how does a 4 speed run behind a 250 - The 1947 - Present Chevrolet & GMC Truck Message Board Network

threeonthetree · 08-07-2009, 06:26 PM

thinking about picking up this truck it has a six with a standard trans
and a smooth column the guy doesn't want much for it and i was thinking about getting it
but does anyone have a 250 with a 4speed behind it how does it run?

lilred67 · 08-07-2009, 06:34 PM

my '67 had a six cylinder/4 speed. i liked it. still have the 4 speed but upgraded the motor to a 350.. some of these trucks came from the factory 6 cyl./4 speed.

Ackattack · 08-07-2009, 06:36 PM

don't know why it would really matter if it was a 3 or 4 speed, the top gear is going to be 1:1 either way. Just no stupid column shifter.

threeonthetree · 08-07-2009, 06:38 PM

will i have to mod the floor to get the four speed in there?

sharpmark · 08-07-2009, 07:14 PM

my 69 has 250/4spd and 4.11 diff gears and i drive it to work everyday and i'm happy with it.never use first gear and will probably change the diff gears soon to keep the revs down abit.did a 450 mile trip in it a few weekends ago and found the petrol mileage was similar to the same trip in my 69 350/2spd auto pontiac lemans convert.have decided to keep the truck i6 cause everybody else over here puts a v8 in them and this truck is cool as it is.have a clifford inlet manifold and 350 holley to put on it and will make my own headers and dual exhaust.

68Stepbed · 08-08-2009, 07:23 AM

Is it a bulldog 4spd or a regukar 4spd? In a bulldog, 2nd,3rd,and 4th are the same ratios as 1st,2nd and 3rd in a 3spd. 1st gear is just very low for pulling and mostly used for a really slow moving speed for farm use.

If it's a regular 4spd, like a Muncie or Saginaw, I would say to get it. The final drive gear is still 1:1 like the 3spd, but with closer gear splits.

Elephanthead · 08-08-2009, 09:34 AM

Inline 6s are inherently balanced. It is probably the best cylinder arrangement you can have in an engine. It makes plenty of power, if that is your concern. I love inline 6s, I am collecting a car of each type, I have a 292 chevy, 4.0 jeep, I need toyota, a bmw and a ford.

Ackattack · 08-08-2009, 10:32 AM

Quote:

Originally Posted by Elephanthead

Inline 6s are inherently balanced. It is probably the best cylinder arrangement you can have in an engine. It makes plenty of power, if that is your concern. I love inline 6s, I am collecting a car of each type, I have a 292 chevy, 4.0 jeep, I need toyota, a bmw and a ford.

Don't forget the newer 4.2 vortecs in the trailblazers

Tx Firefighter · 08-08-2009, 03:52 PM

You're gonna need a high hump for a truck 4 speed.

turp mcspray · 08-08-2009, 04:00 PM

If you're gonna have a 6, I think a 4 speed is the only way to go. I had a 69 4x4 once with a 292 4spd. I think the 6 needs all the help it can get. Mine got crappy milage and NO power to boot. I can't imagine anyone wanting a 6 but to each his own. No offense to all the 6 lovers out there!!

culp7 · 04-09-2010, 09:29 AM

Quote:

Originally Posted by turp mcspray

If you're gonna have a 6, I think a 4 speed is the only way to go. I had a 69 4x4 once with a 292 4spd. I think the 6 needs all the help it can get. Mine got crappy milage and NO power to boot. I can't imagine anyone wanting a 6 but to each his own. No offense to all the 6 lovers out there!!

i have a 250/4speed in my 68, and mine gets around 15 MPG in town/highway driving and has plenty of power for a six

**slomotion** · 04-09-2010, 12:47 PM

I have to jump in here...I'm running a 292 4bbl with a WC T5 and love it. Plenty of torque, good gear ratios, and reasonable mileage for the weight of the truck. I don't agree that the I6's have "no power", I have all the power I need for the truck's intended purpose.

Keith Seymore · 04-09-2010, 01:10 PM

We've had a couple and they're great.

Incidently, our '69 GMC would routinely outrun a fella at work who had a V8 truck: 292 L6 punched to 305, true duals, 3x2 Rochesters with a Pontiac progressive linkage, Hurst shifted 3.11 low gear Saginaw 4 speed with 3.73 gears...

Just about every time he'd make a tweak, we'd make a comparable change and run 'em off. He never did beat us across the intersection - which frustrated him to no end cause he knew ours was a 6.

K

Shaky · 04-09-2010, 05:02 PM

I have a 250 with a Richmond 5-speed behind it and another truck with a 292 and SM420 4-speed. I like 'em.

NicoSlam · 04-09-2010, 05:31 PM

I'm running an I6 with a 4speed overdrive. I love the pur they make at 600rpm's

kyull67 · 04-09-2010, 10:48 PM

I run the 250 with the four on the floor. Check my build thread for more info, I would bet money it out runs most 350's out there. I love it!

Shyguy · 04-10-2010, 07:56 AM

My old '67 swb has a stock 4 speed behind a '70 i-6.

It is not running great, carb problem I think, but it will make the rear tires spin it I want when taking off. I am not sure of the rear end gearing though since I have never taken the cover off and checked, probably 3.73.

Danny

LMN8UR · 04-10-2010, 08:18 AM

Don't forget the 3 speed overdrives! The NP833 (MY6 code) from the 80's is a direct replacement for the Saginaw 3 speed. You get a 3.09 first gear and 0.76 overdrive (fourth). Best move I've done with mine.

You will need to cut a hole for the shifter of course.

Good Luck.

08-07-2009, 06:26 PM	#1
threeonthetree Registered User Join Date: Feb 2009 Location: Wausau, WI Posts: 975	how does a 4 speed run behind a 250 thinking about picking up this truck it has a six with a standard trans and a smooth column the guy doesn't want much for it and i was thinking about getting it but does anyone have a 250 with a 4speed behind it how does it run? __________________ Smoking Tires Since 1992 1969 c10 AKA SIN 1985 SSWB TRAZER (super short wheel base)

08-07-2009, 06:34 PM	#2
lilred67 Senior Member Join Date: Mar 2005 Location: weatherford,texas Posts: 1,003	Re: how does a 4 speed run behind a 250 my '67 had a six cylinder/4 speed. i liked it. still have the 4 speed but upgraded the motor to a 350.. some of these trucks came from the factory 6 cyl./4 speed.

08-07-2009, 06:36 PM	#3
Ackattack Senior Member Join Date: Aug 2002 Location: Valley Center KS Posts: 3,525	Re: how does a 4 speed run behind a 250 don't know why it would really matter if it was a 3 or 4 speed, the top gear is going to be 1:1 either way. Just no stupid column shifter. __________________ Project Bruiser: 68 Pro-Touring C-10 5.3L / 4L60E Project Ironhide: 97 GMC Crew Cab 4x4 Cummins SOLD: '69 GMC 1/2T SWB TBI'd: Project No Buck Assembly Manual Index Sign up Thread!!! Factory Service Manual Index

08-07-2009, 06:38 PM	#4
threeonthetree Registered User Join Date: Feb 2009 Location: Wausau, WI Posts: 975	Re: how does a 4 speed run behind a 250 will i have to mod the floor to get the four speed in there? __________________ Smoking Tires Since 1992 1969 c10 AKA SIN 1985 SSWB TRAZER (super short wheel base)

08-07-2009, 07:14 PM	#5
sharpmark Registered User Join Date: Mar 2009 Location: rotorua/new zealand Posts: 161	Re: how does a 4 speed run behind a 250 my 69 has 250/4spd and 4.11 diff gears and i drive it to work everyday and i'm happy with it.never use first gear and will probably change the diff gears soon to keep the revs down abit.did a 450 mile trip in it a few weekends ago and found the petrol mileage was similar to the same trip in my 69 350/2spd auto pontiac lemans convert.have decided to keep the truck i6 cause everybody else over here puts a v8 in them and this truck is cool as it is.have a clifford inlet manifold and 350 holley to put on it and will make my own headers and dual exhaust.

08-08-2009, 07:23 AM	#6
68Stepbed Registered User Join Date: Mar 2005 Location: 10-Uh-See Posts: 5,609	Re: how does a 4 speed run behind a 250 Is it a bulldog 4spd or a regukar 4spd? In a bulldog, 2nd,3rd,and 4th are the same ratios as 1st,2nd and 3rd in a 3spd. 1st gear is just very low for pulling and mostly used for a really slow moving speed for farm use. If it's a regular 4spd, like a Muncie or Saginaw, I would say to get it. The final drive gear is still 1:1 like the 3spd, but with closer gear splits. __________________ Matt 68 C10 stepside, LS1/700R4, TCI Engineering suspension system

08-08-2009, 09:34 AM	#7
Elephanthead Registered User Join Date: Nov 2008 Location: Carmel, IN Posts: 187	Re: how does a 4 speed run behind a 250 Inline 6s are inherently balanced. It is probably the best cylinder arrangement you can have in an engine. It makes plenty of power, if that is your concern. I love inline 6s, I am collecting a car of each type, I have a 292 chevy, 4.0 jeep, I need toyota, a bmw and a ford.

08-08-2009, 03:52 PM	#9
Tx Firefighter Watch out for your cornhole ! Join Date: Jun 2003 Location: Azle, Texas Posts: 14,162	Re: how does a 4 speed run behind a 250 You're gonna need a high hump for a truck 4 speed. __________________ I'm on the Instagram- @Gearhead_Kevin

08-08-2009, 04:00 PM	#10
turp mcspray Registered User Join Date: May 2007 Location: Rapid City South Dakota Posts: 2,359	Re: how does a 4 speed run behind a 250 If you're gonna have a 6, I think a 4 speed is the only way to go. I had a 69 4x4 once with a 292 4spd. I think the 6 needs all the help it can get. Mine got crappy milage and NO power to boot. I can't imagine anyone wanting a 6 but to each his own. No offense to all the 6 lovers out there!! __________________ Turp Mcspray New life for an old 2wd, farm blazer http://67-72chevytrucks.com/vboard/s...d.php?t=505987 My Blazer build http://67-72chevytrucks.com/vboard/s...d.php?t=342299

04-09-2010, 12:47 PM	#12
slomotion Old Duffer Join Date: Mar 2003 Location: Maine Posts: 1,822	Re: how does a 4 speed run behind a 250 I have to jump in here...I'm running a 292 4bbl with a WC T5 and love it. Plenty of torque, good gear ratios, and reasonable mileage for the weight of the truck. I don't agree that the I6's have "no power", I have all the power I need for the truck's intended purpose. __________________ '68 Short C20 Flatbed Dually w/ 292 4bbl, Langdon cast headers, and WC T5 trans. '81 G10 Shorty Van "Good judgement comes from experience, and a lot of that comes from bad judgement." Will Rogers "Under promise, then over achieve."

04-09-2010, 01:10 PM	#13
Keith Seymore Registered User Join Date: May 2009 Location: Motor City Posts: 9,213	Re: how does a 4 speed run behind a 250 We've had a couple and they're great. Incidently, our '69 GMC would routinely outrun a fella at work who had a V8 truck: 292 L6 punched to 305, true duals, 3x2 Rochesters with a Pontiac progressive linkage, Hurst shifted 3.11 low gear Saginaw 4 speed with 3.73 gears... Just about every time he'd make a tweak, we'd make a comparable change and run 'em off. He never did beat us across the intersection - which frustrated him to no end cause he knew ours was a 6. K __________________ Chevrolet Flint Assembly 1979-1986 GM Full Size Truck Engineering 1986 - 2019 Intro from an Old Assembly Guy: http://67-72chevytrucks.com/vboard/s...d.php?t=342926 My Pontiac story: http://forums.maxperformanceinc.com/...d.php?t=560524 Chevelle intro: http://www.superchevy.com/features/s...hevy-chevelle/ Last edited by Keith Seymore; 04-09-2010 at 01:15 PM.

04-09-2010, 05:02 PM	#14
Shaky Six in a row makes it go... Join Date: Mar 2009 Location: Vacationland: Maine Posts: 1,346	Re: how does a 4 speed run behind a 250 I have a 250 with a Richmond 5-speed behind it and another truck with a 292 and SM420 4-speed. I like 'em. __________________ 67 C20 long step resto: http://67-72chevytrucks.com/vboard/s...d.php?t=342086 66 C10 long step build: http://67-72chevytrucks.com/vboard/s...=1#post3814790 CT to Alaska in a 67 C10: http://67-72chevytrucks.com/vboard/s...d.php?t=399224 “The height of sophistication is simplicity." - Clare Boothe Luce

04-09-2010, 05:31 PM	#15
NicoSlam Registered User Join Date: Nov 2009 Location: San Antonio TX Posts: 251	Re: how does a 4 speed run behind a 250 I'm running an I6 with a 4speed overdrive. I love the pur they make at 600rpm's

04-09-2010, 10:48 PM	#16
kyull67 Registered User Join Date: Nov 2006 Location: Springfield/Kansas City Posts: 1,842	Re: how does a 4 speed run behind a 250 I run the 250 with the four on the floor. Check my build thread for more info, I would bet money it out runs most 350's out there. I love it! __________________ The first '67 The current '67 '63 Biscayne

04-10-2010, 07:56 AM	#17
Shyguy Junior Member Join Date: Dec 2006 Location: Southeast Missouri Posts: 2,436	Re: how does a 4 speed run behind a 250 My old '67 swb has a stock 4 speed behind a '70 i-6. It is not running great, carb problem I think, but it will make the rear tires spin it I want when taking off. I am not sure of the rear end gearing though since I have never taken the cover off and checked, probably 3.73. Danny __________________ '67 Chevy C-20 short stepper - build complete, 454/SM-465. '75 C-30 Single Cab DRW-350 small block/NP-435. '77 GMC-6500 Dump Truck, 427 Tall Deck. '92 GMC K-3500 Duallie, 454/4L80E.



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04-10-2010, 08:18 AM	#18
LMN8UR Registered User Join Date: Jun 2005 Location: Midlothian, VA Posts: 148	Re: how does a 4 speed run behind a 250 Don't forget the 3 speed overdrives! The NP833 (MY6 code) from the 80's is a direct replacement for the Saginaw 3 speed. You get a 3.09 first gear and 0.76 overdrive (fourth). Best move I've done with mine. You will need to cut a hole for the shifter of course. Good Luck. __________________ 72 Chevy C-10 Custom LWB 383 Stroker - Edlebrock Air Gap intake and 670 CFM Holley Street Avenger carb. Hooker Comp Headers w/ X-Pipe and 2.25 duals TKO-500 & 3.08:1 rear I Love HEMI's, they're soft & chewy!

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