700r4 behind 250 - The 1947 - Present Chevrolet & GMC Truck Message Board Network

1lowdiesel · 05-09-2007, 01:10 PM

ok i've looked and looked and can't find anything about putting an auto behind my 6.i know people have done it. but i've even looked on inliners.org and even there i can't find chit. i just recently i put a small block in my 72 but now i'm reconsidering due to rising gas prices seeing how this will be my daily. someone please help point me in the right direction.

thanks kyle

glock35ipsc · 05-09-2007, 02:45 PM

Shouldn't be any different than having a manual tranny in there. The bellhousing should bolt right up.

edmonton72 · 05-09-2007, 02:50 PM

Why don't you try to find a 4.3 v6 with a 700r4 and put it in your truck.

Pyrotechnic · 05-09-2007, 02:50 PM

Shouldn't be any different than bolting it to a 350. As long as you get that thing tuned right, you should be getting some killer gas mileage.

Not to mention, that 3.06 first gear will get you off the line really well.

1lowdiesel · 05-09-2007, 02:51 PM

the 6cyl that i took out ran like a top. and yea the fuel mileage is what i'm after.

Longhorn Man · 05-09-2007, 03:41 PM

hooking up the TV cable will probably be a real PITA, and it is crutial to letting the tranny live for more than a year.
IMO, a stock, well tuned 350 will probably do about the same MPG wise. There's a few ppl who get lucky and claim 25 MPG or something crazy... but moving your rig through the aire kills the MPG regardless of what you have pushing it. You'll probably get better MPG rewards by getting the carb dialed in perfect, and learning to drive like a little old lady.

bagged91 · 05-09-2007, 04:09 PM

Instead of the 700R4 swap, you could also swap over either a 200R4 which is the same length as a TH350shortshaft(what our trucks take) or talk to NitroMike... He is running an I6 wtih a T-5 tranny behind it. He said he likes it a lot...

A 307 is often underrated, but they do get EXCLELLENT gas milage... That is another option to consider...

L8R - Joe

faribran · 05-09-2007, 04:26 PM

the suggestion of the 4.3 sounds like the avenue i would take.... i have never been able to get any gas mileage from the inline 250.

1lowdiesel · 05-09-2007, 04:27 PM

little old lady...yea thats not gonna happen unless i run the 6.the thing is i just put a cam,carb,intake,rockers,lifters,and headers on it so.. at least i'll have a nice motor for my dad's.

hmmm, forgot about the tv cable, i'm sure i can rig something up though.

yea joe i thought about the t-5 but i'd rather have the auto. not to mention i already have 2 700r4's and a th350.

1lowdiesel · 05-09-2007, 04:28 PM

Quote:

Originally Posted by faribran

the suggestion of the 4.3 sounds like the avenue i would take.... i have never been able to get any gas mileage from the inline 250.

whats never?

nvrforgotten52 · 05-09-2007, 04:33 PM

im sure its possible to rig up a tv cable... it just may be a pain cuz the carb linkage is like sidways compared to a normal 4bbl on a small block

onetonk5 · 05-09-2007, 06:08 PM

Just a fwiw TCI just came out with a new valve body for a 700r4 that makes TV cable adjustment much less critical. Its part # 376020 if your interested. I just so happened to recieve mine yesterday.

NitroMike · 05-09-2007, 06:14 PM

I do love my Tremec .64 high gear 5 speed behind my 250. Got 20.5 MPG going to and from jc's. And shifting is still fun when you don't have to do it every day. If I drove this truck everyday it would have a 700r4.

1lowdiesel · 05-11-2007, 10:24 AM

hey what about the flywheel/ can i use the small block one?

05-09-2007, 01:10 PM	#1
1lowdiesel Senior Member Join Date: Oct 2006 Location: central jersey Posts: 763	700r4 behind my 250...please help me do it. ok i've looked and looked and can't find anything about putting an auto behind my 6.i know people have done it. but i've even looked on inliners.org and even there i can't find chit. i just recently i put a small block in my 72 but now i'm reconsidering due to rising gas prices seeing how this will be my daily. someone please help point me in the right direction. thanks kyle __________________ 69 4wd V6 20k orig miles!! 05 ccsb 2wd Diesel 500hp bagged and soon to be stock floored. 01 rcsb chevy 2wd 6bt cummins :devil:> build xtremediesel.com Last edited by 1lowdiesel; 05-09-2007 at 01:11 PM.

05-09-2007, 02:45 PM	#2
glock35ipsc Next project: 1970 K10 Join Date: Feb 2004 Location: Fort Collins, Colo 80524 Posts: 6,685	Re: 700r4 behind 250 Shouldn't be any different than having a manual tranny in there. The bellhousing should bolt right up. __________________ *Bob* 1970 Chevy K10 LWB "Goldie" 350/TH350 *next project!!* 1981 Chevy C10 LWB 355/TH350 - My son's truck LS SWAP FORUM! Tons of LS swap info here! PLEASE CLICK HERE TO SUPPORT THE GREATEST BOARD ON THE NET! CLICK HERE FOR THE FAQ INDEX by KRUE

05-09-2007, 02:50 PM	#3
edmonton72 Nothings as cool as my 72 Join Date: May 2005 Location: Edmonton, AB, Kanuckastan Posts: 181	Re: 700r4 behind 250 Why don't you try to find a 4.3 v6 with a 700r4 and put it in your truck. __________________ 1972 C10 Longbox In the middle of body off restoration Rebuilt 355, turbo 400, 3.42 12-bolt Rolling chassis finally done and cab mounted. Now onto sanding, bondo and more sanding.

05-09-2007, 02:50 PM	#4
Pyrotechnic Registered User Join Date: Feb 2007 Location: Austin, TX Posts: 3,930	Re: 700r4 behind 250 Shouldn't be any different than bolting it to a 350. As long as you get that thing tuned right, you should be getting some killer gas mileage. Not to mention, that 3.06 first gear will get you off the line really well.

05-09-2007, 02:51 PM	#5
1lowdiesel Senior Member Join Date: Oct 2006 Location: central jersey Posts: 763	Re: 700r4 behind 250 the 6cyl that i took out ran like a top. and yea the fuel mileage is what i'm after. __________________ 69 4wd V6 20k orig miles!! 05 ccsb 2wd Diesel 500hp bagged and soon to be stock floored. 01 rcsb chevy 2wd 6bt cummins :devil:> build xtremediesel.com Last edited by 1lowdiesel; 05-09-2007 at 02:52 PM.

05-09-2007, 03:41 PM	#6
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	Re: 700r4 behind 250 hooking up the TV cable will probably be a real PITA, and it is crutial to letting the tranny live for more than a year. IMO, a stock, well tuned 350 will probably do about the same MPG wise. There's a few ppl who get lucky and claim 25 MPG or something crazy... but moving your rig through the aire kills the MPG regardless of what you have pushing it. You'll probably get better MPG rewards by getting the carb dialed in perfect, and learning to drive like a little old lady.

05-09-2007, 04:09 PM	#7
bagged91 Out draggin' Join Date: Jan 2004 Location: Pitman,NJ Posts: 1,574	Re: 700r4 behind 250 Instead of the 700R4 swap, you could also swap over either a 200R4 which is the same length as a TH350shortshaft(what our trucks take) or talk to NitroMike... He is running an I6 wtih a T-5 tranny behind it. He said he likes it a lot... A 307 is often underrated, but they do get EXCLELLENT gas milage... That is another option to consider... L8R - Joe __________________ 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"

05-09-2007, 04:26 PM	#8
faribran Registered User Join Date: Jul 2005 Location: AL Posts: 1,828	Re: 700r4 behind 250 the suggestion of the 4.3 sounds like the avenue i would take.... i have never been able to get any gas mileage from the inline 250. __________________ "

05-09-2007, 04:27 PM	#9
1lowdiesel Senior Member Join Date: Oct 2006 Location: central jersey Posts: 763	Re: 700r4 behind 250 little old lady...yea thats not gonna happen unless i run the 6.the thing is i just put a cam,carb,intake,rockers,lifters,and headers on it so.. at least i'll have a nice motor for my dad's. hmmm, forgot about the tv cable, i'm sure i can rig something up though. yea joe i thought about the t-5 but i'd rather have the auto. not to mention i already have 2 700r4's and a th350. __________________ 69 4wd V6 20k orig miles!! 05 ccsb 2wd Diesel 500hp bagged and soon to be stock floored. 01 rcsb chevy 2wd 6bt cummins :devil:> build xtremediesel.com

05-09-2007, 04:33 PM	#11
nvrforgotten52 Registered User Join Date: Jan 2006 Location: Morro Bay C.A Posts: 179	Re: 700r4 behind 250 im sure its possible to rig up a tv cable... it just may be a pain cuz the carb linkage is like sidways compared to a normal 4bbl on a small block __________________ '69 C10 SWB 350 edelbrock int/carb .420 .442 cam 700r4 70 lwb c10 work truck 250 I6 with two inch lift springs and a two inch bodylift and 33/12.5s

05-09-2007, 06:08 PM	#12
onetonk5 Cereal Killer Join Date: Jan 2006 Location: Montgomery, Alabama Posts: 639	Re: 700r4 behind 250 Just a fwiw TCI just came out with a new valve body for a 700r4 that makes TV cable adjustment much less critical. Its part # 376020 if your interested. I just so happened to recieve mine yesterday. __________________ If I dont do it....somebody else will.

05-09-2007, 06:14 PM	#13
NitroMike Active Member Join Date: Dec 2005 Location: Bethlehem, PA Posts: 346	Re: 700r4 behind 250 I do love my Tremec .64 high gear 5 speed behind my 250. Got 20.5 MPG going to and from jc's. And shifting is still fun when you don't have to do it every day. If I drove this truck everyday it would have a 700r4. __________________ The older I get, the faster I was!!

05-11-2007, 10:24 AM	#14
1lowdiesel Senior Member Join Date: Oct 2006 Location: central jersey Posts: 763	Re: 700r4 behind 250 hey what about the flywheel/ can i use the small block one? __________________ 69 4wd V6 20k orig miles!! 05 ccsb 2wd Diesel 500hp bagged and soon to be stock floored. 01 rcsb chevy 2wd 6bt cummins :devil:> build xtremediesel.com



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