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Durney · 08-26-2002, 07:40 PM

Just a note to all the guys that have helped in the last few weeks in my search for a 67-68 3/4 ton 4X4....thank you for all the e-mails and even the local traders (Mike)!

Its a MINT 67 C20 Chevrolet..... that has already had a frame off resto done in 2000. (so much for me having the fun). But I am still going to think about a new powerplant and switch to an overdrive unit (its got the manual 4-sp in it now).

What were the standard trans options and differential ratios?

thanks again folks...

*Fast68Chevy* · 08-26-2002, 09:30 PM

67 C20, std tranny was Sm326 and 4.57 ratio rear axle

available was 4.10, and 4 speed granny toploader tranny(SM420)

good luck and congrats

**ThreeQuarter** · 08-26-2002, 10:46 PM

You GOTTA show pics now. It's an obligation you have to fill since we helped in your search.

lukecp · 08-26-2002, 10:50 PM

If it is a granny-low 4-spd, it should be a SM420. If you want to keep the 4spd, you could put a Gear Vendors OD behind it. They are indestructable, and will make up for the 4.10 gears you proably have on the highway.

Durney · 08-26-2002, 11:30 PM

Whats the easiest way to ID the two transmissions?
( I assume they are both 4-speeds? )

Is one stronger or easier to find parts for?

I am rethinking the need for a 4L60E as I prefer manuals.

As far as the ratios, I am thinking about just replacing the ring & pinions in the diff's for a more realistic vehicle.

But the GV stuff is nice (if it'll fit between the transfer and carrier bearing)

What were the trim options by the way? (it supposedly has factory AIR but I didnt think that was until 69?)

**ThreeQuarter** · 08-27-2002, 12:03 AM

You could get factory air in '67. Check the options list on the glovebox door for the factory eqipment.

Also check out my '67 C20 on the link in my sig--sounds alot like yours, except for the resto.

Ben

stllookn · 08-27-2002, 01:09 AM

Sounds great...let's see those pics!

Blazer1970 · 08-27-2002, 07:39 AM

The SM326 is a column shifted 3 speed. The granny low 4 speed is the SM420. The 420 is a good strong tranny, some parts are discontinued, but there are a zillion used trannies out there if you need any gears or anything. You probably have an Eaton rear axle, and I think the highest gear ratio available is 3.90.

08-26-2002, 07:40 PM	#1
Durney Registered User Join Date: Jul 2002 Location: Michigan Posts: 158	Found it ! Just a note to all the guys that have helped in the last few weeks in my search for a 67-68 3/4 ton 4X4....thank you for all the e-mails and even the local traders (Mike)! Its a MINT 67 C20 Chevrolet..... that has already had a frame off resto done in 2000. (so much for me having the fun). But I am still going to think about a new powerplant and switch to an overdrive unit (its got the manual 4-sp in it now). What were the standard trans options and differential ratios? thanks again folks...

08-26-2002, 10:46 PM	#3
ThreeQuarter Senior Member Join Date: Jun 2000 Location: Texan in Iowa Posts: 2,523	You GOTTA show pics now. It's an obligation you have to fill since we helped in your search. __________________ Ben '68 Chevy C10 Custom LWB 327/TH400 2nd owner '16 GMC Sierra 1500 SLE Dblcab 4wd 5.3

08-26-2002, 10:50 PM	#4
lukecp Formerly yellow72custom Join Date: May 2001 Location: Austin, TX Posts: 7,531	If it is a granny-low 4-spd, it should be a SM420. If you want to keep the 4spd, you could put a Gear Vendors OD behind it. They are indestructable, and will make up for the 4.10 gears you proably have on the highway. __________________ '72 Chevy C10 Mild 350/TH350/3.07. Ochre/White. Old high school ride. '70 GMC C2500 '62 327 4bbl/SM465/4.56-geared Dana 60. White/White. Project or parts truck. '97 Saturn SL DD. 1.9/5-speed. 40+ highway mpg

08-27-2002, 12:03 AM	#6
ThreeQuarter Senior Member Join Date: Jun 2000 Location: Texan in Iowa Posts: 2,523	You could get factory air in '67. Check the options list on the glovebox door for the factory eqipment. Also check out my '67 C20 on the link in my sig--sounds alot like yours, except for the resto. Ben __________________ Ben '68 Chevy C10 Custom LWB 327/TH400 2nd owner '16 GMC Sierra 1500 SLE Dblcab 4wd 5.3

08-27-2002, 01:09 AM	#7
stllookn Saving 1 truck at a time! Join Date: Aug 2001 Location: Kent, WA Posts: 6,465	Sounds great...let's see those pics! __________________ '68 C20 Longhorn 50th Anniversary 400/TH400 '68 C20 Longhorn 50th Anniversary 468/TH400w/buckets '72 C20 Halfhorn (Longhorn w/o cab and front clip) '69 Flxible Cruiser (look up ugly in the dictionary)

08-26-2002, 09:30 PM	#2
Fast68Chevy Account Suspended Join Date: May 2000 Location: IL Posts: 0	67 C20, std tranny was Sm326 and 4.57 ratio rear axle available was 4.10, and 4 speed granny toploader tranny(SM420) good luck and congrats

08-26-2002, 11:30 PM	#5
Durney Registered User Join Date: Jul 2002 Location: Michigan Posts: 158	Whats the easiest way to ID the two transmissions? ( I assume they are both 4-speeds? ) Is one stronger or easier to find parts for? I am rethinking the need for a 4L60E as I prefer manuals. As far as the ratios, I am thinking about just replacing the ring & pinions in the diff's for a more realistic vehicle. But the GV stuff is nice (if it'll fit between the transfer and carrier bearing) What were the trim options by the way? (it supposedly has factory AIR but I didnt think that was until 69?)

08-27-2002, 07:39 AM	#8
Blazer1970 Registered User Join Date: Dec 1999 Location: Old Mission, MI, USA Posts: 2,507	The SM326 is a column shifted 3 speed. The granny low 4 speed is the SM420. The 420 is a good strong tranny, some parts are discontinued, but there are a zillion used trannies out there if you need any gears or anything. You probably have an Eaton rear axle, and I think the highest gear ratio available is 3.90. __________________ Tim



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