89 R3500 Part Identification Help

[89square]

Hey everyone, I hope this is the correct forum section to post this question to. My recently acquired 89 R3500 dually has a ton of bells and whistles that I'm not used to, I've owned 1/2 trucks before but nothing quite this massive. While poking around I've figured out what everything is except this thing. It's located under the steering column on the left hand side.

Thanks in advance!

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[yevgenievich]

Maybe brake controller?

 

[89square]

That was actually my only guess. Never had one or operated one before. I did some searching around and couldn't find anything that looked liked this particular unit. This does appear to be in the go-to location for mounting a brake controller switch though. Thanks!

 

[bucket]

Yep, brake controller. It's an older unit, maybe from when the truck was new? The logo is for the Kelsey Hayes brand.

 

[bucket]

https://www.ebay.com/i/323466981772...1%26rvr_ts%3Dedf72d911670ab455fd5a944fffdcded

 

[89square]

Bingo, that's it. Thanks!

 

[Backfoot100]

That's exactly what it is. I have the same thing on my Sub. I have the factory towing package so I just assumed it was part of that.

I'm not sure what else it included but I have the hitch and an oil cooler. I thought it should have a tranny cooler too but mine has what appears to be a standard cooling setup through the radiator for the tranny.

 

[89square]

That's exactly what it is. I have the same thing on my Sub. I have the factory towing package so I just assumed it was part of that.

I'm not sure what else it included but I have the hitch and an oil cooler. I thought it should have a tranny cooler too but mine has what appears to be a standard cooling setup through the radiator for the tranny.

The truck definitely came with a factory tow package, but it looks like the original owner also put a bunch of extra stuff in here as well, still discovering everything ha! They claim the installed a custom 7 leaf spring pack in the rear to increase tow capacity, and it appears to have a Gear Vendors under/overdrive trans installed as well, i'm not sure if that came factory but it appears to be aftermarket. I've only had a few hours each day to dig into it since I picked this thing up on Christmas eve, can't wait to get this leaky water pump replaced to get it on the road! Thanks for the input!

 

[Craig 85]

If it only has 7 leaves in the rear springs, they actually had some leaves removed. Maybe they are a higher rate. My K30 has 8 in the main pack with the auxiliary 9th overload on top.