5-speed swap

I put an 89 5.0 mustang 5 speed in my maverick. my engine is a 66' 289. it wasnt easy, but we got everything to go together, but when i test drove it, it vibrates like crazy. i know im not the only one to ever do this so i was wondering if any one might know what my problem is or if they have any advice it would be appreciated. thanks

 

My guess is you used the 5.0 flywheel on the 289 .... Can't do that ... don't run it long or you'll ruin your engine ... the 289 is 28oz imbalance and the 5.0 is 50oz imbalance ..

 

so do i need to rebalance my flywheel, get a new one or do you know something that will interchange?

 

You need a new flywheel ... a 28oz that has the correct bolt holes for your 5.0 clutch. I have a nice one for sale ... but it's 164T ... I'm sure you need 157T ...

 

how do i know which one i need, or is there a certain year car that would interchange?

 

Nothing will interchange ... you'll need to get a billet 5.0 28oz flywheel ... they are made specifically for the swap you just made ... you can get them on ebay ... More than likely it is 157 Tooth ... count the teeth on one of the ones your removed to verify. If it is 164T ... contact me for a deal ..

 

my original flywheel was for an 11 inch clutch it was 14in"dia, and is a 164t, but the new bell housing required a 10.5 in" clutch so i had to use the mustang flywheel and bellhousing because the new tranny wouldnt bolt to the old one.

 

Yup ... you'll need to crack out the wallet and buy a 28oz 157T flywheel ... I don't think they made a 164T bellhousing for a T5 ...

 

thanks alot for all the help

 

just bought a 157T 28oz imbalance flywheel from O'Reilly's for about $100. thanks again for all your help.

 

Keep in mind that the flywheels used with a diaphram clutch are drilled differently than a long clutch like the original on your 289 ... hopefully the mount holes are correct on the Orielly's flywheel for you application. I have also seen flywheels that are drilled to except either style.

 

i just installed the 157T 28oz imbalanced flywheel on the car and its doing the exact same thing. are you sure that was the problem

 

Well .. you need the matching 28oz Damper as well ... Don't use the 50oz off the 5.0. The flywheel balance, crank balance and damper balance are a matching set. Which Harmonic Balancer/Damper are you using?

Oh ... and dang ... you work fast!

 

yeah no kidding what was that about 4 hours

 

actually it only took an hour and a half to take it out and put the new one in. i didnt change the harmonic balancer i guess O'Reilly's f'd up and gave me the wrong flywheel