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1991 Jimmy K5 - Need some ideas

datmony

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Hope you are all well. I just picked up a new to me 1991 K5. It is in good shape overall but I am going to be updating a few things. First I will note a little about the usage plans for this. Effectively this will end up being a mountain truck, focused on being able to get up snowboarding and general street driving. There will be some camping trips and some general fire road driving but the focus will be on a simple streetable, nice driving k5.

I don't really plan on ever getting rid of it, or if I do there will always likely be another one in the family that will take on its parts so I am not overly concerned on spending more than it's worth because it will more than pay for itself in planned usage.

Near term things that are planned is replacing the steering shaft and associated rag joint with a new Borgeson Ujoint shaft, replacing the steering box and all the tie rod ends. The frame has already been beefed up with the ORD kit and the balljoints replaced a couple hundred miles ago.

Currently it has 285/70 R17 KM2s on it, and I will likely be staying with a very similar sized tire.... never really going over a 33. Tires will likely be swapped for a set of Goodyear Wranglers or potentially the BFG ATs with the primary focus being a very good, high traction snow tire but still with decent driveability and wear characteristics.

Where I could use some guidance and thoughts. I would like to replace the existing leaf springs with a high quality set of after market springs. I am not looking for lift on it (I have a very built CJ7 being finished here shortly) and am more heavily focused on a good ride quality over offroad capabilities. Who makes the best quality replacement springs? I originally was trying to contact National who custom built my CJ springs but sadly it looks like they may have went out of business. I was thinking of either Alcan or Deaver for the springs but figured I would get some thoughts. I will be replacing the bumpstops and shocks as well but will be focused on high quality stock style replacements versus going exotic with fox or something like that. Additional thoughts on where to look for springs? Cost is less of a concern for me than quality on this so I would like thoughts on the best of the best in your experiences. If you have thoughts on shocks would love to hear them as well. Bumpstops will likely just be energy suspensions or something like that.

The next question I have is around seats. I would like to update the seats in it to something very comfortable. I have been tossing around the idea of Corbeaus and even including the heated options and lumbar supports because worst case, if I ever get rid of the k5, they can be swapped into my CJ. Any other thoughts that people have on nice simple reclining seats that are focused on comfort? Planning on this getting a ton of road miles over the next years and want something comfy but that also offers the ability to still access the rear seat and my daughters car seat since she will be doing a lot of boarding with me.

The final area was one that surprised me. I was looking for the grab handles (oh S*** handles) as this one just has block off plates for them on the passenger side and on the top where they should go. This was a fleet vehicle I think so it likely never had them in it. I checked LMC and a few other places and was surprised this wasn't something that seems to be made. Can anyone advise on where to source some? If not I can make some easily enough but just would prefer something simple and bolt in.

I will eventually build a new motor for it, rebuild axles and maybe swap out for 60/14FF, as well as rebuild the tranny and tcase so it is tip top, but for now just going to drive it as everything seems to work pretty well.

Many thanks in advance for the thoughts/guidance/help.
 
I'm rebuilding my 91 right now, it runs great so not doing anything to the engine or trans but decided to go with the D60/14 route.
mine also is mostly ( 99%) daily driver, the BFG AT are great all around tires so thats what i'm going with.
as far as springs call Off Road Design and tell him what truck, what kind of driving you want and he will order your springs ( they are Alcans) but they live K5 trucks so know the setup needed better then anyone i could find.
I actually went with the Coilover for the front but thats way overkill, a custom set of springs and good shocks will make you happy. we are doing that now with a buddys K5 and he is running 33" but putting on a 4" lift
Realize that doing a little lift will probably give you a better ride since the springs wont have to have the negative arc like stock ( again call ORD and ask them)
for Seats have about Mastercraft you can use in either the blazer or Jeep
 
Thanks for the thoughts thus far. That is a good point on the negative arch and definitely something to think about. I had chatted with ORD yesterday on springs but they didn't have much insight to share about stock replacements since all that they carry are lift springs. I might chat with them again and see what they think and I called Alcan as well and they had some good thoughts. Deaver is supposed to call me back with some pricing and options as well.

Anyone have thoughts on shocks? Thinking something like Doetsch since I have had good luck with them on my cj in the past.

For the steering shaft the borgeson ones are not super expensive and I can add in a vibration dampener that should keep the road feel from getting excessive without the rag joint. I like their quality and have had good experience with them on my CJ build.

I doubt I will do mastercraft as I just don't like the feel of a suspension seat. http://corbeau.com/sport-seat.html These are more what I am leaning towards because this is more of a daily driver style vehicle.

A few other questions for folks. What columns are the same as the k5 columns from 91? I would like to swap over to one with tilt and cruise control as I plan on adding in a stop cruise control setup for road trips. Anyone have any good resources they are aware of for what all parts I would need to source to add the cruise onto a '91 that did not have it factory? I am guessing the harness is there because I think they were standard by '91 but be great if someone has experience and can confirm.

Additionally, what is the correct backspacing for the wheels on these? The current KM2s that are on it rub a bit at full lock going forward and rub a heck of a lot (I think hitting the steering arm on the knuckle, need to confirm that this weekend) when backing up and cranking the wheel. Not sure if that is simply the width of the tire and how aggressive the lugs are on the side of the KM2 (that is my suspicion) or f the wheels have incorrect back spacing which is also a possibility.

I am pretty stoked to be able to throw some money at this thing.

I am still trying to decide if I want to dynamat it or do lizard skin sound deadening. I have some dynamat extreme left from another project and also have the lizard skin gun and product sitting there that I could use......

Parts list thus far is:

Seats w/heat and lumbars
Seat brackets
Springs
ORD heavy duty shackles and greasable bushings for all mounting points
Bumpstops
Steering shaft
Sway bar bushings
Shocks
Steering box
Tierod ends
Tires and Wheels
Distributor cap and rotor
Plugs
Wires
Air cleaner
Fuel filter

Thinking that should be a pretty good starting point to get the drivability dialed in on it and just give it a slight tune up. One of these days I will likely build a new motor and drivetrain for it since they are so easy to source in general but that can hold off for a bit since it isn't meant to be a race car. I have a v8 audi if I want to drive something fast.... :)

Thanks again for all the thoughts keep them coming, love hearing others insights. If there are thoughts on other maintenance or upgrade areas I should think about definitely let me know.
 
Your build is pretty close to mine. Mine is a 91 also. Here's what I used to create some quick grab handles on mine. These are just grab handles originally for JK Jeeps by Rugged Ridge. Actually mine were knock offs from Amazon, but the Rugged Ridge are cheap enough.



Pass side roof mount in stock location, holes were already there and threaded.


I went on to add some to the A-pillars on each side. With my 4" lift I use mine everytime to get in. Saves my Tilt Column.



My K5 was a base model, no option truck too. Good for lack of added crap, but no creature comforts like tilt. We swapped in a tilt column from a 89 GMC Suburban. For swap material, stick with 87-91 Blazer/Suburban for the most direct swap. If you go earlier, the wiring may not match up. Too early and you won't have a wiper switch on the column either.

For seating, I went with buckets out of a 2002 Silverado. Fairly common swap with integrated seat belts. Very comfy in my opinon as I moved them from my old 75 to the 91. I can run a lot of road miles before I get saddle sore in these for sure. The floor needs reinforced at the mounts due to the integrated seat belts, but that is pretty easy to do.
 
Another idea
Since you have a basic truck is look around for a 89-91 suburban the things are cheap
I've found a few 3/4 tons that are pretty clean for under $3k they either have Dana 44 fronts or heavy duty 10 bolt but have the 14 rear all bolt right in
Strip the parts you want ,axles ,interior etc steering then dump the rest
 
As has been said already, a stock tilt column is easy to swap in. The cruise control I believe is an add on harness. I can't remember, but I will try to look.
As @ZooMad75 said, the 2001-2006 GM suv seats work well.
 
Also all very good replies, keep it coming. Actually did find a 91 Burb for cheap around here and that would not be a bad plan at all especially if I could poach a column and cruise components.

In folks experiences, what are the best plugs to run in these TBIs? I have a Summit order I need to do for my Jeep and I will throw some wires, cap, plugs etc into that order along with maybe some shocks and a new stabilizer since I will already get free shipping with my jeep stuff.
 

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