Stock rear ratio in 76 BBC C10? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**ScottH** · 08-16-2005, 10:15 AM

Can anyone tell me what the rear end ratio would be in a 1976 C10 equipped with the 454 and limited slip rear options?

thanks!

**Captkaos** · 08-16-2005, 11:33 AM

We would only be guessing. What does the RPO code say in the glovebox?

**ScottH** · 08-16-2005, 11:54 AM

I don't believe there is an RPO code if it is a stock ratio.
Nothing there I could find anyway.

**Captkaos** · 08-16-2005, 12:18 PM

Standard "should" be 3.08:1

The codes would be something like this:
GQ1 REAR AXLE - STANDARD (NON-POSI)
GT4 REAR AXLE - 3.73 RATIO
GT5 REAR AXLE - 4.10 RATIO
GU2 REAR AXLE - 2.73 RATIO
GU4 REAR AXLE - 3.08 RATIO
GU6 REAR AXLE - 3.42 RATIO

**ScottH** · 08-16-2005, 12:29 PM

Thanks!, I'll take a look tonight.

**Captkaos** · 08-16-2005, 12:37 PM

Also, I don't have this info, but there should be a number stamped on the axle tube that can be used to find what ratio was used by the factory.

**ScottH** · 08-16-2005, 12:48 PM

Thanks again Chris. I sent you a pm on a couple of other questions.
I appreciate the help and information.

Scott

08-16-2005, 10:15 AM	#1
ScottH Senior Member Join Date: Sep 2002 Location: Hampstead, NC Posts: 8,190	Stock rear ratio in 76 BBC C10? Can anyone tell me what the rear end ratio would be in a 1976 C10 equipped with the 454 and limited slip rear options? thanks!

08-16-2005, 11:33 AM	#2
Captkaos www.73-87chevytrucks.com Join Date: Dec 1999 Location: Birmingham, AL Posts: 6,935	We would only be guessing. What does the RPO code say in the glovebox? __________________ Chris Lucas 1973 Chevy C-10 1978 GMC Jimmy (2WD) - SOLD 1987 R10 twin turbo LS 1991 R3500 SRW CrewCab 1985 K5 diesel swapped project 1989 K5 2WD conversion w/ Vette susp Project Captkaos Customs 73-87chevytrucks.com

08-16-2005, 12:18 PM	#4
Captkaos www.73-87chevytrucks.com Join Date: Dec 1999 Location: Birmingham, AL Posts: 6,935	Standard "should" be 3.08:1 The codes would be something like this: GQ1 REAR AXLE - STANDARD (NON-POSI) GT4 REAR AXLE - 3.73 RATIO GT5 REAR AXLE - 4.10 RATIO GU2 REAR AXLE - 2.73 RATIO GU4 REAR AXLE - 3.08 RATIO GU6 REAR AXLE - 3.42 RATIO __________________ Chris Lucas 1973 Chevy C-10 1978 GMC Jimmy (2WD) - SOLD 1987 R10 twin turbo LS 1991 R3500 SRW CrewCab 1985 K5 diesel swapped project 1989 K5 2WD conversion w/ Vette susp Project Captkaos Customs 73-87chevytrucks.com

08-16-2005, 12:37 PM	#6
Captkaos www.73-87chevytrucks.com Join Date: Dec 1999 Location: Birmingham, AL Posts: 6,935	Also, I don't have this info, but there should be a number stamped on the axle tube that can be used to find what ratio was used by the factory. __________________ Chris Lucas 1973 Chevy C-10 1978 GMC Jimmy (2WD) - SOLD 1987 R10 twin turbo LS 1991 R3500 SRW CrewCab 1985 K5 diesel swapped project 1989 K5 2WD conversion w/ Vette susp Project Captkaos Customs 73-87chevytrucks.com

08-16-2005, 11:54 AM	#3
ScottH Senior Member Join Date: Sep 2002 Location: Hampstead, NC Posts: 8,190	I don't believe there is an RPO code if it is a stock ratio. Nothing there I could find anyway.

08-16-2005, 12:29 PM	#5
ScottH Senior Member Join Date: Sep 2002 Location: Hampstead, NC Posts: 8,190	Thanks!, I'll take a look tonight.

08-16-2005, 12:48 PM	#7
ScottH Senior Member Join Date: Sep 2002 Location: Hampstead, NC Posts: 8,190	Thanks again Chris. I sent you a pm on a couple of other questions. I appreciate the help and information. Scott



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