Speedometer adapter M1028

[mead]

Hello all,
my son is looking for a speedometer adapter for his 1985 M1028.

Right now it has a 10-bolt 1/2 ton rear end, 6 lug axles. Originally it would have been a Dana 60 or 14 bolt full ton rear end with 8 lug axles, or so he says.
I am planning to call Memphis equipment in the morning, but wondered if anyone had a used one for sale.

I wanted to make absolutely sure everyone could see the pictures, so I uploaded them four times.

thanks for any help!

 

[Recovry4x4]

We know what ratio was in the original axles but we don't know what ratio is in the 10 bolts. Type of axle isn't significant but the ratio is.

According to the parts TM, the M1009 was the only model using on of those.

 

[CUCVLOVER]

I pulled this from the cucv wiki, I hope this helps.
M1028
The M1028 is a 1984 K30 pickup with a J code 6.2L diesel, TH400 3 speed automatic, and an NP208 transfer case. It is primarily used as a shelter carrier and therefore has heavier rear suspension and mounts for a communications box to be installed in the bed.

The M1028 has a Dana 60 front axle with limited slip and Corporate 14 bolt rear axle with 4.56 gears, Detroit locker.

 

[mead]

Thanks for the replies. My son thinks the ratio is 3.07:1.
I don't know if the truck originally had a speedometer adapter, but I guess since the rear axle was swapped, it has one now.

 

[Recovry4x4]

That is the gear ratio of the M1009. I searched the part manual (TM9-2320-361-34P) and came up with the GM part number 368026. In the back is a cross reference and that part number came back to NSN is 6680-01-160-5276. I then entered the NSN into Parttarget and came up with this. http://www.parttarget.com/6680-01-1...ption=nsn&originalsearchtext=6680-01-160-5276

Should help you narrow down your search or at least know exactly what you need.

 

[mead]

That is the gear ratio of the M1009. I searched the part manual (TM9-2320-361-34P) and came up with the GM part number 368026. In the back is a cross reference and that part number came back to NSN is 6680-01-160-5276. I then entered the NSN into Parttarget and came up with this. http://www.parttarget.com/6680-01-1...ption=nsn&originalsearchtext=6680-01-160-5276

Should help you narrow down your search or at least know exactly what you need.

Wow. Thanks so much for your work. I have requested a quote from that website and I will post the results.