either that or cut into those pristine floors and move the tunnel up. personally i would get some TCP or RM motor mounts that will you allow to lower the engine 1" and hopefully change the angles at the trans enough to bring you closer back to specs. i find it odd that the bigger cars have less room in the tunnel than the 69/70 (possibly 67/68 as well) cars. there are tons of guys who have put the tremec in the 69/70 and had acceptable driveline angles, still not ideal mind you but within allowable tolerances.
I've been fighting the same problem on my 77 Comet after the 9" swap. First thing I did was learn the pinion shaft bearings were bad. Changed those. Same vibes. Next replaced the driveshaft with the original off the car ( I had swapped it for a larger shaft I already had,turned out it was a bit out of round) Still got vibes. Next replaced the C-4's tailshaft bushing. It had a bunch of slack. Still had vibes, only now just on decelleration. Just installed an ebay special 02 Stang driveshaft. Still got a very, very slight vibe, but not nearly as bad as it started out with. Ordered the 2.5* pinion angle shims yesterday. Gonna install them when I get from Wyoming later this week.
Did you replace the transmission tailshaft bushing ?(not bearings, but bushing) As far as the driveshaft goes, if you can jack it up off the ground to where you can run the engine with the trans in gear, then watch the shaft, if it's out of round, you'll see that. If your rearend was rebuilt, that probably rules out the pinion bearings. The chunk in mine came from a junkyard 81 Bronco, the only thing I'd checked before using it was the clutches. Wasn't till I was hunting the driveshaft vibes that I realized the pinion bearing were rough.
Is the trans tunnel completely intact? You can notch out the floor support and not cut the tunnel open. I went back and see it's a 3550, so notching the floor support may not give you enough to solve the problem.
We have been looking at these guys:
ford transmission swaps | tremec | mopar restoration parts | automatic transmission, camaro transmission
We have a customer who wants to use this setup, but have not tried them yet. Not that you want to dump your 3550 and buy another trans...but if leaving the tunnel intact 100% is the goal, this is an option. If it is what they say it is.
I notch all the T-5 conversions, and the Keisler instructions have you notch it too.
I am interested to see if anyone has dropped the motor an inch to solve this, and what compromises ensued as a result. THis seems like a no brainer, but there is almost always a trade off somewhere...
We have been looking at these guys:
ford transmission swaps | tremec | mopar restoration parts | automatic transmission, camaro transmission
We have a customer who wants to use this setup, but have not tried them yet. Not that you want to dump your 3550 and buy another trans...but if leaving the tunnel intact 100% is the goal, this is an option. If it is what they say it is.
I notch all the T-5 conversions, and the Keisler instructions have you notch it too.
I am interested to see if anyone has dropped the motor an inch to solve this, and what compromises ensued as a result. THis seems like a no brainer, but there is almost always a trade off somewhere...