rear end question - The 1947 - Present Chevrolet & GMC Truck Message Board Network

ironhead342001 · 07-31-2009, 07:51 PM

I have a 1970 C-30, 292, 4 speed, and a very low geared rear end. She tops out about 55 mph. What are my options for gaining more speed? 5 speed tranny? If I change gears in my rear end will I lose hauling capacity? My Dad said he heard of an outfit you can bolt on the back of the tranny to do this, any one heard of any thing like that?

mclairmo · 07-31-2009, 07:56 PM

Your dad is thinking of Gear Vendors overdrive units.

ironhead342001 · 07-31-2009, 08:17 PM

your right mcclair, those babies run around $3000, gotta be a cheaper solution.

chevy_mike · 07-31-2009, 08:39 PM

Basically you have 3 options,

1. Gear Vendors unit or similar $$$$

2. Overdrive tranny, manual or auto $$$

3. Replace gears or whole axle with better ratio $$

Yep, that's about it. Good luck. BTW a good condition 292 straight 6 is a torque monster so gears won't be as much of an issue in loss tow capacity.

ironhead342001 · 07-31-2009, 09:05 PM

Thanks Mike, this little 292 runs great. The guy had it rebuilt a year before he parked it.

Longhorn Man · 07-31-2009, 09:55 PM

technicly, it will reduce it's hauling, and pulling ability acording to GM's dated documents.

07-31-2009, 07:51 PM	#1
ironhead342001 Registered User Join Date: May 2009 Location: id Posts: 23	rear end question I have a 1970 C-30, 292, 4 speed, and a very low geared rear end. She tops out about 55 mph. What are my options for gaining more speed? 5 speed tranny? If I change gears in my rear end will I lose hauling capacity? My Dad said he heard of an outfit you can bolt on the back of the tranny to do this, any one heard of any thing like that? __________________ 67 C50 dump truck 69 C10 LWB 70 C30 72 K5 Blazer

07-31-2009, 07:56 PM	#2
mclairmo Registered User Join Date: Jan 2006 Location: Take Off Posts: 1,908	Re: rear end question Your dad is thinking of Gear Vendors overdrive units.

07-31-2009, 08:17 PM	#3
ironhead342001 Registered User Join Date: May 2009 Location: id Posts: 23	Re: rear end question your right mcclair, those babies run around $3000, gotta be a cheaper solution. __________________ 67 C50 dump truck 69 C10 LWB 70 C30 72 K5 Blazer

07-31-2009, 08:39 PM	#4
chevy_mike Never Ending Projects Join Date: Jul 2006 Location: San Diego, CA Posts: 3,836	Re: rear end question Basically you have 3 options, 1. Gear Vendors unit or similar $$$$ 2. Overdrive tranny, manual or auto $$$ 3. Replace gears or whole axle with better ratio $$ Yep, that's about it. Good luck. BTW a good condition 292 straight 6 is a torque monster so gears won't be as much of an issue in loss tow capacity. __________________ . 1965 C10 Panel, Tiki Express http://www.67-72chevytrucks.com/vboa...d.php?t=506580 SOLD 1968 Chevy C10, Long, Fleetside, Hot Rod Hauler http://67-72chevytrucks.com/vboard/s...d.php?t=313233 SOLD 1965 Chevy C10, Long, Fleetside, Hot Rod C10 http://67-72chevytrucks.com/vboard/s...d.php?t=415702 SOLD We were given two ears and one mouth for a reason... listen twice as much and speak half as often...

07-31-2009, 09:05 PM	#5
ironhead342001 Registered User Join Date: May 2009 Location: id Posts: 23	Re: rear end question Thanks Mike, this little 292 runs great. The guy had it rebuilt a year before he parked it. __________________ 67 C50 dump truck 69 C10 LWB 70 C30 72 K5 Blazer

07-31-2009, 09:55 PM	#6
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,690	Re: rear end question technicly, it will reduce it's hauling, and pulling ability acording to GM's dated documents.



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