3.07 gears 3 speed with a 292? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

davidh · 04-10-2009, 07:53 PM

Instead of looking for an OD or finding the right T5 for my 67 C10 I thought of changing the rear to a 3.07. I have both a 3.73 and 3.07 5 lug. In the process of changing out front end.
I plan on using this as a truck but if its a real heavy load I'll just get my 3/4 ton. Might hall the occasional one axle trailer, bed full of parts, tree limbs etc. I'd like to be able to run 65 to 70 mph empty on the hwy. I have a freshened up 292, 3on the tree. Previously I had a low mileage 67 with a 250, 3speed and 3.73 with the 30X9.50's it wasnt bad with the little taller tire..
Anyone run this combo 6cyl and 3.07?

Green Machine · 04-10-2009, 08:24 PM

292 should have plenty of torque to pull the 3.07 gears. I'd do it !

BCOWANWHEELS · 04-10-2009, 09:06 PM

i,d hunt a sm465, 4 speed trany personally that way you still have a low enough 1st gear to pull a load on takeoff . where it will kill you is backing up and pulling out and if your on a incline it will kill your clutch. been a 3 on the tree man all my life and been there done that.

Longhorn Man · 04-10-2009, 10:02 PM

the 4 speeds came with a 3.07, so i don't see where this would be any different as far as clutch wear. Do it. If a 292 can't handle an empty truck witha freeway gear, then it needs pitched.

**special-K** · 04-11-2009, 04:47 PM

Sounds like a good plan.I just don`t like 3spds.As said,1st/reverse is so high you get chatter on hills and with loads when starting off.You can find a granny 4spd and slap it in easy and cheap at some point.

BCOWANWHEELS · 04-11-2009, 05:48 PM

4 speed tranys have a much lower first & reverse and i,ve never seen one come factory with a 3.08 gear

Brad · 04-25-2009, 11:43 AM

I realize this may be apple & oranges, but fwiw I put 3.07 behind a 250 in my old '67 and while it did great at cruising speeds and above, I had to use alot of clutch at stop signs to get it up and going.

Shaky · 04-25-2009, 12:21 PM

We put 3.07 gears in my buddy's '67 C10 with a 250 and 3/tree. Drove it to Alaska. No problem. Heavy load might be tough on the clutch though.

54blackhornet · 04-25-2009, 01:06 PM

I have a 68 GMC custom 1500, it was original with a 250 3 on tree.
GMC's have no spid so I can't tell what rearend I have, It now has a 292 30 over in it, you have to slip it pretty good to get it going but boy does it have torque. Any suggestions on how to determine what gear I have

Longhorn Man · 04-25-2009, 01:58 PM

pop the cover off and count the teeth. The oil os probably 20+ years old anyways and no longer doing the job it was designed to do.
And not all GMC trucks were SPID-less.

Shaky · 04-25-2009, 03:05 PM

Quote:

Originally Posted by 54blackhornet

I have a 68 GMC custom 1500, it was original with a 250 3 on tree.
GMC's have no spid so I can't tell what rearend I have, It now has a 292 30 over in it, you have to slip it pretty good to get it going but boy does it have torque. Any suggestions on how to determine what gear I have

Make a chalk mark on a rear tire. Hold the other if it is an open rear. Rotate the tire one revolution and count the number of times the drive shaft turns. If you're careful doing this you should be able to figure out the ratio.

If you pop the rear cover, look for the numbers on the outer diameter of the ring gear. Should say 40 13 or 41-11. Divide the big one by the little one. 40/13=3.07, 41/11=3.73, etc.

68gmsee · 04-25-2009, 05:00 PM

Quote:

Originally Posted by 54blackhornet

I have a 68 GMC custom 1500, it was original with a 250 3 on tree.
GMC's have no spid so I can't tell what rearend I have, It now has a 292 30 over in it, you have to slip it pretty good to get it going but boy does it have torque. Any suggestions on how to determine what gear I have

My 68 is original with a 250 three speed on the column and has a 3.54 dana 44 rear axle.

Tx Firefighter · 04-25-2009, 08:51 PM

In my 72, I used to run a tired 292, 3 speed and 3.08 gears. No complaint ever. Even my tired 292 never dissapointed me.

vasquezmrysvll · 04-25-2009, 09:24 PM

sorry to hijack.....but, i have a 67 shorty with rebuilt 250,hei,powerglide and 3.07 rear. im not planning on hauling loads,just cruisin. will this thing get out of its own way? i drove it on the property, never fast enough to get in to high. again sorry for the hijack.

Brad · 04-26-2009, 08:55 AM

Quote:

Originally Posted by vasquezmrysvll

sorry to hijack.....but, i have a 67 shorty with rebuilt 250,hei,powerglide and 3.07 rear. im not planning on hauling loads,just cruisin. will this thing get out of its own way? i drove it on the property, never fast enough to get in to high. again sorry for the hijack.

It's got to be sluggish off the line, especially with that PG. Seems you've already figured that out.

Shaky · 04-26-2009, 10:07 AM

Quote:

Originally Posted by vasquezmrysvll

sorry to hijack.....but, i have a 67 shorty with rebuilt 250,hei,powerglide and 3.07 rear. im not planning on hauling loads,just cruisin. will this thing get out of its own way? i drove it on the property, never fast enough to get in to high. again sorry for the hijack.

I've had a number of GM cars over the years that came with a PG and 250. The easy fix was always to swap in a TH350. No driveshaft change. Even the shift linkage would bolt up, but you wouldn't be able to get 1st.

The nice thing was you got a lower 1st gear with the same top gear. Made it a different vehicle.

vasquezmrysvll · 04-26-2009, 10:13 AM

i may do that. as for not getting first, the column is from a th350 truck

. now i geuss i need to look for a radiator with a cooler. my glide is air cooled

Shaky · 04-26-2009, 10:19 AM

Quote:

Originally Posted by vasquezmrysvll

i may do that. as for not getting first, the column is from a th350 truck

. now i geuss i need to look for a radiator with a cooler. my glide is air cooled

Or just run a big stand alone cooler. Ditch the air-cooled 2-speed.

04-10-2009, 07:53 PM	#1
davidh Senior Member Join Date: Feb 2004 Location: Ponca city now kingfisher Oklahoma Posts: 1,221	3.07 gears 3 speed with a 292? Instead of looking for an OD or finding the right T5 for my 67 C10 I thought of changing the rear to a 3.07. I have both a 3.73 and 3.07 5 lug. In the process of changing out front end. I plan on using this as a truck but if its a real heavy load I'll just get my 3/4 ton. Might hall the occasional one axle trailer, bed full of parts, tree limbs etc. I'd like to be able to run 65 to 70 mph empty on the hwy. I have a freshened up 292, 3on the tree. Previously I had a low mileage 67 with a 250, 3speed and 3.73 with the 30X9.50's it wasnt bad with the little taller tire.. Anyone run this combo 6cyl and 3.07? __________________ Even the nicest dodge-chrysler is only 2years away from being parked outside of Section 8 housing.

04-10-2009, 08:24 PM	#2
Green Machine Senior Member Join Date: Jul 2004 Location: Estherville, Iowa Posts: 3,371	Re: 3.07 gears 3 speed with a 292? 292 should have plenty of torque to pull the 3.07 gears. I'd do it ! __________________ 1968 C10 307 3spd Long Fleet ------ http://67-72chevytrucks.com/vboard/s...d.php?t=201103 1970 C10 305 Super T10 Long Fleet --- http://67-72chevytrucks.com/vboard/s...d.php?t=202285 1971 C20 383 TH350 Dana Posi ----- http://67-72chevytrucks.com/vboard/s...d.php?t=206894 2001 GMC Sierra 1500 C3 6.0

04-10-2009, 09:06 PM	#3
BCOWANWHEELS Registered User Join Date: Nov 2006 Location: KINGSPORT,TN. Posts: 3,035	Re: 3.07 gears 3 speed with a 292? i,d hunt a sm465, 4 speed trany personally that way you still have a low enough 1st gear to pull a load on takeoff . where it will kill you is backing up and pulling out and if your on a incline it will kill your clutch. been a 3 on the tree man all my life and been there done that. __________________ I BELIEVE IN JOHN 3:16

04-10-2009, 10:02 PM	#4
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	Re: 3.07 gears 3 speed with a 292? the 4 speeds came with a 3.07, so i don't see where this would be any different as far as clutch wear. Do it. If a 292 can't handle an empty truck witha freeway gear, then it needs pitched.

04-11-2009, 04:47 PM	#5
special-K Special Order Join Date: Nov 2004 Location: Mt Airy, MD Posts: 85,852	Re: 3.07 gears 3 speed with a 292? Sounds like a good plan.I just don`t like 3spds.As said,1st/reverse is so high you get chatter on hills and with loads when starting off.You can find a granny 4spd and slap it in easy and cheap at some point. __________________ "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 ~

04-11-2009, 05:48 PM	#6
BCOWANWHEELS Registered User Join Date: Nov 2006 Location: KINGSPORT,TN. Posts: 3,035	Re: 3.07 gears 3 speed with a 292? 4 speed tranys have a much lower first & reverse and i,ve never seen one come factory with a 3.08 gear __________________ I BELIEVE IN JOHN 3:16

04-25-2009, 11:43 AM	#7
Brad Out of the carpool lane. Join Date: Jan 2000 Location: Clark Co, WA Posts: 5,673	Re: 3.07 gears 3 speed with a 292? I realize this may be apple & oranges, but fwiw I put 3.07 behind a 250 in my old '67 and while it did great at cruising speeds and above, I had to use alot of clutch at stop signs to get it up and going. __________________ 1968 C-10 SWB, 5.7 Vortec/700R4/3.73 posi, Torch Red 1968 Camaro, 250/Powerglide, all original (No, I'm not gonna drop a 350 in it!...Jeez!) 2000 Honda VFR in the faster yellow! 2008 Husqvarna TE-610 1967 C-10 SWB 'Six Appeal'-Gone but not forgotten...

04-25-2009, 12:21 PM	#8
Shaky Six in a row makes it go... Join Date: Mar 2009 Location: Vacationland: Maine Posts: 1,346	Re: 3.07 gears 3 speed with a 292? We put 3.07 gears in my buddy's '67 C10 with a 250 and 3/tree. Drove it to Alaska. No problem. Heavy load might be tough on the clutch though.

04-25-2009, 01:06 PM	#9
54blackhornet Registered User Join Date: Jul 2008 Location: Eastern Oregon Posts: 2,386	Re: 3.07 gears 3 speed with a 292? I have a 68 GMC custom 1500, it was original with a 250 3 on tree. GMC's have no spid so I can't tell what rearend I have, It now has a 292 30 over in it, you have to slip it pretty good to get it going but boy does it have torque. Any suggestions on how to determine what gear I have

04-25-2009, 01:58 PM	#10
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	Re: 3.07 gears 3 speed with a 292? pop the cover off and count the teeth. The oil os probably 20+ years old anyways and no longer doing the job it was designed to do. And not all GMC trucks were SPID-less.

04-25-2009, 08:51 PM	#13
Tx Firefighter Watch out for your cornhole ! Join Date: Jun 2003 Location: Azle, Texas Posts: 14,162	Re: 3.07 gears 3 speed with a 292? In my 72, I used to run a tired 292, 3 speed and 3.08 gears. No complaint ever. Even my tired 292 never dissapointed me. __________________ I'm on the Instagram- @Gearhead_Kevin

04-25-2009, 09:24 PM	#14
vasquezmrysvll "the other guy" Join Date: Oct 2008 Location: Olivehurst California 95961 Posts: 901	Re: 3.07 gears 3 speed with a 292? sorry to hijack.....but, i have a 67 shorty with rebuilt 250,hei,powerglide and 3.07 rear. im not planning on hauling loads,just cruisin. will this thing get out of its own way? i drove it on the property, never fast enough to get in to high. again sorry for the hijack. __________________ God Said,"Building A 10 Second Import Is Like Coming Out Of The Closet, In The End Ur Still....."EXPLETIVE"

04-26-2009, 10:13 AM	#17
vasquezmrysvll "the other guy" Join Date: Oct 2008 Location: Olivehurst California 95961 Posts: 901	Re: 3.07 gears 3 speed with a 292? i may do that. as for not getting first, the column is from a th350 truck. now i geuss i need to look for a radiator with a cooler. my glide is air cooled __________________ God Said,"Building A 10 Second Import Is Like Coming Out Of The Closet, In The End Ur Still....."EXPLETIVE"



Register or Log In To remove these advertisements.

Register or Log In To remove these advertisements.