700R install Q's - The 1947 - Present Chevrolet & GMC Truck Message Board Network

72MARIO · 01-16-2004, 10:33 PM

I was just wondering do I need to drill any holes in the frame so that the tranny crossmember lines up ? I am going to use 6 Cly motor stands. But just for memory sake if i was to leave it in the stock 8 Cyl mounts would there be a need to drill new holes /

Thanks

jay6891 · 01-16-2004, 10:59 PM

Mine is mounted in the v-8 position. I do not remember drilling any holes. That was 5 yrs ago though. Maybe I'm not a stickler but I do not see anything wrong with drilling 4-3/8" holes for better gas milage.

72MARIO · 01-16-2004, 11:22 PM

Hey easy there buddy, (Joke)

I am just trying to figure out if it's oky to put my cab on the frame before the motor and tranny are in place. I would rather put the cab on later if I have to drill the holes from the under side of the truck.

Sorry I should have given the whole story.

Tx Firefighter · 01-17-2004, 12:18 AM

My truck, with the engine in the small block holes, I had to drill another set of holes for the 700 swap. I actually didn't drill the upper 4 holes, just the lower 4.

on edit: the reason I only drilled the lower 4 is because it was near impossible to do the upper ones with the truck fully assembled.

Low69CST · 01-17-2004, 12:21 AM

I drilled holes in the frame because i had a problem with the tranny cross member. The lip on it blocked the rear pan bolts. So i redrilled the holes in the crossmember to a more forward location, giving me room to get to the pan bolts. And that caused me to have to drill all new holes in the frame. Do you have a low or high hump cab? When I had the low hump, the spot weld lip barely touched the tranny, problem is solved with the big hump though.

jay6891 · 01-17-2004, 12:18 PM

Sorry if I came off like a smart@ss. Like Txfirefighter, I didn't drill for the top holes.

72MARIO · 01-17-2004, 01:37 PM

No problem Buddy.

I have a low hump cab. I guess it's a good thing that I was thinking about the tranny crossmember bolt's before the truck went together.

What should I use for a tranny mount just the same one that I would use for a 350 tranny ?

Thanks for your help guys.

Tx Firefighter · 01-17-2004, 01:40 PM

same mount as the old tranny used.

breeh · 01-17-2004, 01:49 PM

I had to drill new holes. If you use a long bit you can drill up through the bottom holes and make the top holes too!

Project1970 · 01-18-2004, 01:22 PM

The crossmember I have in mine doesn't even touch the top of the frame, if that's what you guys are talking about as far as 'top holes'...four holes in the bottom of the frame from under the truck is cake.

Also...with my 350 in the original position, and a low-hump cab, I haven't had any clearance problems between the tranny and cab...but it's CLOSE!

bad69 · 01-18-2004, 11:35 PM

I used a camaro tail shaft and the v-8 mounts and the rear holes in the frame lined right up.

01-16-2004, 10:33 PM	#1
72MARIO Registered User Join Date: Nov 2000 Location: Huntsville Ontario Canada Posts: 4,051	700R install Q's I was just wondering do I need to drill any holes in the frame so that the tranny crossmember lines up ? I am going to use 6 Cly motor stands. But just for memory sake if i was to leave it in the stock 8 Cyl mounts would there be a need to drill new holes / Thanks __________________ 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

01-16-2004, 10:59 PM	#2
jay6891 Car Knocker Join Date: May 2001 Location: jefferson,arkansas Posts: 664	Mine is mounted in the v-8 position. I do not remember drilling any holes. That was 5 yrs ago though. Maybe I'm not a stickler but I do not see anything wrong with drilling 4-3/8" holes for better gas milage. __________________ 68 c-10,91 sportside bed,350 .030 over,4 bolt,10-1 comp,2.05 intake/1.94 exhaust,1.6 Harland Sharp roller rockers,edelbrock rpm cam and intake w/750 carb, 700r4, 3.73 gears,Jacabbs Electronic Igntion w/Accel HEI distributer and super coil. ZR-1 roll pan, filled tailights. Blazer tank. Hidden hitch. 2 1/2" Flowmaster 40's. Parts bought but not installed>> ford 9" posi with disc. CCP front and rear lowering kit 4/5. Cab corners,foor boards,rockers, cab braces, Phatom grill, Painless wiring kit.

01-16-2004, 11:22 PM	#3
72MARIO Registered User Join Date: Nov 2000 Location: Huntsville Ontario Canada Posts: 4,051	Hey easy there buddy, (Joke) I am just trying to figure out if it's oky to put my cab on the frame before the motor and tranny are in place. I would rather put the cab on later if I have to drill the holes from the under side of the truck. Sorry I should have given the whole story. __________________ 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

01-17-2004, 12:18 AM	#4
Tx Firefighter Watch out for your cornhole ! Join Date: Jun 2003 Location: Azle, Texas Posts: 14,162	My truck, with the engine in the small block holes, I had to drill another set of holes for the 700 swap. I actually didn't drill the upper 4 holes, just the lower 4. on edit: the reason I only drilled the lower 4 is because it was near impossible to do the upper ones with the truck fully assembled. __________________ I'm on the Instagram- @Gearhead_Kevin

01-17-2004, 12:21 AM	#5
Low69CST Registered User Join Date: May 2000 Location: Frankfort, Kentucky, USA Posts: 2,163	I drilled holes in the frame because i had a problem with the tranny cross member. The lip on it blocked the rear pan bolts. So i redrilled the holes in the crossmember to a more forward location, giving me room to get to the pan bolts. And that caused me to have to drill all new holes in the frame. Do you have a low or high hump cab? When I had the low hump, the spot weld lip barely touched the tranny, problem is solved with the big hump though. __________________ '69 CST Short fleetside Lowered, 400 small block, 700R4, 4 wheel disc brakes, front sway bar & rear camaro sway bar (in progress) '87 V10 4x4 Short Fleetside Quad Suspension and Dual Tanks

01-17-2004, 12:18 PM	#6
jay6891 Car Knocker Join Date: May 2001 Location: jefferson,arkansas Posts: 664	Sorry if I came off like a smart@ss. Like Txfirefighter, I didn't drill for the top holes. __________________ 68 c-10,91 sportside bed,350 .030 over,4 bolt,10-1 comp,2.05 intake/1.94 exhaust,1.6 Harland Sharp roller rockers,edelbrock rpm cam and intake w/750 carb, 700r4, 3.73 gears,Jacabbs Electronic Igntion w/Accel HEI distributer and super coil. ZR-1 roll pan, filled tailights. Blazer tank. Hidden hitch. 2 1/2" Flowmaster 40's. Parts bought but not installed>> ford 9" posi with disc. CCP front and rear lowering kit 4/5. Cab corners,foor boards,rockers, cab braces, Phatom grill, Painless wiring kit.

01-17-2004, 01:37 PM	#7
72MARIO Registered User Join Date: Nov 2000 Location: Huntsville Ontario Canada Posts: 4,051	No problem Buddy. I have a low hump cab. I guess it's a good thing that I was thinking about the tranny crossmember bolt's before the truck went together. What should I use for a tranny mount just the same one that I would use for a 350 tranny ? Thanks for your help guys. __________________ 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

01-17-2004, 01:40 PM	#8
Tx Firefighter Watch out for your cornhole ! Join Date: Jun 2003 Location: Azle, Texas Posts: 14,162	same mount as the old tranny used. __________________ I'm on the Instagram- @Gearhead_Kevin

01-17-2004, 01:49 PM	#9
breeh Recovering 67-72 Addict Join Date: Oct 2000 Location: North Bend, WA Posts: 1,788	I had to drill new holes. If you use a long bit you can drill up through the bottom holes and make the top holes too! __________________ 68 Short Fleet 4x4; 427; BTO Level 3 700R4; NP205; Dana 60 front and rear; 4" lift with 35's; Disc brakes; AGR variable ratio steering; factory bucket seats; factory tach and tilt. "Friends call me cruzer cuz I like fast cars and fast women"

01-18-2004, 01:22 PM	#10
Project1970 14.1 @ 96MPH Join Date: Jul 2001 Location: Mesa, AZ Posts: 2,811	The crossmember I have in mine doesn't even touch the top of the frame, if that's what you guys are talking about as far as 'top holes'...four holes in the bottom of the frame from under the truck is cake. Also...with my 350 in the original position, and a low-hump cab, I haven't had any clearance problems between the tranny and cab...but it's CLOSE! __________________ Project1970 - LS1 Swap Complete!

01-18-2004, 11:35 PM	#11
bad69 Struggling Artist Join Date: Dec 2003 Location: Battle Ground WA. Posts: 122	I used a camaro tail shaft and the v-8 mounts and the rear holes in the frame lined right up. __________________ 69 1/2 ton lwb lowrider 90 C-1500 2wd 08 2500 HD 4WD 94 Grand Cherokee 49 Cadillac sedan



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