69 Custom/10 1/2 Ton rearends??? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

69C-owner · 12-22-2011, 01:45 AM

What was available off the assembly line, I know there was nothing but drums on the rear so there is no question of brakes but gears, 10 bolt, 12 bolt, dana? Posi?? Unload the knowledge guys
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69Beauty · 12-22-2011, 02:02 AM

Dont know about anyone elses but my 69 custom/10 1/2 ton has a 12 bolt with 3.73 gears with a factory posi in it.

bobs409 · 12-22-2011, 07:35 AM

My 69 C/10 short step has it's original 12 bolt 3.73 non posi still in it.

Longhorn Man · 12-22-2011, 08:15 AM

just about every C/10 ended up with a 12 bolt in it. A handfull ended up with a Dana, more GMCs than Chevy trucks did though... but still a rare find (and I hate useing that word)
As far as gearing, they came with 4.10, 3.73, and 3.07. They were all standard with certian engine/tanny options.
General rule of thumb without breaking out my books...
3 speed on the column got 3.73.
4 speeds generally got 3.07 (possibly not the case on inlines, can't quite remember)
Anything with a factory overdrive (rare and weak unit, only on 250 and 283/307 motors) got the 4.10 (possibly 4.11)
small block with auto got a 3.07
I *think* big block with a 3 speed got 3.73... they only built a few. I know 3,07 came with the automatic with big block.

This is off my memory... but I think it is pretty close. A few years worked things a little odd, but these are the generic later year guidlines.
Also, there was then optional gearing. The same nubers as above, but for example if you wanted a small block with a 3.73 and an automatic...

There was talk a few years ago of some GMC trucks with 3.54 gearsets in a dana rear. I have never seen documentation of these in factory lit... but it seems they made a few. Consider this the exception, not the rule. If memory serves, they were in inline powered trucks.

12-22-2011, 01:45 AM	#1
69C-owner Registered User Join Date: Dec 2010 Location: Apison Tn Posts: 490	69 Custom/10 1/2 Ton rearends??? What was available off the assembly line, I know there was nothing but drums on the rear so there is no question of brakes but gears, 10 bolt, 12 bolt, dana? Posi?? Unload the knowledge guys Posted via Mobile Device __________________ http://67-72chevytrucks.com/vboard/s...d.php?t=43855069 LWB Fleet 1994 Buick Roadmaster 1994 GMC Sonoma

12-22-2011, 02:02 AM	#2
69Beauty Registered User Join Date: Aug 2010 Location: North Dakota Posts: 279	Re: 69 Custom/10 1/2 Ton rearends??? Dont know about anyone elses but my 69 custom/10 1/2 ton has a 12 bolt with 3.73 gears with a factory posi in it. __________________ 1969 C-10 LWB 388 SBC Vortec Heads 10:1 Lunati 60103 cam Weiand intake Quadrajet Carb 12 Bolt 3:73 posi 700r4 Hedman Headers 1998 Dodge Ram 1500 Reg. Cab Long Box 4X4 5.9L 183k miles 1956 Ford F-100 Longbed with Original 272 and 3OTT 1995 C1500 ECSB 6.5 Diesel 4l80e (Camper puller) 1997 Dodge 3/4 ECLB V10 (MPG machine)

12-22-2011, 07:35 AM	#3
bobs409 1969 Custom 30 wrecker Join Date: Sep 2001 Location: Pottsville, Pa Posts: 2,611	Re: 69 Custom/10 1/2 Ton rearends??? My 69 C/10 short step has it's original 12 bolt 3.73 non posi still in it. __________________ Bob 63 Impala 283/PG/3.36 (under restoration) 66 Impala 327/PG/3.36 66 Chevelle SS 409/M22/3.55 69 Chevelle 307/PG/3.08 (future restoration) 69 C10 short stepside 454/TH350/3.73 69 Custom 30 tow truck 350/4 spd/4.10 (resto done, CRUISIN TIME!) 71 Cheyenne 20 fleetside 350/4 spd/4.10 71 Chevelle 6/PG/3.08 72 Chevelle 454/M21/4.10

12-22-2011, 08:15 AM	#4
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,690	Re: 69 Custom/10 1/2 Ton rearends??? just about every C/10 ended up with a 12 bolt in it. A handfull ended up with a Dana, more GMCs than Chevy trucks did though... but still a rare find (and I hate useing that word) As far as gearing, they came with 4.10, 3.73, and 3.07. They were all standard with certian engine/tanny options. General rule of thumb without breaking out my books... 3 speed on the column got 3.73. 4 speeds generally got 3.07 (possibly not the case on inlines, can't quite remember) Anything with a factory overdrive (rare and weak unit, only on 250 and 283/307 motors) got the 4.10 (possibly 4.11) small block with auto got a 3.07 I think big block with a 3 speed got 3.73... they only built a few. I know 3,07 came with the automatic with big block. This is off my memory... but I think it is pretty close. A few years worked things a little odd, but these are the generic later year guidlines. Also, there was then optional gearing. The same nubers as above, but for example if you wanted a small block with a 3.73 and an automatic... There was talk a few years ago of some GMC trucks with 3.54 gearsets in a dana rear. I have never seen documentation of these in factory lit... but it seems they made a few. Consider this the exception, not the rule. If memory serves, they were in inline powered trucks.



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