hopping, jerking when turning on wet pavement

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aribert
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hopping, jerking when turning on wet pavement

Post #1 by aribert » Thu Jun 27, 2013 7:49 am

Greetings all:

Its raining here again today and that has me driving my F150. When I stop at an intersection launch and simultaneously make a turn, I get some loss of traction. The result is jerky launch - the driveline is winding and unwinding - the shift lever is rocking back and forth. This has annoyed me for the past 4 year that I have owned this vehicle. Occasionally it pisses me off and I hold the accelerator down, letting it oscillate (jerk) longer instead of lifting - I have not broken anything yet.

I am NOT dropping the clutch - I am releasing it smoothly and slowly. My truck has the more fuel efficient but miserable 2.something rear axle ratio. I would imagine it to be worse if I had a 3.xx rear axle ratio. I have never had this condition in any other rear wheel drive. Usually if one breaks traction the back end steps out a bit - the F150 never does. This does not appear to be tire related. I bought the truck w/ some house brand mystery tires. A couple of years ago I moved the Goodrich Longtrails from my winter ride over to the P/U. No observable difference with the change in tires.

Do you experience the same in your truck? How do you minimize this?
61 , Deluxe trim & original 54 yr old factory padded dash. Custom interior, stock color base/clear, 275K mi, My car for the last 47 years (OK, first decade "ownership" from the left rear seat). '78 200, 3.03 manual trans, '73 dist w/ points & TFI ign, Weber32/36, 15 wheels Image

91 F150 4.9 almost stock

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StrangeRanger
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Re: hopping, jerking when turning on wet pavement

Post #2 by StrangeRanger » Thu Jun 27, 2013 3:59 pm

Do you have an open diff or a limited slip?
1996 F-150 (tow missile)
1993 Mustang 5.0 (hot rod and auto-x monster)
1982 Tiga Formula Ford (SCCA racecar)
2013 Hyundai Elantra Coupe (daily driver)

aribert
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Re: hopping, jerking when turning on wet pavement

Post #3 by aribert » Sun Jun 30, 2013 10:57 pm

I don't know, I never even thought about that - I took for granted that the vehicle had an open diff. Other than the Ranger XLT badging (and the carpet and door trim panels w/ map pockets), its truly a base vehicle. I will need to go and check it out. Thanks for asking the question. I'll be a couple of days before I can get to that & report back.
61 , Deluxe trim & original 54 yr old factory padded dash. Custom interior, stock color base/clear, 275K mi, My car for the last 47 years (OK, first decade "ownership" from the left rear seat). '78 200, 3.03 manual trans, '73 dist w/ points & TFI ign, Weber32/36, 15 wheels Image

91 F150 4.9 almost stock

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bubba22349
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Re: hopping, jerking when turning on wet pavement

Post #4 by bubba22349 » Mon Jul 01, 2013 2:07 am

Mine is a 94 F150 has the 5 speed (Masdog) trans with a 3:08 gear. Are your motor and trans mounts still in good condition?
A bad day Drag Racing is still better than a good day at work!

I am still hunting for a project car to build but with my current low budget it's not looking so good. My Ex- Fleet of Sixes these are all long gone! :bang: 1954 Customline 223 3 speed with O/D, 1963 Fairlane project drag car with BB6, 1977 Maverick 250 with C4, 1994 F-150 a 300 with 5 speed.

aribert
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Re: hopping, jerking when turning on wet pavement

Post #5 by aribert » Mon Jul 01, 2013 9:51 am

I'll look into that also when I check to see if it is an open diff or not.

I checked the mounts 3+ years ago, shortly after I bought it and I ended up replacing the (from memory) LH motor mount - the one that is in tension when motor torque is applied. The other two were good at the time.
61 , Deluxe trim & original 54 yr old factory padded dash. Custom interior, stock color base/clear, 275K mi, My car for the last 47 years (OK, first decade "ownership" from the left rear seat). '78 200, 3.03 manual trans, '73 dist w/ points & TFI ign, Weber32/36, 15 wheels Image

91 F150 4.9 almost stock

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StrangeRanger
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Re: hopping, jerking when turning on wet pavement

Post #6 by StrangeRanger » Mon Jul 01, 2013 7:56 pm

There's always a chance that a previous owner gave it a Lincoln Locker :nono: but that would probably behave badly on dry pavement as well as wet.
1996 F-150 (tow missile)
1993 Mustang 5.0 (hot rod and auto-x monster)
1982 Tiga Formula Ford (SCCA racecar)
2013 Hyundai Elantra Coupe (daily driver)

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80broncoman
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Re: hopping, jerking when turning on wet pavement

Post #7 by 80broncoman » Mon Jul 01, 2013 9:41 pm

I think you are spinning one tire and its wheel hop.
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Re: hopping, jerking when turning on wet pavement

Post #8 by BIG 6 farmer » Sun Jul 07, 2013 1:04 am

X2 on the wheel hop. You would be surprised how much rear leaf springs can flex, causing your pinion angle to go up & down too much. I have slapper bars on my 91 F 150, Mazda 5 speed, 3.55 posi, 300Hp 302 V8. Really need them just for daily driving. If i didnt have them, i would have the same problem. :nod:
83 F 150 SB 4x4 300 six NP 4speed - 89 F 150 300 six Turbo (in works) - 1950 IHC L162 (1&1/2 ton?) - 87 & 88 T-Bird Turbo Coupes - 2000 Triumph Tiger , 76 Honda GL 1000 , & other toys and parts (& junk) - My Gal ? Shes gone... New rule, keep the old junk. Trade the women in as needed !!!

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Re: hopping, jerking when turning on wet pavement

Post #9 by aribert » Sun Jul 07, 2013 12:23 pm

All:

Thanks for the replies.

It is definitely an open diff. I checked the motor and trans mounts and they are still good.

I'll look into the "slapper bars". I am unfamiliar with them. I suspect that I have seen them on muscle cars but since I am not into drag racing, I just never paid close attention. Based on some catalog shopping there appear to be 3 different rear leaf springs that were available on the F150 for '91. I suspect that I have the softest set of reat leaf springs (I had no problem bottoming the frame /rubber bumpers out on the rear axle when moving a load of dirt) since the rest of the truck was pretty much set up as a commuter vehicle with the 2.xx rear axle ratio.
61 , Deluxe trim & original 54 yr old factory padded dash. Custom interior, stock color base/clear, 275K mi, My car for the last 47 years (OK, first decade "ownership" from the left rear seat). '78 200, 3.03 manual trans, '73 dist w/ points & TFI ign, Weber32/36, 15 wheels Image

91 F150 4.9 almost stock

BIG 6 farmer
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Location: On a dirt road near Washington Nebr.

Re: hopping, jerking when turning on wet pavement

Post #10 by BIG 6 farmer » Sun Jul 07, 2013 2:35 pm

Think i got mine from Summit Racing, or Jegs. There are other bolt on Traction aids, but im sure a set of bolt on slapper bars gonna be the least cash.
83 F 150 SB 4x4 300 six NP 4speed - 89 F 150 300 six Turbo (in works) - 1950 IHC L162 (1&1/2 ton?) - 87 & 88 T-Bird Turbo Coupes - 2000 Triumph Tiger , 76 Honda GL 1000 , & other toys and parts (& junk) - My Gal ? Shes gone... New rule, keep the old junk. Trade the women in as needed !!!

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StrangeRanger
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Re: hopping, jerking when turning on wet pavement

Post #11 by StrangeRanger » Sun Jul 07, 2013 5:49 pm

If you buy slappers make sure they are compatible with axle under spring. Most are for axle over spring.
1996 F-150 (tow missile)
1993 Mustang 5.0 (hot rod and auto-x monster)
1982 Tiga Formula Ford (SCCA racecar)
2013 Hyundai Elantra Coupe (daily driver)

BIG 6 farmer
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Posts: 309
Joined: Sun Dec 30, 2012 12:46 am
Location: On a dirt road near Washington Nebr.

Re: hopping, jerking when turning on wet pavement

Post #12 by BIG 6 farmer » Tue Jul 09, 2013 5:19 am

YES, on that. Mine were listed for a Ford Truck. If you get some, make sure when mounted the Rubber snubbers have the correct clearance. No more than an inch & a half ? from bottom of Leaf Spring. Or they wont do any good.
83 F 150 SB 4x4 300 six NP 4speed - 89 F 150 300 six Turbo (in works) - 1950 IHC L162 (1&1/2 ton?) - 87 & 88 T-Bird Turbo Coupes - 2000 Triumph Tiger , 76 Honda GL 1000 , & other toys and parts (& junk) - My Gal ? Shes gone... New rule, keep the old junk. Trade the women in as needed !!!

aribert
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Re: hopping, jerking when turning on wet pavement

Post #13 by aribert » Sat Jan 24, 2015 10:14 pm

Greetings all:

I figured that I would post an update. In April I added an extra leaf - I went to my local pick & pull yard and took the second longest leaf out of a set of springs. Before installing them I cut about 2 inches off of the ends so that there was a bit of stagger between the ends of the existing leafs and the new leaf - I did not want a stiff spot in the leaf pack where the spring might fatigue and break. The results are that the extra leaf: 1. raised the back of the truck up about 3/4 of an inch 2. is not noticeable while driving (did not make the rear end feel stiffer - but I think that my truck was configured with the weakest of the 3 spring sets used on a '91 F150 2wd) and 3. greatly improved the wheel hop issue. I suspect that I could count all wheel hop events since installing the extra leaf using both hands and still have a few fingers left over. If I were to do this mod over again, I would have used a pair of main leafs (as the new leaf) and cut the eyes off - this would have resulted in a new leaf that would have ended up as the #2 leaf instead of the #3 leaf in the pack.
61 , Deluxe trim & original 54 yr old factory padded dash. Custom interior, stock color base/clear, 275K mi, My car for the last 47 years (OK, first decade "ownership" from the left rear seat). '78 200, 3.03 manual trans, '73 dist w/ points & TFI ign, Weber32/36, 15 wheels Image

91 F150 4.9 almost stock

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