It says they are a direct fit for all fieros with the 2.5. On a related note i have read that poly on a 2.5 auto may make my teeth fall out anybody run poly on theirs?
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08:45 AM
PFF
System Bot
fieroguru Member
Posts: 12128 From: Champaign, IL Registered: Aug 2003
I can't link to ebay from this computer, but having just purchased some poly bushings listed for the stock 88 2.5 dogbone - buyer beware.
The inside surface of the stock dogbone is not a uniform circular tube that you can just slide a normal round poly bushing into. The inner surface is tapered and it also has an inner lip. To get mine to fit, I had to put them in the lathe and turn the needed taper into the bushings. Once I did that, I was able to install them.
Poly dogbone alone will not make the drivetrain stiff enough to be harsh ride. Now if you had poly engine mounts, tranny mounts, control arm bushings AND dog bone, that would be different.
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11:14 AM
fieroguru Member
Posts: 12128 From: Champaign, IL Registered: Aug 2003
I have an 88 2.5 with the force balancer, so the change in vibrations to the chassis were minimal, but there was an increase (my side mirrors now vibrate at idle). Everything smooths out when you get the RPM's up and start moving.
Mine is also an 88 2.5. Of course i notice that i seem to have severe converter shudder between 35-40 under mild throttle/cruising. I imagine the poly would make that a little more unpleasant
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11:36 AM
fieroguru Member
Posts: 12128 From: Champaign, IL Registered: Aug 2003
Mine is also an 88 2.5. Of course i notice that i seem to have severe converter shudder between 35-40 under mild throttle/cruising. I imagine the poly would make that a little more unpleasant
That is the speed range at which the TCC locks up. It is best to either stay above, or below the lock up point so it isn't locking/unlocking all the time. You will notice quite a bit more firmness during the shifts and when you let of the gas as the driveline can't rock back & forth during these transitions. To me it makes the car feel more sportier... but isn't.
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11:50 AM
crashyoung Member
Posts: 1333 From: Lowell, Michigan, USA Registered: May 2012
Need an old style dog bone. New style need to mod the bushings. See my cave, torque strut in 4cyl engine section.
86(.5) and up w/ auto trans will vibrate more but better to stop breaking parts because mount setup really sucks.
------------------ Dr. Ian Malcolm: Yeah, but your scientists were so preoccupied with whether or not they could, they didn't stop to think if they should. (Jurassic Park)
I believe that 84-86 old style dog bones ( 4's and V6 engines) have a opening that you can just fit the prothane bushings into without machining. The newer style of dogbones have a sizable ridge that will need to be machined out.
------------------ " THE BLACK PARALYZER" -87GT 3800SC Series III engine, custom ZZP /Frozen Boost Intercooler setup, 3.4" Pulley, Powerlog manifold, Northstar TB, LS1 MAF, 3" Flotech Afterburner Exhaust, Autolite 104's, MSD wires, Custom CAI, 4T65eHD w. custom axles, HP Tuners VCM Suite. "THE COLUSSUS" 87GT - ALL OUT 3.4L Turbocharged engine, Garrett Hybrid Turbo, MSD ign., modified TH125H " ON THE LOOSE WITHOUT THE JUICE "
