Transmission/Odometer Question - The 1947 - Present Chevrolet & GMC Truck Message Board Network

CHEVY_BOI93 · 08-03-2011, 12:15 AM

I have 1970 SWB. But the odometer/speedometer does not work. i know its not the gauge panel because i took a look where the cable that connects to the transmission and gears in there. and it doesn't spin. everything appears to be in there well. Any help/suggestions.

Keep in mind i have a 400TTH Tanssmission SB 350 Engine. the axle was custom made to fit the chevy transmission and the Ford 9 inch differential.
Please help

Wrenchbender Ret · 08-03-2011, 03:57 PM

Raise the rear of the truck. Remove the speedo cable from the trans. With the trans. in neatral put a tiny srewdriver in the hole in the gear. Turn the driveshaft & see if the screwdriver turns. If not remove the bolt holding the gear holder & pull itb from the trans. Inspect the gear & the gear inside the trans. If one or both are stripped they will need to be replaced. It posible the inner gear came loose on the shaft & moved away. You have to pull the drive shaft & rear houseing to get to the inner gear.

CHEVY_BOI93 · 08-03-2011, 11:53 PM

i really appreciate the help.....but the last part that you said is a bit confusing. if you could clarify that for me please. I mean what do i do when i pull out the drive shaft what is it exactly that im looking for and or replacing.

thanks

08-03-2011, 12:15 AM	#1
CHEVY_BOI93 Registered User Join Date: Jun 2011 Location: Denver, CO Posts: 61	Transmission/Odometer Question I have 1970 SWB. But the odometer/speedometer does not work. i know its not the gauge panel because i took a look where the cable that connects to the transmission and gears in there. and it doesn't spin. everything appears to be in there well. Any help/suggestions. Keep in mind i have a 400TTH Tanssmission SB 350 Engine. the axle was custom made to fit the chevy transmission and the Ford 9 inch differential. Please help

08-03-2011, 03:57 PM	#2
Wrenchbender Ret Registered User Join Date: Oct 2005 Location: Overland Park, Ks. Posts: 5,229	Re: Transmission/Odometer Question Raise the rear of the truck. Remove the speedo cable from the trans. With the trans. in neatral put a tiny srewdriver in the hole in the gear. Turn the driveshaft & see if the screwdriver turns. If not remove the bolt holding the gear holder & pull itb from the trans. Inspect the gear & the gear inside the trans. If one or both are stripped they will need to be replaced. It posible the inner gear came loose on the shaft & moved away. You have to pull the drive shaft & rear houseing to get to the inner gear.

08-03-2011, 11:53 PM	#3
CHEVY_BOI93 Registered User Join Date: Jun 2011 Location: Denver, CO Posts: 61	Re: Transmission/Odometer Question i really appreciate the help.....but the last part that you said is a bit confusing. if you could clarify that for me please. I mean what do i do when i pull out the drive shaft what is it exactly that im looking for and or replacing. thanks



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