Rear gearing question... - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**JIMs70GMC** · 08-26-2004, 08:51 PM

What gears could have possibly been in a 1970 C20 camper special w/ a 350 and dana 60 rear(leaf sprung)? Not sure if the turbo 350 is stock.

**kwmech** · 08-26-2004, 09:11 PM

More than likely 4.10s with the small block. There should be tag on the rear diff cover under one of the cover bolts that may say 41-10.

**JIMs70GMC** · 08-26-2004, 09:15 PM

That's what I was thinking, I'm fairly certain it would have been 3.54s if it had a BBC.

Anybody know what the distance between the rear leaf springs is on a C20, center to center?

1969 GMC · 08-26-2004, 09:15 PM

Agreed. It might have the optional 4.56, but I believe the dana 60 in our trucks only had 3 ratios available, with the BB only 3.54 being third, and 4.10 sounds correct.

**JIMs70GMC** · 08-30-2004, 03:12 PM

Ttt

**CPNE** · 08-30-2004, 03:54 PM

It's a high probability it's a 4:10 rear. If you're looking to swap a 2wd leaf rear under a 4wd truck you'll have to relocate the spring perches as the 2wd perches are futher apart thann the 4wd ones

**JIMs70GMC** · 08-31-2004, 05:43 AM

That's what I wanted to know. Thanks Jeff!

08-26-2004, 08:51 PM	#1
JIMs70GMC user # 2756 Join Date: Jun 2001 Location: Chesapeake, Virginia Posts: 4,612	Rear gearing question... What gears could have possibly been in a 1970 C20 camper special w/ a 350 and dana 60 rear(leaf sprung)? Not sure if the turbo 350 is stock. __________________ 1970 K25, 8' stepside bed 350/465/205 44 up front, 60 in the rear 4.10s rolling on 33" Dunlop MTs 1986 K5, 350/465/208 Dana 60/14 bolt from a cucv 36" Super Swampers TSL/SX 1983 K20 w/ CUCV axles, 350/700R4/208 sitting on 37" Goodyears 1986 M1031 6.2 diesel, TH400/NP205 locker in the rear and a LS in the front, all stock for now..... 1986 K30, 350/400/205 dana 60 and 14 bolt. I kept the drivetrain. Body/bad and chassis are gone. 1981 K30, 350/465/205 dana 60 and dually 14 bolt. Has a G80, and a flat bed. Going to replace the flat bed. 1985 K20, 350/400/208 10 bolt and SF 14 bolt. I wonder where I can find some 1 tons. Hmmmmm

08-26-2004, 09:15 PM	#3
JIMs70GMC user # 2756 Join Date: Jun 2001 Location: Chesapeake, Virginia Posts: 4,612	That's what I was thinking, I'm fairly certain it would have been 3.54s if it had a BBC. Anybody know what the distance between the rear leaf springs is on a C20, center to center? __________________ 1970 K25, 8' stepside bed 350/465/205 44 up front, 60 in the rear 4.10s rolling on 33" Dunlop MTs 1986 K5, 350/465/208 Dana 60/14 bolt from a cucv 36" Super Swampers TSL/SX 1983 K20 w/ CUCV axles, 350/700R4/208 sitting on 37" Goodyears 1986 M1031 6.2 diesel, TH400/NP205 locker in the rear and a LS in the front, all stock for now..... 1986 K30, 350/400/205 dana 60 and 14 bolt. I kept the drivetrain. Body/bad and chassis are gone. 1981 K30, 350/465/205 dana 60 and dually 14 bolt. Has a G80, and a flat bed. Going to replace the flat bed. 1985 K20, 350/400/208 10 bolt and SF 14 bolt. I wonder where I can find some 1 tons. Hmmmmm

08-26-2004, 09:15 PM	#4
1969 GMC Registered User Join Date: Feb 2003 Location: The Rubber City Posts: 5,498	Agreed. It might have the optional 4.56, but I believe the dana 60 in our trucks only had 3 ratios available, with the BB only 3.54 being third, and 4.10 sounds correct. __________________ 1969 GMC K2500 1996 Honda Accord 2007 Kawasaki KLR 650

08-30-2004, 03:12 PM	#5
JIMs70GMC user # 2756 Join Date: Jun 2001 Location: Chesapeake, Virginia Posts: 4,612	Ttt __________________ 1970 K25, 8' stepside bed 350/465/205 44 up front, 60 in the rear 4.10s rolling on 33" Dunlop MTs 1986 K5, 350/465/208 Dana 60/14 bolt from a cucv 36" Super Swampers TSL/SX 1983 K20 w/ CUCV axles, 350/700R4/208 sitting on 37" Goodyears 1986 M1031 6.2 diesel, TH400/NP205 locker in the rear and a LS in the front, all stock for now..... 1986 K30, 350/400/205 dana 60 and 14 bolt. I kept the drivetrain. Body/bad and chassis are gone. 1981 K30, 350/465/205 dana 60 and dually 14 bolt. Has a G80, and a flat bed. Going to replace the flat bed. 1985 K20, 350/400/208 10 bolt and SF 14 bolt. I wonder where I can find some 1 tons. Hmmmmm

08-30-2004, 03:54 PM	#6
CPNE Resident Curmudgeon Join Date: Dec 1999 Location: NH Posts: 6,664	It's a high probability it's a 4:10 rear. If you're looking to swap a 2wd leaf rear under a 4wd truck you'll have to relocate the spring perches as the 2wd perches are futher apart thann the 4wd ones __________________ Currently on or near the homestead: 67 Chevy SWB 2WD stepside 350/3 on tree (Pat's) 67 GMC SWB 2WD Fleet 402/auto (Brian's under construction) 67 Chevy 3/4 ton 2WD 402/auto (Business Hauler) 67 Chevy 1 ton dually 2WD 396/4 speed (Former business hauler, Needs TLC) 68 Chevy 1/2 ton Suburban 2WD 250 six/3 on tree (Brian's Needs TLC) 70 Chevy 3/4 ton 4WD 350/4 speed (Pat's - Disguised as a 68 GMC) 71 Chevy SWB stepside (Crushed by tree - parts donor) 72 Chevy 3/4 ton 4WD (Parts donor) 72 Chevy 3/4 ton 4WD Suburban (Parts Donor) 72 GMC 3/4 ton 4WD 292 six/4 speed (Mine - Disguised as a 67 GMC) 81 GMC 4WD Dually Dump Body 350/4 speed (Business Hauler) 82 Camaro Z/28 355/Super T-10 (Pat's toy) 93 Caprice 9C1 (Brian's Cop Car) 02 Toyota Camry (Reliable but a souless steel and plastic hulk) 2011 2SS RS Camaro M6 Factory Hurst Shifter Maybe I need to sell some of this crap Yet another Bozo with a sawz-all

08-26-2004, 09:11 PM	#2
kwmech Senior Member Join Date: Mar 2003 Location: Colfax-California Posts: 8,499	More than likely 4.10s with the small block. There should be tag on the rear diff cover under one of the cover bolts that may say 41-10.

08-31-2004, 05:43 AM	#7
JIMs70GMC user # 2756 Join Date: Jun 2001 Location: Chesapeake, Virginia Posts: 4,612	That's what I wanted to know. Thanks Jeff! __________________ 1970 K25, 8' stepside bed 350/465/205 44 up front, 60 in the rear 4.10s rolling on 33" Dunlop MTs 1986 K5, 350/465/208 Dana 60/14 bolt from a cucv 36" Super Swampers TSL/SX 1983 K20 w/ CUCV axles, 350/700R4/208 sitting on 37" Goodyears 1986 M1031 6.2 diesel, TH400/NP205 locker in the rear and a LS in the front, all stock for now..... 1986 K30, 350/400/205 dana 60 and 14 bolt. I kept the drivetrain. Body/bad and chassis are gone. 1981 K30, 350/465/205 dana 60 and dually 14 bolt. Has a G80, and a flat bed. Going to replace the flat bed. 1985 K20, 350/400/208 10 bolt and SF 14 bolt. I wonder where I can find some 1 tons. Hmmmmm



Register or Log In To remove these advertisements.

Register or Log In To remove these advertisements.