Correct name for a "3 on the tree" - The 1947 - Present Chevrolet & GMC Truck Message Board Network

dznucks · 11-08-2007, 03:27 PM

What is the correct name for the three speed trannies that came in the 67-72 trucks. My truck is a 69 the originally had a straight 6.

does anyone know the size of the final drive gear?

grancuda · 11-08-2007, 03:58 PM

Three speed on the column is the correct name for it I believe.

I am curious of the rear gear ratio also. I have been told 3.73:1 and I have been told 4.11:1 but I don't have a tach in the truck so I can't figure it.

My truck is a '72 2wd I6 w/column shift 3 speed Long fleet w/ no options other than leaves out back and the gauge package. Any ideas on the factory gear ratio?

67shortie · 11-08-2007, 04:20 PM

Quote:

Originally Posted by grancuda

My truck is a '72 2wd I6 w/column shift 3 speed Long fleet w/ no options other than leaves out back and the gauge package. Any ideas on the factory gear ratio?

My truck was born a 71 with the standard L6 and 3 on the column too, the stock rear end came with 3.73's in this truck. Someone will chime in I am sure with more accurate info.

Also, call it what you want but I always refered to the 3 speed on the column as '3 on the tree' too. It probably is suppose to be standard on the column or something like that.

1969k10stepside · 11-08-2007, 04:26 PM

I believe the stock 3spd manuals were Saginaw three speeds,but could be wrong...

northerngmc · 11-08-2007, 04:45 PM

What do you mean by final drive?

If you are wondering about 3rd (high) gear on the 3 speed. It is a 1:1 ratio.

**68350** · 11-08-2007, 05:11 PM

3.73 i believe were STANDARD on all manual transmission pickups, blazer, burbs. auto's should have been 3.08 or 3.54 depending on 1/2 3/4 1 ton. hope this helps

67_C-30 · 11-08-2007, 06:47 PM

Were 3.73's standard on V8 truck also?

1969k10stepside · 11-08-2007, 06:49 PM

If they had manuals..all my 2wds with 350/TH350s had 3.07s or 3.08s unless they had been ordered otherwise.All my 4wds with 4spds had 3.73s on 1/2 tons...

**oldgold70c10** · 11-08-2007, 06:53 PM

I guess 3 on the tree works. The owners manual says something like conventional H-pattern column shift.
Rear drive ratio seemed to vary with engine and transmission. This is what GM offered in 1970 1/2 tons:
http://www.wkinsler.com/truck/index.htm#Power, other years may vary.

dznucks · 11-09-2007, 06:42 AM

Maybe i should have been alittle clearer. I meant to ask for the manufacturers name and part numbers associated with it.

i thought they were saginaws but i was not sure, i have never heard them called anything but 3 on the tree.

thanks notherngmc that is what i was asking for.

long stroy short i am trying to have a carb tuned to the truck and need to know, or at least act like i know, what i am talking about.
thanks all.

**special-K** · 11-09-2007, 08:49 AM

When you say 3spd that means 3 on the tree to me.I guess column shift 3spd or column shift manual.It`s becoming obvious why we the people dubbed the "3 on the tree" term.Seems to work best.

11-08-2007, 03:27 PM	#1
dznucks Registered User Join Date: Feb 2006 Location: Smyrna, Ga Posts: 1,647	Correct name for a "3 on the tree" What is the correct name for the three speed trannies that came in the 67-72 trucks. My truck is a 69 the originally had a straight 6. does anyone know the size of the final drive gear?

11-08-2007, 03:58 PM	#2
grancuda Registered User Join Date: Nov 2007 Location: Central OK Posts: 396	Re: Correct name for a "3 on the tree" Three speed on the column is the correct name for it I believe. I am curious of the rear gear ratio also. I have been told 3.73:1 and I have been told 4.11:1 but I don't have a tach in the truck so I can't figure it. My truck is a '72 2wd I6 w/column shift 3 speed Long fleet w/ no options other than leaves out back and the gauge package. Any ideas on the factory gear ratio?

11-08-2007, 04:26 PM	#4
1969k10stepside Registered User Join Date: Mar 2006 Location: USA Posts: 21,019	Re: Correct name for a "3 on the tree" I believe the stock 3spd manuals were Saginaw three speeds,but could be wrong... Last edited by 1969k10stepside; 11-08-2007 at 04:29 PM.

11-08-2007, 04:45 PM	#5
northerngmc Registered User Join Date: Jan 2004 Location: Whitehorse YK Canada Posts: 2,651	Re: Correct name for a "3 on the tree" What do you mean by final drive? If you are wondering about 3rd (high) gear on the 3 speed. It is a 1:1 ratio. __________________ Blaine 59 GMC 9314 a.k.a. Whoopee 68 C20 50th Anniversary a.k.a. The Rat http://www.flickr.com/photos/northerngmc/ http://www.members.tripod.com/P-wee/index_032.htm 1.61803 is one H of a lot better than 3.14159, no really it is!

11-08-2007, 05:11 PM	#6
68350 Senior Member Join Date: Jan 2002 Location: Williston, ND Posts: 2,999	Re: Correct name for a "3 on the tree" 3.73 i believe were STANDARD on all manual transmission pickups, blazer, burbs. auto's should have been 3.08 or 3.54 depending on 1/2 3/4 1 ton. hope this helps __________________ 68 Chevy CST/10, 50th Anniversary, 327/th400, 373 posi, buckets 68 GMC Shortbox Stepside, 402/th400, Tilt, Tach, Bucket Seats, 3.08 Positraction 69 Chevy Camaro SS, 383, 4 speed, positraction 70 Chevy El Camino SS396, Triple Black, 454/th400, Tach 70 Chevy Shortbox Stepside 4x4, 350/th350, Tilt, Tach, Cab Lights, Bumper Guards, Tow Hooks 70 Chevy 3/4 Longbox, 350/auto, 70k, SURVIVOR 71 Chevy Blazer, CST, 350/auto 71 GMC Sierra K2500, 454, 4 speed, 4.10 posi, 37s 71 Custom/30, Open Road, 350/th400, tilt 72 Chevy Shortbox Fleetside, 496 Stroker/th400, Tilt, Tach, Bucket Seats, 3.42 Posi 72 GMC Sierra Grande 2500. 427/th400, tilt, a/c, tool and stowage, buckets/console, 3.54 posi

11-08-2007, 06:47 PM	#7
67_C-30 I have a radical idea! Join Date: Jan 2005 Location: Sweet Home Alabama! Posts: 6,513	Re: Correct name for a "3 on the tree" Were 3.73's standard on V8 truck also? __________________ '67 C-30 Dually Pickup 6.2 Turbo Diesel, NP435 ‘72 C-10 SWB , 350 4bbl, TH350 '69 C-10 SWB , 250 L6, 3 OTT '69 GMC C3500, dump truck, 351 V6, NP435 '84 M1009 CUCV Military Blazer 67 C-30 Turbodiesel build thread http://67-72chevytrucks.com/vboard/s...d.php?t=254096 My trucks http://s226.photobucket.com/albums/d...ediafilter=all Member of the 1-Ton Club!

11-08-2007, 06:49 PM	#8
1969k10stepside Registered User Join Date: Mar 2006 Location: USA Posts: 21,019	Re: Correct name for a "3 on the tree" If they had manuals..all my 2wds with 350/TH350s had 3.07s or 3.08s unless they had been ordered otherwise.All my 4wds with 4spds had 3.73s on 1/2 tons... Last edited by 1969k10stepside; 11-08-2007 at 06:49 PM.

11-08-2007, 06:53 PM	#9
oldgold70c10 Who's got steelies? Join Date: Feb 2006 Location: Morrison, Oklahoma Posts: 1,025	Re: Correct name for a "3 on the tree" I guess 3 on the tree works. The owners manual says something like conventional H-pattern column shift. Rear drive ratio seemed to vary with engine and transmission. This is what GM offered in 1970 1/2 tons: http://www.wkinsler.com/truck/index.htm#Power, other years may vary. __________________ 1969 C10 LWB W/ 250 I6 & 3spd 1970 C10 with '67 small window cab, 68 front end, blue; 305/TH350, 3.08 limited slip rear end, manual brakes, power steering; & 4-wheel drums-My daily driver. 1975 Chevelle Malibu Classic Coupe 350/th350 mint green 1970 C20 Suburban 350/700R4 4.10 gearing green & white 1978 Big 10 Silverado 350/th350, working ac, 2 tone blue-My summer daily driver 1983 GMC 1500 Sierra 305/SM465 2.73 rear end How to add a trip odometer to your 67-72 stock speedometer How to rebuild your Q-Jet My Truck Page My Youtube Channel

11-09-2007, 06:42 AM	#10
dznucks Registered User Join Date: Feb 2006 Location: Smyrna, Ga Posts: 1,647	Re: Correct name for a "3 on the tree" Maybe i should have been alittle clearer. I meant to ask for the manufacturers name and part numbers associated with it. i thought they were saginaws but i was not sure, i have never heard them called anything but 3 on the tree. thanks notherngmc that is what i was asking for. long stroy short i am trying to have a carb tuned to the truck and need to know, or at least act like i know, what i am talking about. thanks all.

11-09-2007, 08:49 AM	#11
special-K Special Order Join Date: Nov 2004 Location: Mt Airy, MD Posts: 85,851	Re: Correct name for a "3 on the tree" When you say 3spd that means 3 on the tree to me.I guess column shift 3spd or column shift manual.It`s becoming obvious why we the people dubbed the "3 on the tree" term.Seems to work best. __________________ "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 ~



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