AL WTB Stewart Warner speedo reducer gear for 402/TH400 - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**JQ-72** · 09-06-2019, 02:12 PM

Looking for a speedometer reducer for a 1/2 truck with big block, TH400 and 3.08 rear end. I'd like to get a gear with 42 teeth also if someone has one. Thanks.

*randy500* · 09-06-2019, 02:24 PM

I think 1.3 is an increaser.

Here is a link for calculating which gears are needed for a TH400 without the increaser adapter.
https://www.tciauto.com/speedometer-gear-calculator

**JQ-72** · 09-06-2019, 03:42 PM

Whatever it’s called, I need what is pictured.

**JQ-72** · 09-25-2019, 03:21 PM

ttt

*randy500* · 09-25-2019, 04:09 PM

I have the 1.30 adapter, $70 shipped. I dont have the 42 tooth gear but its about $10 on amazon
https://www.amazon.com/Speedometer-G.../dp/B00P8BKSGC

09-06-2019, 02:12 PM	#1
JQ-72 Senior Member Join Date: Feb 2001 Location: Killen, Alabama USA Posts: 3,632	WTB Stewart Warner speedo reducer gear for 402/TH400 Looking for a speedometer reducer for a 1/2 truck with big block, TH400 and 3.08 rear end. I'd like to get a gear with 42 teeth also if someone has one. Thanks. Attached Images __________________ 72 Cheyenne Super swb. Factory 402/400,tach,posi,AM/FM, A/C. Adding cruise, 8-track 72 Cheyenne Super swb. 350/350 A/C, bucket seats 72 Cheyenne swb. Factory 402/400, tilt, posi, A/C 72 Cheyenne Super K-10. 350/4 spd., posi. 72 Suburban 350/350 tilt, tach, AM/FM, A/C, luggage rack 72 GMC Sierra lwb. 350/350, A/C. medium green/olive interior

09-06-2019, 02:24 PM	#2
randy500 Account Suspended Join Date: Jul 2016 Location: Tacoma, WA Posts: 6,873	Re: WTB Stewart Warner speedo reducer gear for 402/TH400 I think 1.3 is an increaser. Here is a link for calculating which gears are needed for a TH400 without the increaser adapter. https://www.tciauto.com/speedometer-gear-calculator

09-06-2019, 03:42 PM	#3
JQ-72 Senior Member Join Date: Feb 2001 Location: Killen, Alabama USA Posts: 3,632	Re: WTB Stewart Warner speedo reducer gear for 402/TH400 Whatever it’s called, I need what is pictured. __________________ 72 Cheyenne Super swb. Factory 402/400,tach,posi,AM/FM, A/C. Adding cruise, 8-track 72 Cheyenne Super swb. 350/350 A/C, bucket seats 72 Cheyenne swb. Factory 402/400, tilt, posi, A/C 72 Cheyenne Super K-10. 350/4 spd., posi. 72 Suburban 350/350 tilt, tach, AM/FM, A/C, luggage rack 72 GMC Sierra lwb. 350/350, A/C. medium green/olive interior

09-25-2019, 03:21 PM	#4
JQ-72 Senior Member Join Date: Feb 2001 Location: Killen, Alabama USA Posts: 3,632	Re: WTB Stewart Warner speedo reducer gear for 402/TH400 ttt __________________ 72 Cheyenne Super swb. Factory 402/400,tach,posi,AM/FM, A/C. Adding cruise, 8-track 72 Cheyenne Super swb. 350/350 A/C, bucket seats 72 Cheyenne swb. Factory 402/400, tilt, posi, A/C 72 Cheyenne Super K-10. 350/4 spd., posi. 72 Suburban 350/350 tilt, tach, AM/FM, A/C, luggage rack 72 GMC Sierra lwb. 350/350, A/C. medium green/olive interior

09-25-2019, 04:09 PM	#5
randy500 Account Suspended Join Date: Jul 2016 Location: Tacoma, WA Posts: 6,873	Re: WTB Stewart Warner speedo reducer gear for 402/TH400 I have the 1.30 adapter, $70 shipped. I dont have the 42 tooth gear but its about $10 on amazon https://www.amazon.com/Speedometer-G.../dp/B00P8BKSGC Attached Images Last edited by randy500; 09-25-2019 at 04:18 PM.

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