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Dills79

Junior Member
Joined
Jul 1, 2020
Posts
6
Reaction score
7
Location
Clovis Ca.
First Name
Denver
Truck Year
1979
Truck Model
K15
Engine Size
350
Thanks for the comments. We’ve got the truck torn down and getting ready to start putting it back together. Trying to figure out what gear ratio it is. The stamp on the passenger side axel tube is
PH 145W92 W (I think). It also has GM83 on the drivers side flange. Any help is appreciated.
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Dills79

Junior Member
Joined
Jul 1, 2020
Posts
6
Reaction score
7
Location
Clovis Ca.
First Name
Denver
Truck Year
1979
Truck Model
K15
Engine Size
350
Welcome. Get the mechanicals in order to make it reliable, then if it has A/C get it working. You're gonna need it in Clovis.

Fat Jack's was one of my favorite places to go when visiting Fresno/Clovis area.
Thanks! Fat Jacks actually just closed out of no where. Very sad, it was a great place.


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ali_c20

Full Access Member
Joined
Sep 20, 2016
Posts
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Location
Austria
First Name
Alexander
Truck Year
1974, 1979
Truck Model
C20, K5
Engine Size
350, 350
Welcome from Austria!
 

Craig 85

Full Access Member
Joined
Jan 25, 2017
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Location
Nashville, TN
First Name
Craig
Truck Year
1985
Truck Model
K30 SRW
Engine Size
454/TH-400/NP205
Trying to figure out what gear ratio it is.

You can't always rely on the tube stampings. The gears may have been changed over the years. If you truck was like my '79 K15 the gears are probably 3.07/3.08's.

The easiest way is to pull the diff cover off and read the ring gear. It's stamped on it like the photo below. Here you see the GM part number 3862526, next is the gear ratio "10 41". The "3 70" here is the date of manufacture. This one is for a 70 Chevelle. 10-41 is a 4.10 gear ratio, 41 divided by 10= 4.10. 11-41 would be 3.73, etc.

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Bextreme04

Full Access Member
Joined
May 13, 2019
Posts
4,135
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4,984
Location
Oregon
First Name
Eric
Truck Year
1980
Truck Model
K25
Engine Size
350-4bbl
If it had the SPID label in the glovebox or on the fenderwell you can post a picture of that and we can help you out from there as well. It won't tell you for sure what is in there now, but it will tell you what it originally had from the factory.
 

oldretiredafguy

Full Access Member
Joined
Apr 20, 2020
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1,412
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Location
N. Texas
First Name
Mike
Truck Year
1988, 1988, 1991, 1983
Truck Model
GMC V-Jimmy, GMC Suburban 4WD, GMC Suburban 4WD, GMC-2500 CrewCab
Engine Size
350, 350, 350, 350
Welcome from N. Texas.

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Good looking truck. I'm sure the young man in the photo is already a happy camper, will be ecstatic once he's rolling down the road. Just make sure it's got a center seat belt for the young ladies, assuming he's as intelligent as the photo indicates, and wants a bench seat!
 

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