how to change from a 350th to a 700R? help! - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Brently · 07-31-2004, 06:48 PM

i am in need of someone to spell out how to change over a 350 turbo to 700R - i have a 700R out of a 86 Astro van - can someone tell me if this will work - is the length the same? is the spline of the yoke the same? what do i need to do to lock up overdrive? what all equipment will i need to do so? i am putting this in my 71 swb chevy truck - it has a 350 motor in it with a 3:42 posi unit behind it - trying to get better highway gearing and better gas mileage - any help would be appreciated - thanks, Brent

krue · 07-31-2004, 07:03 PM

To swap a 700r4 in your going to have to shorten your driveshaft (it's the same length as the th350 w/9" tailshaft, yours should be the 6" tailshaft version.)

**john** · 07-31-2004, 08:11 PM

this covers most of your ? s
http://www.700r4.com/

chickenwing · 08-01-2004, 01:45 AM

http:/www.highperformancecars.com/crosley/4l80e.html

I'm new at this hyperlinking thing. This site really helped me out. I did buy some tv cable brackets from bowtie overdrives. Lock-up kit I bought from tci automotive. If the link does not work I will try it again.

chickenwing · 08-01-2004, 01:48 AM

http://www.highperformancecars.com/crosley/4l80e.htm

Brently · 08-02-2004, 05:17 PM

what kind of money am i talking to change over to a 700R? thanks for the websites - Brent

cdowns · 08-02-2004, 08:22 PM

2004R trannys are better trannys and easier to swap

chickenwing · 08-03-2004, 12:27 AM

Can't say wich one is better. I have had mine in for 3 months with no problems. I only have a stock motor though and have not done any heavy towing yet. I spent around a grand. I paid $690 for a 700r4 including freight and core from Ganterbine transmission on ebay. I paid another $125 to have my 2 piece driveshaft shortened, balanced and a new carrier bearing installed. I got a lock-up wiring kit from TCI automotive, forget how much. I paid around $150 for a tranny pressure gauge (non-mountable testing only) tranny temp gauge (instrument) and a tv cable bracket from bow-tie overdrives. I am sure I coulda went the junk-yard route for the tranny and the tv cable/bracket, I could have wired the lock-up myself using info found on the above website. But I did not. I wanted a warranted tranny and easy installation.

07-31-2004, 06:48 PM	#1
Brently Registered User Join Date: Feb 2002 Location: Chattanooga Posts: 151	how to change from a 350th to a 700R? help! i am in need of someone to spell out how to change over a 350 turbo to 700R - i have a 700R out of a 86 Astro van - can someone tell me if this will work - is the length the same? is the spline of the yoke the same? what do i need to do to lock up overdrive? what all equipment will i need to do so? i am putting this in my 71 swb chevy truck - it has a 350 motor in it with a 3:42 posi unit behind it - trying to get better highway gearing and better gas mileage - any help would be appreciated - thanks, Brent

07-31-2004, 07:03 PM	#2
krue Designated A-hole! Join Date: Mar 2003 Location: South Mississippi Posts: 36,450	To swap a 700r4 in your going to have to shorten your driveshaft (it's the same length as the th350 w/9" tailshaft, yours should be the 6" tailshaft version.) __________________ "If it ain't broke, fix it 'til it is!" Being stupid ain't illegal. We're Still Debt Free Except for the House!!! www.daveramsey.com 70 GMC SWB Stepside project "Green Booger" soon to be 6.0l/4l80e 93 S-10 "Poppaw's Truck"

07-31-2004, 08:11 PM	#3
john member #16 Join Date: Dec 1999 Location: Yuba City Ca. Posts: 3,618	this covers most of your ? s http://www.700r4.com/ __________________ john http://67-72chevytrucks.com/vboard/showgroups.php board vendors http://www.flickr.com/photos/1745471...7602865984234/

08-01-2004, 01:45 AM	#4
chickenwing Lovin' Life in Miss.! Join Date: Mar 2004 Location: Puckett, Mississippi Posts: 1,937	http:/www.highperformancecars.com/crosley/4l80e.html I'm new at this hyperlinking thing. This site really helped me out. I did buy some tv cable brackets from bowtie overdrives. Lock-up kit I bought from tci automotive. If the link does not work I will try it again. __________________ The truck... you hear that? No really, you did hear that?!!!

08-01-2004, 01:48 AM	#5
chickenwing Lovin' Life in Miss.! Join Date: Mar 2004 Location: Puckett, Mississippi Posts: 1,937	http://www.highperformancecars.com/crosley/4l80e.htm __________________ The truck... you hear that? No really, you did hear that?!!!

08-02-2004, 05:17 PM	#6
Brently Registered User Join Date: Feb 2002 Location: Chattanooga Posts: 151	rear end change what kind of money am i talking to change over to a 700R? thanks for the websites - Brent

08-02-2004, 08:22 PM	#7
cdowns Senior Member Join Date: Jan 2003 Location: daytonabeach Posts: 22,956	2004R trannys are better trannys and easier to swap __________________ 71c-10 350/2004r/4:11 lowered3/4 longbed/dead by hurricane MEANING OF DEATH::::: SOMEBODY ELSE GETS YOUR STUFF DONT BELIEVE EVERYTHING YOU THINK TAKE MY ADVISE;I DON'T USE IT ANYWAY

08-03-2004, 12:27 AM	#8
chickenwing Lovin' Life in Miss.! Join Date: Mar 2004 Location: Puckett, Mississippi Posts: 1,937	Can't say wich one is better. I have had mine in for 3 months with no problems. I only have a stock motor though and have not done any heavy towing yet. I spent around a grand. I paid $690 for a 700r4 including freight and core from Ganterbine transmission on ebay. I paid another $125 to have my 2 piece driveshaft shortened, balanced and a new carrier bearing installed. I got a lock-up wiring kit from TCI automotive, forget how much. I paid around $150 for a tranny pressure gauge (non-mountable testing only) tranny temp gauge (instrument) and a tv cable bracket from bow-tie overdrives. I am sure I coulda went the junk-yard route for the tranny and the tv cable/bracket, I could have wired the lock-up myself using info found on the above website. But I did not. I wanted a warranted tranny and easy installation. __________________ The truck... you hear that? No really, you did hear that?!!!



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