tranny question - The 1947 - Present Chevrolet & GMC Truck Message Board Network

jeremy zander · 11-10-2011, 01:32 AM

Hey gurus..!!.I have a 73 3/4 4x..350/350/np205...My question is would a 86 1/2 700r4 4x4 tranny work with my application??..I am looking for overdrive..there is one on craiglist ,with the tourqe converter $200..says works perfect..thanks,,Jeremy..

SS Tim · 11-10-2011, 02:18 AM

If you can't drive the trans. consider it and the T/C cores!

fwells67 · 11-10-2011, 02:21 AM

Quote:

Originally Posted by SS Tim

If you can't drive the trans. consider it and the T/C cores!

exactly i have been burned that way before i would never buy a trans you could not test yourself way to many things that could go wrong in a trans.

*stich626* · 11-10-2011, 03:22 AM

talk him down to 125-150 and if you are installing it yourself it only be your labor and time if it don't work, you have a core.. no idea if it'll bolt to your transfercase tho..

jeremy zander · 11-10-2011, 09:41 AM

I agree that you cannot trust anything you cannot test first..I am willing to take a chance,like I have many times on this site for parts...I just want to no if it will fit or do I need to look for another year or style for my 72 3/4 4x4....

16N67 · 11-10-2011, 11:32 AM

It is not a bolt in. The 700 is 3" longer, The tail shaft sticks out of the case 3" on the 700 and only 1" on the 350, so an adapter or different tail shaft will be needed. Different length drive shafts, longer front shorter rear. Transfer case shifter hole in floor moves toward the seat 3+ inches, longer speedometer cable, TV cable bracket at carb.
I also agree if its not in something you can test drive it is a core tranny

mrein3 · 11-10-2011, 01:59 PM

To use a 700r4 in a 67-72 4x4 where a th350 currently exists you need the following part:
http://www.advanceadapters.com/products/pn-50-6900/
Like others have said take your core 700r4 to a reputible shop and have them rebuild it with the $165 output shaft installed from Advance Adapters.

Then when you get your rebuilt tranny back remove the engine, remove the th350 out the front, and leave the NP205 and adapter bolted in place. The 700r4 is about 2" longer than the th350 so you'll need to move your engine crossmember ahead that much. Remember in a stock 4x4 the engine sits farther back. I HAVE NOT DONE THIS MOD but others on this board have. The other option is to move the t-case back but then you need to shorten the rear driveshaft and lengthen the front one.

WHEN I do this mod I'm moving my engine forward.

Check for that AA part at Summit Racing and other suppliers. The last time I checked it was cheaper there than from the manufacturer.

As far as I know there is no direct bolt in overdrive replacement for a stock 4x4.

Also when doing this mod seriously consider a new drive sleeve if yours is grooved and new oil seals in the adapter. This is heavy stuff and you don't want to go in there twice.

cleszkie · 11-10-2011, 03:22 PM

Also check to see if the 700R is a "K" case model. I understand that these are more desireable due to increased case strength. Others with more knowledge of the 700R will correct me if I am wrong here.

jeremy zander · 11-11-2011, 05:39 AM

ok wow,great info,not a drop in......exactly what I needed to no..thank you!!!

11-10-2011, 01:32 AM	#1
jeremy zander Registered User Join Date: Oct 2005 Location: shakopee minnesota Posts: 515	tranny question Hey gurus..!!.I have a 73 3/4 4x..350/350/np205...My question is would a 86 1/2 700r4 4x4 tranny work with my application??..I am looking for overdrive..there is one on craiglist ,with the tourqe converter $200..says works perfect..thanks,,Jeremy.. __________________ WTB 1972 CHEVY 3/4 4X4 1971 chevy c30 4x4 NAPCO (project) 1972 chevy 3/4 4x4 350/350 4spd, tach, tow hooks,radio delete,heat delete,hubcaps,lockers 1972 chevy 3/4 4x4 383/350 dads original farm truck tilt,tach,tow hooks,hubcaps,radio delete,heat delete 2006 chevy LBZ crew cab duramax,4 inch,beadlocks 2015 chevy tahoe Z71 my fifth one,love em 2016 chevy 2500HD Z71 LTZ duramax midnite 2018 chevy suburban Z71 midnite

11-10-2011, 02:18 AM	#2
SS Tim Registered User Join Date: Aug 2010 Location: Edwards, CA Posts: 7,503	Re: tranny question If you can't drive the trans. consider it and the T/C cores! __________________ Thanks, Tim * VIN/Model Decoders * Power Team Charts (engine/transmission/gear ratio) * Post Your Pickup SPID Blazer SPID Suburban/Panel SPID * RTFM ... Read The Factory Manuals... download 'em here Highlanders Do you have a 1972 Plaid Pickup? Plaid Blazer ** Plaid Suburban

11-10-2011, 03:22 AM	#4
stich626 Account Suspended Join Date: Sep 2010 Location: hingham ma Posts: 1,721	Re: tranny question talk him down to 125-150 and if you are installing it yourself it only be your labor and time if it don't work, you have a core.. no idea if it'll bolt to your transfercase tho..

11-10-2011, 09:41 AM	#5
jeremy zander Registered User Join Date: Oct 2005 Location: shakopee minnesota Posts: 515	Re: tranny question I agree that you cannot trust anything you cannot test first..I am willing to take a chance,like I have many times on this site for parts...I just want to no if it will fit or do I need to look for another year or style for my 72 3/4 4x4.... __________________ WTB 1972 CHEVY 3/4 4X4 1971 chevy c30 4x4 NAPCO (project) 1972 chevy 3/4 4x4 350/350 4spd, tach, tow hooks,radio delete,heat delete,hubcaps,lockers 1972 chevy 3/4 4x4 383/350 dads original farm truck tilt,tach,tow hooks,hubcaps,radio delete,heat delete 2006 chevy LBZ crew cab duramax,4 inch,beadlocks 2015 chevy tahoe Z71 my fifth one,love em 2016 chevy 2500HD Z71 LTZ duramax midnite 2018 chevy suburban Z71 midnite

11-10-2011, 11:32 AM	#6
16N67 Registered User Join Date: Dec 2009 Location: Franklin,PA Posts: 29	Re: tranny question It is not a bolt in. The 700 is 3" longer, The tail shaft sticks out of the case 3" on the 700 and only 1" on the 350, so an adapter or different tail shaft will be needed. Different length drive shafts, longer front shorter rear. Transfer case shifter hole in floor moves toward the seat 3+ inches, longer speedometer cable, TV cable bracket at carb. I also agree if its not in something you can test drive it is a core tranny

11-10-2011, 01:59 PM	#7
mrein3 Registered User Join Date: Feb 2000 Location: Center City, MN, USA Posts: 3,253	Re: tranny question To use a 700r4 in a 67-72 4x4 where a th350 currently exists you need the following part: http://www.advanceadapters.com/products/pn-50-6900/ Like others have said take your core 700r4 to a reputible shop and have them rebuild it with the $165 output shaft installed from Advance Adapters. Then when you get your rebuilt tranny back remove the engine, remove the th350 out the front, and leave the NP205 and adapter bolted in place. The 700r4 is about 2" longer than the th350 so you'll need to move your engine crossmember ahead that much. Remember in a stock 4x4 the engine sits farther back. I HAVE NOT DONE THIS MOD but others on this board have. The other option is to move the t-case back but then you need to shorten the rear driveshaft and lengthen the front one. WHEN I do this mod I'm moving my engine forward. Check for that AA part at Summit Racing and other suppliers. The last time I checked it was cheaper there than from the manufacturer. As far as I know there is no direct bolt in overdrive replacement for a stock 4x4. Also when doing this mod seriously consider a new drive sleeve if yours is grooved and new oil seals in the adapter. This is heavy stuff and you don't want to go in there twice. __________________ '70 cab, '71 chassis, 383, TH350, NP205. '71 Malibu convertible '72 Malibu hard top Center City, MN

11-10-2011, 03:22 PM	#8
cleszkie Registered User Join Date: Feb 2003 Location: Santa Ana, CA Posts: 2,191	Re: tranny question Also check to see if the 700R is a "K" case model. I understand that these are more desireable due to increased case strength. Others with more knowledge of the 700R will correct me if I am wrong here.

11-11-2011, 05:39 AM	#9
jeremy zander Registered User Join Date: Oct 2005 Location: shakopee minnesota Posts: 515	Re: tranny question ok wow,great info,not a drop in......exactly what I needed to no..thank you!!! __________________ WTB 1972 CHEVY 3/4 4X4 1971 chevy c30 4x4 NAPCO (project) 1972 chevy 3/4 4x4 350/350 4spd, tach, tow hooks,radio delete,heat delete,hubcaps,lockers 1972 chevy 3/4 4x4 383/350 dads original farm truck tilt,tach,tow hooks,hubcaps,radio delete,heat delete 2006 chevy LBZ crew cab duramax,4 inch,beadlocks 2015 chevy tahoe Z71 my fifth one,love em 2016 chevy 2500HD Z71 LTZ duramax midnite 2018 chevy suburban Z71 midnite



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