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Ford-Rangers.com Ranger Forum > Ranger Engine Tech > 4 Cylinder Gasoline > 98 XLT w/ RABS, 2.5, Auto, bucking/kicking when coming to stop sometimes

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98 XLT w/ RABS, 2.5, Auto, bucking/kicking when coming to stop sometimes
 Moderated by: Mike69, MaDMaXX
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 Posted: Sun Feb 23rd, 2020 12:25 am
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wh23g3g
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Well I wasn't sure this was an engine, transmission, brake, or rear differential problem so I posted here. I've got a 98 Ranger 2.5 Automatic with 397,000 miles on the total vehicle. Occassionally but not every time when I'm coming to a stop from normal driving speed you can feel like a buck or kick slightly. It doesn't do it every stop. One time it did it last week and the brake and ABS light came on. However, when I started the engine for the next time the lights were off and hasn't come back on. I did a scan with my Forscan program and there was a GEM code for the speed sensor. This has rear abs only so I replaced it just because it was cheap. When I finally got the old one out it was in pieces. I got the new one in and it still is doing the same bucking/kicking when stopping from normal speed. The transmission shifts perfectly, never had any issue with the transmission. It's probably got 160,000 miles on it. The engine probably is still around 200,000 miles. The rear end housing has 397,000 miles. Every bearing in the rear differential has been changed about a year ago by a shop. However, the pinion seal leaks pretty bad. I've got to add fluid every 2-3 times I drive it. Luckily this isn't my primary driving vehicle.  I even had the flange changed to a brand new one but it still leaks. I think the housing is probably worn. Not sure the bucking/kicking is in the brakes. Rear brakes were fine when I had the fronts overhauled last summer.  Could it be ring and pinion? The axle guy said the teeth looked really good last year when he did the bearings. I was having them done because it was making a little noise but I think it's still making the noise. Any idea where I could start checking?



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1998 Ford Ranger XLT 2.5 4R44E Automatic - Stock
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 Posted: Sun Feb 23rd, 2020 01:18 pm
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410customs

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yes pull the speed sensor out of the rear diff and have a look see inside, there is a stator ring that bolts to the back of the ring gear that the speed sensor reads from
If your old speed sensor was in pieces then something is wrong in there
The computer already said it was a speed sensor issue, you found the old one in pieces...I would start there
You can pull the diff cover for a better look if needed.
With a camera (on your phone) you can look down in the speed sensor hole if your head does not fit
397K on a rear axle, this 4 banger has a 7.5" rear right? That is really good miles from this thing! Might be time for a carrier rebuild..........


 you can feel like a buck or kick slightly.


Is it in the brakes? A buck or kick is usually a engine miss? or a rough downshift? The downshift could be caused by funky speed sensor signal
You can try to get some live data of the speed sensor and watch what is happening during your slowing to a stop



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 Posted: Sun Feb 23rd, 2020 08:26 pm
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wh23g3g
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I can tell it's going to be hard for me to diagnose. I may have to go to my regular shop and have him ride around in it. I believe when I pulled the speed sensor everything came out piece by piece. It didn't appear to be broken up inside. It just came out in pieces maybe because it was the original one. I got the new one in no problem. I've had all the bearings in the rear end, differential bearings, axle bearings, pinion bearings, crush sleeves replaced twice not too far apart. One time because one of the pinion bearings were making a noise. The shop that did it works on a lot of 4x4's and custom axles. He said the teeth all looked really good. I asked because I thought that's what the noise from last time but he said it was just a bad bearing. Well it's a little noisy right now, maybe just a cheap bearing. I can't tell if it's differential, transmission, suspension, brakes or engine moving. It feels like something is sliding and it makes the noise of a brake grab. It doesn't do it when you take off at full throttle so I thought that ruled out the mounts being broken. I tried to see. I looked under the front end and don't see anything loose. Calipers are tight, sway bar links are good, rack is tight, control arms are tight. It's all fairly new. It also doesn't pull when you stop like if a caliper was locking up. Would the rear differential cause a clunk when you're stopping? I always thought that's what it does.



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1998 Ford Ranger XLT 2.5 4R44E Automatic - Stock
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 Posted: Sun Feb 23rd, 2020 09:05 pm
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Is this rwd or 4wd?

sounds like U joints in driveshaft
put truck in neutral
raise rear end
check driveshaft U joints, slip yoke for looseness



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 Posted: Mon Mar 23rd, 2020 01:46 pm
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mhoward
Hey look ↓ they ↓ bounce!


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You said calipers are tight.  Did you check the bolts for the caliper BRACKET?  My son's 1999 lost a bolt twice on caliper mounting brackets.  They are now lock-tited and torqued to hell and back.



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2003 Ranger Edge / Extended Cab / Flareside / 3.0L FLEX / Auto / 2WD / 8.8 Open 4:10 / Sonic Blue Pearl

So many mods... so little time...



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