Help with new 327 and original gears - The 1947 - Present Chevrolet & GMC Truck Message Board Network

ZombieWeinerDog · 04-13-2009, 10:37 AM

I have put a 300 horse 327 in my 72 longbox c10. it has the original 3 speed tranny and original gears in the rear. will this be good enough for highway use? anyone have experience using this setup?

ZombieWeinerDog · 04-13-2009, 10:54 AM

really need help

ZombieWeinerDog · 04-13-2009, 10:57 AM

another question, will it go highway speeds under 3000 rpm? i dont want to waste gas like that

**tnblazerk5** · 04-13-2009, 10:58 AM

the 327 will do fine and the 3 on the tree will be fine as for the rearend it depends on what gear is in there for interstate use or not

**americanmusc1e** · 04-13-2009, 11:27 AM

Quote:

Originally Posted by ZombieWeinerDog

another question, will it go highway speeds under 3000 rpm? i dont want to waste gas like that

my 350/th350 with a 3.08 did almost 3000, if its a manual it would probably do between 2500 and 2700 at 70

ZombieWeinerDog · 04-13-2009, 12:21 PM

im not positivly sure what gears are in the rear, but they are the stock ones that came with the custom 10 inline 6 half ton

davidh · 04-13-2009, 01:04 PM

likely 3.73 gears if it was 6cyl, 3 rower.

ZombieWeinerDog · 04-13-2009, 01:13 PM

nowthat i think about it they are 3.73

**special-K** · 04-13-2009, 01:17 PM

By today`s standards,anything w/o overdrive screams at hiway speeds.Going by what these trucks were built for when new,it`ll be just fine.Will it cruise below 3,000 at 70...nope.Sounds great and I love it.I remember the new vehicles coming out with o/d and thinking what a gutless droan they made.Times have changed,that`s for sure.

ZombieWeinerDog · 04-13-2009, 01:23 PM

Quote:

Originally Posted by special-K

By today`s standards,anything w/o overdrive screams at hiway speeds.Going by what these trucks were built for when new,it`ll be just fine.Will it cruise below 3,000 at 70...nope.Sounds great and I love it.I remember the new vehicles coming out with o/d and thinking what a gutless droan they made.Times have changed,that`s for sure.

what do you think it will cruise at?

davidh · 04-13-2009, 01:41 PM

6cyl, 3speeds cruise at 60mph with 3.73s fine. what size tires you have?

ZombieWeinerDog · 04-13-2009, 01:53 PM

i am not sure what size tires i have but i have the stock wheels. i would imagine that the wheels would be close to the same. i also have a v8

davidh · 04-13-2009, 02:58 PM

you can run a little taller tire on stock wheel, an allterrain 30X9.50 and run 65mph just fine

**americanmusc1e** · 04-13-2009, 04:11 PM

Quote:

Originally Posted by ZombieWeinerDog

I have put a 300 horse 327 in my 72 longbox c10. it has the original 3 speed tranny and original gears in the rear. will this be good enough for highway use? anyone have experience using this setup?

did the truck come with a v8 or an I6

v8's came standard with 3.08's

I6's came with deeper gears, 3.73's I think

Longhorn Man · 04-13-2009, 04:16 PM

Quote:

Originally Posted by americanmusc1e

my 350/th350 with a 3.08 did almost 3000, if its a manual it would probably do between 2500 and 2700 at 70

Unless you have real small tires, then something isn't right. An automatic with a 3.07 gear and 28 inch tall tires should cruise at about 2600 - 2700 @ 60... the pic shows both a little below.
As far as the gearing, 3 on the column came with a 3.73 regardless if it was a small block or an inline... unless otherwise optioned.

**americanmusc1e** · 04-13-2009, 10:32 PM

Quote:

Originally Posted by Longhorn Man

Unless you have real small tires, then something isn't right. An automatic with a 3.07 gear and 28 inch tall tires should cruise at about 2600 - 2700 @ 60... the pic shows both a little below.
As far as the gearing, 3 on the column came with a 3.73 regardless if it was a small block or an inline... unless otherwise optioned.

3000 at 70 which is more like 75 if my speedo wasn't off, at 60 it did about 2600 I think, now I have a 700r4 and do 1800 at 70

04-13-2009, 10:37 AM	#1
ZombieWeinerDog Registered User Join Date: Oct 2008 Location: Sparta, MI Posts: 446	Help with new 327 and original gears I have put a 300 horse 327 in my 72 longbox c10. it has the original 3 speed tranny and original gears in the rear. will this be good enough for highway use? anyone have experience using this setup? __________________ 1972 longbed- 454 1967 shortbed- 355

04-13-2009, 10:54 AM	#2
ZombieWeinerDog Registered User Join Date: Oct 2008 Location: Sparta, MI Posts: 446	Re: Help with new 327 and original gears really need help __________________ 1972 longbed- 454 1967 shortbed- 355

04-13-2009, 10:57 AM	#3
ZombieWeinerDog Registered User Join Date: Oct 2008 Location: Sparta, MI Posts: 446	Re: Help with new 327 and original gears another question, will it go highway speeds under 3000 rpm? i dont want to waste gas like that __________________ 1972 longbed- 454 1967 shortbed- 355

04-13-2009, 10:58 AM	#4
tnblazerk5 User #12137 Join Date: Apr 2004 Location: kingsport,upper east tenn Posts: 11,598	Re: Help with new 327 and original gears the 327 will do fine and the 3 on the tree will be fine as for the rearend it depends on what gear is in there for interstate use or not

04-13-2009, 12:21 PM	#6
ZombieWeinerDog Registered User Join Date: Oct 2008 Location: Sparta, MI Posts: 446	Re: Help with new 327 and original gears im not positivly sure what gears are in the rear, but they are the stock ones that came with the custom 10 inline 6 half ton __________________ 1972 longbed- 454 1967 shortbed- 355

04-13-2009, 01:04 PM	#7
davidh Senior Member Join Date: Feb 2004 Location: Ponca city now kingfisher Oklahoma Posts: 1,221	Re: Help with new 327 and original gears likely 3.73 gears if it was 6cyl, 3 rower. __________________ Even the nicest dodge-chrysler is only 2years away from being parked outside of Section 8 housing.

04-13-2009, 01:13 PM	#8
ZombieWeinerDog Registered User Join Date: Oct 2008 Location: Sparta, MI Posts: 446	Re: Help with new 327 and original gears nowthat i think about it they are 3.73 __________________ 1972 longbed- 454 1967 shortbed- 355

04-13-2009, 01:17 PM	#9
special-K Special Order Join Date: Nov 2004 Location: Mt Airy, MD Posts: 85,862	Re: Help with new 327 and original gears By today`s standards,anything w/o overdrive screams at hiway speeds.Going by what these trucks were built for when new,it`ll be just fine.Will it cruise below 3,000 at 70...nope.Sounds great and I love it.I remember the new vehicles coming out with o/d and thinking what a gutless droan they made.Times have changed,that`s for sure. __________________ "BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project) GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling) Tim "Don't call me a redneck. I'm a rough cut country gentleman" R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~

04-13-2009, 01:41 PM	#11
davidh Senior Member Join Date: Feb 2004 Location: Ponca city now kingfisher Oklahoma Posts: 1,221	Re: Help with new 327 and original gears 6cyl, 3speeds cruise at 60mph with 3.73s fine. what size tires you have? __________________ Even the nicest dodge-chrysler is only 2years away from being parked outside of Section 8 housing.

04-13-2009, 01:53 PM	#12
ZombieWeinerDog Registered User Join Date: Oct 2008 Location: Sparta, MI Posts: 446	Re: Help with new 327 and original gears i am not sure what size tires i have but i have the stock wheels. i would imagine that the wheels would be close to the same. i also have a v8 __________________ 1972 longbed- 454 1967 shortbed- 355

04-13-2009, 02:58 PM	#13
davidh Senior Member Join Date: Feb 2004 Location: Ponca city now kingfisher Oklahoma Posts: 1,221	Re: Help with new 327 and original gears you can run a little taller tire on stock wheel, an allterrain 30X9.50 and run 65mph just fine __________________ Even the nicest dodge-chrysler is only 2years away from being parked outside of Section 8 housing.



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