had to move the mounts forward 1.5", extend the exhaust pipes, shorten the coolant hoses, move the shift linkage forward and my factory fan shroud no longer fit. The front driveshaft is pretty close to the transmission pan but does not hit with a 2" lift.

I do not know what changes need to be made with an LS in the engine bay.

What engine controller are you using? Many choose the 4L60e so their factory controller does the transmission chores as well as runs the engine.

Yes the adapter looks like the TH 350 one that's on my K10 only thicker...? maybe?
I am using the stock PCM as an ECM...stock fuel injection. (Really it's a relatively easy swap.) The donor had a 4L80E but the case was trashed and the 4L80E is too long for my application. I plan on moving the engine forward as required as I have quite a bit of room as engine is in the stock 350 location, and I don't want to move the 205 or driveshafts.

MARKDTN · 02-01-2018, 01:12 PM

I thought that a 6.0 PCM will not control a 4L60E and would only control a 4L80E?

**Jcfcamaro** · 02-01-2018, 02:28 PM

Does the 700r4 tailshaft have enough splines going back towards the housing? If so you could just cut the tailshaft off to match the length of the turbo 350 splines. Then bolt it together. Seen this done on a 4l80.They slid a bigger piece of pipe over the shaft to mark it even all the way around it then used a cut off wheel. Of course they put rags around it to keep metal from getting inside the tailhousing .

suburban99 · 02-01-2018, 02:59 PM

Quote:

Originally Posted by Jcfcamaro

Does the 700r4 tailshaft have enough splines going back towards the housing? If so you could just cut the tailshaft off to match the length of the turbo 350 splines. Then bolt it together. Seen this done on a 4l80.They slid a bigger piece of pipe over the shaft to mark it even all the way around it then used a cut off wheel. Of course they put rags around it to keep metal from getting inside the tailhousing .

I thought about this...just stuff some rags soaked in cold water around shaft to keep shaft from getting too hot..

**Jcfcamaro** · 02-01-2018, 03:04 PM

I'm following this because I plan on doing the same swap in my 72 k10 with a 396 and 700r4 trans. Motor needs to come forward for firewall clearance and with the 700r4 needing to come forward around 1 1/2 inches it will put everything where it needs to be.

**A1971Blazer** · 02-01-2018, 04:34 PM

the 700R4 uses a TV cable to function...is your LQ4 DBC?

suburban99 · 02-01-2018, 04:51 PM

Quote:

Originally Posted by A1971Blazer

the 700R4 uses a TV cable to function...is your LQ4 DBC?

Yes DBC...out of a 2003 2500HD. Fabricated a bracket for the TH350 downshift cable so TV shouldn't be too hard.

01-31-2018, 04:54 PM	#1
suburban99 Registered User Join Date: May 2014 Location: Mission BC Posts: 452	700R4 in a K10 questions: Picked up a 700R4 from a 1991 4x4 at the U-pull auto wrecker. All trannies were on sale for $69.00...Currently my K10 has a 6.0 LQ4 with the TH350 and 205 Transfer case. I know I can swap the 700R4 output shaft and the total dimensions of the combo will be about 1.5" longer. Or buy the adapter from Advance Adapters and keep stock output but it grows to 3" longer. A guy has a 700R4 to 205 adapter for sale on Craigs here and I am wondering what the overall length would be with this adapter.. __________________ 1962 C10 Longbox LS 5.3 4L60E----Sold$$ 2014 Ram 4x4 3500 Laramie Diesel..Momma's truck 2015 Ram 4x4 1500 1997 Boxster. 1972 K10 Custom Deluxe LS 6.0 1950 GMC 3100 S10 & LS swapped

02-01-2018, 01:12 PM	#4
MARKDTN Registered User Join Date: Jan 2011 Location: Chattanooga, TN Posts: 2,159	Re: 700R4 in a K10 questions: I thought that a 6.0 PCM will not control a 4L60E and would only control a 4L80E? __________________ '83 K20-TPI '73 C10 '79 C10-ex-diesel(SOLD) '07 Tahoe(Son driving) '14 Suburban-DD '71 C10-current project

02-01-2018, 02:28 PM	#5
Jcfcamaro Senior Member Join Date: Jul 2015 Location: Fairfax, Missouri Posts: 1,049	Re: 700R4 in a K10 questions: Does the 700r4 tailshaft have enough splines going back towards the housing? If so you could just cut the tailshaft off to match the length of the turbo 350 splines. Then bolt it together. Seen this done on a 4l80.They slid a bigger piece of pipe over the shaft to mark it even all the way around it then used a cut off wheel. Of course they put rags around it to keep metal from getting inside the tailhousing . Last edited by Jcfcamaro; 02-01-2018 at 02:32 PM. Reason: Add info

02-01-2018, 03:04 PM	#7
Jcfcamaro Senior Member Join Date: Jul 2015 Location: Fairfax, Missouri Posts: 1,049	Re: 700R4 in a K10 questions: I'm following this because I plan on doing the same swap in my 72 k10 with a 396 and 700r4 trans. Motor needs to come forward for firewall clearance and with the 700r4 needing to come forward around 1 1/2 inches it will put everything where it needs to be.

02-01-2018, 04:34 PM	#8
A1971Blazer Senior Member Join Date: Nov 2013 Location: East Tennessee Posts: 2,187	Re: 700R4 in a K10 questions: the 700R4 uses a TV cable to function...is your LQ4 DBC? __________________ 1967 C10 Step side 1968 C10 Step side 1970 Chevrolet K/5 Blazer 1972 Chevrolet K/5 Blazer .............



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