King Cab Q's from a Newbie to the site

[Dan1028]

Hi all,

I've had my King Cab since I purchased it roughly 12+ years ago brand new. I hadn't used it for roughly the past 7 years, and recently I replaced the Futaba radio and mech. speed controller with an ESC and JR radio. I'm running with the stock Mabuchi 540 and a 1500mAh 6-cell.

One question, though. I'm not prepared to run this car into the ground (nor do I want to) for obvious reasons, but chiefly b/c of sentimental value. I would, however like it to be in fully functional condition.

That said, I have noticed that at full-throttle take-offs (from stop), it sounds like something is slipping in the tranny. I was wondering how to go about this problem. It also occurs if the truck is in tough-to-travel terrain, and instead of the wheels breaking loose or motor stalling, it just sits there and whines (which worries me).

Also, I purchased new suspension fluid, but I think it would be a wise decision to replace the springs, too. Where might I be able to pick new ones up from (anything I should be aware of here?)?

Thanks a bunch,

Dan Birenbaum

[Zericon]

The King Cab Can be a great runner, however, I've had my share of problems from the Tranny. The diff does seem to loosen up no matter how tight I made it. Some have had less problems from it, but i couldn't keep it running. I replaced the Tranny With a Leathal Weapon 2 tranny, not much on the Vintage but it still runs []

I Originally Ran the Cab on Pavment only, to get the right adjusments I put Losi Shock on with very heavy oil. I'm Actually Thinking about Putting Current Losi Shocks on (Threaded shock bodys) But I dunno, it may be ready to be a shelf Queen.

[]

[BalmyBaldwin]

Basically, things to look for are: any loose screws that tighten the gear case - these can cause shafts in the gearbox to move around.

Open the gear case and inspect your gears closely, if there is any excessive wear, the teath will be noticably thin and pointy (or in extreme cases teeth maybe missing altogther)

Check the tightness of the differencial to make sure it is not slipping. if this is the problem, try re-tightening it with a tiny bit of thread lock on hte adjustment screw...

Hope this helps

[mud4fun]

Hi Dan,

I had a similar thing on two of my cars, an FF01 chassis and a blackfoot. In both cases under hard acceleration it would appear to slip. After stripping both gearboxes I could see nothing wrong, gears were perfect and diffs tight etc. However, I notice that Tamiya redesigned both gearboxes in later models, very clear on the super blackfoot/king blackfoot compared to my original blackfoot. I never experienced this problem when using the old mechanical speed controller but only with a new ESC (Novak Rooster), maybe the power output thru the ESC is much greater than the original controller thus putting strain on transmission????

The FF01 was mysteriously cured after fitting new ball bearings throughout and a new 17T motor - don't see how this could have cured the problem though??

Ian

[wldnas]

Thats an Easy one to answer.... sounds like the Ball diff has gone slack :S

one of the major drawbcaks of Ball diffs, is that as they wear they become slack and start to slip, a dead easy way to check if the diff is dodgy, lift the back of the car up and turn one of the rear wheels, does the other wheel turn? does it feel loose or slack at all, next job is to hold one back wheel then turn the other, you should hear the motor turning, if the diff is correctly adjusted, again checak for slack, the perfect diff adjustment is one where there is just a little bit of resistence, but just to be safe all wyas adjust then to be tight, as they wear in they will be come loose again.

to ultimate test to see if your diff is slipping, put the car on the ground and press down on the rear end to stop the wheels spinning then try to trive the car forward, if the diff is slipping you will hear the gears whirring away, in it's tight then the truck will try to move and spin the rear wheels.

on looking through the manual (PAGE 9) I can see that the diff is a self contained unit and adjusting it will be next to impossible unliss you have some shimming washers, it's quite possible that the diff was assembled dry with no grease and as a result the ball have worn out premeturly, I suggest removing the diff and checking to see if its OK (Make sure you don't loose any of the small balls) getting at the diff is actually quite easy, as there is a small cover underneith which you can remove with 3 screws and after the dogbones and Drive cups are with drawn the diff can be pulled out, then it's 3 allen bolts on one side and the diff housing can be removed to reveal the balls,

Inside each housing are a number of special washers and some thrust bearing races, Chech for play, shim as nessasary then repack with Ball Diff Grease (If you have some) then reassemble, hopefully providing the diff isn't too badly worn that should cure your little slippage problem

[urban warrior]

Hi,

I totally agree to wldnas. I had a similar problem, I blew the ball diff spur gear, due to too much slack, it generated enough heat to melt the spur down. Check your diff before it is too late! At least I replaced my original diff against a Thorpe ball diff, that I had been offered by chance.

Martin

[DerAlex]

I bought my Toyota Monster Racer (similar to King Cab) years ago when I was a kid.

Since last year I started using it as a runner.

Now it is dead because of the diff. After so many years of fun.

Anybody got a diff to sell or has an idea whrer I can buy a new dif. I think in the past I have seen ads for better diffs in an american magazine [?] It is a shame that I can't drive this car just because of a small diff.

I am also thinking about buying a Stampede Truck because I can't get my Toyota running again. I neeeeeeed a truck [8)]

[Zericon]

quote:Originally posted by DerAlex

Anybody got a diff to sell or has an idea whrer I can buy a new dif. I think in the past I have seen ads for better diffs in an american magazine [?] It is a shame that I can't drive this car just because of a small diff.

I am also thinking about buying a Stampede Truck because I can't get my Toyota running again. I neeeeeeed a truck [8)]

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id="quote">id="quote">

To Make A purely Runner i would suggest www.factoryworks.com They Used to be known as A&L Manufaturing, they still make a belt drive tranny for the king cab/toyota monster racer. It's kinda pricey, around 100-US dollars. I have one and love it, no diff or gear problems what so ever!

[wudnme]

I have this same problem with a diff in a king cab. After reading this post I took mine apart for inspection. Mine appears to have stripped the splines on the axles which slide into the diff. can these be found or permantently mated together.

[netsmithUK]

I think we still have the ball diff parts in the shop, if not I think have some in my personal stash. That said the first thing to try is just turning all the washers over. Sounds simple but it worked for me Even the slightest grove worn into one of the washers that the balls sit on can make it slip too easy - by turning it over (if its not been done already) you have a nice surface for them to press against again.

Chris

[Dan1028]

Thanks all,

I'm likely going to open her up this weekend when I have more time to screw things up. But so far, so good. In fact, today I bought myself some Pro-Line Striker II 2.2's, since I don't want to destroy the truck anymore than I had years ago. So the plan is to keep it on road, and only light off-road/jumps, nothing serious. Parts are hard to come by, which leads me to ask how I might be able to acquire more? I've checked parts listing, but I'd really love to rebuild the tranny with new/better parts.

Cheers,

Dan

[wudnme]

will the manta ray ball diff set #53070 work on a king cab

[Dan1028]

I disassembled the transmission yesterday with the exception of the differential. I'm having lots of problems getting the two shafts (that slide into it) out. I didn't see anything holding them in either on my truck or in the manual. Are they self locking? Without removing those, I don't see how I can get to the diff. Any suggestions? This gearbox has not been opened up for at least 7 years, which may be part of the problem.

Thanks again,

Dan

[Dan1028]

^^bump