Speedometer off

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Red Rex

Full Access Member
Joined
Jun 3, 2014
Posts
317
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523
Location
Middle Ga
First Name
Andy
Truck Year
1984
Truck Model
K 1500 4 WD shortbed
Engine Size
350
My speedometer reads 5 mph faster than my gps.

208c transfer case original equipment
Th350 transmission replaced 700r4
3.08 gears original equipment
30 inch tires

I have changed the speedometer with a junkyard part

No adapter on the transfer case. It has a black plastic gear in the housing.

How can I tell what gear in the housing I need and where might I get it or do I need to change the speedometer?
 

C10MixMaster

Full Access Member
Joined
Dec 6, 2016
Posts
756
Reaction score
1,420
Location
Kingman AZ
First Name
Ben
Truck Year
1977
Truck Model
C10 BIG10
Engine Size
ZZ4 350
My speedometer reads 5 mph faster than my gps.

208c transfer case original equipment
Th350 transmission replaced 700r4
3.08 gears original equipment
30 inch tires

I have changed the speedometer with a junkyard part

No adapter on the transfer case. It has a black plastic gear in the housing.

How can I tell what gear in the housing I need and where might I get it or do I need to change the speedometer?



You dont need to change the speedometer. You need to change the gears.
here's a link to a similar post that might help https://www.gmsquarebody.com/threads/np208-speedo-driven-gear-needed.20778/
 

Red Rex

Full Access Member
Joined
Jun 3, 2014
Posts
317
Reaction score
523
Location
Middle Ga
First Name
Andy
Truck Year
1984
Truck Model
K 1500 4 WD shortbed
Engine Size
350
Appreciate the information and post!
 

LateOnTheBrakes

5.3-Swapped 86 CUCV
Joined
Feb 2, 2020
Posts
463
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Location
Virginia
First Name
Joshua
Truck Year
1986
Truck Model
CUCV
Engine Size
5.3
What gears did you end up going with? My truck is a mix of 4.3L V6 and CUCV. I don't know which of the two my transfer case came out of. What I do know is the V6 should have come with 3.73 rear gears and my truck has 3.08 in the back. My speedometer reads about 35mph when I'm going over 50mph.
 

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