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post #1 of 14 (permalink) Old 04-10-2011, 04:22 AM Thread Starter
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Strange vibration...

Okay guys, needin some help here.

I have just done the d60 swap. At the same time I changed my wheel-tire combo from stock 16s with 265/75/16 (31") to 17s with 305/70/17 (33.8ish) After initially driving home (which was smooth), I have acquired a strange vibration or shimmy that feels like the truck doesn't have enough power to push these tires. Going up a hill with no load, it slows down quite a bit unless I really push the pedal where before it didn't struggle like this. The truck currently has 3.55 in the rear and 4.10 up front (obviously not engaged).

Assuming there is nothing wrong with the trans, would changing gears help this? Or would a chip give the truck enough power to overcome this issue?

Thanks,
Scott

'97 F250 CC SB - Dana 60 Swap, 4.10s, Tymar intake, 3" DP, 5" Diamond Eye straight pipe, ISSPRO Gauges (Boost, Pyro, Trans), Tru-Cool Max trans cooler, Swamps IDM
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post #2 of 14 (permalink) Old 04-10-2011, 03:46 PM
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Re: Strange vibration...

I have read some people have had this problem and it turned out to be the stock f250 driveshaft, they swapped in a f350 drive shaft and the vibration went away.

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post #3 of 14 (permalink) Old 04-10-2011, 04:33 PM
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Re: Strange vibration...

Quote:
Originally Posted by TacticalMonk View Post
Okay guys, needin some help here.

I have just done the d60 swap. At the same time I changed my wheel-tire combo from stock 16s with 265/75/16 (31") to 17s with 305/70/17 (33.8ish) After initially driving home (which was smooth), I have acquired a strange vibration or shimmy that feels like the truck doesn't have enough power to push these tires. Going up a hill with no load, it slows down quite a bit unless I really push the pedal where before it didn't struggle like this. The truck currently has 3.55 in the rear and 4.10 up front (obviously not engaged).

Assuming there is nothing wrong with the trans, would changing gears help this? Or would a chip give the truck enough power to overcome this issue?

Thanks,
Scott
It's kinda hard to describe a "shimmy" over the internet. Scott have you checked your front calipers to see if any are dragging? Fuel filter been changed lately? With any truck increasing tire size/weight is going to make a difference on how you hold the pedal to maintain speed.

Quote:
Originally Posted by countryboyrob View Post
I have read some people have had this problem and it turned out to be the stock f250 driveshaft, they swapped in a f350 drive shaft and the vibration went away.
That would only be the case if his hubs were locked or he was in 4x4. In 2wd your front drive shaft isn't going to be spinning around. So it wouldn't matter if you had a 250 shaft, a 350 shaft, or no shaft.


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post #4 of 14 (permalink) Old 04-10-2011, 04:40 PM
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Re: Strange vibration...


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post #5 of 14 (permalink) Old 04-10-2011, 07:15 PM Thread Starter
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Re: Strange vibration...

I understand the pedal would be different with different tire size, but it seems like it shakes.

I'll try to describe it like this: when you are at a stop and you are turning so your wheels are turned already, but you're waiting on cars to pass coming from the other direction, you have a small window to get through the traffic so you have to step on it a little and it feels like the rearend shakes a little. It feels like that only all the time with varying degrees of "shimminess". Does that description help?

I will check the fuel filter because it does have a similar feel to when it's close to running out of gas. That would also explain the loss in power. Ill let you know what happens.

Scott

'97 F250 CC SB - Dana 60 Swap, 4.10s, Tymar intake, 3" DP, 5" Diamond Eye straight pipe, ISSPRO Gauges (Boost, Pyro, Trans), Tru-Cool Max trans cooler, Swamps IDM
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post #6 of 14 (permalink) Old 04-10-2011, 08:55 PM
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Re: Strange vibration...

How did you level the truck out when you installed the D60? Check your pinion angles. Might have to shim down the carrier bearing.

Also put your stock wheels back on and see what happens.

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post #7 of 14 (permalink) Old 04-10-2011, 11:17 PM Thread Starter
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Re: Strange vibration...

Quote:
Originally Posted by gnxtc2 View Post
How did you level the truck out when you installed the D60? Check your pinion angles. Might have to shim down the carrier bearing.

Also put your stock wheels back on and see what happens.

Billy T.
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I did nothing to level the truck. When I installed the d60, I also installed f350 front springs. I have a ranch hand bumper that I think brings the front back down to level. I did nothing with the rear suspension.

I have installed the fuel filter, but have not had a chance to drive it since then.

I will update in a bit.

Scott

'97 F250 CC SB - Dana 60 Swap, 4.10s, Tymar intake, 3" DP, 5" Diamond Eye straight pipe, ISSPRO Gauges (Boost, Pyro, Trans), Tru-Cool Max trans cooler, Swamps IDM
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post #8 of 14 (permalink) Old 04-11-2011, 12:06 AM
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Re: Strange vibration...

Have you rotated the tires around, front to back and/or side to side, to see if the shimmy gets better, worse, feels different, what-not?
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post #9 of 14 (permalink) Old 04-11-2011, 01:15 AM
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Re: Strange vibration...

Are your hubs locked and the axles are spinning bad u-joints?

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post #10 of 14 (permalink) Old 04-11-2011, 01:53 AM Thread Starter
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Re: Strange vibration...

Quote:
Originally Posted by madpogue View Post
Have you rotated the tires around, front to back and/or side to side, to see if the shimmy gets better, worse, feels different, what-not?
The wheels and tires are brand new within a week. The first couple of days they rode fine and then I started to feel this vibration. I would have thought the vibration would have been immediately recognizable if the tires weren't balanced correctly. I can try it, but won't be back to the shop till Tuesday.

Thanks,
Scott

'97 F250 CC SB - Dana 60 Swap, 4.10s, Tymar intake, 3" DP, 5" Diamond Eye straight pipe, ISSPRO Gauges (Boost, Pyro, Trans), Tru-Cool Max trans cooler, Swamps IDM
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