Rear swap help - The 1947 - Present Chevrolet & GMC Truck Message Board Network

brad20653 · 07-27-2003, 05:05 PM

i went to get 3:73 gears at store and they asked if i had a 3" carrier or 4" how do i know >???

Tx Firefighter · 07-27-2003, 05:23 PM

You have to know what ratio you have now. The carrier will vary depending on what gears your rear came with stock.

brad20653 · 07-27-2003, 05:34 PM

i have 2.73 or 3.07 something low i know

Tx Firefighter · 07-27-2003, 05:37 PM

It's a 3 series then.

If you're sure...you might check for sure before you plunk down the money for new gears.

brad20653 · 07-27-2003, 05:40 PM

i 43 teeth on big 15 on little

Tx Firefighter · 07-27-2003, 05:45 PM

That works out to 2.87:1

Should be either 2.73 or 3.08 like you said above. Are you sure you didn't miscount?

But, never-the-less, it's a 3 series carrier.

brad20653 · 07-27-2003, 05:48 PM

will i see a big jump in take off ? with 373's i cant even lay wheel lol rebuilt 350 edelbrock 1406 turbo 350 old but shifts hei sccell cap and rotor and plugs and accell super coil

Tx Firefighter · 07-27-2003, 05:55 PM

Huge difference.

All of my trucks have always had 3.73s and they will definitely take off quickly. Burnouts can be accidental. They do get pretty old when driving on the highway though. Overdrive and 3.73 is perfect.

Remember, tire size plays a big part in the equation. I always run 275/60s, which are 28 inches tall. Any shorter tire will make it rev that much more on the highway.

07-27-2003, 05:05 PM	#1
brad20653 Senior Member Join Date: Jul 2003 Location: So. MD Posts: 218	Rear swap help i went to get 3:73 gears at store and they asked if i had a 3" carrier or 4" how do i know >???

07-27-2003, 05:23 PM	#2
Tx Firefighter Watch out for your cornhole ! Join Date: Jun 2003 Location: Azle, Texas Posts: 14,162	You have to know what ratio you have now. The carrier will vary depending on what gears your rear came with stock.

07-27-2003, 05:34 PM	#3
brad20653 Senior Member Join Date: Jul 2003 Location: So. MD Posts: 218	i have 2.73 or 3.07 something low i know

07-27-2003, 05:37 PM	#4
Tx Firefighter Watch out for your cornhole ! Join Date: Jun 2003 Location: Azle, Texas Posts: 14,162	It's a 3 series then. If you're sure...you might check for sure before you plunk down the money for new gears.

07-27-2003, 05:40 PM	#5
brad20653 Senior Member Join Date: Jul 2003 Location: So. MD Posts: 218	i 43 teeth on big 15 on little

07-27-2003, 05:45 PM	#6
Tx Firefighter Watch out for your cornhole ! Join Date: Jun 2003 Location: Azle, Texas Posts: 14,162	That works out to 2.87:1 Should be either 2.73 or 3.08 like you said above. Are you sure you didn't miscount? But, never-the-less, it's a 3 series carrier.

07-27-2003, 05:48 PM	#7
brad20653 Senior Member Join Date: Jul 2003 Location: So. MD Posts: 218	will i see a big jump in take off ? with 373's i cant even lay wheel lol rebuilt 350 edelbrock 1406 turbo 350 old but shifts hei sccell cap and rotor and plugs and accell super coil

07-27-2003, 05:55 PM	#8
Tx Firefighter Watch out for your cornhole ! Join Date: Jun 2003 Location: Azle, Texas Posts: 14,162	Huge difference. All of my trucks have always had 3.73s and they will definitely take off quickly. Burnouts can be accidental. They do get pretty old when driving on the highway though. Overdrive and 3.73 is perfect. Remember, tire size plays a big part in the equation. I always run 275/60s, which are 28 inches tall. Any shorter tire will make it rev that much more on the highway.



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