700-R4 tail housing trouble - The 1947 - Present Chevrolet & GMC Truck Message Board Network

bigblock69 · 02-22-2007, 06:26 PM

I posted yesterday and I got some of my questions answered; however, I have some left unanswered. I am putting a 454 in my 68 C-10. I am using a 700-R4 and an Early Classic transmission cross member. Problem is this. The tail housing is hitting on the cross member. No problems right, just use a spacer. Well I contacted Early Classic and asked if this problem has ever occurred before and there answer is “never heard of it happening before” why are hundreds of Early Classic customers having an outcome other than mine? I am using the correct 67-71 big block engine mount towers and the correct big block engine mounts. The engine and transmission were only sitting/not bolted down when I noticed the tail housing hitting. Could this have something to do with it? I have since pulled both eng and trans out to collect my thought on this. Any help would be greatly appreciated.

67ChevyRedneck · 02-22-2007, 06:30 PM

I'm not sure if I understand your question... is it hitting the floor of the cab?

All big block trucks came with a "high hump" floor pan. You can tell if your truck has one by looking at the hump over the transmission. If it is bolted to the floor, you have the correct floor hump. If your floor is one single piece then it's a low hump floor and you should probably put in a high hump floor.

If this is your problem I (or another) can elaborate on adding a high hump floor, it's easy.

bigblock69 · 02-22-2007, 06:33 PM

It is hitting on the transmission cross member. The transmission mount is touching the cross member but, so is the tail housing. If I were to tighten the mount bolts it would probably damage/break the tail housing. Does this help at all?

cdowns · 02-22-2007, 07:01 PM

have you tried reversing the crossmember

bigblock69 · 02-22-2007, 07:09 PM

It only fits one way that I know of.

bigblock69 · 02-22-2007, 07:15 PM

I included the pic of the trans mount in the last one. Figured I would include the eng mounts and towers. Any help would be much appreciated.

bagged91 · 02-22-2007, 07:37 PM

What vehicle did your 700R4 come from? There are 3 different tailshaft housings for a 700R4. The one from the 88-93 C/K pickups should give you the most clearance. The Caprice version has and extra mount built into it and the F-body/Astro Van version has a mount cast into it for the torque arm. The housings are all interchangable... Hope this helps... I will be doing the same swap very soon. Tommorrow, if I get the time & the weather cooperates, I will take some pics for you (I have all 3 under a tarp

)

polevault1977 · 02-22-2007, 07:54 PM

I mocked up my drive line w/ sbc and 700r4. Not sure what my tranny came from, but it too was extremely close on my ece crossmember. Less than a 1/16 of an inch. I have been working on sheetmetal, but thought when I get back on the drive line, I would simply put a .250 shim plate under the mount. I don't see a problem with that. Just my opinion.

bagged91 · 02-22-2007, 08:12 PM

Did a quick search on the net & found this... Hope it helps...

Caprice on LEFT--------- F-Body/Astro Van MIDDLE -------- C/K Pickup on RIGHT

02-22-2007, 06:26 PM	#1
bigblock69 Junior Member Join Date: Jun 2006 Location: St. Louis Posts: 26	700-R4 tail housing trouble I posted yesterday and I got some of my questions answered; however, I have some left unanswered. I am putting a 454 in my 68 C-10. I am using a 700-R4 and an Early Classic transmission cross member. Problem is this. The tail housing is hitting on the cross member. No problems right, just use a spacer. Well I contacted Early Classic and asked if this problem has ever occurred before and there answer is “never heard of it happening before” why are hundreds of Early Classic customers having an outcome other than mine? I am using the correct 67-71 big block engine mount towers and the correct big block engine mounts. The engine and transmission were only sitting/not bolted down when I noticed the tail housing hitting. Could this have something to do with it? I have since pulled both eng and trans out to collect my thought on this. Any help would be greatly appreciated. Last edited by bigblock69; 02-22-2007 at 06:28 PM.

02-22-2007, 06:30 PM	#2
67ChevyRedneck Hittin E-Z Street on Mud Tires Join Date: Nov 2004 Location: Greenville, SC Posts: 23,090	Re: 700-R4 tail housing trouble I'm not sure if I understand your question... is it hitting the floor of the cab? All big block trucks came with a "high hump" floor pan. You can tell if your truck has one by looking at the hump over the transmission. If it is bolted to the floor, you have the correct floor hump. If your floor is one single piece then it's a low hump floor and you should probably put in a high hump floor. If this is your problem I (or another) can elaborate on adding a high hump floor, it's easy. __________________ Jesse James 1967 C10 SWB Stepside: 350/700R4/3.73 1965 Ford Mustang: 289/T5-5spd/3.25 Trac-Loc 1968 Pontiac Firebird: Project Fire Chicken! 2015 Silverado Double Cab 5.3L Z71 2001 Jeep Wrangler Sport 4.0L 5spd 2020 Chevrolet Equinox Premium 2.0L Turbo 2011 Mustang V6 ~ Wife's ride American Born, Country by the Grace of God 1967 CST Shop Truck Rebuild! My 1967 C-10 Build Thread My Vintage Air A/C Install Project "On a Dime" Trying my hand at Home Renovation! 1965 Mustang Modifications! Last edited by 67ChevyRedneck; 02-22-2007 at 06:31 PM.

02-22-2007, 06:33 PM	#3
bigblock69 Junior Member Join Date: Jun 2006 Location: St. Louis Posts: 26	Re: 700-R4 tail housing trouble It is hitting on the transmission cross member. The transmission mount is touching the cross member but, so is the tail housing. If I were to tighten the mount bolts it would probably damage/break the tail housing. Does this help at all?

02-22-2007, 07:01 PM	#4
cdowns Senior Member Join Date: Jan 2003 Location: daytonabeach Posts: 22,956	Re: 700-R4 tail housing trouble have you tried reversing the crossmember __________________ 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

02-22-2007, 07:09 PM	#5
bigblock69 Junior Member Join Date: Jun 2006 Location: St. Louis Posts: 26	Re: 700-R4 tail housing trouble It only fits one way that I know of. Attached Images Last edited by bigblock69; 02-22-2007 at 07:10 PM.

02-22-2007, 07:15 PM	#6
bigblock69 Junior Member Join Date: Jun 2006 Location: St. Louis Posts: 26	Re: 700-R4 tail housing trouble I included the pic of the trans mount in the last one. Figured I would include the eng mounts and towers. Any help would be much appreciated. Attached Images

02-22-2007, 07:37 PM	#7
bagged91 Out draggin' Join Date: Jan 2004 Location: Pitman,NJ Posts: 1,574	Re: 700-R4 tail housing trouble What vehicle did your 700R4 come from? There are 3 different tailshaft housings for a 700R4. The one from the 88-93 C/K pickups should give you the most clearance. The Caprice version has and extra mount built into it and the F-body/Astro Van version has a mount cast into it for the torque arm. The housings are all interchangable... Hope this helps... I will be doing the same swap very soon. Tommorrow, if I get the time & the weather cooperates, I will take some pics for you (I have all 3 under a tarp ) __________________ 91 GMC Xcab LB-Bags/bd/caddy clip SOLD 72 C10 Cheyenne Super LWB SOLD 92 GMC K1500 Burb 72 C10 Burb (ex. Cheesewagon)SOLD 72 C20 Burb parts truck 71 C10 Burb "project" Last edited by bagged91; 02-22-2007 at 08:13 PM.

02-22-2007, 07:54 PM	#8
polevault1977 Pick'n up the pieces! Join Date: Sep 2002 Location: Marietta, Oklahoma Posts: 198	Re: 700-R4 tail housing trouble I mocked up my drive line w/ sbc and 700r4. Not sure what my tranny came from, but it too was extremely close on my ece crossmember. Less than a 1/16 of an inch. I have been working on sheetmetal, but thought when I get back on the drive line, I would simply put a .250 shim plate under the mount. I don't see a problem with that. Just my opinion.

02-22-2007, 08:12 PM	#9
bagged91 Out draggin' Join Date: Jan 2004 Location: Pitman,NJ Posts: 1,574	Re: 700-R4 tail housing trouble Did a quick search on the net & found this... Hope it helps... Caprice on LEFT--------- F-Body/Astro Van MIDDLE -------- C/K Pickup on RIGHT Attached Images __________________ 91 GMC Xcab LB-Bags/bd/caddy clip SOLD 72 C10 Cheyenne Super LWB SOLD 92 GMC K1500 Burb 72 C10 Burb (ex. Cheesewagon)SOLD 72 C20 Burb parts truck 71 C10 Burb "project" Last edited by bagged91; 02-22-2007 at 08:14 PM.

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