R4 700 Swap from a three in the tree - The 1947 - Present Chevrolet & GMC Truck Message Board Network

brownk · 11-17-2005, 05:15 PM

Hey Guys and Gals,

Any pics or instructions on tranny crossmembers used in this type of conversion?

I did some searching but no luck... any thread references would be appreciated as well....

Kurtis

**Smitty** · 11-17-2005, 08:11 PM

I used the stock auto crossmember w/correct mount for the transmission, removed manual mount located the replacement under the 700. Marked the frame for the new holes. Make sure the crossmember is square to the frame rails before you mark and drill holes. I also trimmed off the bottom forward lip on the crossmember to allow easier access to the pan for when the filter needs to be replaced.

shifty · 11-18-2005, 12:08 AM

You need to ditch your 3spd tranny xmember and install an auto xmember.

You couldn't find anything with the search? I searched for tranny crossmember and pulled up these helpful threads:

http://67-72chevytrucks.com/vboard/s...ghlight=tranny

http://67-72chevytrucks.com/vboard/s...ghlight=tranny

http://67-72chevytrucks.com/vboard/s...ghlight=tranny

Sonny · 11-18-2005, 12:29 AM

I am not sure if it is different, but use a TH400 X-member. The speedo cable will barely reach. You will have to get the driveshaft shortened and scrounge foe a U-joint to match the 700's yoke and the truck's driveshaft (1-piece). I will see if I can find the part numbers for you. don't forget about the TV cable brackets, dipstick, lockup circuit, and flywheel cover too. I will try to post some pics before we head out to Moultrie this weekend.

Sonny

roj2323 · 11-18-2005, 12:36 AM

look in the FAQ section of the site. there are atleast 3 articals on this.

72MARIO · 11-18-2005, 12:37 PM

You will need a coloum from a auto truck/ custom one froma van. As for the shifter linkage your best to buy the "lokar" universal kit from summit racing. A few of us here are using it and it works great. The indicator that shows you correct gears is avaible for truck and van tilt coloums.

brownk · 11-18-2005, 04:43 PM

Awesome thx guys...

Alot of good suggestions...

I have the xmember from the 87 Chev that I am going to try and fabricate to fit. I will post some pics after I am done if it works.

I was under the impression that my original driveshaft would match up to the 27 Spline yoke for the tranny is that true?

Kurtis
My yoke seems to fit but I better make sure it matchs

11-17-2005, 05:15 PM	#1
brownk Registered User Join Date: Nov 2005 Location: Canada Posts: 20	R4 700 Swap from a three in the tree Hey Guys and Gals, Any pics or instructions on tranny crossmembers used in this type of conversion? I did some searching but no luck... any thread references would be appreciated as well.... Kurtis __________________ 72 Chev Custom Fleetside 2wd, 350 mild performance rebuilt crete .20 over, flat top KB pistons, stock crank, 74cc heads, Edelbrock cam, HEI, 1987 rebuilt R4 700, 20" Eagle rims with cooper 275 45 20's, and a whole lot of body work left to do. My Grandpa bought the truck new and it has worked hard for 33 years. It will now be starting its new life as a street machine and show truck.

11-17-2005, 08:11 PM	#2
Smitty Senior Member Join Date: Dec 1999 Location: Spring Valley, Ca. Posts: 1,137	Re: R4 700 Swap from a three in the tree I used the stock auto crossmember w/correct mount for the transmission, removed manual mount located the replacement under the 700. Marked the frame for the new holes. Make sure the crossmember is square to the frame rails before you mark and drill holes. I also trimmed off the bottom forward lip on the crossmember to allow easier access to the pan for when the filter needs to be replaced. __________________ Smitty '71 Short Fleetside Spring Valley, Ca.

11-18-2005, 12:08 AM	#3
shifty Questionable Join Date: Mar 2005 Location: Atlanta Posts: 13,373	Re: R4 700 Swap from a three in the tree You need to ditch your 3spd tranny xmember and install an auto xmember. You couldn't find anything with the search? I searched for tranny crossmember and pulled up these helpful threads: http://67-72chevytrucks.com/vboard/s...ghlight=tranny http://67-72chevytrucks.com/vboard/s...ghlight=tranny http://67-72chevytrucks.com/vboard/s...ghlight=tranny __________________ If I've got anything up for grabs, it'll be here: 7-hole gauge cluster for a 67-72 p/u FREE (link) I can't check the forum daily. If I don't reply to you within 24 hours, drop me a PM! I'm (hopefully) still alive and will reply faster to a PM.

11-18-2005, 12:29 AM	#4
Sonny Active Member Join Date: Jan 2004 Location: Centerville, GA Posts: 240	Re: R4 700 Swap from a three in the tree I am not sure if it is different, but use a TH400 X-member. The speedo cable will barely reach. You will have to get the driveshaft shortened and scrounge foe a U-joint to match the 700's yoke and the truck's driveshaft (1-piece). I will see if I can find the part numbers for you. don't forget about the TV cable brackets, dipstick, lockup circuit, and flywheel cover too. I will try to post some pics before we head out to Moultrie this weekend. Sonny

11-18-2005, 12:36 AM	#5
roj2323 Senior Member Join Date: Mar 2004 Location: Somewhere Posts: 985	Re: R4 700 Swap from a three in the tree look in the FAQ section of the site. there are atleast 3 articals on this.

11-18-2005, 12:37 PM	#6
72MARIO Registered User Join Date: Nov 2000 Location: Huntsville Ontario Canada Posts: 4,051	Re: R4 700 Swap from a three in the tree You will need a coloum from a auto truck/ custom one froma van. As for the shifter linkage your best to buy the "lokar" universal kit from summit racing. A few of us here are using it and it works great. The indicator that shows you correct gears is avaible for truck and van tilt coloums. __________________ 1968 Suburban numbers matching all original truck now equipped with 6.0/4L80 on Accuair http://67-72chevytrucks.com/vboard/s...d.php?t=625017 1967 C/20 6.0/4L80 Roofing Truck 1990 V2500 Suburban "Plow Truck" 2005 TAHOE DD

11-18-2005, 04:43 PM	#7
brownk Registered User Join Date: Nov 2005 Location: Canada Posts: 20	Re: R4 700 Swap from a three in the tree Awesome thx guys... Alot of good suggestions... I have the xmember from the 87 Chev that I am going to try and fabricate to fit. I will post some pics after I am done if it works. I was under the impression that my original driveshaft would match up to the 27 Spline yoke for the tranny is that true? Kurtis My yoke seems to fit but I better make sure it matchs __________________ 72 Chev Custom Fleetside 2wd, 350 mild performance rebuilt crete .20 over, flat top KB pistons, stock crank, 74cc heads, Edelbrock cam, HEI, 1987 rebuilt R4 700, 20" Eagle rims with cooper 275 45 20's, and a whole lot of body work left to do. My Grandpa bought the truck new and it has worked hard for 33 years. It will now be starting its new life as a street machine and show truck.

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