Author Topic: Wobble (Read 2265 times)

Moit88RNR · « **on:** Aug 06, 2013, 06:10:26 PM »

I just did a SAS. When I drive over about 15-20mph the front shells wobble back and forth bad. I just had the tires balanced and I checked to see if the brakes were rubbing. I rebuilt the knuckles and did the IFS hub body conversion. It seems to only do it when going straight and I did not have the front D line in. Hoping its something simple I'm overlooking. Has anybody had this problem?

MRHilux87 · « **Reply #1 on:** Aug 06, 2013, 07:39:51 PM »

Most likely needs toe out. If you measure lug to lug on the front/back of the front two tires, the front of the tire measurment should be like 1/16 or so More than the rear. Make sense?

OOPS · « **Reply #2 on:** Aug 06, 2013, 08:22:29 PM »

What is your castor set at?

What did you set the pre-load at on the trunion bearings (knuckle bearings) at?

How long are the front shackles from bolt hole to bolt hole?

How much drop on the front hanger?

What size tires, height and width?

Are your u-bolts tight?

Are the spring bolts tight?

Are the spring center pins tight?

There are a lot of things that can cause "death wobble".

Moit88RNR · « **Reply #3 on:** Aug 08, 2013, 06:35:40 PM »

Quote from: MRHilux87 on Aug 06, 2013, 07:39:51 PM

Most likely needs toe out. If you measure lug to lug on the front/back of the front two tires, the front of the tire measurment should be like 1/16 or so More than the rear. Make sense?

i set my toe in 1/8". i didnt think it should be set out. i guess ill try that in the morning.

Quote from: OOPS on Aug 06, 2013, 08:22:29 PM

What is your castor set at?

What did you set the pre-load at on the trunion bearings (knuckle bearings) at?

How long are the front shackles from bolt hole to bolt hole?

How much drop on the front hanger?

What size tires, height and width?

Are your u-bolts tight?

Are the spring bolts tight?

Are the spring center pins tight?

There are a lot of things that can cause "death wobble".

i didnt have a pull scale to set pre load. i just reused the same size shims that were there

im running 37x12.50r15 MTRs

i will recheck all bolts. i didnt think about the spring center pin.

i know a lot of things cause death wobble. but does it usually happen at only 15 mph. I'll add more info after i check everything tomorrow.
thanks for the replies

HogCanyonHopper · « **Reply #4 on:** Aug 09, 2013, 04:26:40 PM »

might be a good idea to get a fish scale (cheap ones work) and check your steering pre-load.

Moit88RNR · « **Reply #5 on:** Aug 09, 2013, 04:52:26 PM »

ill do that for sure if i dont figure it out soon. time for another test drive

OOPS · « **Reply #6 on:** Aug 09, 2013, 04:57:18 PM »

Like HCH said, get a pull scale, you can pick them up cheap at Wal-Mart in the fishing department. If you put new bearings and races in, you need to re-check the pull pounds.

andeze · « **Reply #7 on:** Aug 09, 2013, 05:07:16 PM »

start with the obvious.
Did you use a sas kit, if not you may have a caster issue.
break out the tape measure check rough alignment, and square of front axle to rear axle
put the back tires on the front, see if you got a poorly balanced tires,
tightness of shackles and bolts.
Toe out helps but to me it is tiring to drive that way cuz you are constantly correcting.

Moit88RNR · « **Reply #8 on:** Aug 23, 2013, 11:11:24 AM »

Well toe out solved my problem. Thanks for the advise. Hope it's not enought to cause my tires to wear weird.

Author Topic: Wobble (Read 2265 times)

Moit88RNR

Wobble

MRHilux87

Re: Wobble

OOPS

Re: Wobble

Moit88RNR [OP]

Re: Wobble

HogCanyonHopper

Re: Wobble

Moit88RNR [OP]

Re: Wobble

OOPS

Re: Wobble

andeze

Re: Wobble

Moit88RNR [OP]

Re: Wobble

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	Author Topic: Wobble (Read 2265 times) 0 Members and 2 Guests are viewing this topic. Moit88RNR Rock Master Turtle Points: 39 Posts: 360 Member since Jun '08 Wobble « on: Aug 06, 2013, 06:10:26 PM » I just did a SAS. When I drive over about 15-20mph the front shells wobble back and forth bad. I just had the tires balanced and I checked to see if the brakes were rubbing. I rebuilt the knuckles and did the IFS hub body conversion. It seems to only do it when going straight and I did not have the front D line in. Hoping its something simple I'm overlooking. Has anybody had this problem? Logged MRHilux87 Crawler Guru Turtle Points: -306 Posts: 424 Member since Apr '11 Re: Wobble « Reply #1 on: Aug 06, 2013, 07:39:51 PM » Most likely needs toe out. If you measure lug to lug on the front/back of the front two tires, the front of the tire measurment should be like 1/16 or so More than the rear. Make sense? Logged 1987 4Runner. 3RZ. SAS Duals 5.29 Elocker Rear Detroit front 35s... Hydro assist 2007 Cummins 6.7 DRW g56. deleted EFI live. 2013 Ninja 1000 SOLD: 2006 Mitsibishi EVO 9. 347WHP runs 12.2s - Wifes daily driver. Ducati 916 - track bike. OOPS The 2.5K Group Turtle Points: 1304 Posts: 2,561 Member since May '02 Re: Wobble « Reply #2 on: Aug 06, 2013, 08:22:29 PM » What is your castor set at? What did you set the pre-load at on the trunion bearings (knuckle bearings) at? How long are the front shackles from bolt hole to bolt hole? How much drop on the front hanger? What size tires, height and width? Are your u-bolts tight? Are the spring bolts tight? Are the spring center pins tight? There are a lot of things that can cause "death wobble". Logged David & Theresa Fritzsche, 1990 Ex-Cab with a few mods!!!!!!!!! Roseville, CA Sobriety =Serenity Moit88RNR [OP] Rock Master Turtle Points: 39 Posts: 360 Member since Jun '08 Re: Wobble « Reply #3 on: Aug 08, 2013, 06:35:40 PM » Quote from: MRHilux87 on Aug 06, 2013, 07:39:51 PM Most likely needs toe out. If you measure lug to lug on the front/back of the front two tires, the front of the tire measurment should be like 1/16 or so More than the rear. Make sense? i set my toe in 1/8". i didnt think it should be set out. i guess ill try that in the morning. Quote from: OOPS on Aug 06, 2013, 08:22:29 PM What is your castor set at? What did you set the pre-load at on the trunion bearings (knuckle bearings) at? How long are the front shackles from bolt hole to bolt hole? How much drop on the front hanger? What size tires, height and width? Are your u-bolts tight? Are the spring bolts tight? Are the spring center pins tight? There are a lot of things that can cause "death wobble". i didnt have a pull scale to set pre load. i just reused the same size shims that were there im running 37x12.50r15 MTRs i will recheck all bolts. i didnt think about the spring center pin. i know a lot of things cause death wobble. but does it usually happen at only 15 mph. I'll add more info after i check everything tomorrow. thanks for the replies Logged HogCanyonHopper The 1K Club Turtle Points: 7319 Posts: 1,224 Member since Jul '10 Re: Wobble « Reply #4 on: Aug 09, 2013, 04:26:40 PM » might be a good idea to get a fish scale (cheap ones work) and check your steering pre-load. Logged http://board.marlincrawler.com/index.php?topic=88478.0 Where are we going? And why are we in a handbasket? My friend is goin to moan this weekend - RockcrawlinJK Moit88RNR [OP] Rock Master Turtle Points: 39 Posts: 360 Member since Jun '08 Re: Wobble « Reply #5 on: Aug 09, 2013, 04:52:26 PM » ill do that for sure if i dont figure it out soon. time for another test drive Logged OOPS The 2.5K Group Turtle Points: 1304 Posts: 2,561 Member since May '02 Re: Wobble « Reply #6 on: Aug 09, 2013, 04:57:18 PM » Like HCH said, get a pull scale, you can pick them up cheap at Wal-Mart in the fishing department. If you put new bearings and races in, you need to re-check the pull pounds. Logged David & Theresa Fritzsche, 1990 Ex-Cab with a few mods!!!!!!!!! Roseville, CA Sobriety =Serenity andeze Rock Crawl'n Turtle Points: -1 Posts: 51 Member since Jun '11 Re: Wobble « Reply #7 on: Aug 09, 2013, 05:07:16 PM » start with the obvious. Did you use a sas kit, if not you may have a caster issue. break out the tape measure check rough alignment, and square of front axle to rear axle put the back tires on the front, see if you got a poorly balanced tires, tightness of shackles and bolts. Toe out helps but to me it is tiring to drive that way cuz you are constantly correcting. Logged Moit88RNR [OP] Rock Master Turtle Points: 39 Posts: 360 Member since Jun '08 Re: Wobble « Reply #8 on: Aug 23, 2013, 11:11:24 AM » Well toe out solved my problem. Thanks for the advise. Hope it's not enought to cause my tires to wear weird. Logged