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: 5,204	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



Register or Log In To remove these advertisements.

Register or Log In To remove these advertisements.